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Vacuum carbon heat reduction aluminium smelting method

A carbothermal and vacuum technology, applied in the field of vacuum metallurgy, can solve problems such as unrealized industrial application, and achieve the effects of low pollution, high recovery rate and simple process

Inactive Publication Date: 2006-03-29
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are patent reports on extracting metal aluminum from bauxite by using low-priced compounds in foreign countries. These low-priced compounds include low-priced sulfides, low-priced chlorides, and low-priced fluorides. This method has not yet achieved industrial application, so it is valuable to continue to study it

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  • Vacuum carbon heat reduction aluminium smelting method
  • Vacuum carbon heat reduction aluminium smelting method
  • Vacuum carbon heat reduction aluminium smelting method

Examples

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Effect test

Embodiment 1

[0030] Using 1.5kg of industrial alumina as raw material, the specific composition is shown in Table 1, using 0.6kg of coal as the reducing agent and 2.3kg of aluminum trichloride as the chlorinating agent, respectively grinding the alumina and coal into fine powders of 100±20 mesh, Mix evenly and make spherical particles with a diameter of less than 0.1-0.5mm. Put the material particles in a sintering furnace and sinter at a temperature of 300±50°C for 30 minutes. Take out the particles and put them in a vacuum furnace. The pressure in the vacuum furnace is 5-40Pa. When the temperature reaches 1300°C, the measured aluminum trichloride in the sublimator will let the aluminum trichloride escape in gaseous state and enter the reaction zone containing alumina and coal. The three reacted for 100 minutes to obtain AlCl gas, which entered the condensation pan under the condition of vacuuming the top of the vacuum furnace, and was condensed. When the temperature of the gas was cooled ...

Embodiment 2

[0034] Using 2kg of bauxite as raw material, the specific composition is shown in Table 3, using 0.9kg of charcoal as the reducing agent, and 3.kg of aluminum trichloride as the chlorinating agent, respectively grinding alumina and charcoal into fine powders of 100±20 mesh, Mix evenly and make spherical particles with a diameter of less than 0.1-0.5mm. Put the material particles in a sintering furnace and sinter at a temperature of 300±50°C for 35 minutes. Take out the particles and put them in a vacuum furnace. The pressure in the vacuum furnace is 50-100Pa, and the temperature is raised. When the temperature reaches 1500°C, the gas of aluminum trichloride is passed into the reaction zone, and the three react for 120 minutes to obtain AlCl gas, which enters the condensation tray and is condensed. The temperature of the gas is cooled below 900°C, and it condenses and decomposes into metallic aluminum and gaseous aluminum trichloride. Condensate down in the condensing pan, obta...

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Abstract

A process for refining Al from alumina ore by vacuum carbothermic reduction method includes such steps as loading alumina ore, reducing agent and chlorinating agent in internally heated vacuum furnace, reaction at 1270-1570 deg.C under 5-400 Pa for 100-120 min to obtain AlCl, and lowering the temp to lower than 900 deg.C to obtain metallic Al with high purity (more than 95%) and AlCl3 with more than 78% in recovery rate.

Description

[0001] 1. Technical field: vacuum metallurgy. 2. Background technology: [0002] The production of aluminum has a history of more than 100 years. The main production method is the electrolysis of cryolite molten salt to obtain metal aluminum from alumina. After more than 100 years of hard work, people have made progress in the production of alumina and the production process of electrolytic aluminum Many improvements have been made, but so far there are still many problems in the entire aluminum production process, such as: large pollution, high energy consumption, large investment, high production cost of raw material alumina, etc. 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 decomposition of low-priced compounds. [0003] Regarding the low-valent halide decomposition method to directly extract metal aluminum from alumina and alumina-containing minerals, its ...

Claims

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Application Information

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IPC IPC(8): C22B21/02C22B5/10
Inventor 戴永年王平艳杨斌李秋霞吴国元杨部正刘永成马文会刘大春吴昆华徐宝强周晓奎李伟宏姚耀春杨骏
Owner KUNMING UNIV OF SCI & TECH
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