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A microporous chromium-free unfired brick having high thermal shock resistance and used for an RH refining furnace and a preparing method thereof

A refining furnace and microporous technology, which is applied in the field of high thermal shock microporous chromium-free non-burning bricks of RH refining furnaces and their preparation, achieves the effects of less environmental pollution, good slag resistance and improved slag erosion resistance.

Active Publication Date: 2017-12-15
TONGDA REFRACTORY TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: in view of the need to further improve the thermal shock resistance stability of the existing ordinary chromium-free non-burning bricks, the present invention provides a new RH refining furnace high thermal shock microporous chrome-free non-burning brick Brick and method for its preparation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The high thermal shock microporous chrome-free non-burning brick of the RH refining furnace of the present invention is represented by weight percentage, and is composed of 25% of the microporous fused fused magnesium aluminum composite material of 5-3 mm in raw material, and 3-1 mm microporous fused magnesia-aluminum synthetic material. Material 25%, 1 ~ 0mm microporous fused magnesium aluminum synthetic material 20%, 200 mesh microporous fused magnesium aluminum synthetic material 20%, particle size 325 mesh fused magnesium aluminum spinel 7% and 200 mesh metal aluminum powder 3% composition; In addition, add the thermosetting phenolic resin that accounts for 2.8% of above-mentioned raw material gross weight;

[0031] The microporous fused magnesium aluminum composite material is prepared by the following method:

[0032] (1) Expressed in weight percent, the raw material composition of the microporous fused magnesia-aluminum composite material is: 85% of light-burned ...

Embodiment 2

[0036] The high thermal shock microporous chrome-free non-burning brick of the RH refining furnace of the present invention is represented by weight percentage, and is composed of 25% of the microporous fused fused magnesium aluminum composite material of 5-3 mm in raw material, and 3-1 mm microporous fused magnesia-aluminum synthetic material. Material 25%, 1 ~ 0mm microporous fused magnesium aluminum synthetic material 20%, 200 mesh microporous fused magnesium aluminum synthetic material 18%, particle size 325 mesh fused magnesium aluminum spinel 7% and 200 mesh metal aluminum powder 5% composition; In addition, add the thermosetting phenolic resin that accounts for 2.8% of above-mentioned raw material gross weight;

[0037] The microporous fused magnesium aluminum composite material is prepared by the following method:

[0038] (1) In terms of weight percentage, the raw material composition of the microporous fused magnesia-aluminum composite material is: 90% of light-burne...

Embodiment 3

[0042] The high thermal shock microporous chrome-free non-burning brick of the RH refining furnace of the present invention is represented by weight percentage, and is composed of 25% of the microporous fused fused magnesium aluminum composite material of 5-3 mm in raw material, and 3-1 mm microporous fused magnesia-aluminum synthetic material. Material 25%, 1 ~ 0mm microporous fused magnesium aluminum synthetic material 20%, 200 mesh microporous fused magnesium aluminum synthetic material 16%, particle size 325 mesh fused magnesium aluminum spinel 7% and 200 mesh metal aluminum powder 7% composition; In addition, add the thermosetting phenolic resin that accounts for 2.8% of above-mentioned raw material gross weight;

[0043] The microporous fused magnesium aluminum composite material is prepared by the following method:

[0044] (1) Expressed in weight percent, the raw material composition of the microporous fused magnesia-aluminum composite material is: 80% of light-burned ...

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Abstract

A microporous chromium-free unfired brick having high thermal shock resistance and used for an RH refining furnace and a preparing method thereof are disclosed. Main raw materials of the chromium-free unfired brick include microporous fused magnesite-alumina synthetic composite materials having various particle sizes, fused magnesium aluminate spinel having a particle size of 325 meshes, and metal aluminum powder having a size of 200 meshes. In addition, thermosetting phenolic resin is added and adopted as a binding agent. Firstly, weighed raw materials are added into an intensive sand mixer and premixed to obtain a material mixture; the material mixture is added into an assembled mould and subjected to compression moulding; and a moulded green brick is put into a drier and subjected to heat treatment to obtain the microporous chromium-free unfired brick. The product is suitable as a refractory material used for the RH refining furnace. Compared with common chromium-free unfired brick, the microporous chromium-free unfired brick has excellent thermal shock resistance, erosion resistance and penetration resistance, the service lifetime of the RH refining furnace is obviously prolonged, the production efficiency of a steel plant is increased and the microporous chromium-free unfired brick has significant economic benefit and social benefit.

Description

technical field [0001] The invention relates to a refractory material for refining outside a furnace, in particular to a high thermal shock microporous chromium-free non-burning brick for an RH refining furnace and a preparation method thereof. Background technique [0002] The main parts of the RH refining furnace are called according to their different functions and positions in the refining outside the furnace: dip tube, circulation tube, lower tank, middle tank (including alloy feeding port), upper tank, hot top cover ( Also known as hot bend pipe) (including manholes) and other parts, the key parts are the dipping pipe, circulation pipe, and lower tank, which are also vulnerable parts. [0003] In order to cooperate with the "green refractories" strategy and realize "excellent varieties and quality, resource and energy conservation, environmental protection in the production process, and harmless use process", in recent years, the refractories for RH refining furnaces h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B38/08C04B38/02
CPCC04B35/66C04B38/085C04B2235/3206C04B2235/3217C04B2235/3222C04B2235/402C04B2235/6562C04B2235/77C04B2235/96C04B38/0074C04B38/02
Inventor 孔祥魁张积礼马淑龙倪高金高长贺孙艳粉吕雪锋王治峰马飞周新功王浩杰
Owner TONGDA REFRACTORY TECH CO LTD
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