阅读说明：本技术 一种矿渣、钢渣复合微粉辊压机终粉磨方法 (Final grinding method of slag and steel slag composite micro powder roller press ) 是由 李勋 沈元奎 于 2019-10-10 设计创作，主要内容包括：本发明公开了一种矿渣、钢渣复合微粉辊压机终粉磨方法,其特征在于,包括如下步骤：步骤A：原料进厂；步骤B：原料配料；步骤C：加湿混料；步骤D：辊压粉磨；步骤E：静选烘干,从高压辊压机下方出来的料饼物料经过斗提机提升到静态选粉机进行打散,同时由燃气热风炉提供热风对打散后的细粉颗粒进行烘干,打散后合格的细粉颗粒分离出来进入第一旋风筛选器进行收集后进入动态选粉机再经过第二旋风筛选器后产出成品装车入库；本方法能对钢渣进行有效的加工再利用,投资小、每吨电耗小于40KWh,生产成本较其它生产方式大大降低,无论是作为水泥混合料还是作为混凝土掺合料均具有较强的竞争优势。(The invention discloses a final grinding method of a slag and steel slag composite micro powder roller press, which is characterized by comprising the following steps of: step A: raw materials enter a factory; and B: raw material proportioning; and C: humidifying and mixing; step D: rolling and grinding; step E: static selection drying, namely lifting the material cake materials coming out of the lower part of a high-pressure roller press to a static powder concentrator through a bucket elevator for scattering, simultaneously providing hot air by a gas hot-blast stove for drying scattered fine powder particles, separating qualified fine powder particles after scattering, entering a first cyclone screening device for collection, entering a dynamic powder concentrator, passing through a second cyclone screening device, producing finished products, loading the finished products into a truck and warehousing the finished products; the method can effectively process and recycle the steel slag, has small investment and less than 40KWh of power consumption per ton, greatly reduces the production cost compared with other production modes, and has stronger competitive advantages when being used as a cement mixture or a concrete admixture.)

1. The final grinding method of the slag and steel slag composite micro powder roller press is characterized by comprising the following steps of:

step A: the raw materials enter a factory, and the generated steel slag and slag are transported to a production factory through an automobile and are correspondingly placed in a steel slag bin and a slag bin;

and B: raw material proportioning, namely respectively conveying corresponding amounts of steel slag and slag from a steel slag bin and a slag hopper by a steel slag constant feeder according to a proportioning proportion set by a central control system, and then sequentially forming a mixed raw material under the action of a first belt conveyor and a vibrating screen and conveying the mixed raw material into a slag material buffer bin for later use;

and C: humidifying and mixing, namely conveying the mixed raw materials in the slag buffer bin into a screw conveyor through a mixing constant feeder and a second belt conveyor in sequence, adding the mixed raw materials into a double-shaft humidifying mixer for humidifying, and feeding the mixed raw materials containing a certain water quantity into a weighing steady flow bin;

step D: rolling and grinding, namely, enabling the mixed raw materials in the weighing and flow stabilizing bin to enter a high-pressure rolling machine for high-pressure extrusion to form a material cake material with cracks and easy grinding;

step E: and (3) carrying out static selection drying, lifting the material cake materials coming out from the lower part of the high-pressure roller press to a static powder concentrator through a bucket elevator for scattering, simultaneously providing hot air by a gas hot-blast stove for drying scattered fine powder particles, separating qualified fine powder particles after scattering, entering a first cyclone screening device for collection, entering a dynamic powder concentrator, passing through a second cyclone screening device, and then producing finished products, loading and warehousing.

2. The slag and steel slag composite micropowder roller press final grinding method according to claim 1, characterized in that in step E, the coarse powder of the static powder concentrator is subjected to iron removal by a static separator, and then enters a double-shaft humidifying blender again for humidifying and mixing, and then step C is carried out; and D, after deironing the unqualified powder of the dynamic powder concentrator by using a dynamic selection deironing device, humidifying and mixing the unqualified powder in the double-shaft humidifying mixer again, and then performing the step C.

3. The slag and steel slag composite micropowder roller press final grinding method according to claim 2, characterized in that in the step A, the steel slag generated in the steel-making process is subjected to early-stage hot braising, iron removal and crushing to obtain nonmagnetic steel slag, and then the nonmagnetic steel slag is transported to a production plant area by an automobile and is placed into a steel slag bin.

4. The slag and steel slag composite micropowder roller press final grinding method according to claim 3, wherein in the step B, the outer diameter of the mixed raw material after being screened by the vibrating screen is not more than 20 mm.

5. The slag and steel slag composite micropowder roller mill finish grinding method according to claim 3, characterized in that in step C, the amount of water added during humidification is set by a central control system.

6. The slag and steel slag composite micropowder roller mill finish grinding method as set forth in any one of claims 1 to 5, wherein in step D, the mixed raw material is subjected to high pressure extrusion at 100-150MPa and then divided into fine finished product particles and fine unfinished product particles, and a large number of cracks are generated inside the unfinished product particles.

7. The slag and steel slag composite micropowder roller press final grinding method according to claim 6, wherein in step E, the fineness of qualified fine powder particles is controlled by adjusting the wind speed and wind volume in the static powder concentrator and the dynamic powder concentrator through a frequency converter.

Technical Field

The invention belongs to the field of recycling of available resources of slag and steel slag, and particularly relates to a final grinding method of a slag and steel slag composite micro powder roller press.

Background

The slag is widely used and is made into slag cement, slag micro powder, slag portland cement, slag wool, granulated blast furnace slag powder and the like.

The steel slag is a byproduct in the steel making process, the yield of the steel slag is ~ 15% of the yield of crude steel according to the current steel making level at home and abroad, so far, people have developed nearly 40 methods related to the comprehensive utilization of the steel slag, but an effective way for large-scale resource utilization of the steel slag resource is not found at present, and the realization of zero emission of the steel slag is a difficult problem in the world steel industry.

The relative utilization rate of the steel slag is low, the internal recycling modes of steel plants such as waste steel recovery, magnetic separation fine iron powder and flux are mainly used, the using amount is limited, at present, about 70 percent of the steel slag is in a stacking and landfill state, and the problems of environmental pollution, resource waste and the like exist. Because the steel slag is formed at high temperature in steel making, dicalcium silicate and tricalcium silicate minerals in the steel slag are completely crystallized, coarse and compact in crystal grains and slow in hydration hardening speed. In order to improve the hydraulic activity of the steel slag, special grinding equipment is required. The grinding process is not only a particle reduction process, but also a change process accompanied with a crystal structure and physicochemical properties.

Dislocation of crystal lattices is generated in the grinding process or an amorphous structure which is easy to dissolve in water is formed on the surface, so that the hydration reaction is accelerated. The slag and steel slag composite micro powder can be used for producing cement, bricks, concrete admixture, road building materials and the like, is a development direction of steel slag resource utilization, has wide application range and large demand, can digest huge yield of steel slag, and reduces the influence of the steel slag on the environment.

Disclosure of Invention

The invention aims to provide a final grinding method of a roller press for slag and steel slag composite micropowder, so that the effective processing and recycling of the steel slag are improved; the technical scheme adopted for achieving the purpose is as follows:

a final grinding method of a slag and steel slag composite micro powder roller press comprises the following steps:

step A: the raw materials enter a factory, and the generated steel slag and slag are transported to a production factory through an automobile and are correspondingly placed in a steel slag bin and a slag bin;

and B: raw material proportioning, namely respectively conveying corresponding amounts of steel slag and slag from a steel slag bin and a slag hopper by a steel slag constant feeder according to a proportioning proportion set by a central control system, and then sequentially forming a mixed raw material under the action of a first belt conveyor and a vibrating screen and conveying the mixed raw material into a slag material buffer bin for later use;

and C: humidifying and mixing, namely conveying the mixed raw materials in the slag buffer bin into a screw conveyor through a mixing constant feeder and a second belt conveyor in sequence, adding the mixed raw materials into a double-shaft humidifying mixer for humidifying, and feeding the mixed raw materials containing a certain water quantity into a weighing steady flow bin;

step D: rolling and grinding, namely, enabling the mixed raw materials in the weighing and flow stabilizing bin to enter a high-pressure rolling machine for high-pressure extrusion to form a material cake material with cracks and easy grinding;

step E: and (3) carrying out static selection drying, lifting the material cake materials coming out from the lower part of the high-pressure roller press to a static powder concentrator through a bucket elevator for scattering, simultaneously providing hot air by a gas hot-blast stove for drying scattered fine powder particles, separating qualified fine powder particles after scattering, entering a first cyclone screening device for collection, entering a dynamic powder concentrator, passing through a second cyclone screening device, and then producing finished products, loading and warehousing.

Preferably, in the step E, the coarse powder of the static powder concentrator is subjected to iron removal through a static iron remover, and then enters the double-shaft humidifying mixer again for humidifying and mixing, and then the step C is carried out; and D, after deironing the unqualified powder of the dynamic powder concentrator by using a dynamic selection deironing device, humidifying and mixing the unqualified powder in the double-shaft humidifying mixer again, and then performing the step C.

Preferably, in the step A, the steel slag generated in the steel-making process is subjected to early-stage hot braising, iron removal and crushing to obtain nonmagnetic steel slag, and then the nonmagnetic steel slag is transported to a production plant area by an automobile and is placed into a steel slag bin.

Preferably, in step B, the outer diameter of the mixed raw material after being sieved by the vibrating screen is not more than 20 mm.

Preferably, in step C, the amount of water added during humidification is set by a central control system.

Preferably, in the step D, the mixed raw material is divided into finished fine particles and unfinished fine particles after being subjected to the high-pressure extrusion of 100-150MPa, and a large number of cracks are generated inside the unfinished fine particles.

Preferably, in the step E, the wind speed and the wind quantity in the static powder concentrator and the dynamic powder concentrator are adjusted through a frequency converter to control the fineness of the qualified fine powder particles.

The invention has the following beneficial effects: (1) in the step A, the steel slag generated in the steel-making process is subjected to early-stage hot braising, iron removal and crushing to obtain the nonmagnetic steel slag which does not contain large iron and has uniform particles, and the nonmagnetic steel slag is taken as a raw material and is transported to a production plant area by an automobile to be placed into a steel slag bin.

(2) In the step B, the mixed raw materials subjected to the double functions of proportioning and vibration screening have the characteristics of uniform mixing and uniform size, and are convenient for subsequent working procedures;

(3) in the step C, the mixed raw materials are easy to grind and difficult to generate dust after 10 percent of water is added.

(4) In the step D, the material cake material formed after high-pressure rolling contains finished product fine particles and non-finished product fine particles, a large number of cracks are generated inside the non-finished product fine particles, the grindability is improved, and in the further crushing process, the grinding energy consumption can be greatly reduced, and the yield is improved;

(5) in the step E, the qualified fine powder particles separated by the static powder concentrator are further winnowed by the high-efficiency superfine powder concentrator to obtain finished product composite micro powder with the specific surface area of 400cm2/g to 550cm2/g, the powder concentration efficiency reaches more than 70 percent, stepless speed regulation can be carried out by a central control system in the process, the fineness is convenient and flexible to regulate, the high-efficiency superfine powder concentrator adopts a scattering disc with high scattering capacity, the material particles can be fully dispersed and lifted, a high-efficiency low-resistance cyclone cylinder is adopted, the airflow resistance is reduced, the micro powder collection capacity is improved, and the air leakage rate is greatly reduced by adopting a duplex air lock valve; conveying the selected finished composite micro powder to a finished product warehouse through a chute, deironing the unqualified powder by a static powder concentrator deironing device and a dynamic powder concentrator deironing device, and then feeding the unqualified powder into a double-shaft humidifying mixer for secondary humidifying and mixing, rolling, winnowing and the like;

(6) in conclusion, the method can effectively process and recycle the steel slag, has small investment and less than 40KWh of power consumption per ton, greatly reduces the production cost compared with other production modes, and has stronger competitive advantages both as a cement mixture and a concrete admixture.

Drawings

FIG. 1 is a flow chart of the operation of the present invention.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

As shown in fig. 1, a final grinding method of a slag and steel slag composite micropowder roller press comprises the following steps:

step A: the raw materials enter a factory, and the generated steel slag and slag are transported to a production factory through an automobile and are correspondingly placed in a steel slag bin and a slag bin;

and B: raw material proportioning, namely respectively conveying corresponding amounts of steel slag and slag from a steel slag bin and a slag hopper by a steel slag constant feeder according to a proportioning proportion set by a central control system, screening the steel slag and the slag by a first belt conveyor and a vibrating screen in sequence to obtain a mixed raw material with the outer diameter of not more than 20 mm, and conveying the mixed raw material into a slag buffer bin for later use;

and C: humidifying and mixing, namely conveying the mixed raw materials in the slag buffer bin into a screw conveyor through a mixing constant feeder and a second belt conveyor in sequence, adding the mixed raw materials into a double-shaft humidifying mixer for humidifying, and feeding the mixed raw materials containing a certain water quantity into a weighing steady flow bin; the amount of water added during humidification is set by a central control system;

step D: rolling and grinding, wherein the mixed raw materials in the weighing and flow stabilizing bin enter a high-pressure roller press to be subjected to the high-pressure extrusion action of 100-; the cake material contains finished product fine particles and unfinished product fine particles, and a large number of cracks are generated inside the unfinished product fine particles;

step E: and (3) carrying out static selection drying, lifting the material cake materials coming out from the lower part of the high-pressure roller press to a static powder concentrator through a bucket elevator for scattering, simultaneously providing hot air by a gas hot-blast stove for drying scattered fine powder particles, separating qualified fine powder particles after scattering, entering a first cyclone screening device for collection, entering a dynamic powder concentrator, passing through a second cyclone screening device, and then producing finished products, loading and warehousing.

The static powder concentrator is also connected with a cyclone separator, fine powder particles are collected by centrifugal force, and when the airflow containing powder enters the cyclone separator from the air inlet pipe, the airflow changes from linear motion into circular motion. The powder particles with density higher than that of the gas lose inertia force when contacting with the wall surface and fall along the wall surface, thereby separating the powder from the gas.

Further, in the step E, the coarse powder of the static powder concentrator is subjected to iron removal through a static iron separator, enters the double-shaft humidifying mixer again for humidifying and mixing, and then is subjected to the step C; and D, after iron is removed by the dynamic iron separator, the unqualified powder of the dynamic powder separator enters the double-shaft humidifying mixer again to be humidified and mixed, and then the step C is carried out, so that the steps of re-humidifying and mixing, rolling and the like are carried out, and the yield is improved.

In the step A, the steel slag generated in the steel-making process is subjected to early-stage hot braising, iron removal and crushing to obtain non-magnetic steel slag which does not contain large iron and has uniform particles, and the non-magnetic steel slag is taken as a raw material and is transported to a production plant area by an automobile to be placed into a steel slag bin.

In the step E, the fineness of the qualified fine powder particles is controlled by adjusting the air separation speed in the static powder concentrator.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, but such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.