Dry type magnesium-calcium gravity flow fire-resistant material and preparation thereof

A refractory material, magnesium-calcium technology, applied in the field of refractory materials, can solve the problems affecting the turnover rhythm of steel drums, etc., and achieve the effect of improving spreading effect, convenient use and improving flow performance

Inactive Publication Date: 2009-06-24
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, the molten steel impact area of ​​the refining vessel outside the furnace with the ladle as the core often needs online maintenance to prolong the service life of the ladle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A dry-type magnesia-calcium self-flowing refractory material and its preparation method, the technical proposal is: 20-30wt% fused magnesia-calcium sand, 30-40wt% fused magnesia, 15-20wt% forsterite 10-15% by weight of monohydrate sodium silicate particles, 1-2% by weight of silicon dioxide fine powder, 4-5% of limestone fine powder, and 1-2% of dihydrogen phosphate sodium particles are prepared by stirring and mixing.

[0025] The material is not molded, and after being treated at 1300°C for 10 minutes, the porosity of the material obtained after natural cooling is 33.4%, and the bulk density is 2.01g / cm 3 .

Embodiment 2

[0027] A dry-type magnesia-calcium self-flowing refractory material and its preparation method, the technical proposal is: 30-35wt% fused magnesia-calcium sand, 20-30wt% fused magnesia, 10-15wt% forsterite 15-20% by weight of sodium silicate dihydrate particles, 2-4% by weight of silicon dioxide fine powder, 3-4% of limestone fine powder and 2-3% of sodium tripolyphosphate particles are prepared by stirring and mixing.

[0028] The material is not formed, and after being treated at 1300°C for 10 minutes, the porosity of the material obtained after natural cooling is 29.4%, and the bulk density is 2.22g / cm 3 .

Embodiment 3

[0030] A dry-type magnesia-calcium self-flowing refractory material and its preparation method, the technical proposal is: 35-40wt% fused magnesia-calcium sand, 15-20wt% fused magnesia, 5-10wt% forsterite 20-25% by weight of sodium silicate trihydrate particles, 4-6% by weight of silicon dioxide fine powder, 2-3% of limestone fine powder and 3-4% of sodium hexametaphosphate particles are prepared by stirring and mixing.

[0031] The material is not formed, and after being treated at 1300°C for 10 minutes, the porosity of the material obtained after natural cooling is 28.4%, and the bulk density is 2.28g / cm 3 .

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Abstract

The invention relates to a dry magnesia-calcia free-flowing refractory material and a preparation method thereof. The adopted technical proposal is as follows: the refractory material is prepared by stirring and mixing 20-50wt% of electrocast magnesia-calcia clinker or sintered magnesia-calcia clinker, 10-40wt% of electrocast magnesia or sintered magnesia, 0.5-20wt% of forsterite, 10-30wt% of sodium silicate hydrate particles, 1-8wt% of fine silicon dioxide powder, 0.5-5% of fine limestone powder and 1-5% of polyphosphate sodium particles. The dry magnesia-calcia free-flowing refractory material prepared by the method has good fluidity and fire resistance, convenient site operation and use and no environmental pollution and can be used for quickly patching a liner material of a smelting furnace.

Description

technical field [0001] The invention belongs to the technical field of refractory materials. In particular, it relates to a dry-type magnesia-calcium self-flowing refractory material and a preparation method thereof. Background technique [0002] Environmental protection is a major issue facing the production and application of refractory materials. At present, most of the repair materials for metallurgical furnace linings use organic binders. Harmful smoke and dust are easily generated during sintering, causing serious pollution to the atmosphere and endangering the health of construction workers. On the one hand, refractory materials for repair and maintenance used on site usually need to be added with water or other liquid binders. The construction process is relatively complicated and the labor intensity of workers is high. The research work we are doing now is to solve this practical problem by improving the binder and adding appropriate admixtures. The developed mate...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 魏耀武李楠何成叶超
Owner WUHAN UNIV OF SCI & TECH
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