A composite electro-fusing refractory material and method for preparing the same

A technology of refractory material and production method, applied in the field of production of electrofused composite refractory material, can solve the problems of unfavorable reduction reaction, reduction of metal aluminum and high content, and achieve the effects of reducing environmental pollution, reducing power consumption and low carbon content

Inactive Publication Date: 2006-10-11
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are limitations in this method at present: (1) Al in the aluminum ash is required 2 o 3 (2) A large amount of metal aluminum in the washed aluminum ash is hydrated, resulting in the reduction of metal aluminum, which is not conduciv

Method used

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Comparison scheme
Effect test

Embodiment 1

[0019] The invention discloses a production method of electrofusion composite refractory material. According to the weight percentage, 20-40% aluminum ash is mixed with 60-80% super-grade bauxite clinker fine powder and pressed into a billet. It is smelted in an electric arc furnace under the condition of 2000-2600 DEG C, taken out after cooling, and then crushed and separated to obtain an electrofusion composite refractory material. The chemical composition of aluminum ash is: Al 2 O 3 24.62%, Al 29.6%, MgO 10.7%, SiO 2 10.5%, Na 2 O is 3.7%, CaO is 2.4%, TiO 2 2.0%, Fe 2 O 3 2.2%, 12.84% for burning, and 1.5% for others.

[0020] According to X-ray diffraction analysis, the main phase is corundum, with a small amount of magnesium aluminum spinel. The result of chemical analysis is: Al 2 O 3 It is 96.4%, MgO is 2.48%, and C is 0.02%. The bulk density is 3.80g / cm 3 , the apparent porosity is 3.5%.

Embodiment 2

[0022] A production method of electrofusion composite refractory material. According to the weight percentage, 70-90% of aluminum ash and 10-30% of light-burned magnesia powder are mixed, pressed into a billet, and heated in an induction furnace at 1800-2100 DEG C. It is smelted in the middle, taken out after cooling, then crushed and separated to obtain an electrofusion composite refractory material. The chemical composition of aluminum ash is: Al 2 O 3 24.62%, Al 29.6%, MgO 10.7%, SiO 2 10.5%, Na 2 O is 3.7%, CaO is 2.4%, TiO 2 2.0%, Fe 2 O 3 2.2%, 12.84% for burning, and 1.5% for others.

[0023] According to X-ray diffraction analysis, the main phase is magnesium aluminum spinel, and a small amount of Sialon phase exists. The result of chemical analysis is: Al 2 O 3 It is 74.5%, MgO is 21.6%, and C is 0.03%. The bulk density is 3.24g / cm 3 , the apparent porosity is 4.1%.

Embodiment 3

[0025] A method for producing an electrofusion composite refractory material. According to the weight percentage, 60-80% of aluminum ash and 20-40% of magnesite powder are mixed, pressed into a billet, and placed in an electric arc furnace under the condition of 2000-2700 DEG C. Smelting, taking out after cooling, then crushing and separating to obtain electrofusion composite refractory material. The chemical composition of aluminum ash is: Al 2 O 3 24.62%, A 29.6%, MgO 10.7%, SiO 2 10.5%, Na 2 O is 3.7%, CaO is 2.4%, TiO 2 2.0%, Fe 2 O 3 2.2%, 12.84% for burning, and 1.5% for others.

[0026] By X-ray diffraction analysis, the main phase is magnesium aluminum spinel. The result of chemical analysis is: Al 2 O 3 It is 76.2%, MgO is 22.3%, and C is 0.04%. The bulk density is 3.18g / cm 3 , the apparent porosity is 5.2%

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Abstract

The invention refers to a production method of electrocast refractories composite. The technical project is mixing 20-90 % aluminium ash and alumina or 10-80% magnesium-containing compound according to weight percent, pressing to compact, electric smelting in 1800-3000deg C, taking off after chilled, and then bruising, separating and the getted electrocast refractories composite is electro-melting corundum or electro-melting magnesium aluminate spinel compound. Thereinto: the percentage content of main component in chemical aluminium ash is Al2O3 10-70%, Al 10-40%, MgO 0.3-20%, SiO2 0.5-30%;Magnesium-containing compound is one or two kind of magnesium carbonate and magnesia. This invention using non-oxidized substance such as metal alumina, aluminium nitride and so on of aluminium ash as main reductor, fuse deacidizing oxidate such as SiO2,Fe2O3,TiO2 and so on in alumina or aluminium ash, so electrical energy consumption is low and environmental contamination is light; The prepared electro-melting corundum or magnesium aluminate spinel compoud has the character of low carbin containing.

Description

1. Technical field [0001] The invention belongs to the technical field of composite refractory material production. In particular, it relates to a production method of an electrofusion composite refractory material. 2. Background technology [0002] In the production process of electrolytic aluminum, aluminum materials, and aluminum products, a large amount of waste residues will be generated. Usually, after recycling some of the metal aluminum, the remaining residues are discarded as garbage. These wastes are called aluminum slag or aluminum ash, also known as Aluminium slag ash. The chemical composition of aluminum ash is mainly Al 2 O 3 , SiO 2 , MgO, Fe 2 O 3 , Na 2 O, CaO and metal aluminum are the main ones, as well as some nitrides, chlorides and sulfides. General SiO 2 At 5~20%, Al 2 O 3 At 40-75%, the proportion of its chemical composition varies slightly with the raw materials and operating conditions of each manufacturer. [0003] Aluminum ash is a kin...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/10
Inventor 李远兵李亚伟李楠赵雷雷中兴金胜利洪学勤
Owner WUHAN UNIV OF SCI & TECH
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