White aluminate cement with ultrahigh whiteness and preparation method thereof
阅读说明：本技术 超高白度白色铝酸盐水泥及其制备方法 (White aluminate cement with ultrahigh whiteness and preparation method thereof ) 是由 朱杰 王振 黄少文 曾嵘 鄢定英 李远华 张�荣 吴飞龙 于 2021-09-26 设计创作，主要内容包括：本发明涉及特种水泥技术领域,提供一种超高白度白色铝酸盐水泥及其制备方法。传统的铝酸盐水泥受到原料和工艺的限制,产品白度较低(通常在50～65度),难以满足装饰材料的白度要求。本发明采用石灰质原料和铝质原料配料,磨细制成生料后,压片在高温炉(实验室条件)或生料粉喂入回转窑采用石油焦和生物质复合燃料(工业生产条件)煅烧一定时间,出窑(炉)熟料经冷却到100℃以下,得到铝酸盐熟料,将铝酸盐熟料直接粉磨到一定细度,得到超高白度白色硫铝酸盐水泥。(The invention relates to the technical field of special cement, and provides white aluminate cement with ultrahigh whiteness and a preparation method thereof. The traditional aluminate cement is limited by raw materials and processes, the whiteness of the product is low (usually 50-65 ℃), and the whiteness requirement of the decorative material is difficult to meet. The invention adopts the ingredients of calcareous raw materials and aluminium raw materials, after the materials are ground into raw materials, the raw materials are pressed into tablets in a high temperature furnace (laboratory condition) or raw material powder is fed into a rotary kiln to be calcined for a certain time by adopting petroleum coke and biomass composite fuel (industrial production condition), the clinker discharged from the kiln (furnace) is cooled to be below 100 ℃ to obtain aluminate clinker, and the aluminate clinker is directly ground to a certain fineness to obtain white sulphoaluminate cement with ultrahigh whiteness.)
1. The preparation method of the white aluminate cement with ultrahigh whiteness is characterized by comprising the following steps:
s1, metering and matching the calcareous raw material and the aluminum raw material, and grinding to obtain a raw material;
s2, calcining the raw material at high temperature to obtain laboratory preparation clinker or industrial production clinker;
s3, cooling the clinker prepared in the laboratory or the clinker produced in the industrial production to be below 100 ℃ to obtain aluminate clinker;
s4, grinding the aluminate clinker to obtain white aluminate cement with ultrahigh whiteness; or grinding the aluminate clinker, the calcined alumina and the set regulating agent to obtain the white aluminate cement with ultrahigh whiteness.
2. The method for preparing ultra-high whiteness white aluminate cement according to claim 1, wherein the method comprises the following steps:
in the step S1, the mixture ratio of the calcareous material and the aluminum material is as follows:
30-45% of calcareous raw materials and 50-70% of aluminum raw materials;
wherein the calcareous raw material comprises one or more of limestone, chalk, shells, carbide slag and quick lime;
the aluminum raw material comprises one or more of aluminum oxide, aluminum hydroxide and aluminum ash.
3. The method for preparing ultra-high whiteness white aluminate cement according to claim 1 or 2, characterized in that:
in the step S1, the calcareous material and the aluminum material are weighed, matched and ground into powder until the fineness is 80 mu m and the screen residue of a square-hole screen is less than or equal to 10 percent.
4. The method for preparing ultra-high whiteness white aluminate cement according to claim 1, wherein the method comprises the following steps:
in step S2, the specific method of high-temperature calcination includes:
under the condition of a laboratory, the raw material is pressed and molded, and is placed into a high-temperature furnace and calcined under the environment of 1400-1550 ℃ to obtain laboratory preparation clinker, and the calcination time is 30-40 min;
under the condition of industrial production, the raw material is directly fed into a rotary kiln and calcined under the environment of 1500 +/-50 ℃, and the rotary speed of the rotary kiln is controlled for 0.8-1.8 min to obtain the industrial production clinker.
5. The method for preparing ultra-high whiteness white aluminate cement according to claim 4, wherein the method comprises the following steps:
under industrial production conditions, the fuel adopted by high-temperature calcination comprises one or more of petroleum coke, biomass fuel, heavy oil, anthracite and bituminous coal.
6. The method for preparing ultra-high whiteness white aluminate cement according to claim 1, wherein the method comprises the following steps:
in step S3, the specific method for cooling the kiln exit clinker includes cooling the kiln exit clinker by using a cooler.
7. The method for preparing ultra-high whiteness white aluminate cement according to claim 1, wherein the method comprises the following steps:
in the step S4, the mixture ratio of aluminate clinker, calcined alumina and coagulation regulator is as follows:
90-100% of aluminate clinker, 0-10% of calcined alumina and 0-2% of a coagulation regulator;
wherein the set retarder comprises a retarder and a set accelerator;
the retarder comprises NaCl, KCl and NaNO3One or more of tartaric acid, citric acid, molasses and the like;
said coagulant comprises Ca (OH)2、NaOH、Na2CO3And NaSO4One or more of (a) and (b).
8. The method for preparing ultra-high whiteness white aluminate cement according to claim 1 or 7, characterized in that:
in the step S4, the aluminate clinker is ground until the specific surface area is 350-500 m2Per kg; or grinding the aluminate clinker, the calcined alumina and the coagulation regulator until the specific surface area is 350-500 m2/kg。
9. An ultra-high whiteness white aluminate cement produced by the method of any one of claims 1 to 8, characterized in that:
the aluminate cement comprises aluminate clinker;
or the aluminate cement comprises aluminate clinker, calcined alumina and a coagulation regulator, wherein the aluminate clinker, the calcined alumina and the coagulation regulator are mixed according to the following ratio:
90-100% of aluminate clinker, 0-10% of calcined alumina and 0-2% of a coagulation regulator;
wherein the set retarder comprises a retarder and a set accelerator;
the retarder comprises NaCl, KCl and NaNO3One or more of tartaric acid, citric acid, molasses and the like;
the promotion ofThe coagulant comprises Ca (OH)2、NaOH、Na2CO3And NaSO4One or more of (a) and (b).
10. The ultra-high whiteness white aluminate cement of claim 9, wherein the aluminate clinker is prepared from a raw meal comprising the following components in the following proportions:
30-45% of calcareous raw materials and 50-70% of aluminum raw materials;
wherein the calcareous raw material comprises one or more of limestone, chalk, shells, carbide slag and quick lime;
the aluminum raw material comprises one or more of aluminum oxide, aluminum hydroxide and aluminum ash.
Technical Field
The invention relates to the technical field of special cement, and particularly provides white aluminate cement with ultrahigh whiteness and a preparation method thereof
Background
The aluminate cement is a hydraulic cementing material prepared by grinding aluminate cement clinker taking calcium aluminate (CA, CA2) as a main mineral phase. The aluminate cement is a special cementing material with the characteristics of quick hardening, early strength, fire resistance and low alkali, and is mainly applied to rush repair engineering, preparation of refractory concrete and refractory castable. The aluminate expansive cement and the self-stress cement can be prepared by mixing gypsum; the flocculant can be prepared into polyaluminium chloride and polyaluminium sulfate by adding a proper amount of hydrochloric acid and sulfuric acid, and is widely applied to industrial wastewater treatment.
The international aluminate cement is also a common building decoration material, and is mainly applied to building decoration plaster, tile adhesive, floor material, repairing material and inorganic artificial stone. The application trend is introduced into the domestic market in recent years, and the aluminate cement has the advantages of high early strength, short construction period, good color decoration and less efflorescence when being used for preparing building decoration materials such as white and colored plaster, colored decoration mortar, inorganic artificial stone and floor mortar by utilizing the quick hardening early strength and low alkali characteristics of the aluminate cement. However, the traditional aluminate cement is limited by raw materials and processes, the whiteness of the product is low (usually 50-65 ℃), and the whiteness requirement of the decorative material is difficult to meet.
The invention patent applied by Jiahua special cement corporation: the main invention of a modified aluminate cement (application publication No. CN106517968A) is that phosphate, micro-silicon and slag are added into aluminate cement to prevent the hydration product from generating C3AH6 to prevent strength from shrinking. The invention patent applied by Delaier building materials science and technology Co., Ltd, Suzhou: a process for preparing aluminate cement (application publication No. CN104788031A) features that the barium dregs, nickel silicate tailings, red mud, steel slag and gypsum are added to the clinker of aluminate cement to prepare aluminate cement. The invention patent applied by Wuhan university of science and technology: the magnesium aluminate spinel containing aluminate cement is prepared with industrial alumina 60-72 wt%, heavy calcium carbonate 13-25 wt% and light burnt magnesia 8-21 wt%, and through grinding, sintering in a high temperature furnace at 1200-1550 deg.c for 120-240 min, and grinding the sintered material.
However, the above patents all design the white aluminate cement to improve the whiteness, and cannot meet the market demand for higher and higher whiteness.
Disclosure of Invention
The invention aims to provide a preparation method of white aluminate cement with ultrahigh whiteness, and aims to solve the problems that the existing white aluminate cement has low whiteness and cannot meet the whiteness index requirement of building decoration materials.
In order to achieve the purpose, the invention adopts the technical scheme that:
in a first aspect, the invention provides a preparation method of white aluminate cement with ultrahigh whiteness, which comprises the following steps:
s1, metering and matching the calcareous raw material and the aluminum raw material, and grinding the mixture to a certain fineness to obtain a raw material;
s2, calcining the raw material at high temperature to obtain laboratory preparation clinker or industrial production clinker;
s3, cooling the clinker prepared in the laboratory or the clinker produced in the industrial production to be below 100 ℃ to obtain aluminate clinker;
s4, grinding the aluminate clinker to obtain white aluminate cement with ultrahigh whiteness; or grinding the aluminate clinker, the calcined alumina and the set regulating agent to obtain the white aluminate cement with ultrahigh whiteness.
Advantages of the inventionThe effect is as follows: the method comprises the steps of grinding a calcareous raw material and an aluminum raw material to obtain a raw material, calcining the raw material at a high temperature to obtain laboratory preparation clinker or industrial production clinker, cooling the laboratory preparation clinker or the industrial production clinker to below 100 ℃ to obtain aluminate clinker, and finally grinding the aluminate clinker to obtain the white aluminate cement with ultrahigh whiteness. The invention only adopts the calcareous raw material and the aluminum raw material to grind to form the raw material, does not adopt the silicon-aluminum raw material, prevents the iron oxide from being brought into the raw material to reduce the whiteness of the product, and simultaneously prevents the dicalcium aluminosilicate (C) from appearing in the clinker2AS) reduces product strength.
Preferably, in the step S1, the mixture ratio of the calcareous material and the aluminum material is as follows:
30-45% of calcareous raw materials and 50-70% of aluminum raw materials;
wherein the calcareous raw material comprises one or more of limestone, chalk, shells, carbide slag and quick lime;
the aluminum raw material comprises one or more of aluminum oxide, aluminum hydroxide and aluminum ash.
Preferably, in the step S1, the calcareous material and the aluminium material are weighed, mixed and ground into a 80 μm square-hole sieve with a sieve residue of less than or equal to 10%.
The grinding equipment comprises: laboratory conditions were followed by experimental vibration mills (tungsten carbide bowls), and production conditions were followed by ball mills, roller mills, rod mills and extruders.
Preferably, in the step S2, the specific method of high-temperature calcination includes,
under the condition of a laboratory, the raw material is pressed and molded, and is placed into a high-temperature furnace and calcined under the environment of 1400-1550 ℃ to obtain laboratory preparation clinker, and the calcination time is 30-40 min;
under the condition of industrial production, the raw material is directly fed into a rotary kiln and calcined at the temperature of 1500 +/-50 ℃, and the rotary speed of the rotary kiln is controlled for 0.8-1.8 min to obtain the industrial production clinker.
Preferably, under industrial production conditions, the fuel used for high-temperature calcination comprises one or more of petroleum coke, biomass fuel, heavy oil, anthracite and bituminous coal.
Preferably, in the step S3, the specific method for cooling the laboratory preparation clinker or the industrial production clinker includes cooling the laboratory preparation clinker or the industrial production clinker by using a cooling machine, where the cooling machine includes a grate cooler and a single-cylinder cooler.
Preferably, in step S4, the mixing ratio of the aluminate clinker, the calcined alumina and the coagulation regulator is as follows:
90-100% of aluminate clinker, 0-10% of calcined alumina and 0-2% of a coagulation regulator;
wherein the set retarder comprises a retarder and a set accelerator;
the retarder comprises NaCl, KCl and NaNO3One or more of tartaric acid, citric acid, molasses and the like;
said coagulant comprises Ca (OH)2、NaOH、Na2CO3And NaSO4One or more of (a) and (b).
Preferably, in the step S4, the aluminate clinker is ground to have a specific surface area of 350-500 m2Per kg; or grinding the aluminate clinker, the calcined alumina and the coagulation regulator until the specific surface area is 350-500 m2/kg。
In a second aspect, the present application also provides an ultrahigh-whiteness white aluminate cement prepared by the preparation method of the ultrahigh-whiteness white aluminate cement,
the aluminate cement comprises aluminate clinker;
or the aluminate cement comprises aluminate clinker, calcined alumina and a coagulation regulator, wherein the aluminate clinker, the calcined alumina and the coagulation regulator are mixed according to the following ratio:
90-100% of aluminate clinker, 0-10% of calcined alumina and 0-2% of a coagulation regulator;
wherein the set retarder comprises a retarder and a set accelerator;
the retarder comprises NaCl, KCl and NaNO3Tartaric acid, citric acid, molasses and the likeOr a plurality of compounds;
said coagulant comprises Ca (OH)2、NaOH、Na2CO3And NaSO4One or more of (a) and (b).
Preferably, the aluminum hydrochloric acid clinker is prepared from a raw material, and the raw material comprises the following components in parts by weight:
30-45% of calcareous raw materials and 50-70% of aluminum raw materials;
wherein the calcareous raw material comprises one or more of limestone, chalk, shells, carbide slag and quick lime;
the aluminum raw material comprises one or more of aluminum oxide, aluminum hydroxide and aluminum ash.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a flow chart of a preparation process of a method for preparing white aluminate cement with ultra-high whiteness according to an embodiment of the present invention;
FIG. 2 is a flow chart of a preparation process of ultra-high whiteness white aluminate cement under laboratory conditions according to an embodiment of the present invention;
FIG. 3 is a flow chart of a product preparation process of the white aluminate cement with ultra-high whiteness provided by the embodiment of the invention under industrial production conditions.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The aluminate cement is a hydraulic cementing material prepared by grinding aluminate cement clinker taking calcium aluminate (CA, CA2) as a main mineral phase. The aluminate cement is a special cementing material with the characteristics of quick hardening, early strength, fire resistance and low alkali, and is mainly applied to rush repair engineering, preparation of refractory concrete and refractory castable. The aluminate expansive cement and the self-stress cement can be prepared by mixing gypsum; the flocculant can be prepared into polyaluminium chloride and polyaluminium sulfate by adding a proper amount of hydrochloric acid and sulfuric acid, and is widely applied to industrial wastewater treatment.
The international aluminate cement is also a common building decoration material, and is mainly applied to building decoration plaster, tile adhesive, floor material, repairing material and inorganic artificial stone. The application trend is introduced into the domestic market in recent years, and the aluminate cement has the advantages of high early strength, short construction period, good color decoration and less efflorescence when being used for preparing building decoration materials such as white and colored plaster, colored decoration mortar, inorganic artificial stone and floor mortar by utilizing the quick hardening early strength and low alkali characteristics of the aluminate cement. However, the traditional aluminate cement is limited by raw materials and processes, the whiteness of the product is low (usually 50-65 ℃), and the whiteness requirement of the decorative material is difficult to meet.
Referring to fig. 1 to 3, in order to solve the above technical problems, in a first aspect, the present invention provides a method for preparing white aluminate cement with ultra-high whiteness, the method comprising the following steps:
s1, metering and matching the calcareous raw material and the aluminum raw material, and grinding to obtain a raw material;
s2, calcining the raw material at high temperature to obtain laboratory preparation clinker or industrial production clinker;
s3, cooling the clinker prepared in the laboratory or the clinker produced in the industrial production to be below 100 ℃ to obtain aluminate clinker;
s4, grinding the aluminate clinker to obtain white aluminate cement with ultrahigh whiteness; or grinding the aluminate clinker, the calcined alumina and the set regulating agent to obtain the white aluminate cement with ultrahigh whiteness.
The method comprises the steps of grinding a calcareous raw material and an aluminum raw material to obtain a raw material, calcining the raw material at a high temperature to obtain laboratory preparation clinker or industrial production clinker, cooling the laboratory preparation clinker or the industrial production clinker to below 100 ℃ to obtain aluminate clinker, and finally grinding the aluminate clinker to obtain the white aluminate cement with ultrahigh whiteness. The invention only adopts the calcareous raw material and the aluminum raw material to grind to form the raw material, does not adopt the silicon-aluminum raw material, prevents the iron oxide from being brought into the raw material to reduce the whiteness of the product, and simultaneously prevents the dicalcium aluminosilicate (C) from appearing in the clinker2AS) reduces product strength.
Preferably, in the step S1, the mixture ratio of the calcareous material and the aluminum material is as follows:
30-45% of calcareous raw materials and 50-70% of aluminum raw materials;
wherein the calcareous raw material comprises one or more of limestone, chalk, shells, carbide slag and quick lime;
the aluminum raw material comprises one or more of aluminum oxide, aluminum hydroxide and aluminum ash.
Preferably, in the step S1, the calcareous material and the aluminium material are weighed, mixed and ground into a 80 μm square-hole sieve with a sieve residue of less than or equal to 10%. Wherein, under the condition of a laboratory, an experimental vibration mill (a tungsten carbide material bowl) is adopted for grinding; under the production condition, a ball mill, a roller mill, a rod mill and an extruder are adopted for grinding.
Preferably, in the step S2, the specific method of high-temperature calcination includes,
and (2) under the laboratory condition, pressing and molding the raw material, and putting the raw material into a high-temperature furnace to calcine the raw material at 1400-1550 ℃ to obtain the laboratory prepared clinker, wherein the calcining time is 30-40 min. Specifically, the raw materials are pressed into cylinders with phi 30mm multiplied by 20mm by a tablet press, and the high-temperature furnace is a silicon-molybdenum rod high-temperature furnace.
Under the condition of industrial production, the raw material is directly fed into a rotary kiln and calcined under the environment of 1500 +/-50 ℃, the rotary speed of the rotary kiln is controlled to be 0.8-1.8 r/min, the industrial production clinker is obtained, and the calcination time is 30-60 min.
Preferably, under industrial production conditions, the fuel used for high-temperature calcination comprises one or more of petroleum coke, biomass fuel, heavy oil, anthracite and bituminous coal.
Preferably, in the step S3, the specific method for cooling the laboratory preparation clinker or the industrial production clinker includes cooling the laboratory preparation clinker or the industrial production clinker by using a cooling machine.
Preferably, in step S4, the mixing ratio of the aluminate clinker, the calcined alumina and the coagulation regulator is as follows:
90-100% of aluminate clinker, 0-10% of calcined alumina and 0-2% of a coagulation regulator;
wherein the set retarder comprises a retarder and a set accelerator;
the retarder comprises NaCl, KCl and NaNO3One or more of tartaric acid, citric acid, molasses and the like;
said coagulant comprises Ca (OH)2、NaOH、Na2CO3And NaSO4One or more of (a) and (b).
Preferably, in the step S4, the aluminate clinker is ground to have a specific surface area of 350-500 m2Per kg; or grinding the aluminate clinker, the calcined alumina and the coagulation regulator until the specific surface area is 350-500 m2/kg。
In a second aspect, the present application also provides an ultrahigh-whiteness white aluminate cement prepared by the preparation method of the ultrahigh-whiteness white aluminate cement,
the aluminate cement comprises aluminate clinker;
or the aluminate cement comprises aluminate clinker, calcined alumina and a coagulation regulator, wherein the aluminate clinker, the calcined alumina and the coagulation regulator are mixed according to the following ratio:
90-100% of aluminate clinker, 0-10% of calcined alumina and 0-2% of a coagulation regulator;
wherein the set retarder comprises a retarder and a set accelerator;
the retarder comprises NaCl, KCl and NaNO3One or more of tartaric acid, citric acid, molasses and the like;
said coagulant comprises Ca (OH)2、NaOH、Na2CO3And NaSO4One or more of (a) and (b).
Preferably, the aluminate clinker is prepared from a raw material, wherein the raw material comprises the following components in parts by weight:
30-45% of calcareous raw materials and 50-70% of aluminum raw materials;
wherein the calcareous raw material comprises one or more of limestone, chalk, shells, carbide slag and quick lime;
the aluminum raw material comprises one or more of aluminum oxide, aluminum hydroxide and aluminum ash.
Example 1
In this embodiment, the present invention provides a method for preparing white aluminate cement with ultra-high whiteness, which is performed under laboratory conditions, and the method includes the following steps:
s1, metering and proportioning the calcareous raw material and the aluminum raw material according to the following proportioning ratio: 42.9 percent of limestone and 57.1 percent of alumina. The raw materials are weighed and matched, and then ground until the screen residue of a square-hole sieve with the size of 80 mu m is less than or equal to 10 percent to prepare raw materials.
S2, pressing the raw materials into cylinders with phi 30mm multiplied by 20mm by a tablet press, and putting the cylinders into a silicon-molybdenum rod high-temperature furnace to calcine for 30min at 1550 ℃ to obtain the laboratory prepared clinker.
And S3, cooling the clinker prepared in the laboratory, and naturally cooling to below 100 ℃ to obtain the aluminate clinker.
S4, directly grinding the sintered aluminate clinker in an experimental vibration mill until the specific surface area is more than 420m2And/kg, the ultrahigh-whiteness aluminate cement is obtained.
Example 2
In this embodiment, the present invention provides a method for preparing white aluminate cement with ultra-high whiteness, which is performed under laboratory conditions, and the method includes the following steps:
s1, metering and proportioning the calcareous raw material and the aluminum raw material according to the following proportioning ratio: 32.8 percent of limestone and 67.2 percent of aluminum hydroxide. The raw materials are weighed and matched, and then ground until the screen residue of a square-hole sieve with the size of 80 mu m is less than or equal to 10 percent to prepare raw materials.
S2, pressing the raw materials into cylinders with phi 30mm multiplied by 20mm by a tablet press, and putting the cylinders into a silicon-molybdenum rod high-temperature furnace to calcine for 30min at 1500 ℃ to obtain the laboratory prepared clinker.
And S3, cooling the clinker prepared in the laboratory, and naturally cooling to below 100 ℃ to obtain the aluminate clinker.
S4, sintering the aluminateThe clinker is directly ground in an experimental vibration mill until the specific surface area is more than 420m2And/kg, the ultrahigh-whiteness aluminate cement is obtained.
Example 3
In this embodiment, the present invention provides a method for preparing white aluminate cement with ultra-high whiteness, which is performed under laboratory conditions, and the method includes the following steps:
s1, metering and proportioning the calcareous raw material and the aluminum raw material according to the following proportioning ratio: 44.5 percent of limestone and 55.5 percent of alumina. The raw materials are weighed and matched, and then ground until the screen residue of a square-hole sieve with the size of 80 mu m is less than or equal to 10 percent to prepare raw materials.
S2, pressing the raw materials into cylinders with phi 30mm multiplied by 20mm by a tablet press, and putting the cylinders into a silicon-molybdenum rod high-temperature furnace to calcine for 30min at 1500 ℃ to obtain the laboratory prepared clinker.
And S3, cooling the clinker prepared in the laboratory, and cooling to below 100 ℃ by air blowing to obtain the aluminate clinker.
S4, directly grinding the sintered aluminate clinker in an experimental vibration mill until the specific surface area is more than 420m2And/kg, the ultrahigh-whiteness aluminate cement is obtained.
Example 4
In this embodiment, the present invention provides a method for preparing white aluminate cement with ultra-high whiteness, which is performed under laboratory conditions, and the method includes the following steps:
s1, metering and proportioning the calcareous raw material and the aluminum raw material according to the following proportioning ratio: 32.6 percent of limestone and 67.4 percent of aluminum hydroxide. The raw materials are weighed and matched, and then ground until the screen residue of a square-hole sieve with the size of 80 mu m is less than or equal to 10 percent to prepare raw materials.
S2, pressing the raw materials into cylinders with phi 30mm multiplied by 20mm by a tablet press, and putting the cylinders into a silicon-molybdenum rod high-temperature furnace to calcine for 30min at 1500 ℃ to obtain the laboratory prepared clinker.
And S3, cooling the clinker prepared in the laboratory, and cooling to below 100 ℃ by air blowing to obtain the aluminate clinker.
S4, directly grinding the sintered aluminate clinker into specific surface in an experimental vibration millProduct is larger than 420m2And/kg, the ultrahigh-whiteness aluminate cement is obtained.
Example 5
In this embodiment, the present invention provides a method for preparing white aluminate cement with ultra-high whiteness, which is performed under laboratory conditions, and the method includes the following steps:
s1, metering and proportioning the calcareous raw material and the aluminum raw material according to the following proportioning ratio: 32.6 percent of limestone and 67.4 percent of aluminum hydroxide. The raw materials are weighed and matched, and then ground until the screen residue of a square-hole sieve with the size of 80 mu m is less than or equal to 10 percent to prepare raw materials.
S2, pressing the raw materials into cylinders with phi 30mm multiplied by 20mm by a tablet press, and putting the cylinders into a silicon-molybdenum rod high-temperature furnace to calcine for 30min at 1550 ℃ to obtain the laboratory prepared clinker.
And S3, cooling the clinker prepared in the laboratory, and cooling to below 100 ℃ by air blowing to obtain the aluminate clinker.
S4, directly grinding the sintered aluminate clinker in an experimental vibration mill until the specific surface area is more than 420m2And/kg, the ultrahigh-whiteness aluminate cement is obtained.
Example 6
In this embodiment, the present invention provides a method for preparing white aluminate cement with ultrahigh whiteness, which is performed under industrial production conditions, and the method includes the following steps:
s1, metering and proportioning the calcareous raw material and the aluminum raw material according to the following proportioning ratio: 33.3 percent of limestone and 66.7 percent of aluminum hydroxide. The raw materials are weighed and matched, and then ground until the screen residue of a square-hole sieve with the size of 80 mu m is less than or equal to 10 percent to prepare raw materials.
S2, feeding the raw material into a rotary kiln with a phi 2.7 x 42m and a five-stage cyclone preheater to calcine to obtain industrial production clinker (or called kiln clinker), wherein the clinker calcination adopts petroleum coke and biomass fuel (rice hull) to combine into composite fuel, and the mixing ratio of the two fuels is as follows: petroleum coke and rice husk in the ratio of 8 to 2. The temperature of the high-temperature zone is controlled to be 1500 +/-50 ℃, and the rotating speed of the rotary kiln is controlled to be 1.3-1.8 r/min.
And S3, cooling the clinker discharged from the kiln, and cooling to below 100 ℃ by adopting a single-cylinder cooler to obtain the aluminate clinker.
S4, directly grinding the sintered aluminate clinker in an experimental vibration mill until the specific surface area is more than 420m2And/kg, the ultrahigh-whiteness aluminate cement is obtained.
Wherein, the mineral composition of the aluminate clinker fired by the six examples is quantitatively analyzed by XRD-Rietveld full-spectrum fitting, and the result is shown in Table 1. The performance indexes of the ultrahigh whiteness aluminate cement prepared by the six examples are shown in Table 2.
TABLE 1.6 mineral composition of example aluminate Clinkers
CA/％
CA2/％
Al2O3/％
C12A7/％
Amorphous phase/%)
Example 1
39.3
30.7
5.7
1.0
23.3
Example 2
54.1
25.4
5.3
3.2
12.0
Example 3
40.1
23.5
8.5
4.1
23.8
Example 4
54.2
28.3
4.8
2.7
10.0
Example 5
43.3
31.0
2.0
0
23.7
Example 6
54.4
34.6
0.2
0
10.8
TABLE 2.6 Properties of the ultra high whiteness aluminate cements of the examples
Remarking: whiteness measurements the resultant hunter whiteness was measured according to the provisions of GB/T2015-2017, appendix a.
The setting time is measured according to the GB/T1346 specification, and the compressive strength is measured according to the GB/T17671 specification.
In conclusion, the whiteness of the aluminate cement prepared by the preparation method of the white aluminate cement with ultrahigh whiteness provided by the invention is over 90 percent, and the blank in the technical aspect of the white aluminate cement with ultrahigh whiteness in China is filled so as to meet the demand of the market on the ultrahigh whiteness.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
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