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Magnesium-chromium composite spinelle brick

A magnesia-chromium spinel and spinel brick technology, which is applied in the field of magnesia-chromium composite spinel bricks, can solve problems such as increased production cost, and achieve the effects of improved spalling resistance, increased oxygen partial pressure, and high content

Active Publication Date: 2009-10-14
ZHENGZHOU HUAWEI REFRACTORIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The refractory bricks used in industrial kilns such as RH furnaces, AOD furnaces, and VOD furnaces outside the furnace are required to have a compact structure and have good thermal shock resistance, corrosion resistance, and peeling resistance. The service life of permanent refractory materials, my country has been relying on imports for a long time, which directly led to the increase of production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The magnesia-chrome composite spinel brick of the present invention is prepared from materials magnesia-chrome spinel sand, magnesia, chrome concentrate and chromium oxide according to the following steps:

[0038] The first step is to select the material by weight percentage as:

[0039] a. 1# Synthetic magnesia chrome spinel sand material:

[0040] Take MgO: 65; Cr 2 o 3 : 25; SiO 2 : 0.8; Fe 2 o 3 : 6; Al 2 o 3 : 2; CaO: 1.2;

[0041] b. 2# Synthetic magnesia chrome spinel sand material:

[0042] Take MgO: 55; Cr 2 o 3 : 35; SiO 2 : 0.8; Fe 2 o 3 : 6; Al 2 o 3 : 2; CaO: 1.2;

[0043] c. 3# Synthetic magnesia chrome spinel sand material:

[0044] Take MgO: 70; Cr 2 o 3 : 19; SiO 2 : 1.2; Fe 2 o 3 : 6; Al 2 o 3 : 3; CaO: 0.8;

[0045] d. Magnesia material:

[0046] Take MgO: 98; SiO 2 : 0.9; CaO: 0.9; Fe 2 o 3 : 0.2;

[0047] e. Chromium concentrate materials:

[0048] Take Cr 2 o 3 : 50; MgO: 15; SiO 2 : 1.5; CaO: 0.5; Fe 2 o 3 : 25...

Embodiment 2

[0065] The magnesia-chrome composite spinel brick of the present invention is prepared from materials magnesia-chrome spinel sand, magnesia, chrome concentrate and chromium oxide according to the following steps:

[0066] The first step is to select the material by weight percentage as:

[0067] a. 1# Synthetic magnesia chrome spinel sand material:

[0068] Take MgO: 70; Cr 2 o 3 : 20; SiO 2 : 1.2; Fe 2 o 3 : 4;AL 2 o 3 : 4; CaO: 0.8;

[0069] b. 2# Synthetic magnesia chrome spinel sand material:

[0070] Take MgO: 60; Cr 2 o 3 : 30; SiO 2 : 1.2; Fe 2 o 3 : 4;AL 2 o 3 : 4; CaO: 0.8;

[0071] c. 3# Synthetic magnesia chrome spinel sand material:

[0072] Take MgO: 75; Cr 2 o 3 : 14; SiO 2 : 1; Fe 2 o 3 : 4.5; AL 2 o 3 : 4; CaO: 1.5;

[0073] d. Magnesia material:

[0074] Take MgO: 97; SiO 2 : 1.3; CaO: 1.3; Fe 2 o 3 : 0.4;

[0075] e. Chromium concentrate materials:

[0076] Take Cr 2 o 3 : 60; MgO: 9; SiO 2 : 0.3; CaO: 0.7; Fe 2 o 3 : 15; ...

Embodiment 3

[0093] The magnesia-chrome composite spinel brick of the present invention is prepared from materials magnesia-chrome spinel sand, magnesia, chrome concentrate and chromium oxide according to the following steps:

[0094] The first step is to select the material by weight percentage as:

[0095] a. 1# Synthetic magnesia chrome spinel sand material:

[0096] Take MgO: 68; Cr 2 o 3 : 23; SiO 2 : 0.5; Fe 2 o 3 : 5; Al 2 o 3 : 3; CaO: 0.5;

[0097] b. 2# Synthetic magnesia chrome spinel sand material:

[0098] Take MgO: 58; Cr 2 o 3 : 33; SiO 2 : 0.5; Fe 2 o 3 :5;AL 2 o 3 : 3; CaO: 0.5;

[0099] c. 3# Synthetic magnesia chrome spinel sand material:

[0100] Take MgO: 72.5; Cr 2 o 3 : 16.5; SiO 2 : 0.8; Fe 2 o 3 :7;AL 2 o 3 : 2; CaO: 1.2;

[0101] d. Magnesia material:

[0102] Take MgO: 98.5; SiO 2 : 0.5; CaO: 0.5; Fe 2 o 3 : 0.5;

[0103] e. Chromium concentrate materials:

[0104] Take Cr 2 o 3 : 55; MgO: 12; SiO 2 : 1.0; CaO: 1.0; Fe 2 o 3 : ...

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Abstract

The invention discloses a magnesium-chromium composite spinel brick, which is made from synthetic magnesium-chromium spinel sand, magnesia, chrome concentrate and chromium oxide according to the following weight percentage: 1# synthetic magnesium-chromium spinel sand material : Take MgO: 65-70; Cr2O3: 20-25; SiO2: 0.5-1.2; Fe2O3: 4-6; Al2O3: 2-4; CaO: 0.5-1.2; MgO: 55-60; Cr2O3: 30-35; SiO2: 0.5-1.2; Fe2O3: 4-6; Al2O3: 2-4; CaO: 0.5-1.2; 70-75; Cr2O3: 14-19; SiO2: 0.8-1.2; Fe2O3: 4.5-7; Al2O3: 2-4; CaO: 0.8-1.5; ; CaO: 0.5-1.3; Fe2O3: 0.2-0.5; Chromium concentrate: Cr2O3: 50-60; MgO: 9-15; SiO2: 0.3-1.5; : 8-15; chromium oxide material: take Cr2O3: 92-96; ZrO: 4-8. The invention has the advantages of compact structure, thermal shock resistance, spalling resistance, corrosion resistance and the like.

Description

technical field [0001] The invention relates to refractory bricks for industrial kilns, in particular to magnesia-chromium composite spinel bricks for industrial kilns such as RH furnaces, AOD furnaces, and VOD furnaces. Background technique [0002] The refractory bricks used in industrial kilns such as RH furnaces, AOD furnaces, and VOD furnaces outside the furnace are required to have a compact structure and have good thermal shock resistance, corrosion resistance, and peeling resistance. my country has been relying on imports for a long time, which directly leads to the increase of production costs. Contents of the invention [0003] The purpose of the present invention is to provide a high-density, magnesia-chromium composite spinel brick with good spalling resistance. [0004] To achieve the above object, the present invention can take the following technical solutions: [0005] The magnesia-chromium composite spinel brick of the present invention is prepared by syn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/44C04B35/622
Inventor 王慧洲郑化轸慕松林王建营郑宏伟黄昕王新超郑藏李伟宋福龙李爱功周玉新
Owner ZHENGZHOU HUAWEI REFRACTORIES
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