CN103073275A - Abandoned sand-based mullite lightweight aggregate and preparation method thereof - Google Patents
Abandoned sand-based mullite lightweight aggregate and preparation method thereof Download PDFInfo
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- CN103073275A CN103073275A CN2013100164628A CN201310016462A CN103073275A CN 103073275 A CN103073275 A CN 103073275A CN 2013100164628 A CN2013100164628 A CN 2013100164628A CN 201310016462 A CN201310016462 A CN 201310016462A CN 103073275 A CN103073275 A CN 103073275A
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Abstract
The invention relates to an abandoned sand-based mullite lightweight aggregate and a preparation method thereof. The technical scheme adopted by the invention is as follows: the preparation method comprises the following steps: firstly, mixing raw materials 40-80wt% of abandoned sand and 20-60wt% of special-grade bauxite, or 60-80wt% of abandoned sand and 20-40wt% of alpha-Al2O3 fine powder; secondly, adding raw materials 20-40wt% of pore forming agent, 1.0-5.0wt% of plasticizer, 0.05-0.5wt% of bonding agent and 10-30wt% of water, uniformly mixing, and granulating to obtain a spherical blank; thirdly, naturally drying, and baking for 20-30 hours at 100-120 DEG C; and finally preserving heat for 3-10 hours at 1250-1500 DEG C to obtain the abandoned sand-based mullite lightweight aggregate. The preparation method has the advantages of low production cost, simple process, energy conservation and environmental friendliness; by the preparation method, the abandoned sand is recycled, with good social and economic benefits; and the prepared abandoned sand-based mullite lightweight aggregate has relatively low bulk density and relatively high strength and is applicable to the field of lightweight refractory materials and the building material industry.
Description
Technical field
The invention belongs to the mullite lightweight aggregate technical field, be specifically related to a kind of mullite lightweight aggregate based on discarding molding sand and preparation method thereof.
Background technology
Discarded molding sand is solid waste main in the foundry production.China is big country in foundry, and casting output occupied the first in the world in continuous 11 years, and the annual discarded molding sand that produces reaches more than 4,000 ten thousand tons.Yet the regeneration rate of the discarded molding sand of China is very low at present, only is 20 ~ 30wt%, the recycling aspect is then substantially for the production of low value-added products such as building materials, all the other are processed by the landfill mode greatly, and this has not only increased the burden of enterprise, also can cause very large destruction to environment.
Specific to the precision casting industry, China also is Asia second largest precision casting country, annual approximately 700,000 tons the discarded molding sand of precision casting that produces.The present research that fully utilizes for the discarded molding sand of precision casting seldom, it is mainly taked the processing mode of landfill, " a kind of mullite light heat-insulation brick based on discarding molding sand and preparation method thereof " be patented technology (CN102633512A), prepare the mullite light heat-insulation brick take the discarded molding sand of precision casting as main raw material, its molding mode comprises extrusion moulding, semidrying mechanical pressing, semidrying vibration extrusion forming.The deficiency of the method is: (1) mullite light heat-insulation brick is mainly used in the thermofin of Industrial Stoves, and use range is limited, is unfavorable for improving the recovery utilization rate of discarded molding sand.(2) processing loss after the extrusion moulding is large, the semidrying mechanical pressing is prone to slabbing and layer density phenomenon, semidrying vibration extrusion forming is high to the component requirement of strength of equipment, and easily causes density distribution uneven, and these all can cause disadvantageous effect to the production of product.(3) volume density of the light mullite brick that makes of the method is higher.
In recent years, mullite lightweight aggregate has been obtained increasingly extensive application because of the high good use properties of its intensity at high temperature kiln.But because complex manufacturing, the factors such as production cost height have affected the use of mullite lightweight aggregate to a certain extent.Such as " a kind of micro-pore mullite lightweight aggregate and preparation method thereof " (CN101265118A) patented technology, disclose a kind of with the method for coal gangue as the main material production mullite lightweight aggregate, this patented technology utilizes Coal Refuse can reduce production costs to a certain extent as raw material, but that its deficiency is mainly reflected in the production cycle is long; Surface tissue and the too little meeting of screen underflow granularity that shattering process has been destroyed aggregate cause larger reheating linear change rate on reheating." a kind of high-purity high-strength light-weight mullite refractory aggregate and preparation method " (CN101817688A) patented technology prepares mullite lightweight aggregate with natural silica and industrial high purity aluminium oxide, and production cost is high; Complex manufacturing is unfavorable for large-scale industrial production.
Summary of the invention
The present invention is intended to overcome the defective of prior art, and purpose provides that a kind of production cost is low, technique is simple and the preparation method based on the mullite lightweight aggregate of discarded molding sand of energy-conserving and environment-protective.The mullite lightweight aggregate based on discarded molding sand prepared with the method has lower volume density and higher intensity, and use range is wide.
For achieving the above object, the technical solution adopted in the present invention is: first take the high grade bauxite of the discarded molding sand of 40 ~ 80wt% and 20 ~ 60wt% as raw material or with the discarded molding sand of 60 ~ 80wt% and α-Al of 20 ~ 40wt%
2O
3Fine powder is that raw material mixes, add again the pore-forming material of described raw material 20 ~ 40wt%, the softening agent of 1.0 ~ 5.0wt%, the wedding agent of 0.05 ~ 0.5wt% and the water of 10 ~ 30wt%, mix, granulation, make spherical biscuit, seasoning was toasted 20 ~ 30 hours under 100 ~ 120 ℃ of conditions, then under 1250 ~ 1500 ℃ of conditions, be incubated 3 ~ 10 hours, namely get the mullite lightweight aggregate based on discarded molding sand.
The main chemical compositions of described discarded molding sand is: Al
2O
3Content 〉=35wt%, SiO
2Content 〉=50wt%, ZrO
2Content 〉=3.0wt%, Fe
2O
3Content≤1.5wt%, K
2O+Na
2O content≤1.0wt%; Particle diameter≤the 0.15mm of discarded molding sand.
The particle diameter of described high grade bauxite≤0.089 mm.
Described α-Al
2O
3The particle diameter of fine powder≤0.089 mm.
Described pore-forming material is a kind of in sawdust, chaff and the powdered rice hulls.
Described softening agent is dextrin or is glucose.
Described wedding agent is one or both in tripoly phosphate sodium STPP, Xylo-Mucine and the sodium lignosulfonate.
Owing to adopting technique scheme, the present invention utilizes discarded molding sand as main raw material, has also reduced the pollution of solid waste when reducing production costs, energy-conserving and environment-protective; Make granular biscuit after mixing, namely get the mullite lightweight aggregate based on discarded molding sand after baking, the calcining, production technique is simple; Prepared mullite lightweight aggregate based on discarded molding sand: volume density is 0.49 ~ 0.72g/cm
3, cold crushing strength is 4.1 ~ 8.3MPa, apparent porosity is 41 ~ 72%; Particle diameter mainly is distributed in 12 ~ 0.5mm.
Therefore, the present invention has advantages of that production cost is low, technique simple and energy-conserving and environment-protective, realized the recycling of discarded molding sand, has good Social benefit and economic benefit, prepared mullite lightweight aggregate based on discarded molding sand has lower volume density and higher intensity, use range is wide, is applicable to lightweight refractory field and building material industry.
Embodiment
The present invention will be further described below in conjunction with embodiment, is not limiting the scope of the invention.
For avoiding repetition, the first raw material unification that this embodiment is related is described below, and repeats no more among the embodiment:
The particle diameter of high grade bauxite≤0.089 mm;
α-Al
2O
3The particle diameter of fine powder≤0.089 mm;
Discarded molding sand main chemical compositions is: Al
2O
3Content 〉=35wt%, SiO
2Content 〉=50wt%, ZrO
2Content 〉=3.0wt%, Fe
2O
3Content≤1.5wt%, K
2O+Na
2O content≤1.0wt%; Particle diameter≤the 0.15mm of discarded molding sand.
Embodiment 1
A kind of mullite lightweight aggregate based on discarding molding sand and preparation method thereof.Be that raw material mixes with the discarded molding sand of 40 ~ 45wt% and the high grade bauxite of 55 ~ 60wt% first, add again the dextrin of described raw material 1 ~ 2wt%, the tripoly phosphate sodium STPP of 0.05 ~ 0.15wt%, the sawdust of 20 ~ 24wt% and the water of 10 ~ 14wt%, mix, granulation, make spherical biscuit, seasoning was toasted 20 ~ 25 hours under 100 ~ 120 ℃ of conditions, then under 1250 ~ 1300 ℃ of conditions, be incubated 8 ~ 10 hours, namely get the mullite lightweight aggregate based on discarded molding sand.
The mullite lightweight aggregate based on discarded molding sand that the present embodiment is prepared: volume density is 0.67 ~ 0.72g/cm
3Cold crushing strength is 7.1 ~ 8.3MPa; Apparent porosity is 45 ~ 53%.
Embodiment 2
A kind of mullite lightweight aggregate based on discarding molding sand and preparation method thereof.Be that raw material mixes with the discarded molding sand of 45 ~ 50wt% and the high grade bauxite of 50 ~ 55wt% first, add again the dextrin of described raw material 2 ~ 3wt%, the tripoly phosphate sodium STPP of 0.15 ~ 0.25wt%, the sawdust of 24 ~ 28wt% and the water of 14 ~ 18wt%, mix, granulation, make spherical biscuit, seasoning was toasted 20 ~ 25 hours under 100 ~ 120 ℃ of conditions, then under 1300 ~ 1350 ℃ of conditions, be incubated 6 ~ 8 hours, namely get the mullite lightweight aggregate based on discarded molding sand.
The mullite lightweight aggregate based on discarded molding sand that the present embodiment is prepared: volume density is 0.65 ~ 0.69g/cm
3Cold crushing strength is 6.5 ~ 7.9MPa; Apparent porosity is 48 ~ 57%.
Embodiment 3
A kind of mullite lightweight aggregate based on discarding molding sand and preparation method thereof.Be that raw material mixes with the discarded molding sand of 50 ~ 55wt% and the high grade bauxite of 45 ~ 50wt% first, add again the dextrin of described raw material 3 ~ 4wt%, the Xylo-Mucine of 0.15 ~ 0.25wt%, the sawdust of 28 ~ 32wt% and the water of 18 ~ 22wt%, mix, granulation, make spherical biscuit, seasoning was toasted 20 ~ 25 hours under 100 ~ 120 ℃ of conditions, then under 1350 ~ 1400 ℃ of conditions, be incubated 4 ~ 6 hours, namely get the mullite lightweight aggregate based on discarded molding sand.
The mullite lightweight aggregate based on discarded molding sand that the present embodiment is prepared: volume density is 0.58 ~ 0.67g/cm
3Cold crushing strength is 5.1 ~ 7.1MPa; Apparent porosity is 50 ~ 56%.
Embodiment 4
A kind of mullite lightweight aggregate based on discarding molding sand and preparation method thereof.Be that raw material mixes with the discarded molding sand of 55 ~ 60wt% and the high grade bauxite of 40 ~ 45wt% first, add again the dextrin of described raw material 4 ~ 5wt%, the Xylo-Mucine of 0.25 ~ 0.35wt%, the sawdust of 32 ~ 36wt% and the water of 22 ~ 26wt%, mix, granulation, make spherical biscuit, seasoning was toasted 25 ~ 30 hours under 100 ~ 120 ℃ of conditions, then under 1400 ~ 1450 ℃ of conditions, be incubated 3 ~ 4 hours, namely get the mullite lightweight aggregate based on discarded molding sand.
The mullite lightweight aggregate based on discarded molding sand that the present embodiment is prepared: volume density is 0.53 ~ 0.57g/cm
3Cold crushing strength is 4.1 ~ 5.6MPa; Apparent porosity is 58 ~ 67%.
Embodiment 5
A kind of mullite lightweight aggregate based on discarding molding sand and preparation method thereof.Be that raw material mixes with the discarded molding sand of 60 ~ 65wt% and the high grade bauxite of 35 ~ 40wt% first, adding the glucose of described raw material 3 ~ 4wt%, the sodium lignosulfonate of 0.3 ~ 0.4wt%, the chaff of 30 ~ 34wt% and the water of 26 ~ 30wt% mixes again, granulation, make spherical biscuit, seasoning was toasted 25 ~ 30 hours under 100 ~ 120 ℃ of conditions, then was warming up to 1300 ~ 1400 ℃, be incubated 4 ~ 6 hours, namely get the mullite lightweight aggregate based on discarded molding sand.
The mullite lightweight aggregate based on discarded molding sand that the present embodiment is prepared: volume density is 0.55 ~ 0.61g/cm
3Cold crushing strength is 4.9 ~ 6.8MPa; Apparent porosity is 53 ~ 62%.
Embodiment 6
A kind of mullite lightweight aggregate based on discarding molding sand and preparation method thereof.Be that raw material mixes with the discarded molding sand of 65 ~ 70wt% and the high grade bauxite of 30 ~ 35wt% first, add again the dextrin of described raw material 4 ~ 5wt%, the sodium lignosulfonate of 0.4 ~ 0.5wt%, the chaff of 34 ~ 40wt% and the water of 15 ~ 20wt%, mix, granulation, make spherical biscuit, seasoning was toasted 20 ~ 25 hours under 100 ~ 120 ℃ of conditions, then under 1350 ~ 1450 ℃ of conditions, be incubated 4 ~ 6 hours, namely get the mullite lightweight aggregate based on discarded molding sand.
The mullite lightweight aggregate based on discarded molding sand that the present embodiment is prepared: volume density is 0.49 ~ 0.56g/cm
3Cold crushing strength is 4.1 ~ 5.6MPa; Apparent porosity is 61 ~ 72%.
Embodiment 7
A kind of mullite lightweight aggregate based on discarding molding sand and preparation method thereof.Be that raw material mixes with the discarded molding sand of 70 ~ 75wt% and the high grade bauxite of 25 ~ 30wt% first, add again the glucose of described raw material 2.5 ~ 3.5wt%, the tripoly phosphate sodium STPP of 0.05 ~ 0.15wt%, the Xylo-Mucine of 0.1 ~ 0.2wt%, the powdered rice hulls of 28 ~ 32wt% and the water of 20 ~ 25wt%, mix, granulation, make spherical biscuit, seasoning, under 100 ~ 120 ℃ of conditions, toasted 25 ~ 30 hours, then under 1250 ~ 1350 ℃ of conditions, be incubated 6 ~ 8 hours, namely get the mullite lightweight aggregate based on discarded molding sand.
The mullite lightweight aggregate based on discarded molding sand that the present embodiment is prepared: volume density is 0.61 ~ 0.70g/cm
3Cold crushing strength is 5.5 ~ 7.9MPa; Apparent porosity is 48 ~ 55%.
Embodiment 8
A kind of mullite lightweight aggregate based on discarding molding sand and preparation method thereof.Be that raw material mixes with the discarded molding sand of 75 ~ 80wt% and the high grade bauxite of 20 ~ 25wt% first, add again the glucose of described raw material 3.5 ~ 4.5wt%, the Xylo-Mucine of 0.15 ~ 0.25wt%, the sodium lignosulfonate of 0.05 ~ 0.15wt%, the powdered rice hulls of 32 ~ 36wt% and the water of 20 ~ 25wt%, mix, granulation, make spherical biscuit, seasoning, under 100 ~ 120 ℃ of conditions, toasted 25 ~ 30 hours, then under 1300 ~ 1400 ℃ of conditions, be incubated 6 ~ 8 hours, namely get the mullite lightweight aggregate based on discarded molding sand.
The mullite lightweight aggregate based on discarded molding sand that the present embodiment is prepared: volume density is 0.55 ~ 0.63g/cm
3Cold crushing strength is 4.8 ~ 6.9MPa; Apparent porosity is 52 ~ 61%.
Embodiment 9
A kind of mullite lightweight aggregate based on discarding molding sand and preparation method thereof.First with the discarded molding sand of 60 ~ 70wt% and α-Al of 30 ~ 40wt%
2O
3Fine powder is that raw material mixes, add again the dextrin of described raw material 3 ~ 4wt%, the tripoly phosphate sodium STPP of 0.25 ~ 0.35wt%, the sawdust of 28 ~ 32wt% and the water of 25 ~ 30wt%, mix, granulation makes spherical biscuit, seasoning, under 100 ~ 120 ℃ of conditions, toasted 25 ~ 30 hours, then be warming up to 1400 ~ 1500 ℃, be incubated 8 ~ 10 hours, namely get the mullite lightweight aggregate based on discarded molding sand.
The mullite lightweight aggregate based on discarded molding sand that the present embodiment is prepared: volume density is 0.65 ~ 0.70g/cm
3Cold crushing strength is 6.3 ~ 7.9MPa; Apparent porosity is 41 ~ 53%.
Embodiment 10
A kind of mullite lightweight aggregate based on discarding molding sand and preparation method thereof.First with the discarded molding sand of 70 ~ 80wt% and α-Al of 20 ~ 30wt%
2O
3Fine powder is that raw material mixes, add again the dextrin of described raw material 4 ~ 5wt%, the tripoly phosphate sodium STPP of 0.1 ~ 0.2wt%, the sodium lignosulfonate of 0.15 ~ 0.25wt%, the sawdust of 32 ~ 36wt% and the water of 25 ~ 30wt%, mix, granulation, make spherical biscuit, seasoning was toasted 25 ~ 30 hours under 100 ~ 120 ℃ of conditions, then under 1350 ~ 1400 ℃ of conditions, be incubated 6 ~ 8 hours, namely get the mullite lightweight aggregate based on discarded molding sand.
The mullite lightweight aggregate based on discarded molding sand that the present embodiment is prepared: volume density is 0.56 ~ 0.60g/cm
3Cold crushing strength is 4.9 ~ 6.1MPa; Apparent porosity is 52 ~ 65%.
Embodiment 11
A kind of mullite lightweight aggregate based on discarding molding sand and preparation method thereof.First with the discarded molding sand of 60 ~ 70wt% and α-Al of 30 ~ 40wt%
2O
3Fine powder is that raw material mixes, add again the glucose of described raw material 3 ~ 4wt%, the Xylo-Mucine of 0.25 ~ 0.35wt%, the chaff of 28 ~ 32wt% and the water of 25 ~ 30wt%, mix, granulation, make spherical biscuit, seasoning was toasted 25 ~ 30 hours under 100 ~ 120 ℃ of conditions, then under 1250 ~ 1350 ℃ of conditions, be incubated 3 ~ 6 hours, namely get the mullite lightweight aggregate based on discarded molding sand.
The mullite lightweight aggregate based on discarded molding sand that the present embodiment is prepared: volume density is 0.62 ~ 0.66g/cm
3Cold crushing strength is 5.3 ~ 6.5MPa; Apparent porosity is 43 ~ 55%.
The discarded molding sand of this embodiment utilization has also reduced the pollution of solid waste, energy-conserving and environment-protective as main raw material when reducing production costs; Make granular biscuit after mixing, namely get the mullite lightweight aggregate based on discarded molding sand after baking, the calcining, production technique is simple.Prepared mullite lightweight aggregate based on discarded molding sand: volume density is 0.49 ~ 0.72g/cm
3, cold crushing strength is 4.1 ~ 8.3MPa, apparent porosity is 41 ~ 72%; Particle diameter mainly is distributed in 12 ~ 0.5mm.
Therefore, the present invention has advantages of that production cost is low, technique simple and energy-conserving and environment-protective, has realized the recycling of discarded molding sand, has good Social benefit and economic benefit; Prepared mullite lightweight aggregate based on discarded molding sand has lower volume density and higher intensity, and use range is wide, can be applicable to lightweight refractory field and building material industry.
Claims (8)
1. the preparation method based on the mullite lightweight aggregate of discarded molding sand is characterized in that the high grade bauxite of first discarded molding sand take 40 ~ 80wt% and 20 ~ 60wt% is as raw material or with the discarded molding sand of 60 ~ 80wt% and α-Al of 20 ~ 40wt%
2O
3Fine powder is that raw material mixes, add again the pore-forming material of described raw material 20 ~ 40wt%, the softening agent of 1.0 ~ 5.0wt%, the wedding agent of 0.05 ~ 0.5wt% and the water of 10 ~ 30wt%, mix, granulation, make spherical biscuit, seasoning was toasted 20 ~ 30 hours under 100 ~ 120 ℃ of conditions, then under 1250 ~ 1500 ℃ of conditions, be incubated 3 ~ 10 hours, namely get the mullite lightweight aggregate based on discarded molding sand.
2. the preparation method of the mullite lightweight aggregate based on discarding molding sand according to claim 1 is characterized in that the main chemical compositions of described discarded molding sand is: Al
2O
3Content 〉=35wt%, SiO
2Content 〉=50wt%, ZrO
2Content 〉=3.0wt%, Fe
2O
3Content≤1.5wt%, K
2O+Na
2O content≤1.0wt%; Particle diameter≤the 0.15mm of discarded molding sand.
3. the preparation method of the mullite lightweight aggregate based on discarded molding sand according to claim 1 is characterized in that the particle diameter of described high grade bauxite≤0.089 mm.
4. the preparation method of the mullite lightweight aggregate based on discarding molding sand according to claim 1 is characterized in that described α-Al
2O
3The particle diameter of fine powder≤0.089 mm.
5. the preparation method of the mullite lightweight aggregate based on discarded molding sand according to claim 1 is characterized in that described pore-forming material is a kind of in sawdust, chaff and the powdered rice hulls.
6. the preparation method of the mullite lightweight aggregate based on discarding molding sand according to claim 1 is characterized in that described softening agent is dextrin or is glucose.
7. the preparation method of the mullite lightweight aggregate based on discarding molding sand according to claim 1 is characterized in that described wedding agent is one or both in tripoly phosphate sodium STPP, Xylo-Mucine and the sodium lignosulfonate.
8. the prepared mullite lightweight aggregate based on discarded molding sand of preparation method of each described mullite lightweight aggregate based on discarded molding sand according to claim 1 ~ 7.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103449830A (en) * | 2013-08-26 | 2013-12-18 | 武汉科技大学 | Light-weight aluminum-silicon aggregate and preparation method thereof |
| CN104261849A (en) * | 2014-10-08 | 2015-01-07 | 江苏省陶瓷研究所有限公司 | Zirconium-containing mullite-high-silicon dioxide glass composite phase material and preparation method thereof |
| CN104261810A (en) * | 2014-10-08 | 2015-01-07 | 武汉科技大学 | Zirconium-containing mullite composite phase material and preparation method thereof |
| CN104310417A (en) * | 2014-10-08 | 2015-01-28 | 武汉科技大学 | Zirconium-containing cordierite complex phase material and preparation method thereof |
| CN108339928A (en) * | 2017-11-01 | 2018-07-31 | 哈尔滨市易合铸造材料有限公司 | A kind of semi-coke compound powder, the molding sand containing the composition and the application in casting |
| CN114890810A (en) * | 2022-04-18 | 2022-08-12 | 焦作诺尔曼炉业有限公司 | Rice hull morph-genetic structure mullite lightweight aggregate and preparation method thereof |
| CN115784721A (en) * | 2022-10-26 | 2023-03-14 | 中冶赛迪工程技术股份有限公司 | Aggregate for high-purity corundum refractory brick, and preparation method and application thereof |
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| CN102584289A (en) * | 2012-02-08 | 2012-07-18 | 武汉科技大学 | Mullite lightweight aggregate and preparation method thereof |
| CN102633512A (en) * | 2012-04-12 | 2012-08-15 | 武汉科技大学 | Abandoned molding sand based mullite light heat insulating bricks and preparation method thereof |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103449830A (en) * | 2013-08-26 | 2013-12-18 | 武汉科技大学 | Light-weight aluminum-silicon aggregate and preparation method thereof |
| CN104261849A (en) * | 2014-10-08 | 2015-01-07 | 江苏省陶瓷研究所有限公司 | Zirconium-containing mullite-high-silicon dioxide glass composite phase material and preparation method thereof |
| CN104261810A (en) * | 2014-10-08 | 2015-01-07 | 武汉科技大学 | Zirconium-containing mullite composite phase material and preparation method thereof |
| CN104310417A (en) * | 2014-10-08 | 2015-01-28 | 武汉科技大学 | Zirconium-containing cordierite complex phase material and preparation method thereof |
| CN104261810B (en) * | 2014-10-08 | 2016-03-30 | 武汉科技大学 | A kind of containing zirconium mullite composite diphase material and preparation method thereof |
| CN108339928A (en) * | 2017-11-01 | 2018-07-31 | 哈尔滨市易合铸造材料有限公司 | A kind of semi-coke compound powder, the molding sand containing the composition and the application in casting |
| CN114890810A (en) * | 2022-04-18 | 2022-08-12 | 焦作诺尔曼炉业有限公司 | Rice hull morph-genetic structure mullite lightweight aggregate and preparation method thereof |
| CN115784721A (en) * | 2022-10-26 | 2023-03-14 | 中冶赛迪工程技术股份有限公司 | Aggregate for high-purity corundum refractory brick, and preparation method and application thereof |
| CN115784721B (en) * | 2022-10-26 | 2023-11-03 | 中冶赛迪工程技术股份有限公司 | Aggregate for high-purity corundum refractory bricks and preparation method and application thereof |
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Application publication date: 20130501 |