阅读说明：本技术 一种岩棉及其制备方法和制备装置 (Rock wool and preparation method and preparation device thereof ) 是由 陈开斌 刘建军 尹大伟 曹柏林 黎应和 孙丽贞 罗钟生 王珣 杜婷婷 刘彤 崔梦 于 2021-09-03 设计创作，主要内容包括：本发明特别涉及一种岩棉及其制备方法和制备装置,属于收尘粉综合利用技术领域,方法包括：将石墨化炉收尘粉、白云石、玄武岩、废瓷片和回料进行混合,获得第一混合物；将焦炭和所述第一混合物混合,获得第二混合物；将第二混合物进行预热,获得预热混合物；将所述预热混合物进行加热,获得热熔体；将所述热熔体进行离心成纤,获得纤维；将所述纤维进行集棉收集,获得初棉层；将所述初棉层进行铺棉,获得棉毡；将所述棉毡进行固化切割,获得岩棉；以石墨化炉收尘粉为原料来制备岩棉,解决了石墨化炉产生固体废弃物收尘粉的堆存难处置的难题。利于解决石墨化炉产生的污染问题；达到了资源综合利用的目的。(The invention particularly relates to rock wool and a preparation method and a preparation device thereof, belonging to the technical field of comprehensive utilization of dust collecting powder, wherein the method comprises the following steps: mixing the dust collecting powder, dolomite, basalt, waste ceramic chips and return materials of the graphitization furnace to obtain a first mixture; mixing coke with the first mixture to obtain a second mixture; preheating the second mixture to obtain a preheated mixture; heating the preheated mixture to obtain a hot melt; centrifuging the hot melt to form fibers to obtain fibers; collecting cotton from the fibers to obtain a primary cotton layer; paving cotton on the primary cotton layer to obtain a cotton felt; curing and cutting the cotton felt to obtain rock wool; the method for preparing the rock wool by using the dust-collecting powder of the graphitization furnace as the raw material solves the problem that the dust-collecting powder of solid wastes generated by the graphitization furnace is difficult to store and dispose. The pollution problem generated by the graphitization furnace is favorably solved; the purpose of comprehensive utilization of resources is achieved.)

1. A preparation method of rock wool is characterized by comprising the following steps:

mixing the dust collecting powder, dolomite, basalt, waste ceramic chips and return materials of the graphitization furnace to obtain a first mixture;

mixing coke with the first mixture to obtain a second mixture;

preheating the second mixture to obtain a preheated mixture;

heating the preheated mixture to obtain a hot melt;

centrifuging the hot melt to form fibers to obtain fibers;

collecting cotton from the fibers to obtain a primary cotton layer;

paving cotton on the primary cotton layer to obtain a cotton felt;

curing and cutting the cotton felt to obtain rock wool;

wherein the first mixture comprises the following components in parts by mass: 90-110 parts of dust collecting powder of a graphitization furnace, 140 parts of dolomite, 350 parts of basalt, 160 parts of waste ceramic chips and 90-110 parts of return materials; the return materials comprise leftover materials of the rock wool and the rock wool which cannot form a fixed shape.

2. The method for preparing rock wool according to claim 1, wherein the particle size of the first mixture is 1mm to 5 mm.

3. The method for preparing rock wool according to claim 1, wherein the amount of the coke is 140-160 parts by weight, and the particle size of the coke is 5mm-8 mm.

4. The method for preparing rock wool according to claim 1, wherein the temperature of the preheated mixture is 450-550 ℃.

5. The method of producing rock wool according to claim 1, wherein the temperature of the hot melt is > 1500 ℃.

6. The method for preparing rock wool according to claim 1, wherein the centrifugal speed of centrifugal fibre-forming is greater than 7000 r/min.

7. The method of manufacturing rock wool according to claim 1 wherein said fibers include a binder, said binder including a phenolic resin material.

8. The method for preparing rock wool according to claim 1, wherein the curing temperature of the curing cutting is 220-250 ℃.

9. A rock wool, characterized in that it is produced by the method of any one of claims 1 to 8.

10. A preparation facilities of rock wool, its characterized in that, the device includes:

the mixing unit is used for mixing the dust collecting powder, dolomite, basalt, waste ceramic sheets and return materials of the graphitization furnace to obtain a first mixture and mixing the coke and the first mixture to obtain a second mixture;

the preheating unit is used for preheating the second mixture to obtain a preheated mixture; the preheating unit is communicated with the mixing unit and is used for receiving the second mixture;

the heating unit is used for heating the preheated mixture to obtain a hot melt; the heating unit is communicated with the preheating unit and is used for receiving the preheated mixture;

the fiber forming unit is used for centrifugally forming the hot melt into fibers to obtain fibers; the fiber forming unit comprises a centrifugal unit, a blowing unit and a fiber forming chamber, wherein the centrifugal unit is communicated with the fiber forming chamber and is used for sending fibers formed by centrifugation into the fiber forming chamber; the blowing unit is communicated with the fiber forming chamber and is used for blowing the bonding agent into the fiber forming chamber;

the cotton collecting unit is used for collecting cotton from the fibers to obtain a primary cotton layer, and the cotton collecting unit is communicated with the fiber forming chamber and used for receiving the fibers;

the cotton paving unit is used for paving cotton on the primary cotton layer to obtain a cotton felt; the cotton spreading unit is communicated with the cotton collecting unit and is used for receiving the primary cotton layer;

the curing and cutting unit is used for curing and cutting the cotton felt to obtain rock wool; the curing and cutting unit is communicated with the cotton paving unit and is used for receiving the cotton felt.

Technical Field

The invention belongs to the technical field of comprehensive utilization of dust collecting powder, and particularly relates to rock wool and a preparation method and a preparation device thereof.

Background

The rock wool has the characteristics of light weight, small heat conductivity coefficient, no combustion, moth prevention, low price, corrosion resistance, good chemical stability, good sound absorption performance and the like, so the rock wool is widely applied to the aspects of filling heat insulation, sound absorption, sound insulation of buildings, cold insulation of oxygen generators and refrigeration houses, filling heat insulation of various thermal equipment and the like. Rock wool has been put into industrial production since the 30 th of the 20 th century and is the heat-insulating material with the widest application range in the world at present. Rock wool is called the fifth conventional energy source in foreign countries, and the material is most widely applied to buildings. Rock wool is defined in the national standard: one type of mineral wool, made primarily from fused natural igneous rock, is known as rockwool.

Most of the existing rock wool production processes use natural rocks such as basalt and dolomite as basic raw materials, and silica, dolomite and the like as auxiliary materials to adjust the acidity coefficient, and then a certain amount of coke is added to be melted and uniformly mixed in a cupola furnace, and the mixture is melted and centrifugally blown into inorganic fiber at high temperature, and a four-roller centrifuge system is used for preparing the finished wool. For example: the Chinese patent application CN111253075A relates to a rock wool product and a preparation method thereof. 450 parts of basalt 350-containing material, 80-120 parts of slag, 150 parts of cement 100-containing material, 300 parts of waste cotton slag block 200-containing material, 20-50 parts of sodium silicate, 10-30 parts of glass fiber and 50-70 parts of phenolic resin are respectively crushed and then sieved by a 50-mesh sieve, and the crushed materials are uniformly mixed with cement in a mixer, and then are heated and melted by a solute furnace, and are thrown by a high-speed centrifugal machine and collected by a cotton collector. After cotton is distributed by a pendulum machine and is pleated by a pleating machine, sodium silicate, glass fiber and phenolic resin are added, and the rock wool product is obtained by automatic packaging after pressurization by a pressurizing machine, curing by a curing furnace and cutting by a flying saw; the Chinese patent application CN 108585468A discloses a method for preparing rock wool by taking silicon tailings as raw materials, belonging to the technical field of new materials. The method is characterized in that the silicon tailings are used as main raw materials, the components are adjusted by adding raw materials such as high-temperature iron-making water slag at about 1200 ℃, the raw materials are heated and uniformly mixed by means of an intermediate high-temperature furnace, the mixture is put into rock wool equipment, rock wool fibers are prepared under the action of a centrifugal machine, urea-formaldehyde resin aqueous solution is uniformly sprayed on the surfaces of the fibers after the rock wool fibers are blown into a cotton collecting machine, and the product rock wool is prepared according to a rock wool production process.

The applicant finds in the course of the invention that: in the process of producing the carbon material by the graphitization furnace, elements such as sulfur, silicon, partial carbon and the like which are impurities are subjected to complex high-temperature reaction to generate a dust collection powder mixture which is recovered by a high-temperature flue gas recovery system, the main components of the dust collection powder are sodium sulfate, silicon dioxide, aluminum oxide and a small amount of other substances, about 15kg of dust collection powder is generated when 1 ton of carbon material is produced, and the dust collection powder contains a lot of valuable components and needs to be recycled.

And current utilization techniques include: the Chinese patent application CN110668704A relates to a method for comprehensively utilizing bag-type dedusting ash and fly ash of a blast furnace, wherein 70-85 parts by mass of the bag-type dedusting ash, 15-30 parts by mass of the fly ash and 0.3-1 part by mass of a binder are used as raw materials, the mixing ratio is adjusted, the mixture is granulated and pelletized, the pellets are put into a submerged arc furnace to generate molten iron and slag, the molten iron is discharged and cast into iron blocks, the slag is discharged and then spun into slag wool, the heat energy is fully utilized, two industrial solid wastes are utilized by one-time smelting, and two products of the iron blocks and the slag wool are finally obtained, so that the recycling has the advantages of low cost, high added value and strong practical value.

Disclosure of Invention

The application aims to provide rock wool, a preparation method and a preparation device thereof, and aims to solve the problems that dust collecting powder generated in the preparation of high-quality carbonaceous materials in a graphitization furnace is difficult to recycle and generated solid waste cannot be applied.

The embodiment of the invention provides a preparation method of rock wool, which comprises the following steps:

mixing the dust collecting powder, dolomite, basalt, waste ceramic chips and return materials of the graphitization furnace to obtain a first mixture;

mixing coke with the first mixture to obtain a second mixture;

preheating the second mixture to obtain a preheated mixture;

heating the preheated mixture to obtain a hot melt;

centrifuging the hot melt to form fibers to obtain fibers;

collecting cotton from the fibers to obtain a primary cotton layer;

paving cotton on the primary cotton layer to obtain a cotton felt;

curing and cutting the cotton felt to obtain rock wool;

wherein the first mixture comprises the following components in parts by mass: 90-110 parts of dust collecting powder of a graphitization furnace, 140 parts of dolomite, 350 parts of basalt, 160 parts of waste ceramic chips and 90-110 parts of return materials; the return materials comprise leftover materials of the rock wool and the rock wool which cannot form a fixed shape.

Optionally, the particle size of the first mixture is 1mm-5 mm.

Optionally, the amount of the coke is 140-160 parts by weight, and the particle size of the coke is 5mm-8 mm.

Optionally, the temperature of the pre-heated mixture is 450 ℃ to 550 ℃.

Optionally, the temperature of the hot melt is > 1500 ℃.

Optionally, the centrifugal speed of the centrifugal fiber forming is more than 7000 r/min.

Optionally, the fibres comprise a binder, the composition of which comprises a phenolic resin material.

Optionally, the curing temperature of the curing cutting is 220-250 ℃.

Based on the same invention concept, the embodiment of the invention also provides the rock wool, and the rock wool is prepared by adopting the preparation method of the rock wool.

Based on the same inventive concept, the embodiment of the invention also provides a rock wool preparation device, which comprises:

the mixing unit is used for mixing the dust collecting powder, dolomite, basalt, waste ceramic sheets and return materials of the graphitization furnace to obtain a first mixture and mixing the coke and the first mixture to obtain a second mixture;

the preheating unit is used for preheating the second mixture to obtain a preheated mixture; the preheating unit is communicated with the mixing unit and is used for receiving the second mixture;

the heating unit is used for heating the preheated mixture to obtain a hot melt; the heating unit is communicated with the preheating unit and is used for receiving the preheated mixture;

the fiber forming unit is used for centrifugally forming the hot melt into fibers to obtain fibers; the fiber forming unit comprises a centrifugal unit, a blowing unit and a fiber forming chamber, wherein the centrifugal unit is communicated with the fiber forming chamber and is used for sending fibers formed by centrifugation into the fiber forming chamber; the blowing unit is communicated with the fiber forming chamber and is used for blowing the bonding agent into the fiber forming chamber;

the cotton collecting unit is used for collecting cotton from the fibers to obtain a primary cotton layer, and the cotton collecting unit is communicated with the fiber forming chamber and used for receiving the fibers;

the cotton paving unit is used for paving cotton on the primary cotton layer to obtain a cotton felt; the cotton spreading unit is communicated with the cotton collecting unit and is used for receiving the primary cotton layer;

the curing and cutting unit is used for curing and cutting the cotton felt to obtain rock wool; the curing and cutting unit is communicated with the cotton paving unit and is used for receiving the cotton felt.

One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:

the embodiment of the invention provides a preparation method of rock wool, which comprises the following steps: mixing the dust collecting powder, dolomite, basalt, waste ceramic chips and return materials of the graphitization furnace to obtain a first mixture; mixing coke with the first mixture to obtain a second mixture; preheating the second mixture to obtain a preheated mixture; heating the preheated mixture to obtain a hot melt; centrifuging the hot melt to form fibers to obtain fibers; collecting cotton from the fibers to obtain a primary cotton layer; paving cotton on the primary cotton layer to obtain a cotton felt; curing and cutting the cotton felt to obtain rock wool; the first mixture comprises the following components in parts by mass: 90-110 parts of dust collecting powder of a graphitization furnace, 140 parts of dolomite, 350 parts of basalt, 160 parts of waste ceramic chips and 90-110 parts of return materials; the return materials comprise leftover materials of the rock wool and the rock wool which cannot form a fixed shape; the method for preparing the rock wool by using the dust-collecting powder of the graphitization furnace as the raw material solves the problem that the dust-collecting powder of solid wastes generated by the graphitization furnace is difficult to store and dispose. The pollution problem generated by the graphitization furnace is favorably solved; the purpose of comprehensive utilization of resources is achieved.

The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

FIG. 1 is a flow chart of a method provided by an embodiment of the present invention;

FIG. 2 is a block diagram of a method provided by an embodiment of the invention;

reference numerals in fig. 2: w11-dust collecting powder; w12-dolomite; w13-basalt; w14-waste ceramic tile; W15-Coke; w16-feed back; w2-mix; w3-hot melt; w4-fiber; W5-Cotton felt; w6-rock wool; w7-rock wool product.

Detailed Description

The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.

Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.

Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.

In order to solve the technical problems, the general idea of the embodiment of the application is as follows:

according to an exemplary embodiment of the present invention, there is provided a method for preparing rock wool, the method including:

s1, mixing dust collecting powder of a graphitization furnace, dolomite, basalt, waste ceramic chips and return materials to obtain a first mixture; the first mixture comprises the following components in parts by mass: 90-110 parts of dust collecting powder of a graphitization furnace, 140 parts of dolomite, 350 parts of basalt, 160 parts of waste ceramic chips and 90-110 parts of return materials; the return materials comprise leftover materials of the rock wool and the rock wool which cannot form a fixed shape;

the dust collecting powder of the graphitization furnace comprises the following specific components: na (Na)₂SO₄、Na₂SiF₆、SiO₂、K₂NaAlF₆、Ca₂AlF₇、Na₂SiO₃The reason for controlling the mass part of the dust collecting powder of the graphitization furnace to be 90-110 parts is that the acidity coefficient can be adjusted to ensure the normal range, the adverse effect of overlarge mass part value causes the acidity coefficient of the rock wool to be overlarge, and the adverse effect of undersize cannot achieve the purpose of comprehensive utilization of resources. Preferably, the mass part of the dust collecting powder of the graphitization furnace is 100 parts.

The dolomite is used as a refractory medium, the reason for controlling the mass part of the dolomite to be 120-140 parts is the fire resistance degree, the too large value of the mass part can cause the rock wool fiber to be coarse, and the too small value can influence the melt viscosity and influence the fiber performance. Preferably, the mass part of the dolomite is 130 parts.

The basalt has the function of preparing basic raw materials of the rock wool, the reason for controlling the mass part of the basalt to be 350-390 parts is that the basalt has extremely strong pressure resistance and weather resistance, the adverse effect of overlarge mass part is that the melting is difficult, and the adverse effect of undersize cannot reach the pressure resistance and the weather resistance of the rock wool. Preferably, the mass part of the basalt is 370 parts.

The waste ceramic chips are used for adjusting the acidity coefficient, the reason for controlling the mass part of the waste ceramic chips to be 140-160 parts is that the problem of overhigh acidity coefficient caused by dust collecting powder of the graphitization furnace can be adjusted, the adverse effect of overhigh mass part is overhigh cost, and the adverse effect of overlow mass part is that the acidity coefficient cannot be adjusted, so that the rock wool is unqualified to be produced. Preferably, the mass part of the waste ceramic chip is 150 parts.

The return material has the function of disposing waste materials in the production process and does not generate solid waste, and the reason for controlling the mass part of the return material to be 90-110 parts is to control the production amount of finished products in the production process. Preferably, the mass part of the feed back is 100 parts.

Specifically, the raw materials are mixed according to the specific gravity of dolomite, basalt, feed back, waste ceramic chips and dust collecting powder of a graphitization furnace and then crushed into particles of 1-5 mm. Wherein the basalt has the granularity of 6-10mm, and the over-range amount is not more than 10%; the granularity of dolomite is 4-6mm, and the over-range amount is not more than 10%; the dust collecting powder of the graphitization furnace is a powdery substance collected from each dust collecting port of the graphitization furnace, is industrial waste which is subjected to high-temperature gasification and temperature reduction recovery when the graphitization furnace is used for producing carbonaceous materials, takes sodium sulfate and sodium silicate as main components, is rich in carbon material resources in China, is a production place of main carbon materials in the world, and can generate 15kg of dust collecting powder when one ton of carbon materials are produced; the waste ceramic chip is waste generated in the process of producing ceramic products; the return material is rock wool leftover material produced and rock wool which can not form a fixed shape.

S2, mixing the coke and the first mixture to obtain a second mixture;

specifically, during or after the first mixture is mixed, 140 parts of coke with particle size of 5-8mm and 160 parts of specific gravity are added and mixed together to obtain a second mixture, and the second mixture is preferably prepared by mixing 150 parts of coke by mass.

S3, preheating the second mixture to obtain a preheated mixture;

as an alternative embodiment, the temperature of the preheated mixture is 450-550 ℃, specifically, the mixture is preheated to 450-550 ℃ by using combustion air and mixed with a part of air.

S4, heating the preheated mixture to obtain a hot melt;

as an alternative embodiment, the preheated mixture is introduced into a cupola furnace at a temperature of 1200-1280 ℃ to cause the mixture to form a hot melt, the mixture in the hot melt continues to flow downwardly and continues to be heated above 1500 ℃ by the heat provided by the hot coke to form a hot melt, and the hot melt flows out through the cupola siphon. Specifically, the fuel adopted by the cupola furnace is coke or anthracite or a mixture of the coke and high-quality anthracite. And the yellow phosphorus tail gas is supplemented as an auxiliary fuel; feeding main fuel coke or high-quality anthracite or a mixture of the coke and the high-quality anthracite and a mixture of dust collecting powder, dolomite, basalt and waste ceramic chip powder into a cupola furnace; and the auxiliary fuel yellow phosphorus tail gas is blown into the cupola furnace through high-temperature air generated by combustion to melt the materials.

S5, carrying out centrifugal fiber forming on the hot melt to obtain fibers;

as an optional implementation mode, the hot melt flow falls into a high-speed centrifugal force with the rotating speed of more than 7000r/min, the high-temperature solution flowing into the centrifugal fiber forming machine through the high-pressure roots blower is drawn into fibers by the centrifugal force of the centrifugal roller and the air flow sprayed out by the air ring, the fibers are sprayed into the fiber forming chamber, and a binder made of a phenolic resin material is sprayed in the spraying process at the same time, specifically, the component of the binder is a mixed liquid of the phenolic resin and water with the mass ratio of 1: 2; the slag balls are separated, and the fibers are blown into a cotton collector; the slag balls fall into a slag pit, and the slag balls are periodically cleaned to remove waste slag and return to production.

S6, collecting and collecting the fibers to obtain a primary cotton layer;

as an alternative embodiment, the fibers with the adhesive are collected by a negative pressure mode of a cotton collecting machine; the fiber containing the binder is uniformly settled on a cotton collecting belt running at high speed under the suction action of a negative pressure fan of the cotton collecting machine to form a primary cotton layer, and the suction fan is adjusted by frequency conversion at any time according to the felting condition; the pressure intensity of the primary cotton felt is adjusted by changing the rotating speed of the cotton collecting drum so as to control the product quality.

S7, paving cotton on the primary cotton layer to obtain a cotton felt;

as an alternative embodiment, the initial cotton layer is formed into a uniform cotton felt in a multi-layer folding structure form on a forming conveyor arranged according to forming requirements under the reciprocating swing action of a pendulum belt of a pendulum machine, and the cotton felt is pressurized and then enters a curing furnace for curing.

And S8, curing and cutting the cotton felt to obtain the rock wool.

As an alternative embodiment, the multi-layer cotton felt formed on the forming machine enters the curing oven after being pressurized. Pressurizing the felt layer by upper and lower chain plates in a curing furnace and curing the felt layer by hot air to form a rock wool wall plate and a rock wool felt with certain thickness and volume weight, blowing 220-and 250-DEG C hot air through the felt layer to cure the binder and form a continuous cotton plate or cotton felt with certain thickness and strength, and cooling and cutting the cotton plate or cotton felt from the curing furnace to obtain the rock wool product. Specifically, the temperature in the curing furnace is 220-250 ℃, hot air is provided by the fluidized bed furnace, and yellow phosphorus tail gas, bituminous coal, anthracite or available low-grade coal is used as fuel.

According to another exemplary embodiment of the present invention, there is also provided a rock wool manufactured by the method for manufacturing a rock wool provided above.

According to another exemplary embodiment of the present invention, there is also provided a rock wool manufacturing apparatus, including:

the mixing unit is used for mixing the dust collecting powder, dolomite, basalt, waste ceramic sheets and return materials of the graphitization furnace to obtain a first mixture and mixing the coke and the first mixture to obtain a second mixture;

the preheating unit is used for preheating the second mixture to obtain a preheated mixture; the preheating unit is communicated with the mixing unit and is used for receiving the second mixture;

the heating unit is used for heating the preheated mixture to obtain a hot melt; the heating unit is communicated with the preheating unit and is used for receiving the preheated mixture;

the fiber forming unit is used for centrifugally forming the hot melt into fibers to obtain fibers; the fiber forming unit comprises a centrifugal unit, a blowing unit and a fiber forming chamber, wherein the centrifugal unit is communicated with the fiber forming chamber and is used for sending fibers formed by centrifugation into the fiber forming chamber; the blowing unit is communicated with the fiber forming chamber and is used for blowing the bonding agent into the fiber forming chamber;

the cotton collecting unit is used for collecting cotton from the fibers to obtain a primary cotton layer, and the cotton collecting unit is communicated with the fiber forming chamber and used for receiving the fibers;

the cotton paving unit is used for paving cotton on the primary cotton layer to obtain a cotton felt; the cotton spreading unit is communicated with the cotton collecting unit and is used for receiving the primary cotton layer;

the curing and cutting unit is used for curing and cutting the cotton felt to obtain rock wool; the curing and cutting unit is communicated with the cotton paving unit and is used for receiving the cotton felt.

The rock wool of the present application, the method for producing the same, and the apparatus for producing the same will be described in detail below with reference to examples, comparative examples, and experimental data.

Example 1

Referring to fig. 2, a method for preparing rock wool includes:

crushing and mixing: the dust collecting powder W11, dolomite W12, basalt W13, waste porcelain piece W14, coke W15, return material W16 and the like of the graphitization furnace are taken as raw materials, and the raw materials are prepared by mixing 130 parts of dolomite, 370 parts of basalt, 100 parts of return material, 150 parts of waste porcelain piece and 100 parts of dust collecting powder according to the specific gravity and crushing into particles of 1-5 mm.

High-temperature melting: the mixed material W2 is added from the upper part of a rock wool melting furnace by a belt conveyor, and is sent into the melting furnace to be heated and melted to enter a melt launder, the rock wool melting furnace adopts coke as fuel, and combustion-supporting air is preheated to 450 ℃ and mixed with air in a certain proportion. The material started softening at 1200 c and began a complex physicochemical reaction to form a hot melt W3. The hot melt W3 continues to flow downward and contacts the incandescent coke W15 and flue gas, is heated to above 1500 deg.C, flows out through the siphon of the rock wool melting furnace, and enters the centrifuge through the chute to form the fiber W4. The melt strip must maintain a layer of glowing incandescent coke (bottom coke) to prevent the melt from condensing at the bottom.

Centrifugal fiber forming: the hot melt W3 flows into a high-speed centrifugal force with the rotating speed of more than 7000r/min, the hot melt W3 flowing into the centrifugal fiber forming machine through the high-pressure Roots blower is drafted into fibers by the centrifugal force of a centrifugal roller and air flow sprayed by an air ring, the fibers are sprayed into a fiber forming chamber, a bonding agent made of phenolic resin materials is sprayed in the spraying process, and the used commercial phenolic resin is adjusted to be generally 1:2 by adding water; the slag balls are separated, and the fibers are blown into a cotton collector; the slag balls fall into a slag pit, and the slag balls are periodically cleaned to recover waste slag and returned to production. The roller of the centrifuge is cooled by forced water, and the bearing is lubricated by oil gas.

Collecting cotton: collecting the fiber W4 with the binder by a negative pressure mode of a cotton collector; fibers containing the binder are uniformly settled on a cotton collecting belt running at a high speed under the suction action of a negative pressure fan of a cotton collecting machine to form a primary cotton layer, and waste residues are periodically cleaned and recovered; the suction fan adopts frequency conversion adjustment and is adjusted at any time according to the felt forming condition; the product quality is controlled by changing the rotation speed of the cotton collecting drum (the rotation speed is 60r/min) to adjust the initial rotation speed, and the product requirement is met.

B, pendulum bob cotton laying: the initial cotton layer forms a multilayer uniform cotton felt W5 with a folding structure on a forming conveyor arranged according to forming requirements under the reciprocating swing action of a pendulum belt of a pendulum machine, the cotton felt is pressurized and then enters a curing furnace for curing treatment, and waste residues are periodically cleaned and recovered.

Curing and cutting: the multilayer cotton felt formed on the forming machine enters a curing oven after being pressurized. Pressurizing the felt layer by upper and lower chain plates in a curing furnace and curing the felt layer by hot air to form rock wool W6 with certain thickness and volume weight, blowing 220 ℃ hot air through the felt layer to cure the binder and form a continuous cotton board or cotton felt with certain thickness and strength, cooling the cotton board or cotton felt from the curing furnace, cutting the cured product (adjusted according to the curing state of the cotton), obtaining a rock wool product W7 after cutting, and periodically cleaning and recovering waste residues.

Example 2

Referring to fig. 2, a method for preparing rock wool includes:

crushing and mixing: the dust collecting powder W11, dolomite W12, basalt W13, waste ceramic pieces W14, coke W15, return material W16 and the like of the graphitization furnace are prepared by taking 120 parts of dolomite, 350 parts of basalt, 90 parts of return material, 140 parts of waste ceramic pieces and 90 parts of dust collecting powder as raw materials, mixing and crushing into particles of 1-5 mm.

High-temperature melting: the mixed material W2 is added from the upper part of a rock wool melting furnace by a belt conveyor, and is sent into the melting furnace to be heated and melted to enter a melt launder, the rock wool melting furnace adopts coke as fuel, and combustion-supporting air is preheated to 450 ℃ and mixed with air in a certain proportion. The material started softening at 1200 c and began a complex physicochemical reaction to form a hot melt W3. The hot melt W3 continues to flow downward and contacts the incandescent coke W15 and flue gas, is heated to above 1500 deg.C, flows out through the siphon of the rock wool melting furnace, and enters the centrifuge through the chute to form the fiber W4. The melt strip must maintain a layer of glowing incandescent coke (bottom coke) to prevent the melt from condensing at the bottom.

Centrifugal fiber forming: the hot melt W3 flows into a high-speed centrifugal force with the rotating speed of more than 7000r/min, the hot melt W3 flowing into the centrifugal fiber forming machine through the high-pressure Roots blower is drafted into fibers by the centrifugal force of a centrifugal roller and air flow sprayed by an air ring, the fibers are sprayed into a fiber forming chamber, a bonding agent made of phenolic resin materials is sprayed in the spraying process, and the used commercial phenolic resin is adjusted to be generally 1:2 by adding water; the slag balls are separated, and the fibers are blown into a cotton collector; the slag balls fall into a slag pit, and the slag balls are periodically cleaned to recover waste slag and returned to production. The roller of the centrifuge is cooled by forced water, and the bearing is lubricated by oil gas.

Collecting cotton: collecting the fiber W4 with the binder by a negative pressure mode of a cotton collector; fibers containing the binder are uniformly settled on a cotton collecting belt running at a high speed under the suction action of a negative pressure fan of a cotton collecting machine to form a primary cotton layer, and waste residues are periodically cleaned and recovered; the suction fan adopts frequency conversion adjustment and is adjusted at any time according to the felt forming condition; the product quality is controlled by changing the rotation speed of the cotton collecting drum (the rotation speed is 60r/min) to adjust the initial rotation speed, and the product requirement is met.

B, pendulum bob cotton laying: the initial cotton layer forms a multilayer uniform cotton felt W5 with a folding structure on a forming conveyor arranged according to forming requirements under the reciprocating swing action of a pendulum belt of a pendulum machine, the cotton felt is pressurized and then enters a curing furnace for curing treatment, and waste residues are periodically cleaned and recovered.

Curing and cutting: the multilayer cotton felt formed on the forming machine enters a curing oven after being pressurized. Pressurizing the felt layer by upper and lower chain plates in a curing furnace and curing the felt layer by hot air to form rock wool W6 with certain thickness and volume weight, blowing 220 ℃ hot air through the felt layer to cure the binder and form a continuous cotton board or cotton felt with certain thickness and strength, cooling the cotton board or cotton felt from the curing furnace, cutting the cured product (adjusted according to the curing state of the cotton), obtaining a rock wool product W7 after cutting, and periodically cleaning and recovering waste residues.

Example 3

Referring to fig. 2, a method for preparing rock wool includes:

crushing and mixing: the dust collecting powder W11, dolomite W12, basalt W13, waste ceramic pieces W14, coke W15, return material W16 and the like of the graphitization furnace are prepared by taking 140 parts of dolomite, 390 parts of basalt, 110 parts of return material, 160 parts of waste ceramic pieces and 110 parts of dust collecting powder as raw materials, mixing and crushing into particles of 1-5 mm.

High-temperature melting: the mixed material W2 is added from the upper part of a rock wool melting furnace by a belt conveyor, and is sent into the melting furnace to be heated and melted to enter a melt launder, the rock wool melting furnace adopts coke as fuel, and combustion-supporting air is preheated to 450 ℃ and mixed with air in a certain proportion. The material started softening at 1200 c and began a complex physicochemical reaction to form a hot melt W3. The hot melt W3 continues to flow downward and contacts the incandescent coke W15 and flue gas, is heated to above 1500 deg.C, flows out through the siphon of the rock wool melting furnace, and enters the centrifuge through the chute to form the fiber W4. The melt strip must maintain a layer of glowing incandescent coke (bottom coke) to prevent the melt from condensing at the bottom.

Centrifugal fiber forming: the hot melt W3 flows into a high-speed centrifugal force with the rotating speed of more than 7000r/min, the hot melt W3 flowing into the centrifugal fiber forming machine through the high-pressure Roots blower is drafted into fibers by the centrifugal force of a centrifugal roller and air flow sprayed by an air ring, the fibers are sprayed into a fiber forming chamber, a bonding agent made of phenolic resin materials is sprayed in the spraying process, and the used commercial phenolic resin is adjusted to be generally 1:2 by adding water; the slag balls are separated, and the fibers are blown into a cotton collector; the slag balls fall into a slag pit, and the slag balls are periodically cleaned to recover waste slag and returned to production. The roller of the centrifuge is cooled by forced water, and the bearing is lubricated by oil gas.

Collecting cotton: collecting the fiber W4 with the binder by a negative pressure mode of a cotton collector; fibers containing the binder are uniformly settled on a cotton collecting belt running at a high speed under the suction action of a negative pressure fan of a cotton collecting machine to form a primary cotton layer, and waste residues are periodically cleaned and recovered; the suction fan adopts frequency conversion adjustment and is adjusted at any time according to the felt forming condition; the product quality is controlled by changing the rotation speed of the cotton collecting drum (the rotation speed is 60r/min) to adjust the initial rotation speed, and the product requirement is met.

B, pendulum bob cotton laying: the initial cotton layer forms a multilayer uniform cotton felt W5 with a folding structure on a forming conveyor arranged according to forming requirements under the reciprocating swing action of a pendulum belt of a pendulum machine, the cotton felt is pressurized and then enters a curing furnace for curing treatment, and waste residues are periodically cleaned and recovered.

Curing and cutting: the multilayer cotton felt formed on the forming machine enters a curing oven after being pressurized. Pressurizing the felt layer by upper and lower chain plates in a curing furnace and curing the felt layer by hot air to form rock wool W6 with certain thickness and volume weight, blowing 220 ℃ hot air through the felt layer to cure the binder and form a continuous cotton board or cotton felt with certain thickness and strength, cooling the cotton board or cotton felt from the curing furnace, cutting the cured product (adjusted according to the curing state of the cotton), obtaining a rock wool product W7 after cutting, and periodically cleaning and recovering waste residues.

Comparative example 1

Referring to fig. 2, a method for preparing rock wool includes:

crushing and mixing: the dust collecting powder W11, dolomite W12, basalt W13, waste ceramic pieces W14, coke W15, return material W16 and the like of the graphitization furnace are prepared by taking 170 parts of dolomite, 450 parts of basalt, 150 parts of return material, 120 parts of waste ceramic pieces and 120 parts of dust collecting powder as raw materials, mixing and crushing into particles of 1-5 mm.

High-temperature melting: the mixed material W2 is added from the upper part of a rock wool melting furnace by a belt conveyor, and is sent into the melting furnace to be heated and melted to enter a melt launder, the rock wool melting furnace adopts coke as fuel, and combustion-supporting air is preheated to 450 ℃ and mixed with air in a certain proportion. The material started softening at 1200 c and began a complex physicochemical reaction to form a hot melt W3. The hot melt W3 continues to flow downward and contacts the incandescent coke W15 and flue gas, is heated to above 1500 deg.C, flows out through the siphon of the rock wool melting furnace, and enters the centrifuge through the chute to form the fiber W4. The melt strip must maintain a layer of glowing incandescent coke (bottom coke) to prevent the melt from condensing at the bottom.

Centrifugal fiber forming: the hot melt W3 flows into a high-speed centrifugal force with the rotating speed of more than 7000r/min, the hot melt W3 flowing into the centrifugal fiber forming machine through the high-pressure Roots blower is drafted into fibers by the centrifugal force of a centrifugal roller and air flow sprayed by an air ring, the fibers are sprayed into a fiber forming chamber, a bonding agent made of phenolic resin materials is sprayed in the spraying process, and the used commercial phenolic resin is adjusted to be generally 1:2 by adding water; the slag balls are separated, and the fibers are blown into a cotton collector; the slag balls fall into a slag pit, and the slag balls are periodically cleaned to recover waste slag and returned to production. The roller of the centrifuge is cooled by forced water, and the bearing is lubricated by oil gas.

Collecting cotton: collecting the fiber W4 with the binder by a negative pressure mode of a cotton collector; fibers containing the binder are uniformly settled on a cotton collecting belt running at a high speed under the suction action of a negative pressure fan of a cotton collecting machine to form a primary cotton layer, and waste residues are periodically cleaned and recovered; the suction fan adopts frequency conversion adjustment and is adjusted at any time according to the felt forming condition; the product quality is controlled by changing the rotation speed of the cotton collecting drum (the rotation speed is 60r/min) to adjust the initial rotation speed, and the product requirement is met.

B, pendulum bob cotton laying: the initial cotton layer forms a multilayer uniform cotton felt W5 with a folding structure on a forming conveyor arranged according to forming requirements under the reciprocating swing action of a pendulum belt of a pendulum machine, the cotton felt is pressurized and then enters a curing furnace for curing treatment, and waste residues are periodically cleaned and recovered.

Curing and cutting: the multilayer cotton felt formed on the forming machine enters a curing oven after being pressurized. Pressurizing the felt layer by upper and lower chain plates in a curing furnace and curing the felt layer by hot air to form rock wool W6 with certain thickness and volume weight, blowing 220 ℃ hot air through the felt layer to cure the binder and form a continuous cotton board or cotton felt with certain thickness and strength, cooling the cotton board or cotton felt from the curing furnace, cutting the cured product (adjusted according to the curing state of the cotton), obtaining a rock wool product W7 after cutting, and periodically cleaning and recovering waste residues.

Comparative example 2

Referring to fig. 2, a method for preparing rock wool includes:

crushing and mixing: the dust collecting powder W11, dolomite W12, basalt W13, waste ceramic pieces W14, coke W15, return material W16 and the like of the graphitization furnace are prepared by taking 90 parts of dolomite, 300 parts of basalt, 50 parts of return material, 170 parts of waste ceramic pieces and 70 parts of dust collecting powder as raw materials, mixing and crushing into particles of 1-5 mm.

High-temperature melting: the mixed material W2 is added from the upper part of a rock wool melting furnace by a belt conveyor, and is sent into the melting furnace to be heated and melted to enter a melt launder, the rock wool melting furnace adopts coke as fuel, and combustion-supporting air is preheated to 450 ℃ and mixed with air in a certain proportion. The material started softening at 1200 c and began a complex physicochemical reaction to form a hot melt W3. The hot melt W3 continues to flow downward and contacts the incandescent coke W15 and flue gas, is heated to above 1500 deg.C, flows out through the siphon of the rock wool melting furnace, and enters the centrifuge through the chute to form the fiber W4. The melt strip must maintain a layer of glowing incandescent coke (bottom coke) to prevent the melt from condensing at the bottom.

Centrifugal fiber forming: the hot melt W3 flows into a high-speed centrifugal force with the rotating speed of more than 7000r/min, the hot melt W3 flowing into the centrifugal fiber forming machine through the high-pressure Roots blower is drafted into fibers by the centrifugal force of a centrifugal roller and air flow sprayed by an air ring, the fibers are sprayed into a fiber forming chamber, a bonding agent made of phenolic resin materials is sprayed in the spraying process, and the used commercial phenolic resin is adjusted to be generally 1:2 by adding water; the slag balls are separated, and the fibers are blown into a cotton collector; the slag balls fall into a slag pit, and the slag balls are periodically cleaned to recover waste slag and returned to production. The roller of the centrifuge is cooled by forced water, and the bearing is lubricated by oil gas.

Collecting cotton: collecting the fiber W4 with the binder by a negative pressure mode of a cotton collector; fibers containing the binder are uniformly settled on a cotton collecting belt running at a high speed under the suction action of a negative pressure fan of a cotton collecting machine to form a primary cotton layer, and waste residues are periodically cleaned and recovered; the suction fan adopts frequency conversion adjustment and is adjusted at any time according to the felt forming condition; the product quality is controlled by changing the rotation speed of the cotton collecting drum (the rotation speed is 60r/min) to adjust the initial rotation speed, and the product requirement is met.

B, pendulum bob cotton laying: the initial cotton layer forms a multilayer uniform cotton felt W5 with a folding structure on a forming conveyor arranged according to forming requirements under the reciprocating swing action of a pendulum belt of a pendulum machine, the cotton felt is pressurized and then enters a curing furnace for curing treatment, and waste residues are periodically cleaned and recovered.

Curing and cutting: the multilayer cotton felt formed on the forming machine enters a curing oven after being pressurized. Pressurizing the felt layer by upper and lower chain plates in a curing furnace and curing the felt layer by hot air to form rock wool W6 with certain thickness and volume weight, blowing 220 ℃ hot air through the felt layer to cure the binder and form a continuous cotton board or cotton felt with certain thickness and strength, cooling the cotton board or cotton felt from the curing furnace, cutting the cured product (adjusted according to the curing state of the cotton), obtaining a rock wool product W7 after cutting, and periodically cleaning and recovering waste residues.

Related experiments:

the rock wool produced in examples 1 to 3 and comparative examples 1 to 2 was examined and the results are shown in the following table:

in the table, the short-term water absorption amount means a water absorption amount of 24 hours after entering 10 mm; the calculated slag ball content is the slag ball with the grain diameter larger than 0.25 mm; the compressive strength is a compressive strength of 10% deformation.

The rock wool prepared by the method has the effect of meeting the requirements of rock wool for heat insulation, slag and products GB/T11835-2016; as can be seen from comparison of the data of the comparative example and the examples, when the respective compounding ratios of the mixture are out of the ranges provided by the present method, problems such as fiber coarsening, poor compressive strength, and an unsatisfactory acidity coefficient may occur.

One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:

(1) the method provided by the embodiment of the invention takes the dust collecting powder of the graphitization furnace as the raw material to prepare the rock wool, can completely utilize the dust collecting powder of the solid waste generated by graphitization to treat the solid waste generated by the graphitization furnace and produce the rock wool, and solves the problem of the solid waste generated in the production process of the graphitization furnace;

(2) the method provided by the embodiment of the invention uses the dust collection powder of the graphitization furnace as the raw material to prepare the rock wool, and solves the problem that the dust collection powder of the solid waste generated by the graphitization furnace is difficult to store and dispose. The pollution problem generated by the graphitization furnace is favorably solved; the purpose of comprehensive utilization of resources is achieved;

(3) the rock wool provided by the embodiment of the invention has good chemical stability; the acidity coefficient was 1.7, the tensile strength was 9.6kPa, and the short-term water absorption (varying immersion 10mm,24 hours) was 0.1kg/m²A density of 83kg/m³The continuous combustion time is 0, the hydrophobic rate reaches 99.5%, the slag ball content (the grain diameter is more than 0.25mm) is 3.7%, and the heat conductivity coefficient is 0.034W/(m.k). The performance of the heat-insulating rock wool board is tested, the average diameter of the fiber is 4.7 mu m, the maximum use temperature is 640-650 ℃, the tensile strength is 9.4kPa, and the compressive strength is 65kPa (deformation 10%).

Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.