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Modified high-purity magnesium aluminate spinel composite brick and preparation method thereof

A technology of pure magnesia-aluminum spinel and aluminum spinel, which is applied in the field of modified high-purity magnesia-alumina spinel composite bricks and its preparation, can solve the problems of inability to adapt to the working conditions of RH furnace, short service life and high price , to achieve low shrinkage, improved working conditions, and strong antioxidant capacity

Inactive Publication Date: 2017-01-04
大石桥市中建镁砖有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Long-term use experience shows that acidic, neutral and carbon-containing refractory materials cannot adapt to the working conditions of RH furnaces, and only high-temperature fired magnesia-chrome bricks are suitable for lining materials. However, magnesia-chrome bricks contain Cr2O3 It will react with alkali metal oxides to produce toxic substances such as hexavalent compounds, which will cause serious pollution
[0003] With the strengthening of public awareness of environmental protection and the government's increasing emphasis on environmental pollution control, in recent years, the RH furnaces of several large steel mills in China have begun to use chromium-free magnesia spinel bricks, although they meet the requirements of RH refining equipment to process steel. requirements, but there are still problems such as high price and short service life

Method used

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  • Modified high-purity magnesium aluminate spinel composite brick and preparation method thereof
  • Modified high-purity magnesium aluminate spinel composite brick and preparation method thereof
  • Modified high-purity magnesium aluminate spinel composite brick and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The raw materials of the modified high-purity magnesia-aluminum spinel composite brick are prepared according to the following parts by weight.

[0033] Weigh high-purity sintered magnesia (model: MS99, MgO content 99.0%, SiO2 content 0.15%, Fe 2 O 3 Content 0.08%, CaO content 0.8%, AL 2 O 3 Content 0.09%) 53 parts, high-purity fused magnesia (model: DMS99, MgO≥99%) 22 parts, high-purity sintered magnesia-aluminum spinel (model: MAS76, MgO content 23%-24%, SiO 2 Content 0.12%, Fe2O3 content 0.05%, CaO content 0.30%, AL 2 O 3 Content 75%-76%) 10 parts and high-purity fused magnesia-aluminum spinel (model: MAS76, MgO content 23%-24%, SiO 2 Content 0.11%, Fe 2 O 3 Content 0.025%, CaO content 0.35%, AL 2 O 3 75%-76%), put it into a crusher for crushing, after crushing, add it to a ball mill for crushing, and then use a vibrating screen to screen out aggregates with a particle size of 5-150 mesh.

[0034] Weigh 3 parts of fused magnesia powder (model: DMS-97, MgO≥9...

Embodiment 2

[0042] The raw materials of the modified high-purity magnesia-aluminum spinel composite brick are prepared according to the following parts by weight.

[0043] Weigh high-purity sintered magnesia (Model: MS99, MgO content 99.0%, SiO 2 Content 0.15%, Fe2O3 content 0.08%, CaO content 0.8%, AL 2 O 3 Content 0.09%) 45 parts, high-purity fused magnesia (model: DMS99, MgO≥99%) 22 parts, high-purity sintered magnesia-aluminum spinel (model: MAS66, MgO content 33.5%, SiO 2 Content 0.3%, Fe 2 O 3 Content 0.15%, CaO content 0.62%, AL 2 O 3 Content 65.41%) 15 parts and high-purity fused magnesia-aluminum spinel (model: MAS76, MgO content 23%-24%, SiO 2 Content 0.11%, Fe 2 O 3 Content 0.025%, CaO content 0.35%, AL 2 O 3 75%-76%) 10 parts are put into a crusher for crushing, and after crushing, they are added to a ball mill for crushing.

[0044] Weigh 3 parts of fused magnesia powder (model: DMS-97, MgO≥97%, particle size 325 mesh), fused magnesia-aluminum spinel sand powder (m...

Embodiment 3

[0052] The raw materials of the modified high-purity magnesia-aluminum spinel composite brick are prepared according to the following parts by weight.

[0053] Weigh high-purity sintered magnesia (MgO content 99.0%, SiO 2 Content 0.15%, Fe 2 O 3 Content 0.08%, CaO content 0.8%, AL 2 O 3 Content 0.09%) 40 parts, high-purity fused magnesia (MgO≥99%) 22 parts, high-purity sintered magnesia-aluminum spinel (model: MAS76, MgO content 23%-24%, SiO 2 Content 0.12%, Fe 2 O 3 Content 0.05%, CaO content 0.30%, AL 2 O 3 Content 75%-76%) 23 parts and high-purity fused magnesia-aluminum spinel (model: MAS76, MgO content 23%-24%, SiO 2 Content 0.11%, Fe 2 O 3 Content 0.025%, CaO content 0.35%, AL 2 O 3 75%-76%) into the crusher for crushing, after crushing, add it to the ball mill for crushing, and then use a vibrating screen to screen out aggregates with a particle size of 5-150 mesh.

[0054] Weigh 3 parts of fused magnesia powder (model: DMS-97, MgO≥98%, particle size 325 me...

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Abstract

The invention belongs to the technical field of a high-grade refractory matter for metallurgy, coloring, glass and cement kilns, and preparation thereof, and particularly relates to a modified high-purity magnesium aluminate spinel composite brick and a preparation method thereof. Aggregate is prepared from the following raw materials in parts by weight: 65 to 80 parts of high-purity magnesia and 15 to 35 parts of high-purity magnesium aluminate spinel; powder materials are prepared from the following raw materials in parts by weight: 1 to 5 parts of fused magnesia powder, 1 to 5 parts of fused magnesia-alumina spinel, 1 to 3 parts of fused magnesia-alumina spinel micro powder, 1 to 3 parts of desilicication zirconia, 1 to 3 parts of titanium oxide, 0.1 to 0.5 part of sintering agents, 1 to 3 parts of active aluminum oxide micro powder and 3 to 4 parts of combining agents. The modified high-purity magnesium aluminate spinel composite brick has the advantages that the purity is high; the density is great; the strength is high; the high-temperature thermal shock stability is good; the corrosion resistant performance is high; the molten metal resistant and antioxidation capability is high; no harmful gas is exhausted; green refractory material standards are conformed. The preparation method is simple; the cost is low; no carbon and no chrome are discharged; no pollution occurs; practical applicability is realized.

Description

technical field [0001] The invention belongs to the technical field of high-grade refractory materials for metallurgy, non-ferrous, glass and cement kilns and their preparation, in particular to a modified high-purity magnesia-alumina spinel composite brick and a preparation method thereof. Background technique [0002] There are mainly RH, DH, VAD, VD, VOD, ASEA-SKF, LF, etc. in the out-of-furnace refining methods. Among them, the RH method is the most important one. It is a method that combines vacuum refining and molten steel circulation. A series of advantages such as short processing cycle, large production capacity, good refining effect and easy operation have been widely used in steel production. The RH refining unit has strict requirements on the vacuum stability, high temperature performance, erosion resistance, slag resistance and thermal shock resistance of refractory materials. The long-term use experience shows that acid, neutral and carbon-containing refractor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/443C04B35/622C04B35/636
CPCC04B35/66C04B35/443C04B35/622C04B35/6365C04B2235/3206C04B2235/3217C04B2235/3224C04B2235/3225C04B2235/3227C04B2235/3232C04B2235/3244C04B2235/77C04B2235/96C04B2235/9607C04B2235/9669C04B2235/9676C04B2235/9684
Inventor 唐家彬孙光
Owner 大石桥市中建镁砖有限公司
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