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Method for extracting metallic aluminium from aluminum oxide by vacuum carbothermal reduction

A technology for extracting metal and alumina, which is applied in the field of vacuum metallurgy, can solve the problems of low reaction degree, unrealized industrial application, low direct recovery rate of metal aluminum, etc., and achieve the effect of high metal purity

Inactive Publication Date: 2010-03-03
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
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Problems solved by technology

At present, literatures at home and abroad have reported various low-priced aluminum chloride gas (AlCl) decomposition methods to refine aluminum from alumina-containing ores. , the method has not yet achieved industrial application

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Using 13.6g of industrial alumina as raw material, the specific composition is shown in Table 1, using 3.4g of graphite as the carbonaceous reducing agent, and 18.0g of anhydrous aluminum trichloride as the chlorinating agent, mixing alumina and graphite evenly, at 2MPa After granulation under pressure, it is placed in the reaction crucible of the vacuum furnace and the top of the vacuum furnace is sealed. Put the anhydrous aluminum trichloride weighed according to the measurement into the sublimation crucible, place the sublimation crucible in the anhydrous aluminum trichloride sublimation device of the vacuum furnace, and seal the bottom of the vacuum furnace. Turn on the vacuum system and control the system pressure to 50Pa. When the temperature reaches 1530°C, heat the anhydrous aluminum trichloride biochemical device after 60 minutes of heat preservation, and the anhydrous aluminum trichloride will be sublimated into gaseous aluminum trichloride, and Enter the high...

Embodiment 2

[0025] Using 14.3g of industrial alumina as the raw material, the specific composition is the same as in Table 1, using 4.3g of graphite as the carbonaceous reducing agent, and 28.0g of anhydrous aluminum trichloride as the chlorinating agent. After pressing into a block under pressure, it is placed in the reaction crucible of a vacuum furnace, and the top of the vacuum furnace is sealed. Put the anhydrous aluminum trichloride weighed according to the measurement into the sublimation crucible, place the sublimation crucible in the anhydrous aluminum trichloride sublimation device of the vacuum furnace, and seal the bottom of the vacuum furnace. Turn on the vacuum system and control the system pressure to 30Pa. When the temperature reaches 1430°C, heat the anhydrous aluminum trichloride biochemical device after 75 minutes of heat preservation, and the anhydrous aluminum trichloride will be sublimated into gaseous aluminum trichloride, and Enter the high-temperature reaction cru...

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Abstract

The invention provides a method for extracting metallic aluminium from aluminum oxide by vacuum carbothermal reduction, which comprises the following steps: adopting aluminium oxide or minerals containing aluminium oxide as raw material, auxiliarily taking graphite as reducing agent and aluminium trichloride as chlorinating agent, carrying out carbothermal reaction in a vacuum furnace under the condition that the system pressure is 20Pa, the reducing temperature is 1400-1600 DEG C and the reaction time is 60-90min, then carrying out chlorination to carbothermal residue for 30-60min and finallyobtaining aluminum subchloride (AlCl), when temperature lowers, disproportioning and decomposing AlCl into metallic aluminium and aluminium trichloride at the temperature less than 660 DEG C, and obtaining metallic aluminium with purity more than 95% and recovery efficiency reaching more than 80%. The recovery efficiency of aluminium trichloride is more than 80%; and the process flows are short,the cost is low and the pollution to environment is small.

Description

1. Technical field: [0001] The invention relates to a method for extracting metal aluminum from alumina by vacuum carbothermal reduction, which belongs to the technical field of vacuum metallurgy. 2. Background technology: [0002] The industrial production of aluminum mainly uses cryolite and alumina molten salt electrolysis. Although in the past 100 years, people have made many achievements in the production of alumina and electrolytic aluminum, but there are still many problems in the production process of electrolytic aluminum smelting, such as: need alumina, fluoride salt , carbon materials and other expensive raw materials, large investment in equipment, low output per tank, high cost per ton of aluminum, and large greenhouse gas emissions. Therefore, many scientific researchers have been engaged in the research of new methods of non-electrolytic aluminum smelting, one of which is aluminum smelting by disproportionation of low-priced compounds. [0003] The principle...

Claims

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Application Information

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IPC IPC(8): C22B21/02C22B5/10
Inventor 杨斌戴永年袁海滨冯月斌徐宝强郁青春刘大春刘永成周晓奎汪镜福蒋文龙杨骏朱富龙
Owner KUNMING UNIV OF SCI & TECH
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