Mullite brick used for furnace bottom of COREX furnace and its production method

A technology for mullite bricks and mullite homogeneous materials, which is applied in the field of mullite bricks for COREX furnace bottoms and their preparation, can solve the problems of mining rich and abandoning poverty, waste of resources, indiscriminate mining and indiscriminate digging, etc. The effect of high strength and low porosity

Active Publication Date: 2014-07-16
TONGDA REFRACTORY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] According to the current phenomenon of random mining and indiscriminate mining of bauxite resources in my country, the phenomenon of mining the rich and abandoning the poor, the phenomenon of resource waste and serious damage

Method used

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  • Mullite brick used for furnace bottom of COREX furnace and its production method
  • Mullite brick used for furnace bottom of COREX furnace and its production method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Mullite bricks for the furnace bottom of the COREX furnace of the present invention, in terms of weight percentage, its preparation raw materials are composed of: mullite homogeneous material 50%, white corundum 15%, andalusite 20%, a-Al 2 o 3 10% flour, 3-5% clay, plus 2% pulp waste liquid (the proportion of lignin in pulp waste liquid is 1.2 g / cm 3 ).

[0027] The raw material mullite homogeneous material that adopts is prepared by the following method:

[0028] a. Using low-quality high-alumina bauxite as raw material, Al in high-alumina bauxite 2 o 3 The mass content of TiO is 50-80%. 2 The mass content of ≤2%, Fe 2 o 3 The mass content of ≤0.5%; high alumina bauxite according to Al 2 o 3 The content is different for sorting and grading, respectively crushing and multi-level homogenization, and then synthesizing Al according to different proportions 2 o 3 Mixture with a mass content of 68-72%;

[0029] b. Put the mixed material in step a in a ball mill, a...

Embodiment 2

[0035] Embodiment 2: basically the same as Embodiment 1, the difference is:

[0036] Mullite bricks for the furnace bottom of the COREX furnace of the present invention, in terms of weight percentage, its preparation raw materials are composed of: mullite homogeneous material 60%, white corundum 15%, andalusite 15%, a-Al 2 o 3 5% powder, 5% clay, plus 5% pulp waste liquid (the proportion of lignin in pulp waste liquid is 1.1 g / cm 3 ).

[0037] The raw material mullite homogeneous material 60% is composed of 6% mullite homogeneous material with a particle size of 3-5mm, 42% homogeneous mullite material with a particle size of 3-1mm and 12% mullite homogeneous material with a particle size <1mm;

[0038] The white corundum 15% is composed of 9% of white corundum with a particle size of 1-3mm, 3% of white corundum with a particle size of <1mm, and 3% of white corundum with a particle size of <0.074mm;

[0039] The 15% andalusite is composed of 10% andalusite with particle size<1...

Embodiment 3

[0042] Embodiment 3: basically the same as Embodiment 1, the difference is:

[0043] Mullite bricks for the bottom of the COREX furnace of the present invention, in terms of weight percentage, its preparation raw materials are composed of: mullite homogeneous material 70%, white corundum 10%, andalusite 10%, a-Al 2 o 3 Powder 6%, clay 4%, plus pulp waste liquid accounting for 4% of the total weight of the above raw materials (the proportion of lignin in pulp waste liquid is 1.3 g / cm 3 ).

[0044] The raw material mullite homogeneous material 70% is composed of 7% mullite homogeneous material with a particle size of 3-5mm, 56% homogeneous mullite material with a particle size of 3-1mm and 7% mullite homogeneous material with a particle size <1mm;

[0045] 10% of the white corundum is composed of 4% of white corundum with a particle size of 1-3mm, 4% of white corundum with a particle size of <1mm, and 2% of white corundum with a particle size of <0.074mm;

[0046] The andalus...

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Abstract

The invention relates to a mullite brick used for furnace bottom of a COREX furnace, which comprises the following raw materials: 50-70% of mullite homogenizing material, 10-20% of white corundum, 10-20% of andalusite, 5-10% of a-Al2O3, 3-5% of clay, and paper pulp waste liquid accounting for 2-5% of total weight of the above raw materials. The porosity of the mullite brick is low which is less than 16.5%, the compression strength is greater than 100MPa, the thermal shock stability is greater than 30 times, refractoriness under load is greater than 1678 DEG C, all indexes are superior to those of common domestic corundum mullite bricks, and the mullite brick provided by the invention has the characteristics of high mechanical strength, high temperature resistance, erosion resistance and scouring resistance.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a mullite brick for the bottom of a COREX furnace and a preparation method thereof. Background technique [0002] COREX smelting reduction ironmaking technology is one of the most striking cutting-edge development technologies in the contemporary world metallurgical industry, and is considered to be the most promising ironmaking production process to replace the traditional blast furnace. Its outstanding advantage is that a small amount or no coke is used in the production process, which can solve the global shortage of metallurgical coking coal; the pollutant content discharged by the COREX furnace is only 1-10% of the blast furnace process, which can greatly reduce environmental pollution and is conducive to environmental protection. The COREX furnace replaces the blast furnace to simplify the production process, greatly reduce the discharge of various ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 张积礼高长贺马淑龙夏文斌王治峰马飞周新功王浩杰金立鹏周伟张军杰孙艳粉于光蒋朋王金元曲睿磊
Owner TONGDA REFRACTORY TECH CO LTD
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