CN110734275A - low-silicon-chromium corundum composite brick and preparation method thereof - Google Patents
low-silicon-chromium corundum composite brick and preparation method thereof Download PDFInfo
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- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
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Abstract
The invention relates to the technical field of refractory materials, and particularly provides low-silicon-chromium corundum composite bricks and a preparation method thereof, wherein the low-silicon-chromium corundum composite bricks are prepared from fused white corundum, tabular corundum, fused chromium oxide, desilicated zirconium, alumina ultrafine powder and a bonding agent according to the following percentage, wherein the fused white corundum is 5-3mm and 8-12% in granularity, 3-1mm and 15-23% in granularity, 1-0mm and 5-8% in granularity<0.074mm, 12-30%; plate corundum: the granularity is 3-1mm, 7-11%; the granularity is 1-0mm, 5-10%; particle size<0.074mm, 12-19%; electric melting chromic oxide: the granularity is 1-0mm, 7-12%; particle size<0.074mm, 3-9%; desiliconizing zirconium: particle size<0.074mm, 2-8%; alumina ultrafine powder: particle size<0.001mm, 2-6 percent and 3-6 percent of additional bonding agent. The invention has the advantages that the low silicon-chromium corundum composite brick is SiO2Less than 1 percent, solves the problem that the chromium corundum brick resists the corrosion of weak alkali atmosphere, and greatly prolongs the service life of the kiln.
Description
Technical Field
The invention relates to the technical field of refractory materials, in particular to low-silicon-chromium corundum composite bricks and a preparation method thereof.
Background
With the development of high-temperature industry, the requirements on refractory materials are more and more strict, and energy conservation, environmental protection, long service life and the like are the directions for improving the refractory materials.
The chromium corundum brick is widely applied to high-temperature kilns with strict anti-corrosion requirements such as garbage treatment and nonferrous smelting, has great effects on corrosion and abrasion resistance in a weak acid atmosphere due to strong anti-corrosion capability and high-temperature rupture strength, but cannot meet the requirements on corrosion resistance of a weak base , has generally short service life in a complex material environment, needs a durable lining to prolong the service life and improve the utilization rate in the current dangerous waste treatment kiln, solves the problem of application range of the chromium corundum brick, and is of the current main problems.
Disclosure of Invention
The invention aims to provide low-silicon-chromium corundum composite bricks and a preparation method thereof, wherein the low-silicon-chromium corundum composite bricks are SiO2Less than 1 percent, solves the problem that the chromium corundum brick resists the corrosion of weak alkali atmosphere, and greatly prolongs the service life of the kiln.
The invention adopts the technical scheme that low-silicon-chromium corundum composite bricks are prepared from electro-fused white corundum, tabular corundum, electro-fused chromium oxide, desiliconized zirconium, alumina ultrafine powder and a binding agent according to the following percentage:
electric melting white corundum: 8-12% of granularity 5-3 mm;
15-23% of granularity 3-1 mm;
5-8% of granularity 1-0 mm;
12-30% of granularity less than 0.074 mm;
plate corundum: 7-11% of granularity 3-1 mm;
5-10% of granularity 1-0 mm;
12-19% of granularity less than 0.074 mm;
electric melting chromic oxide: 7-12% of granularity 1-0 mm;
the granularity is less than 0.074mm and 3-9 percent;
desiliconizing zirconium: the granularity is less than 0.074mm 2-8%;
alumina ultrafine powder: the granularity is less than 0.001mm 2-6%;
the sum of the weight percentages of the components is 100 percent,
in addition, a binding agent is added, the weight of the binding agent is 3-6% of the total weight of the components, and the binding agent consists of 42-61% of industrial phosphoric acid with the concentration of 85%, 20-40% of water and 33-47% of aluminum hydroxide powder.
Preferably, Al in the fused white corundum2O3Not less than 99.5%, Fe2O3Not higher than 0.5%.
Preferably, Al in the plate-shaped corundum2O3Not less than 99.5%, Fe2O3Not higher than 0.3%.
Preferably, the electrofused chromium oxide contains Cr2O3Not less than 99.5%, Fe2O3Not higher than 0.3%.
Preferably, ZrO in the desilicated zirconium2Not less than 95% of Fe2O3Not higher than 0.5%.
Preferably, the alumina ultrafine powder Al2O3Not less than 99.5%, Fe2O3Not higher than 0.2%.
Preferably, the binding agent consists of 42-47% of industrial phosphoric acid with the concentration of 85%, 20-25% of water and 33-38% of aluminum hydroxide powder.
The preparation method of kinds of low-silicon chromium corundum composite bricks comprises the following steps:
(1) mixing: mixing 2/3 binder, fused white corundum powder, tabular corundum powder, desiliconized zirconium powder and alumina ultrafine powder, adding into a forced mixer, mixing for 1-3min, and then continuing to add the rest 1/3 binder into the forced mixer, mixing for 2-3 min;
(2) molding: performing hydraulic forming on the mixed material in the step (1) into a green brick by adopting a 1250-ton hydraulic press;
(3) and (3) drying: placing the green bricks formed in the step (2) into a tunnel drying kiln for drying, wherein the inlet temperature of the drying kiln is 65-85 ℃, the outlet temperature of the drying kiln is 110-;
(4) and (3) firing: putting the dried product in the step (3) into a high-temperature tunnel kiln for sintering, wherein the maximum sintering temperature is 1550 ℃, and the sintering time is 80 min;
(5) and (3) cooling: and (4) taking out the product fired in the step (4), naturally cooling for 6-9h, and then cooling to normal temperature by a fan.
Preferably, the preparation process of the binder in the step (1) is to add industrial phosphoric acid with a concentration of 85%, water and aluminum hydroxide powder into a container according to a ratio, heat the mixture to a transparent colloid for 20-40min, and then cool the transparent colloid to normal temperature for standby.
Preferably, the components of the electrofused white corundum powder, the plate-shaped corundum powder, the desiliconized zirconium powder and the alumina ultrafine powder in the step (1) are added in the adding process according to the order of the particle size from large to small.
The invention has the advantages that:the low-silicon-chromium corundum composite brick, SiO2Less than 1 percent, solves the problem that the chromium corundum brick resists the corrosion of weak alkali atmosphere, greatly prolongs the service life of the kiln, has proper and scientific selection and proportion of materials, and adopts scientific grain gradation with closest packing density to prepare the low-silicon chromium corundum composite brick suitable for the garbage disposal rotary kiln. SiO 22Less than 1 percent, has the service life of 18 months, and is suitable for large-scale pushing and application.
The low-silicon-chromium corundum composite brick of the invention has the following main parameter measurement results:
chemical analysis was performed on GB/T5070-2015 chromium-containing refractory;
detecting apparent porosity and executing YB/T5200-1993;
the detection of the bulk density was carried out YB/T5200-1993;
detecting the refractoriness under load to execute YB/T370-2016 normal temperature; and YB/T5072-2018 is carried out for detecting the compressive strength.
Detailed Description
The low-silicon-chromium corundum composite bricks and the preparation method thereof are described in detail in .
Example 1
kinds of low-silicon-chromium corundum composite bricks, which are prepared from electro-fused white corundum, tabular corundum, electro-fused chromium oxide, desiliconized zirconium, alumina ultrafine powder and a binding agent according to the following percentage:
electric melting white corundum: 12 percent of granularity of 5-3 mm;
the granularity is 3-1mm and 15 percent;
the granularity is 1-0mm and 6 percent;
particle size <0.074mm 20%;
plate corundum: the granularity is 3-1mm and 8 percent;
7 percent of granularity of 1-0 mm;
particle size <0.074mm 16%;
electric melting chromic oxide: 8 percent of granularity of 1-0 mm;
particle size <0.074mm 4%;
desiliconizing zirconium: the granularity is less than 0.074mm 2%;
alumina ultrafine powder: the granularity is less than 0.001mm 2%;
the sum of the weight percentages of the components is 100 percent,
in addition, a binding agent is added, the weight of the binding agent is 4 percent of the total weight of the components,
wherein, the bonding agent consists of 45 percent of industrial phosphoric acid with the concentration of 85 percent, 20 percent of water and 35 percent of aluminum hydroxide powder.
Wherein Al in the electro-fused white corundum2O3Not less than 99.5%, Fe2O3Not higher than 0.5%.
Wherein, the plate-shaped corundum contains Al2O3Not less than 99.5%, Fe2O3Not higher than 0.3%.
Wherein Cr in the electrofused chromium oxide2O3Not less than 99.5%, Fe2O3Not higher than 0.3%.
Wherein ZrO in the desilicated zirconium2Not less than 95% of Fe2O3Not higher than 0.5%.
Wherein, the alumina ultrafine powder Al2O3Not less than 99.5%, Fe2O3Not higher than 0.2%.
The preparation method of kinds of low-silicon chromium corundum composite bricks comprises the following steps:
(1) mixing: mixing 2/3 binder, fused white corundum powder, tabular corundum powder, desiliconized zirconium powder and alumina ultrafine powder, adding into a forced mixer, mixing for 2min, and then continuing to add the rest 1/3 binder into the forced mixer and mixing for 2 min;
(2) molding: performing hydraulic forming on the mixed material in the step (1) into a green brick by adopting a 1250-ton hydraulic press;
(3) and (3) drying: placing the green bricks formed in the step (2) into a tunnel drying kiln for drying, wherein the inlet temperature of the drying kiln is 70 ℃, the outlet temperature of the drying kiln is 120 ℃, and the drying time is 20 min;
(4) and (3) firing: putting the dried product in the step (3) into a high-temperature tunnel kiln for sintering, wherein the maximum sintering temperature is 1550 ℃, and the sintering time is 80 min;
(5) and (3) cooling: and (4) taking out the product fired in the step (4), naturally cooling for 8h, and then cooling to normal temperature by using a fan.
Adding 85% industrial phosphoric acid, water and aluminum hydroxide powder into a container according to a ratio, heating for 30min to obtain a transparent colloid, and cooling to normal temperature for later use.
Wherein, the components of the electrofused white corundum powder, the plate-shaped corundum powder, the desiliconized zirconium powder and the alumina ultrafine powder in the step (1) are added in the adding process according to the order of the particle size from large to small.
Example 2
kinds of low-silicon-chromium corundum composite bricks, which are prepared from electro-fused white corundum, tabular corundum, electro-fused chromium oxide, desiliconized zirconium, alumina ultrafine powder and a binding agent according to the following percentage:
electric melting white corundum: 11 percent of granularity 5-3 mm;
23% of granularity 3-1 mm;
the granularity is 1-0mm 5%;
particle size <0.074mm 12%;
plate corundum: 7 percent of granularity of 3-1 mm;
10 percent of granularity 1-0 mm;
particle size <0.074mm 12%;
electric melting chromic oxide: 7 percent of granularity of 1-0 mm;
the granularity is less than 0.074mm < 3%;
desiliconizing zirconium: the granularity is less than 0.074mm and 8 percent;
alumina ultrafine powder: the granularity is less than 0.001mm 2%;
the sum of the weight percentages of the components is 100 percent,
in addition, a binding agent is added, the weight of the binding agent is 3 percent of the total weight of the components,
wherein, the bonding agent consists of 47 percent of industrial phosphoric acid with the concentration of 85 percent, 20 percent of water and 33 percent of aluminum hydroxide powder.
Wherein Al in the electro-fused white corundum2O3Not less than 99.5%, Fe2O3Not higher than 0.5%.
Wherein, the plate-shaped corundum contains Al2O3Not less than 99.5%, Fe2O3Not higher than 0.3%.
Wherein Cr in the electrofused chromium oxide2O3Not less than 99.5%, Fe2O3Not higher than 0.3%.
Wherein ZrO in the desilicated zirconium2Not less than 95% of Fe2O3Not higher than 0.5%.
Wherein, the alumina ultrafine powder Al2O3Not less than 99.5%, Fe2O3Not higher than 0.2%.
The preparation method of kinds of low-silicon chromium corundum composite bricks comprises the following steps:
(1) mixing: mixing 2/3 binder, fused white corundum powder, tabular corundum powder, desiliconized zirconium powder and alumina ultrafine powder, adding into a forced mixer, mixing for 3min, and then continuing to add the rest 1/3 binder into the forced mixer and mixing for 3 min;
(2) molding: performing hydraulic forming on the mixed material in the step (1) into a green brick by adopting a 1250-ton hydraulic press;
(3) and (3) drying: placing the green bricks formed in the step (2) into a tunnel drying kiln for drying, wherein the inlet temperature of the drying kiln is 65 ℃, the outlet temperature of the drying kiln is 110 ℃, and the drying time is 20 min;
(4) and (3) firing: putting the dried product in the step (3) into a high-temperature tunnel kiln for sintering, wherein the maximum sintering temperature is 1550 ℃, and the sintering time is 80 min;
(5) and (3) cooling: and (4) taking out the product fired in the step (4), naturally cooling for 6h, and then cooling to normal temperature by using a fan.
Adding 85% industrial phosphoric acid, water and aluminum hydroxide powder into a container according to the ratio, heating the mixture to a transparent colloid for 20min, and then cooling the transparent colloid to normal temperature for later use.
Wherein, the components of the electrofused white corundum powder, the plate-shaped corundum powder, the desiliconized zirconium powder and the alumina ultrafine powder in the step (1) are added in the adding process according to the order of the particle size from large to small.
Example 3
kinds of low-silicon-chromium corundum composite bricks, which are prepared from electro-fused white corundum, tabular corundum, electro-fused chromium oxide, desiliconized zirconium, alumina ultrafine powder and a binding agent according to the following percentage:
electric melting white corundum: 8 percent of granularity 5-3 mm;
18 percent of granularity of 3-1 mm;
the granularity is 1-0mm 5%;
the granularity is less than 0.074mm and 30 percent;
plate corundum: 7 percent of granularity of 3-1 mm;
the granularity is 1-0mm 5%;
particle size <0.074mm 12%;
electric melting chromic oxide: 7 percent of granularity of 1-0 mm;
the granularity is less than 0.074mm < 3%;
desiliconizing zirconium: the granularity is less than 0.074mm < 3%;
alumina ultrafine powder: the granularity is less than 0.001mm 2%;
the sum of the weight percentages of the components is 100 percent,
in addition, a binding agent is added, the weight of the binding agent is 3 percent of the total weight of the components,
wherein, the bonding agent consists of 42 percent of industrial phosphoric acid with the concentration of 85 percent, 25 percent of water and 33 percent of aluminum hydroxide powder.
Wherein Al in the electro-fused white corundum2O3Not less than 99.5%, Fe2O3Not higher than 0.5%.
Wherein, the plate-shaped corundum contains Al2O3Not less than 99.5%, Fe2O3Not higher than 0.3%.
Wherein Cr in the electrofused chromium oxide2O3Not less than 99.5%, Fe2O3Not higher than 0.3%.
Wherein ZrO in the desilicated zirconium2Not less than 95%，Fe2O3Not higher than 0.5%.
Wherein, the alumina ultrafine powder Al2O3Not less than 99.5%, Fe2O3Not higher than 0.2%.
The preparation method of kinds of low-silicon chromium corundum composite bricks comprises the following steps:
(1) mixing: mixing 2/3 binder, fused white corundum powder, tabular corundum powder, desiliconized zirconium powder and alumina ultrafine powder, adding into a forced mixer, mixing for 1min, and then continuing to add the rest 1/3 binder into the forced mixer and mixing for 3 min;
(2) molding: performing hydraulic forming on the mixed material in the step (1) into a green brick by adopting a 1250-ton hydraulic press;
(3) and (3) drying: putting the green bricks formed in the step (2) into a tunnel drying kiln for drying, wherein the inlet temperature of the drying kiln is 85 ℃, the outlet temperature of the drying kiln is 130 ℃, and the drying time is 20 min;
(4) and (3) firing: putting the dried product in the step (3) into a high-temperature tunnel kiln for sintering, wherein the maximum sintering temperature is 1550 ℃, and the sintering time is 80 min;
(5) and (3) cooling: and (4) taking out the product fired in the step (4), naturally cooling for 9h, and then cooling to normal temperature by using a fan.
Adding 85% industrial phosphoric acid, water and aluminum hydroxide powder into a container according to the ratio, heating to a transparent colloid for 40min, and then cooling to normal temperature for later use.
Wherein, the components of the electrofused white corundum powder, the plate-shaped corundum powder, the desiliconized zirconium powder and the alumina ultrafine powder in the step (1) are added in the adding process according to the order of the particle size from large to small.
Example 4
kinds of low-silicon-chromium corundum composite bricks, which are prepared from electro-fused white corundum, tabular corundum, electro-fused chromium oxide, desiliconized zirconium, alumina ultrafine powder and a binding agent according to the following percentage:
electric melting white corundum: 8 percent of granularity 5-3 mm;
23% of granularity 3-1 mm;
7 percent of granularity of 1-0 mm;
particle size <0.074mm 12%;
plate corundum: the granularity is 3-1mm and 11 percent;
the granularity is 1-0mm 5%;
particle size <0.074mm 12%;
electric melting chromic oxide: the granularity is 1-0mm and 11%;
the granularity is less than 0.074mm < 3%;
desiliconizing zirconium: the granularity is less than 0.074mm 2%;
alumina ultrafine powder: the granularity is less than 0.001mm 6%;
the sum of the weight percentages of the components is 100 percent,
in addition, a binding agent is added, the weight of the binding agent is 3 percent of the total weight of the components,
wherein, the bonding agent consists of 42 percent of industrial phosphoric acid with the concentration of 85 percent, 22 percent of water and 36 percent of aluminum hydroxide powder.
Wherein Al in the electro-fused white corundum2O3Not less than 99.5%, Fe2O3Not higher than 0.5%.
Wherein, the plate-shaped corundum contains Al2O3Not less than 99.5%, Fe2O3Not higher than 0.3%.
Wherein Cr in the electrofused chromium oxide2O3Not less than 99.5%, Fe2O3Not higher than 0.3%.
Wherein ZrO in the desilicated zirconium2Not less than 95% of Fe2O3Not higher than 0.5%.
Wherein, the alumina ultrafine powder Al2O3Not less than 99.5%, Fe2O3Not higher than 0.2%.
The preparation method of kinds of low-silicon chromium corundum composite bricks comprises the following steps:
(1) mixing: mixing 2/3 binder, fused white corundum powder, tabular corundum powder, desiliconized zirconium powder and alumina ultrafine powder, adding into a forced mixer, mixing for 3min, and then continuing to add the rest 1/3 binder into the forced mixer and mixing for 3 min;
(2) molding: performing hydraulic forming on the mixed material in the step (1) into a green brick by adopting a 1250-ton hydraulic press;
(3) and (3) drying: placing the green bricks formed in the step (2) into a tunnel drying kiln for drying, wherein the inlet temperature of the drying kiln is 65 ℃, the outlet temperature of the drying kiln is 110 ℃, and the drying time is 20 min;
(4) and (3) firing: putting the dried product in the step (3) into a high-temperature tunnel kiln for sintering, wherein the maximum sintering temperature is 1550 ℃, and the sintering time is 80 min;
(5) and (3) cooling: and (4) taking out the product fired in the step (4), naturally cooling for 6h, and then cooling to normal temperature by using a fan.
Adding 85% industrial phosphoric acid, water and aluminum hydroxide powder into a container according to the ratio, heating the mixture to a transparent colloid for 20min, and then cooling the transparent colloid to normal temperature for later use.
Wherein, the components of the electrofused white corundum powder, the plate-shaped corundum powder, the desiliconized zirconium powder and the alumina ultrafine powder in the step (1) are added in the adding process according to the order of the particle size from large to small.
Example 5
kinds of low-silicon-chromium corundum composite bricks, which are prepared from electro-fused white corundum, tabular corundum, electro-fused chromium oxide, desiliconized zirconium, alumina ultrafine powder and a binding agent according to the following percentage:
electric melting white corundum: 8 percent of granularity 5-3 mm;
the granularity is 3-1mm and 21 percent;
the granularity is 1-0mm 5%;
particle size <0.074mm 12%;
plate corundum: 7 percent of granularity of 3-1 mm;
7 percent of granularity of 1-0 mm;
particle size <0.074mm 19%;
electric melting chromic oxide: 7 percent of granularity of 1-0 mm;
the granularity is less than 0.074mm and 9 percent;
desiliconizing zirconium: the granularity is less than 0.074mm 2%;
alumina ultrafine powder: the granularity is less than 0.001mm < 3%;
the sum of the weight percentages of the components is 100 percent,
in addition, a binding agent is added, the weight of the binding agent is 6 percent of the total weight of the components,
wherein, the bonding agent consists of 42 percent of industrial phosphoric acid with the concentration of 85 percent, 20 percent of water and 38 percent of aluminum hydroxide powder.
Wherein Al in the electro-fused white corundum2O3Not less than 99.5%, Fe2O3Not higher than 0.5%.
Wherein, the plate-shaped corundum contains Al2O3Not less than 99.5%, Fe2O3Not higher than 0.3%.
Wherein Cr in the electrofused chromium oxide2O3Not less than 99.5%, Fe2O3Not higher than 0.3%.
Wherein ZrO in the desilicated zirconium2Not less than 95% of Fe2O3Not higher than 0.5%.
Wherein, the alumina ultrafine powder Al2O3Not less than 99.5%, Fe2O3Not higher than 0.2%.
The preparation method of kinds of low-silicon chromium corundum composite bricks comprises the following steps:
(1) mixing: mixing 2/3 binder, fused white corundum powder, tabular corundum powder, desiliconized zirconium powder and alumina ultrafine powder, adding into a forced mixer, mixing for 3min, and then continuing to add the rest 1/3 binder into the forced mixer and mixing for 3 min;
(2) molding: performing hydraulic forming on the mixed material in the step (1) into a green brick by adopting a 1250-ton hydraulic press;
(3) and (3) drying: placing the green bricks formed in the step (2) into a tunnel drying kiln for drying, wherein the inlet temperature of the drying kiln is 75 ℃, the outlet temperature of the drying kiln is 125 ℃, and the drying time is 20 min;
(4) and (3) firing: putting the dried product in the step (3) into a high-temperature tunnel kiln for sintering, wherein the maximum sintering temperature is 1550 ℃, and the sintering time is 80 min;
(5) and (3) cooling: and (4) taking out the product fired in the step (4), naturally cooling for 6h, and then cooling to normal temperature by using a fan.
Adding 85% industrial phosphoric acid, water and aluminum hydroxide powder into a container according to the ratio, heating the mixture to a transparent colloid for 20min, and then cooling the transparent colloid to normal temperature for later use.
Wherein, the components of the electrofused white corundum powder, the plate-shaped corundum powder, the desiliconized zirconium powder and the alumina ultrafine powder in the step (1) are added in the adding process according to the order of the particle size from large to small.
The products in examples 1, 2, 3, 4 and 5 are extracted to detect physical and chemical indexes, and the determination performance is better, specifically as the determination results in table 1:
TABLE 1
Wherein chemical analysis performed GB/T5070-2015 chromium-containing refractory;
detecting apparent porosity and executing YB/T5200-1993;
the detection of the bulk density was carried out YB/T5200-1993;
detecting the refractoriness under load to execute YB/T370-2016 normal temperature; YB/T5072-2018 for detecting compression strength
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1, kinds of low silicon chromium corundum composite brick, characterized in that it is prepared by electric melting white corundum, tabular corundum, electric melting chromic oxide, desiliconized zirconium, alumina superfine powder according to the following percentage:
electric melting white corundum: 8-12% of granularity 5-3 mm;
15-23% of granularity 3-1 mm;
5-8% of granularity 1-0 mm;
12-30% of granularity less than 0.074 mm;
plate corundum: 7-11% of granularity 3-1 mm;
5-10% of granularity 1-0 mm;
12-19% of granularity less than 0.074 mm;
electric melting chromic oxide: 7-12% of granularity 1-0 mm;
the granularity is less than 0.074mm and 3-9 percent;
desiliconizing zirconium: the granularity is less than 0.074mm 2-8%;
alumina ultrafine powder: the granularity is less than 0.001mm 2-6%;
the sum of the weight percentages of the components is 100 percent,
and a binding agent is added, wherein the weight of the binding agent is 3-6% of the total weight of the components, and the binding agent consists of 42-61% of industrial phosphoric acid with the concentration of 85%, 20-40% of water and 33-47% of aluminum hydroxide powder.
2. The kinds of low-silicon-chromium corundum composite brick according to claim 1, wherein Al in said fused white corundum2O3Not less than 99.5%, Fe2O3Not higher than 0.5%.
3. The kinds of low-Si-Cr-corundum composite brick as claimed in claim 1, wherein Al in said plate-like corundum2O3Not less than 99.5%, Fe2O3Not higher than 0.3%.
4. The kinds of low-Si-Cr-corundum composite brick according to claim 1, wherein said electrofused chromium oxide contains Cr2O3Not less than 99.5%, Fe2O3Not higher than 0.3%.
5. The kinds of low-silicon-chromium corundum composite brick as claimed in claim 1, wherein ZrO in said desilicated zirconium2Not less than 95% of Fe2O3Not higher than 0.5%.
6. The kinds of low-Si-Cr-corundum composite brick as claimed in claim 1, wherein said Al is ultrafine Al powder2O3Not less than 99.5%, Fe2O3Not higher than 0.2%.
7. The kind of composite bricks containing low silicon and chromium corundum features that the binder is composed of 85% concentration industrial phosphoric acid 42-47%, water 20-25% and aluminum hydroxide powder 33-38%.
8, A method for preparing the low-silicon chromium corundum composite brick as claimed in any one of claims 1-7 and , which comprises the following steps:
mixing: mixing 2/3 binder, fused white corundum powder, tabular corundum powder, desiliconized zirconium powder and alumina ultrafine powder, adding into a forced mixer, mixing for 1-3min, and then continuing to add the rest 1/3 binder into the forced mixer, mixing for 2-3 min;
molding: performing hydraulic forming on the mixed material in the step (1) into a green brick by adopting a 1250-ton hydraulic press;
and (3) drying: placing the green bricks formed in the step (2) into a tunnel drying kiln for drying, wherein the inlet temperature of the drying kiln is 65-85 ℃, the outlet temperature of the drying kiln is 110-;
and (3) firing: putting the dried product in the step (3) into a high-temperature tunnel kiln for sintering, wherein the maximum sintering temperature is 1550 ℃, and the sintering time is 80 min;
and (3) cooling: and (4) taking out the product fired in the step (4), naturally cooling for 6-9h, and then cooling to normal temperature by a fan.
9. The method for preparing kinds of low-silicon-chromium corundum composite bricks according to claim 8, wherein the binder in step (1) is prepared by adding 85% industrial phosphoric acid, water and aluminum hydroxide powder into a container at a certain ratio, heating to a transparent colloid for 20-40min, and cooling to room temperature.
10. The method for preparing kinds of low-silicon-chromium-corundum composite bricks according to claim 8, wherein the components of the electrofused white corundum powder, the plate-shaped corundum powder, the desiliconized zirconium powder and the alumina ultrafine powder in the step (1) are added in the order of increasing the particle size to decreasing the particle size in the adding process.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111470875A (en) * | 2020-06-12 | 2020-07-31 | 焦作金鑫恒拓新材料股份有限公司 | Refractory castable for molten pool part of garbage melting gasifier |
| CN112374872A (en) * | 2020-10-23 | 2021-02-19 | 郑州荣盛窑炉耐火材料有限公司 | Shock-resistant, acid-erosion-resistant and fire-resistant plastic material for incinerator lining and preparation method thereof |
| CN112374873A (en) * | 2020-11-17 | 2021-02-19 | 宜兴瑞泰耐火材料工程有限公司 | Composite chromium corundum brick and preparation process thereof |
| CN112745111A (en) * | 2020-12-07 | 2021-05-04 | 北京金隅通达耐火技术有限公司 | High-density chromium-zirconium-corundum brick for hazardous waste disposal rotary kiln |
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| CN114853454A (en) * | 2022-05-05 | 2022-08-05 | 宜兴市锅炉密封工程有限公司 | High-strength compact zirconium-chromium corundum brick and preparation method thereof |
| CN117362015A (en) * | 2023-10-27 | 2024-01-09 | 河南省瑞泰科实业集团有限公司 | High-purity corundum brick and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104446544A (en) * | 2014-11-26 | 2015-03-25 | 郑州真金耐火材料有限责任公司 | Production method for refractory brick for tuyere area in bottom-blowing furnace |
| CN109503182A (en) * | 2018-12-24 | 2019-03-22 | 中国有色集团晋铝耐材有限公司 | It is a kind of without siliceous gasification furnace dedicated pouring material and preparation method thereof |
| CN109970437A (en) * | 2019-04-26 | 2019-07-05 | 宜兴兴贝耐火材料制品有限公司 | A kind of dangerous waste incinerator Al2O3-Cr2O3-ZrO2Brick and preparation method thereof |
-
2019
- 2019-10-24 CN CN201911017284.4A patent/CN110734275A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104446544A (en) * | 2014-11-26 | 2015-03-25 | 郑州真金耐火材料有限责任公司 | Production method for refractory brick for tuyere area in bottom-blowing furnace |
| CN109503182A (en) * | 2018-12-24 | 2019-03-22 | 中国有色集团晋铝耐材有限公司 | It is a kind of without siliceous gasification furnace dedicated pouring material and preparation method thereof |
| CN109970437A (en) * | 2019-04-26 | 2019-07-05 | 宜兴兴贝耐火材料制品有限公司 | A kind of dangerous waste incinerator Al2O3-Cr2O3-ZrO2Brick and preparation method thereof |
Non-Patent Citations (4)
| Title |
|---|
| 中国冶金百科全书总编辑委员会《耐火材料》卷编辑委员会等: "《中国冶金百科全书 耐火材料》", 31 October 1997, 冶金工业出版社 * |
| 夏征农等: "《大辞海 第37卷 材料科学卷》", 31 December 2015, 上海辞书出版社 * |
| 尹汝珊等: "《耐火材料技术问答》", 28 February 1994, 冶金工业出版社 * |
| 胡宝玉等: "《特种耐火材料实用技术手册》", 30 June 2004, 冶金工业出版社 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111470875A (en) * | 2020-06-12 | 2020-07-31 | 焦作金鑫恒拓新材料股份有限公司 | Refractory castable for molten pool part of garbage melting gasifier |
| CN112374872A (en) * | 2020-10-23 | 2021-02-19 | 郑州荣盛窑炉耐火材料有限公司 | Shock-resistant, acid-erosion-resistant and fire-resistant plastic material for incinerator lining and preparation method thereof |
| CN112374873A (en) * | 2020-11-17 | 2021-02-19 | 宜兴瑞泰耐火材料工程有限公司 | Composite chromium corundum brick and preparation process thereof |
| CN112374873B (en) * | 2020-11-17 | 2022-07-26 | 宜兴瑞泰耐火材料工程有限公司 | Composite chromium corundum brick and preparation process thereof |
| CN112745111A (en) * | 2020-12-07 | 2021-05-04 | 北京金隅通达耐火技术有限公司 | High-density chromium-zirconium-corundum brick for hazardous waste disposal rotary kiln |
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| CN114853454A (en) * | 2022-05-05 | 2022-08-05 | 宜兴市锅炉密封工程有限公司 | High-strength compact zirconium-chromium corundum brick and preparation method thereof |
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