High thermal shock abrasive brick for dry quenched coke oven chute pillar and manufacture method

A technology of a CDQ oven and a production method, which are applied in the field of high thermal shock wear-resistant bricks for a CDQ oven ramp column, can solve the problem that the thermal shock stability, high temperature flexural strength and normal temperature compressive strength cannot be adapted to the CDQ oven The requirements of chute working conditions, the poor physical properties of mullite-silicon carbide refractory bricks, and the limitation of the production capacity of the CDQ system have achieved the effect of excellent performance indicators, strong wear resistance, and good thermal shock resistance.

Inactive Publication Date: 2007-03-14
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] From the physical and chemical indicators in Table 1, it can be seen that the physical properties of the above-mentioned mullite-silicon carbide refractory bricks are poor, especially the most critical physical and chemical indicators such as thermal shock stability, high temperature flexural strength, and normal temperature compressive strength.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: According to the weight percentage of each component in the final product high thermal shock wear-resistant brick: silicon carbide 74%, silicon nitride 22.5%, aluminum sulfate 2.6%, ytterbium oxide 0.2%, cerium oxide 0.2%, trioxide Various raw materials are prepared with a ratio of 0.5% of Fe2. First, the base material silicon carbide, silicon nitride, additives ytterbium oxide and cerium oxide are evenly mixed and granulated, and then aluminum sulfate is added to make the aluminum sulfate evenly cover the surface of the formed particles. The granules formed after the raw materials are mixed The diameter is not more than 2.5mm. Then put the mixed raw materials into the steel mold, at 120N / mm 2 Under certain pressure conditions, it is pressed into corresponding green bricks. The green bricks are then placed in a drying furnace and dried at a temperature of 250°C. Finally, the dried green bricks are placed in a kiln, and sintered under nitrogen protection at...

Embodiment 2

[0023] Example 2: According to the weight percentage of each component in the final product high thermal shock wear-resistant brick: silicon carbide 65%, silicon nitride 32.3%, aluminum sulfate 1.2%, ytterbium oxide 0.4%, cerium oxide 0.3%, trioxide Various raw materials are prepared with a ratio of 0.8% of Fe2. First, the base material silicon carbide, silicon nitride, additives ytterbium oxide and cerium oxide are evenly mixed and granulated, and then aluminum sulfate is added to make the aluminum sulfate evenly cover the surface of the formed particles. The granules formed after the raw materials are mixed The diameter is not more than 2.5mm. Then put the mixed raw materials into the steel mold, at 140N / mm 2 Under certain pressure conditions, it is pressed into corresponding green bricks. Then put the green bricks in a drying furnace and dry them at a temperature of 260°C. Finally, the dried green bricks are placed in a kiln, and sintered under nitrogen protection at a t...

Embodiment 3

[0024] Example 3: According to the weight percentage of each component in the final product high thermal shock wear-resistant brick: silicon carbide 77%, silicon nitride 21%, aluminum sulfate 1.2%, ytterbium oxide 0.2%, cerium oxide 0.2%, trioxide Various raw materials are prepared with a ratio of 0.4% of Fe2. First, the base material silicon carbide, silicon nitride, additives ytterbium oxide and cerium oxide are evenly mixed and granulated, and then aluminum sulfate is added to make the aluminum sulfate evenly cover the surface of the formed particles. The granules formed after the raw materials are mixed The diameter is not more than 2.5mm. Then put the mixed raw materials into the steel mold, at 100N / mm 2 Under certain pressure conditions, it is pressed into corresponding green bricks. Then put the green bricks in a drying furnace and dry them at a temperature of 280°C. Finally, the dried green bricks are placed in a kiln, and sintered under nitrogen protection at a tem...

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Abstract

The present invention discloses one kind of abrasive brick with high thermal shock resistance for use in dry quenching coke oven and its making process. The abrasive brick is made with the materials including silicon carbide 62-80 wt%, silicon nitride 17-35 wt%, inorganic adhesive 0.4-3 wt%, lanthanide oxide 0.1-0.8 wt% and ferric oxide impurity less than 1.0 wt%, and has high thermal shock stability and normal temperature pressure strength higher than 120 MPa. The making process includes the steps of mixing all the materials, pressing at 75-125 N/sq mm pressure to form adobe, stoving the adobe at 100-300 deg.c and final sintering in a kiln at 1380-1420 deg.c under the protection of nitrogen. The abrasive brick with high thermal shock resistance has long service life.

Description

technical field [0001] The invention relates to a material for manufacturing a CDQ coke oven chute column used in iron and steel smelting enterprises, in particular to a high thermal shock wear-resistant brick for a CDQ coke oven chute column and a manufacturing method thereof. Background technique [0002] CDQ is a coke quenching method used by iron and steel smelting enterprises to cool red coke with inert gas in CDQ ovens. The method can make full use of the sensible heat of red coke, significantly improve the quality of coke, effectively save energy, greatly reduce the emission of harmful substances, and maintain the atmospheric environment. At present, in the domestic large-scale CDQ system with a processing capacity of more than 120t / h, the restrictive link that affects the production capacity is the damage of the column of the CDQ coke oven chute. Taking the CDQ system of Wuhan Iron and Steel (Group) Company as an example, the coke processin...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/622
Inventor 张亦平潘立慧李世明吕永劲盛军波涂庆胜朱天喜邓棠
Owner 武汉钢铁有限公司
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