Corundum-mullite composite brick for COREX furnace and preparation method thereof

A technology of mullite and composite bricks, applied in the field of corundum mullite composite bricks for COREX furnaces and its preparation, to achieve high cost performance, high thermal shock resistance, and good development effects

Active Publication Date: 2014-06-25
TONGDA REFRACTORY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: the present invention provides a corundum-mullite composite brick for COREX furnace and its preparation method in view of the existing technical problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The corundum-mullite composite brick for the COREX furnace of the present invention is represented by weight percentage. The raw material composition of the corundum-mullite composite brick is: 40% of corundum-mullite homogeneous material, 40% of white corundum, and 5% of andalusite , a-Al 2 o 3 10% powder and 5% bonded clay; plus 3% pulp waste liquid (the proportion of lignin in pulp waste liquid is 1.3 g / cm 3 ).

[0033] The raw material corundum mullite homogeneous material used is prepared by the following method:

[0034] a, with high alumina bauxite and industrial alumina as raw materials (Al in the high alumina bauxite 2 o 3 The mass percentage of TiO is 75-85%. 2 The mass content of ≤2.0%, Fe 2 o 3 The mass content of ≤1.0%; Al in the industrial alumina 2 o 3 mass percentage>95%), the high alumina bauxite according to Al 2 o 3 The mass content is 75-80% and 80-85% for selection and classification. After the high-bauxite of each grade is crushed to 2 o...

Embodiment 2

[0039] Embodiment 2: basically the same as Embodiment 1, the difference is:

[0040] The corundum-mullite composite brick for the COREX furnace of the present invention is expressed in weight percent. The raw material composition of the corundum-mullite composite brick is: 50% of corundum-mullite homogeneous material, 30% of white corundum, and 10% of andalusite , a-Al 2 o 3 powder 6% and bonded clay 4%; plus 5% pulp waste liquor (the proportion of lignin in pulp waste liquor is 1.2 g / cm 3 ).

[0041] The difference between the raw material corundum mullite homogeneous material preparation method and embodiment 1 is:

[0042] In step b: drying the obtained mud body, the drying temperature is 100°C, the drying time is 50h, the moisture content of the obtained mud body after drying is <0.5%, and then enters the tunnel kiln for firing, and the firing temperature is 1500°C, heat preservation for 10h at the sintering temperature.

[0043] 50% of the corundum mullite homogeneou...

Embodiment 3

[0045] Embodiment 3: basically the same as Embodiment 1, the difference is:

[0046] The corundum-mullite composite brick for the COREX furnace of the present invention is represented by weight percentage. The raw material composition of the corundum-mullite composite brick is: 60% of corundum-mullite homogeneous material, 20% of white corundum, and 8% of andalusite , a-Al 2 o 3 9% powder and 3% bonded clay; plus 3% pulp waste liquid (the proportion of lignin in pulp waste liquid is 1.3 g / cm 3 ).

[0047] The difference between the raw material corundum mullite homogeneous material preparation method and embodiment 1 is:

[0048] In step b: drying the obtained mud body, the drying temperature is 200 ° C, the drying time is 30 hours, the moisture content of the obtained mud body after drying is <0.5%, and then enters the tunnel kiln for firing, and the firing temperature is 1650°C, heat preservation for 8 hours at the sintering temperature.

[0049] 60% of the corundum mul...

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Abstract

The invention discloses a corundum-mullite composite brick for a COREX furnace and a preparation method thereof. The raw materials of the corundum-mullite composite brick are composed of a corundum-mullite homogenized material, white corundum, andalusite, a-Al2O3 powder and binding clay, as well as paper pulp liquid waste. The preparation method comprises the steps of firstly, preparing raw materials with various particle sizes according to the ratio; then, using raw materials with particle sizes of 1-3mm and particle sizes smaller than 1mm as aggregate to perform dry mixing, adding a paper pulp liquid waste mixture, finally adding the residual raw materials, and milling to obtain a pug; sequentially performing material trapping, press forming and drying on the obtained pug, and finally roasting to obtain a product. The corundum-mullite composite brick produced in the invention has very low porosity, high compression strength and excellent thermal shock resistance and corrosion resistance, can completely satisfy the harsh application environment of the COREX furnace, and can prolong the service life.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a corundum-mullite composite brick for 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 v...

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王治峰夏文斌马飞金立鹏周伟张军杰孙艳粉于光蒋朋周新功王浩杰王金元曲睿磊
Owner TONGDA REFRACTORY TECH CO LTD
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