阅读说明：本技术 一种水泥回转窑烧成带用微气孔镁铁铝尖晶石砖及其制备方法 (Micro-pore magnesia-hercynite brick for cement rotary kiln burning zone and preparation method thereof ) 是由 李沅锦 袁林 孟凌霄 王旭圆 张慧芳 王佳征 高洪兴 梁勤君 韩波 张亚权 于 2021-08-27 设计创作，主要内容包括：本发明涉及耐火材料技术领域,且公开了一种水泥回转窑烧成带用微气孔镁铁铝尖晶石砖,包括以下重量份数配比的原料：微孔高纯镁砂30～40％、电熔镁砂30～40％、电熔铁铝尖晶石5～10％、聚轻球1～2％、硅溶胶1～5％和工业锰粉1～2％,所述微孔高纯镁砂由5～3mm微孔高纯镁砂5～10％和3～1mm微孔高纯镁砂20～30％组成。该水泥回转窑烧成带用微气孔镁铁铝尖晶石砖及其制备方法,通过在混碾机中加入聚轻球,具有良好的耐火性能,高温强度高,热稳定性好,耐各种腐蚀,重烧纤变化小,导热系数小,在使用之后,大幅度降低镁铁铝尖晶砖的导热系数,从而降低水泥窑筒体温度,节省煤耗,降低大气污染,解决了导热系数较高、消耗大量煤的问题。(The invention relates to the technical field of refractory materials, and discloses a micro-pore magnesia-hercynite brick for a rotary cement kiln burning zone, which comprises the following raw materials in parts by weight: 30-40% of microporous high-purity magnesia, 30-40% of fused magnesia, 5-10% of fused hercynite, 1-2% of poly light ball, 1-5% of silica sol and 1-2% of industrial manganese powder, wherein the microporous high-purity magnesia consists of 5-3 mm of microporous high-purity magnesia 5-10% and 3-1 mm of microporous high-purity magnesia 20-30%. The micro-pore magnesia-hercynite brick for the cement rotary kiln burning zone and the preparation method thereof have the advantages that the light gathering balls are added into the mixing and grinding machine, the brick has good fire resistance, high-temperature strength, good thermal stability, various corrosion resistance, small change of re-burnt fiber and small heat conductivity coefficient, and after the brick is used, the heat conductivity coefficient of the magnesia-hercynite brick is greatly reduced, so that the temperature of a cement kiln barrel is reduced, the coal consumption is saved, the atmospheric pollution is reduced, and the problems of high heat conductivity coefficient and large coal consumption are solved.)

1. The micro-pore magnesia-hercynite brick for the burning zone of the rotary cement kiln is characterized by comprising the following raw materials in parts by weight: 30-40% of microporous high-purity magnesia, 30-40% of fused magnesia, 5-10% of fused hercynite, 1-2% of poly light ball, 1-5% of silica sol and 1-2% of industrial manganese powder.

2. The micro-pore magnesia-hercynite brick for the rotary cement kiln burning zone as claimed in claim 1, wherein the micro-pore high-purity magnesia consists of 5-10% of 5-3 mm micro-pore high-purity magnesia and 20-30% of 3-1 mm micro-pore high-purity magnesia.

3. The micro-pore magnesia-hercynite brick for the rotary cement kiln firing zone as claimed in claim 1, wherein the fused magnesia consists of 20-30% of 1-0 mm fused magnesia and 10-20% of 200 mesh fused magnesia.

4. The micro-porous maghemite brick for the rotary cement kiln burning zone as claimed in claim 1, wherein the poly light ball is 0.1 to 0.3 poly light particles, and the industrial manganese powder is 200 mesh manganese powder.

5. The micro-porous MgFe-Al spinel brick for the rotary cement kiln burning zone as claimed in claim 1, wherein the silica sol has a pH value of 9.0 to 10.5, a viscosity of 25mpa.s or less, and a specific gravity of 1.29 to 1.31.

6. A preparation method of a micro-pore magnesia-hercynite brick for a cement rotary kiln burning zone is characterized by comprising the following steps:

1) taking microporous high-purity magnesia, fused hercynite, industrial manganese powder, poly light balls and silica sol for later use;

2) crushing the micropore high-purity magnesia, and grading into two particle raw materials with different particle sizes of 5-3 mm and 3-1 mm for later use;

3) taking 30-40% of microporous high-purity magnesia, 30-40% of fused magnesia, 5-10% of fused hercynite, 1-2% of poly light ball, 1-5% of silica sol and 1-2% of industrial manganese powder according to weight percentage;

4) adding the microporous high-purity magnesia and the fused magnesia into a mixing mill, carrying out dry mixing for 3-5 min, then adding silica sol, continuing to carry out mixing milling for 5-10 min, finally adding the fused magnesia, the light polymer balls and the manganese powder, and carrying out mixing milling for 20min to obtain a pre-pressing material;

5) pressing and molding the pre-pressed material by a press to obtain a semi-finished product of the microporous magnesium-iron-aluminum spinel brick;

6) drying the semi-finished product in a drying hole at 100-120 ℃, wherein the residual dry water is less than 1%;

7) and (3) putting the dried qualified semi-finished product into a high-temperature tunnel kiln, firing at 1470-1480 ℃, and sorting the finished product according to the national standard.

Technical Field

The invention relates to the technical field of refractory materials, in particular to a micro-pore magnesia-hercynite brick for a rotary cement kiln burning zone and a preparation method thereof.

Background

At present, the dry-method cement rotary kiln is nearly 2000 in China, the average burning zone length is 20m, the amount of bricks used in the burning zone is more than 30 ten thousand tons every year, the bricks used in the burning zone mainly comprise a magnesia-chrome brick and a magnesia-hercynite brick, at present, the environment protection form is increasingly severe, the hexavalent chromium ions have carcinogenic risks, and the threat to the personal safety exists, so that the chromium-containing refractory material for the cement kiln exits from the historical stage and is basically and comprehensively replaced by the magnesia-hercynite brick, and the magnesia-hercynite brick is a chromium-free green product and also has good kiln skin sticking performance.

Chinese patent CN201410480173.8 proposes a magnesia carbon brick for the lining of an electric arc furnace and a manufacturing method thereof, high-temperature asphalt powder and anhydrous magnesium sulfate powder are added into raw materials at the same time, and the MgO-C brick is used, the melting loss rate of the refractory lining for the lining of the built electric arc furnace is lower, the ton steel consumption of refractory materials for the electric arc furnace can be obviously reduced, so that the service life of the electric arc furnace is longer, but the heat conductivity coefficient is higher, the temperature of a rotary kiln shell is higher, the energy-saving and heat-preservation are not favorable, the coal consumption is reduced, and the use is inconvenient, so the micro-pore magnesia-iron-aluminum spinel brick for a cement rotary kiln clinkering zone and the manufacturing method thereof are provided to solve the problems.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a micro-pore magnesia-hercynite brick for a rotary cement kiln burning zone and a preparation method thereof, which have the advantages of lower heat conductivity coefficient and coal consumption saving and solve the problems of higher heat conductivity coefficient and large coal consumption.

(II) technical scheme

In order to realize the purposes of lower heat conductivity coefficient and coal consumption saving, the invention provides the following technical scheme: a micro-pore magnesia-hercynite brick for a cement rotary kiln burning zone comprises the following raw materials in parts by weight: 30-40% of microporous high-purity magnesia, 30-40% of fused magnesia, 5-10% of fused hercynite, 1-2% of poly light ball, 1-5% of silica sol and 1-2% of industrial manganese powder.

Preferably, the micropore high-purity magnesite is composed of 5-10% of micropore high-purity magnesite of 5-3 mm and 20-30% of micropore high-purity magnesite of 3-1 mm.

Preferably, the fused magnesia consists of 20-30% of 1-0 mm fused magnesia and 10-20% of 200-mesh fused magnesia.

Preferably, the light gathering balls are light gathering particles of 0.1 to 0.3, and the industrial manganese powder is 200-mesh manganese powder.

Preferably, the pH value of the silica sol is 9.0 to 10.5, the viscosity of the silica sol is less than or equal to 25mpa.s, and the specific gravity of the silica sol is 1.29 to 1.31.

The invention aims to solve another technical problem of providing a preparation method of a micro-pore magnesia-hercynite brick for a rotary cement kiln burning zone, which comprises the following steps:

1) taking microporous high-purity magnesia, fused hercynite, industrial manganese powder, poly light balls and silica sol for later use;

2) crushing the micropore high-purity magnesia, and grading into two particle raw materials with different particle sizes of 5-3 mm and 3-1 mm for later use;

3) taking 30-40% of microporous high-purity magnesia, 30-40% of fused magnesia, 5-10% of fused hercynite, 1-2% of poly light ball, 1-5% of silica sol and 1-2% of industrial manganese powder according to weight percentage;

4) adding the microporous high-purity magnesia and the fused magnesia into a mixing mill, carrying out dry mixing for 3-5 min, then adding silica sol, continuing to carry out mixing milling for 5-10 min, finally adding the fused magnesia, the light polymer balls and the manganese powder, and carrying out mixing milling for 20min to obtain a pre-pressing material;

5) pressing and molding the pre-pressed material by a press to obtain a semi-finished product of the microporous magnesium-iron-aluminum spinel brick;

6) drying the semi-finished product in a drying hole at 100-120 ℃, wherein the residual dry water is less than 1%;

7) and (3) putting the dried qualified semi-finished product into a high-temperature tunnel kiln, firing at 1470-1480 ℃, and sorting the finished product according to the national standard.

(III) advantageous effects

Compared with the prior art, the invention provides a micro-pore magnesia-hercynite brick for a rotary cement kiln burning zone and a preparation method thereof, and the brick has the following beneficial effects:

1. the micro-pore magnesia-hercynite brick for the cement rotary kiln burning zone and the preparation method thereof have the advantages that the light gathering balls are added into the mixing and grinding machine, the brick has good fire resistance, high-temperature strength, good thermal stability, various corrosion resistance, small change of re-burnt fiber and small heat conductivity coefficient, and after the brick is used, the heat conductivity coefficient of the magnesia-hercynite brick is greatly reduced, so that the temperature of a cement kiln barrel is reduced, the coal consumption is saved, the atmospheric pollution is reduced, and the problems of high heat conductivity coefficient and large coal consumption are solved.

2. This cement rotary kiln is micropore magnesium hercynite brick for burning zone and preparation method thereof, through adding in mixing the machine of rolling with micropore high-purity magnesite and electric smelting magnesite, at the in-process of mixing rolling, the reduction heat conductivity of micropore high-purity magnesite, make the heat can not take place the conduction, can reduce and reduce cement kiln barrel temperature, it gives off to reduce cement rotary kiln heat energy, the consumption of the energy has been reduced, the capital environmental protection, reduce carbon dioxide emission simultaneously again, reduce the atmospheric pollution, the problem of coefficient of heat conductivity higher, consume a large amount of coal has been solved.

Drawings

FIG. 1 is a diagram illustrating the physical and chemical indexes of the present invention;

fig. 2 is a schematic diagram comparing the use effect of the magnesium-iron-aluminum spinel brick of the invention and the traditional magnesium-iron-aluminum spinel brick.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The first embodiment is as follows: a micro-pore magnesia-hercynite brick for a cement rotary kiln burning zone comprises the following raw materials in parts by weight: 30-40% of microporous high-purity magnesia, wherein the microporous high-purity magnesia consists of 5-10% of 5-3 mm microporous high-purity magnesia and 20-30% of 3-1 mm microporous high-purity magnesia, 30-40% of fused magnesia, the fused magnesia consists of 20-30% of 1-0 mm fused magnesia and 10-20% of 200-mesh fused magnesia, 5-10% of fused hercynite and 1-2% of poly light balls, the poly light balls are 0.1-0.3 poly light particles, the industrial manganese powder is 200-mesh manganese powder and 1-5% of silica sol, the pH value of the silica sol is 9.0-10.5, the viscosity of the silica sol is less than or equal to 25mpa.s, the specific gravity of the silica sol is 1.29-1.31, and the industrial manganese powder is 1-2%.

A preparation method of a micro-pore magnesia-hercynite brick for a cement rotary kiln burning zone comprises the following steps:

1) taking microporous high-purity magnesia, fused hercynite, industrial manganese powder, poly light balls and silica sol for later use;

2) crushing the micropore high-purity magnesia, and grading into two particle raw materials with different particle sizes of 5-3 mm and 3-1 mm for later use;

3) taking 30-40% of microporous high-purity magnesia, 30-40% of fused magnesia, 5-10% of fused hercynite, 1-2% of poly light ball, 1-5% of silica sol and 1-2% of industrial manganese powder according to weight percentage;

4) adding the microporous high-purity magnesia and the fused magnesia into a mixing mill, carrying out dry mixing for 3-5 min, then adding silica sol, continuing to carry out mixing milling for 5-10 min, finally adding the fused magnesia, the light polymer balls and the manganese powder, and carrying out mixing milling for 20min to obtain a pre-pressing material;

5) pressing and molding the pre-pressed material by a press to obtain a semi-finished product of the microporous magnesium-iron-aluminum spinel brick;

6) drying the semi-finished product in a drying hole at 100-120 ℃, wherein the residual dry water is less than 1%;

7) and (3) putting the dried qualified semi-finished product into a high-temperature tunnel kiln, firing at 1470-1480 ℃, and sorting the finished product according to the national standard.

Example two: a micro-pore magnesia-hercynite brick for a cement rotary kiln burning zone comprises the following raw materials in parts by weight: 30-40% of microporous high-purity magnesia, wherein the microporous high-purity magnesia consists of 5-10% of 5-3 mm microporous high-purity magnesia and 20-30% of 3-1 mm microporous high-purity magnesia, 30-40% of fused magnesia, the fused magnesia consists of 20-30% of 1-0 mm fused magnesia and 10-20% of 200-mesh fused magnesia, 5-10% of fused hercynite, 1-5% of industrial manganese powder and 1-5% of silica sol, the pH value of the silica sol is 9.0-10.5, the viscosity of the silica sol is less than or equal to 25mpa.s, the specific gravity of the silica sol is 1.29-1.31, and the industrial manganese powder is 1-2%.

A preparation method of a micro-pore magnesia-hercynite brick for a cement rotary kiln burning zone comprises the following steps:

1) taking microporous high-purity magnesia, fused hercynite, industrial manganese powder and silica sol for later use;

2) crushing the micropore high-purity magnesia, and grading into two particle raw materials with different particle sizes of 5-3 mm and 3-1 mm for later use;

3) taking 30-40% of microporous high-purity magnesia, 30-40% of fused magnesia, 5-10% of fused hercynite, 1-5% of silica sol and 1-2% of industrial manganese powder according to weight percentage;

4) adding the microporous high-purity magnesia and the fused magnesia into a mixing mill, carrying out dry mixing for 3-5 min, then adding silica sol, continuing to carry out mixing milling for 5-10 min, finally adding the fused magnesia and manganese powder, and carrying out mixing milling for 20min to obtain a pre-pressing material;

5) pressing and molding the pre-pressed material by a press to obtain a semi-finished product of the microporous magnesium-iron-aluminum spinel brick;

6) drying the semi-finished product in a drying hole at 100-120 ℃, wherein the residual dry water is less than 1%;

7) and (3) putting the dried qualified semi-finished product into a high-temperature tunnel kiln, firing at 1470-1480 ℃, and sorting the finished product according to the national standard.

Example three: a micro-pore magnesia-hercynite brick for a cement rotary kiln burning zone comprises the following raw materials in parts by weight: 30-40% of fused magnesia, wherein the fused magnesia consists of 20-30% of 1-0 mm fused magnesia and 10-20% of 200-mesh fused magnesia, 5-10% of fused hercynite and 1-2% of poly light spheres, the poly light spheres are 0.1-0.3 poly light particles, the industrial manganese powder is 200-mesh manganese powder and 1-5% of silica sol, the pH value of the silica sol is 9.0-10.5, the viscosity of the silica sol is less than or equal to 25mpa.s, the specific gravity of the silica sol is 1.29-1.31, and the industrial manganese powder is 1-2%.

A preparation method of a micro-pore magnesia-hercynite brick for a cement rotary kiln burning zone comprises the following steps:

1) taking fused magnesia, fused hercynite, industrial manganese powder, poly light balls and silica sol for later use;

2) taking 30-40% of fused magnesia, 5-10% of fused hercynite, 1-2% of poly light ball, 1-5% of sol and 1-2% of industrial manganese powder according to weight percentage;

3) adding the fused magnesia into a mixing mill, carrying out dry mixing for 3-5 min, then adding silica sol, continuing to carry out mixing milling for 5-10 min, finally adding the fused magnesia, the light polymer balls and the manganese powder, and carrying out mixing milling for 20min to obtain a pre-pressing material;

4) pressing and molding the pre-pressed material by a press to obtain a semi-finished product of the microporous magnesium-iron-aluminum spinel brick;

5) drying the semi-finished product in a drying hole at 100-120 ℃, wherein the residual dry water is less than 1%;

6) and (3) putting the dried qualified semi-finished product into a high-temperature tunnel kiln, firing at 1470-1480 ℃, and sorting the finished product according to the national standard.

The invention has the beneficial effects that: the micro-porous magnesia-hercynite brick for the cement rotary kiln burning zone and the preparation method thereof have the advantages that the light gathering balls are added into the mixing mill, the brick has good fire resistance, high-temperature strength, good thermal stability, various corrosion resistances, small change of re-burning fibers and small heat conductivity coefficient, after the brick is used, the heat conductivity coefficient of the magnesium-iron-aluminum spinel brick is greatly reduced, thereby reducing the temperature of a cement kiln cylinder, saving coal consumption and reducing atmospheric pollution, microporous high-purity magnesia and electric smelting magnesia are added into a mixing mill, in the mixing and grinding process, the heat conductivity of the microporous high-purity magnesia is reduced, so that heat cannot be conducted, the temperature of a cement kiln barrel can be reduced, the heat emission of a cement rotary kiln is reduced, the energy consumption is reduced, the material is environment-friendly, meanwhile, the emission of carbon dioxide is reduced, the atmospheric pollution is reduced, and the problems of high heat conductivity coefficient and large coal consumption are solved.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.