High-performance mullite castable and preparation method thereof

A castable and mullite technology, which is applied in the field of high-performance mullite castables and their production, can solve the problems of low refractoriness and softening temperature under load, structural spalling, and low content of main components, and achieve thermal shock stability. Good performance, increased service life, good volume stability

Pending Publication Date: 2021-06-04
河南众投冶金材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional formula and production process are difficult to balance the thermal shock stability and wear resistance while improving the refractoriness of castables.
Sintered mullite is usually used as the aggregate for mullite castables with traditional craft formulas. The content of main components in sintered mullite is low, so the refractoriness and load softening temperature of the product are usually not high, and the thermal shock stability is poor. Structural peeling is prone to occur during use, reducing the service life of the refractory cast lining

Method used

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  • High-performance mullite castable and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Weigh 65 kg of fused mullite aggregate (grain size is 0-15mm, aluminum oxide content is greater than 70%, silicon dioxide content is greater than 26%), white corundum powder (grain size is 200 mesh, Aluminum content greater than 99%) 15 kg, zirconium silica powder (silica content greater than 92%, zirconia content greater than 3%) 5 kg, calcined alumina fine powder (particle size is 325 mesh, aluminum oxide content greater than 98.5%) ) 5 kg, fused pure calcium aluminate cement (alumina content greater than 70%) 3 kg, kyanite powder (alumina content greater than 57%) 2.5 kg, sillimanite powder (alumina content greater than 58%) 2.5 kg, zircon powder (325 mesh in particle size, zirconia content not less than 65%) 2 kg, nano calcium carbonate powder (particle size 25-100 nm, calcium carbonate content greater than 90%) 0.2 kg, 0.2 kg of polycarboxylate superplasticizer;

[0029] 2) Mix the powder with a powder mixer for more than 3 minutes until uniform.

[0030] 3) P...

Embodiment 2

[0032] 1) Weigh 68 kg of fused mullite aggregate, 13 kg of white corundum powder, 4 kg of zirconium silicon powder, 5 kg of calcined alumina powder, 3 kg of fused pure calcium aluminate cement, 2.5 kg of kyanite powder, silicon 2.5 kg of thread stone powder, 2 kg of zircon powder, 0.2 kg of nano-calcium carbonate powder, and 0.2 kg of polycarboxylate superplasticizer;

[0033] 2) According to the method of Example 1, 100 kg of this high-performance mullite castable was prepared.

Embodiment 3

[0035] 1) Weigh 70 kg of fused mullite aggregate, 12 kg of white corundum powder, 4 kg of zirconium silicon powder, 4 kg of calcined alumina powder, 3 kg of fused pure calcium aluminate cement, 2.5 kg of kyanite powder, silicon 2.5 kg of thread stone powder, 2 kg of zircon powder, 0.2 kg of nano-calcium carbonate powder, and 0.2 kg of polycarboxylate superplasticizer;

[0036] 2) According to the method of Example 1, 100 kg of this high-performance mullite castable was prepared.

[0037] According to this formula and configuration method, the prepared castables are vibrated and molded to make a 40×40×160mm strip test block, dried at 110°C for 24 hours, and then fired at 1450°C×1 hour in the air to measure the high temperature resistance. Flexural strength; after firing at 1450°C for 3 hours, measure its bulk density, apparent porosity, flexural strength, linear change rate and mass change rate. Compared with ordinary castables, the results are as follows:

[0038]

[0039...

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Abstract

The invention belongs to the technical field of refractory materials, and particularly relates to a high-performance mullite castable and a preparation method thereof. The high-performance mullite castable comprises the following raw material components in percentage by weight: 65-75% of electrically fused mullite aggregate, 10-20% of white corundum powder, 1-8% of zirconium silicon micropowder, 2-10% of calcined alumina powder, 1-5% of electrically fused pure calcium aluminate cement, 2-5% of kyanite powder, 2-5% of sillimanite powder, and 1-6% of zirconite powder. The total weight percentage of the raw materials of the high-performance mullite castable is 100%, and nano calcium carbonate accounting for 0.1-1% of the total weight of the raw materials and a polycarboxylate superplasticizer accounting for 0.1-0.5% of the total weight of the raw materials are added to the high-performance mullite castable. The castable disclosed by the invention has high refractoriness and thermal shock resistance, the high-temperature wear resistance is greatly improved, the high-temperature performance and the use performance of a traditional castable are improved, and the problem that the castable is easy to peel off in the use process is solved.

Description

technical field [0001] The invention belongs to the technical field of unshaped refractory materials, and is used for pouring construction of refractory lining materials for industrial kilns such as iron and steel, coking, and nonferrous metals, and in particular relates to a high-performance mullite castable and a production method thereof. Background technique [0002] The use conditions of refractory castables are becoming more and more stringent, and the requirements for the comprehensive performance of refractory castables under high temperature conditions are also getting higher and higher. Refractory castables are required to have high wear resistance, high refractoriness and high thermal shock stability at the same time. However, the traditional formula and production process are difficult to balance the thermal shock stability and wear resistance while improving the refractoriness of castables. Sintered mullite is usually used as the aggregate for mullite castables ...

Claims

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Application Information

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IPC IPC(8): C04B35/66
CPCC04B35/66C04B2235/3463C04B2235/3217C04B2235/3427C04B2235/3222C04B2235/3208C04B2235/77C04B2235/96C04B2235/9607
Inventor 张红林吕韬
Owner 河南众投冶金材料有限公司
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