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Low chromium fused recombination composite magnesia-chrome brick

A technology of fused magnesium and recombination, applied in the field of refractory materials, can solve the problems of inability to form a protective layer of slag, weak reducibility, etc., and achieve the effects of avoiding adverse effects, improving environmental protection, and facilitating production management.

Active Publication Date: 2019-04-09
RUITAI MATERIALS TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many non-ferrous industrial kilns have poor environmental reducibility and cannot form a slag protective layer, so they have to use refractory materials such as fused magnesia-chrome bricks containing chromium oxide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The content of MgO is 65%, Cr 2 o 3 Fused magnesia chrome sand and Cr with a content of 20% 2 o 3 46% chrome concentrate and Al 2 o 3 Fused magnesia-aluminum spinel with a content of about 68% and a MgO content of about 32% is the main raw material, and can be produced as Cr by using the following ratio 2 o 3 Low-chrome magnesia-chrome brick with a theoretical content of 7.6%: 5% fused magnesia chrome sand for 5-2mm, 20% fused magnesia aluminum spinel for 5-2mm, 12% fused magnesia chrome sand for 2-1mm, 12% fused magnesia chrome sand for 2-1mm Fused magnesia aluminum spinel 10%, 1-0.088mm fused magnesia chrome sand 5%, 1-0.088mm fused magnesia aluminum spinel 5%, 1-0.088mm chrome concentrate 7%, 3 =3.29, apparent porosity=14.1%, and soft T 0.6 ≥1700°C, thermal shock stability 1100°C water cooling ≥4 times, the product has high temperature resistance and thermal shock resistance that meet the requirements.

Embodiment 2

[0031] The content of MgO is 65%, Cr 2 o 3 Fused magnesia chrome sand and Cr with a content of 20% 2 o 3 46% chrome concentrate and Al 2 o 3 Fused magnesia-aluminum spinel with a content of about 68% and a MgO content of about 32% is the main raw material, and can be produced as Cr by using the following ratio 2 o 3 Low-chrome magnesia-chrome brick with a theoretical content of 12.1%: 5-2mm fused magnesia-chrome sand 17%, 5-2mm fused magnesia-aluminum spinel 15%, 2-1mm fused magnesia-chrome sand 10%, 2-1mm fused magnesia-chrome sand Fused magnesia aluminum spinel 5%, 1-0.088mm fused magnesia chrome sand 8%, 1-0.088mm fused magnesia aluminum spinel 2%, 1-0.088mm chrome concentrate 11%, 3 , Apparent porosity=14.3%, Heruan T 0.6 ≥1700°C, thermal shock stability 1100°C water cooling ≥5 times, the product has high temperature resistance and thermal shock resistance that meet the requirements.

Embodiment 3

[0033] The content of MgO is 65%, Cr 2 o 3 Fused magnesia chrome sand and Cr with a content of 20% 2 o 3 46% chrome concentrate and Al 2 o 3 Fused magnesia-aluminum spinel with a content of about 68% and a MgO content of about 32% is the main raw material, and can be produced as Cr by using the following ratio 2 o 3Low-chrome magnesia-chrome brick with a theoretical content of 9.3%: 5-2mm fused magnesia-chrome sand 10%, 5-2mm fused magnesia-aluminum spinel 15%, 2-1mm fused magnesia-chrome sand 15%, 2-1mm fused Fused magnesia aluminum spinel 6%, 1-0.088mm fused magnesia chrome sand 17%, 1-0.088mm fused magnesia aluminum spinel 4%, 1-0.088mm chrome concentrate 2%, 3 , Apparent porosity=16.4, Heruan T 0.6 ≥1700°C, thermal shock stability 1100°C water cooling ≥5 times, the product has high temperature resistance and thermal shock resistance that meet the requirements.

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Abstract

The invention provides a fused recombination composite spinel refractory brick with low chromium oxide content, which is applied to smelting industries. On the one hand, during batching, fused magnesia-alumina spinel sand is used for substantially replacing fused magnesia-chrome sand, especially coarse-grained fused magnesia-chrome sand, so that the content of chromium oxide is substantially reduced while the adverse effect of erosion resistance is avoided. On the other hand, the fused magnesia-chrome sand or the magnesia-alumina spinel sand of various particle sizes generated by crushing is used as much as possible, so that the production management is facilitated, thus, the pollution of hexavalent chromium is reduced while the production and the service life are not affected, and the beneficial effect of improving the environmental protection is achieved.

Description

technical field [0001] The invention belongs to the field of refractory materials, and mainly relates to an electrofusion rebonded magnesium-chromium-magnesium-aluminum spinel brick. Background technique [0002] Magnesia-chrome brick is a refractory material made by adding chromite ore or pre-synthesized magnesia-chrome sand to magnesia. It is widely used in harsh parts of non-ferrous and steel smelting kilns. Sintered magnesia-chrome bricks are divided into four categories: ordinary magnesia-chrome bricks, directly combined magnesia-chrome bricks, semi-recombined magnesia-chrome bricks, and recombined magnesia-chrome bricks. [0003] Ordinary magnesia-chrome bricks are refractory products made of ordinary magnesia and general refractory grade chrome ore as raw materials and fired at high and high temperatures. [0004] Direct bonded magnesia-chrome bricks are refractory products fired at high temperature with high-purity magnesia and chrome concentrate as the main raw mat...

Claims

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Application Information

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IPC IPC(8): C04B35/047
CPCC04B35/0476C04B2235/3222C04B2235/3241C04B2235/96C04B2235/9607C04B2235/77
Inventor 周严敦王杰曾吴兴胜徐琳琳王俊涛胡建辉
Owner RUITAI MATERIALS TECHNOLOGY CO LTD
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