Magnesium spinel refractory product

A refractory product, magnesia spinel technology, applied in the field of refractory materials, can solve the problems of easy deformation, environmental pollution, under-burning, etc., and achieve the effect of excellent hanging kiln skin performance

Inactive Publication Date: 2013-07-24
郑州瑞泰耐火科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sintering range of this process is narrow, and deformation, cracking, and under-burning are prone to occur during sintering, and the residual bricks after use contain hexavalent chromium, which seriously pollutes the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A magnesium spinel refractory product, which is prepared from aggregate, fine aggregate, powder and co-abrasive plus polyacrylic acid emulsion, dextrin and water according to the following weight ratio and method:

[0020] Ratio: 47 parts of aggregate, including 5 parts of iron-aluminum spinel with a particle size of 1-2 mm, 22 parts of high-purity magnesia with a particle size of 1-3 mm, and 20 parts of high-purity magnesia with a particle size of 3-5 mm. The mass percentage of the chemical composition of high-purity magnesia is : MgO≥97.1wt%, the chemical composition mass percentage of ferrite spinel is: Al 2 o 3 54-58%, Fe 2 o 3 39-44%; fine aggregate is 1-0.088mm in particle size; 15 parts of high-purity magnesia; powder is in particle size d 95 30 parts of fused magnesia <0.088mm, the chemical composition mass percentage of fused magnesia is: MgO≥98wt%; 8 parts of total abrasive, which is the co-grinding of iron scale, α-alumina and iron-aluminum spinel Powde...

Embodiment 2

[0026] A magnesium spinel refractory product, which is prepared from aggregate, fine aggregate, powder and co-abrasive plus polyacrylic acid emulsion, dextrin and water according to the following weight ratio and method:

[0027] Ratio: 46 parts of aggregate, including 4 parts of iron-aluminum spinel with a particle size of 1-2 mm, 24 parts of high-purity magnesia with a particle size of 1-3 mm, and 18 parts of high-purity magnesia with a particle size of 3-5 mm. The mass percentage of the chemical composition of high-purity magnesia is : MgO≥97.1wt%, the chemical composition mass percentage of ferrite spinel is: Al 2 o 3 54-58%, Fe 2 o 3 39-44%; fine aggregate is 1-0.088mm in particle size; 15 parts of high-purity magnesia; powder is in particle size d 95 32 parts of fused magnesia <0.088mm, the chemical composition mass percentage of fused magnesia is: MgO≥98wt%; 7 parts of total abrasive, which is co-grinding of iron scale, α-alumina and iron-aluminum spinel Powder, t...

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Abstract

The invention discloses a magnesium spinel refractory product which is prepared by the following steps of: reacting polyacrylic acid with a magnesium oxide containing material at the room temperature to generate magnesium polyacrylic acid, and reacting magnesium alumina spinel at high temperature reacts with a composite powder consisting of grinding iron alumina spinel, an active alumina micropowder and active iron oxide which are added in advance, so as to form a solid solution. The material of the magnesium spinel refractory product has high temperature resistance, and thermal shock resistance, and good property of adhering coating. The magnesium spinel refractory product can be used in large-size cement kiln calcining zones.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a magnesium spinel refractory product. Background technique [0002] With the rapid development of the cement industry and the successful application of dry decomposition technology outside the kiln, the cement kiln is becoming more and more productive and large-scale, the overall thermal load of the cement kiln system has increased, and the calcining zone of the cement kiln has more stringent requirements on the performance of refractory materials. Traditional materials directly combined with magnesia-chrome bricks are favored by cement companies for their excellent performance and long-term water retention. With the gradual improvement of national environmental protection policies, the residual bricks directly combined with magnesia-chrome bricks after use will cause environmental pollution due to the highly toxic hexavalent chromium. Gradually banned by the state....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 郑建立李全有赵洪亮万远翔李沅锦
Owner 郑州瑞泰耐火科技有限公司
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