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Ultramicro kyanite refractory castable and application thereof

A technology of refractory castables and kyanite, applied in the field of refractory materials, can solve the problems of easy cracking of refractory castables

Active Publication Date: 2016-06-01
JIANGSU REFUTA NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect that refractory castables are easy to crack in the prior art, and provide an ultrafine kyanite refractory castable and its application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] An ultrafine kyanite refractory castable, the raw material and content of the ultrafine kyanite refractory castable are: 30% high alumina aggregate with a particle size of 3-5mm; 12% with a particle size of 1 ~3mm high-alumina bauxite aggregate; 21% high-alumina bauxite aggregate with a particle size of 0-1mm; 5% ultrafine kyanite (5μm, alumina content ≥ 50%, kyanite phase ≥ 70 %, the same below), 8% of α-Al2O3; 7% of sub-white corundum powder; 12% of calcium aluminate cement; 4.95% of barium sulfate; 0.05% of sodium hexametaphosphate. (Wherein the weight percentage of aluminum in the high-alumina bauxite aggregate is ≥75%; α-Al 2 o 3 Middle Al 2 o 3 Mass percentage ≥ 99%, particle size ≤ 320 mesh; sub-white corundum powder l 2 o 3 Mass percentage ≥ 98%, particle size ≤ 320 mesh; Al in calcium aluminate cement 2 o 3 Mass percentage ≥ 50%; BaSO in barium sulfate 4 Mass percentage ≥ 95%, particle size ≤ 200 mesh, the same below)

[0029] Put the micron-sized fine...

Embodiment 2

[0031] An ultrafine kyanite refractory castable, the raw material and content of the ultrafine kyanite refractory castable are: 40% high alumina aggregate with a particle size of 3-5 mm; 10% with a particle size of 1 ~3mm high alumina bauxite aggregate; 30% high bauxite aggregate with a particle size of 0~1mm; 3% ultrafine kyanite (10μm), 1% α-Al2O3; 3% sub-white Corundum powder; 5% calcium aluminate cement; 7% barium sulfate; 1% sodium hexametaphosphate.

[0032] Put the micron-sized fine powder in the ingredients of ultrafine kyanite, α-Al2O3 and sub-white corundum powder into a mixer such as a conical mixer or an inclined high-speed mixer, and make the micron-sized fine powder under high-speed mixing conditions. The fine powder disperses the ultrafine kyanite highly evenly to obtain a uniformly dispersed premixed powder. In the later stage, it will be put into the planetary mixer together with other raw materials (including aggregate, fine powder, admixture, etc.) for remi...

Embodiment 3

[0034] An ultrafine kyanite refractory castable, the raw material and content of the ultrafine kyanite refractory castable are: 17% high alumina aggregate with a particle size of 3-5 mm; 35% with a particle size of 1 ~3mm high-alumina bauxite aggregate; 11% high-alumina bauxite aggregate with a particle size of 0-1mm; 10% ultrafine kyanite (8μm), 11% α-Al2O3; 4% sub-white Corundum powder; 7% calcium aluminate cement; 2% barium sulfate; 3% sodium aluminate.

[0035] Put the micron-sized fine powder in the ingredients of ultrafine kyanite, α-Al2O3 and sub-white corundum powder into a mixer such as a conical mixer or an inclined high-speed mixer, and make the micron-sized fine powder under high-speed mixing conditions. The fine powder disperses the ultrafine kyanite highly evenly to obtain a uniformly dispersed premixed powder. In the later stage, it will be put into the planetary mixer together with other raw materials (including aggregate, fine powder, admixture, etc.) for rem...

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Abstract

The invention belongs to the field of refractory materials and discloses an ultramicro kyanite refractory castable. The ultramicro kyanite refractory castable comprises, by weight, 47-80 parts of high alumina bauxite aggregate, 10-40% of alumina powder, 0.05-3% of admixture and 3-10% of ultramicro kyanite, content of alumina in the ultramicro kyanite is greater than or equal to 50%, kyanite phase is greater than or equal to 70%, and granularity is less than or equal to 10 um. Through premixing technology, ultramicro kyanite is mixed with alpha-Al2O3 and sub-white corundum powder, so that ultramicro kyanite can be uniformly dispersed in a matrix; ultramicro kyanite plays a role in offsetting structural contraction caused by high-temperature contraction of alumina or high-temperature decomposition of aluminum corrosion resisting agent through structural expansion of highly-uniformly-dispersed kyanite at 1250 DEG C. Ultramicro kyanite is used, and when grain diameter is reduced to 5 um, size expansion rate of ultramicro kyanite is lower than 3%; kyanite has high aluminum corrosion resistance, so that when same water adding quantity and fluidity are maintained, aluminum corrosion resistance of refractory lining materials can be improved greatly.

Description

technical field [0001] The invention belongs to the field of refractory materials, in particular to an ultrafine kyanite refractory castable and its application. Background technique [0002] High-alumina refractory castables for lining of aluminum and aluminum alloy casting equipment are synthesized by high-alumina refractory aggregate, alumina powder, binder and admixture in a certain ratio. It has the characteristics of good high temperature performance, high refractoriness, and wear resistance, and is widely used in hardware, smelting, chemical, non-ferrous metal and other industries. At present, the production method of high alumina refractory castable is mainly mixed with high alumina bauxite clinker, alumina powder, silica powder and appropriate binder. Although the high-alumina bauxite clinker has been fired, it is far from reaching the sintering equilibrium state. In the subsequent heating process, there is still a tendency to transition from the unequilibrium stat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/101C04B35/622
CPCC04B35/101C04B35/622C04B2235/9676
Inventor 宋学斌李连地
Owner JIANGSU REFUTA NEW MATERIALS CO LTD
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