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A kind of method for preparing metallic aluminum by vacuum distillation of bauxite

A technology of bauxite and metal aluminum, applied in the field of vacuum distillation of bauxite to prepare metal aluminum, which can solve the problems of complex electrolysis process, environmental impact, and discharge of perfluorocarbons

Active Publication Date: 2020-03-10
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the electrolysis method has disadvantages such as complex process flow, high energy consumption, and emission of greenhouse gases and perfluorocarbons, which have a very serious impact on the environment.

Method used

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  • A kind of method for preparing metallic aluminum by vacuum distillation of bauxite

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Step 1, with bauxite and carbon powder according to molar ratio (n (O) +n (Si) ):n (C) =1:1.3 carries out proportioning, adds the water that quality is bauxite and carbon powder gross mass 1 / 8, mixes evenly, carries out tabletting under the pressure of 5MPa;

[0056] Step 2. Put the material in step 1 into a graphite crucible, cover the condenser on the top of the crucible, close the vacuum furnace, cover the condenser, draw a vacuum to control the pressure at 10Pa, then heat the material to 1300°C and keep it warm for 80 minutes , to volatilize part of the iron and all the silicon in the material.

[0057] Step 3. When the temperature of the remaining product (excess iron and aluminum compound) in step 2 is raised to 1700° C., nitrogen gas is introduced to control the pressure at 100 Pa and the temperature is maintained for 60 minutes to obtain FeN and AlN products.

[0058] Step 4. When the product of step 3 is cooled to room temperature, the Fe-containing compound...

Embodiment 2

[0062] Step 1, with bauxite and carbon powder according to molar ratio (n (O) +n (Si) ):n (C) =1:1.2 carries out proportioning, adds the water that quality is bauxite and carbon powder gross mass 1 / 10, mixes evenly, carries out tabletting under the pressure of 7MPa;

[0063] Step 2. Put the material in step 1 into a graphite crucible, cover the condenser on the top of the crucible, close the vacuum furnace, cover the condenser, draw a vacuum to control the pressure at 20Pa, then heat the material to 1400°C and keep it warm for 180 minutes , to volatilize part of the iron and all the silicon in the material.

[0064] Step 3. When the temperature of the remaining product (excess iron and aluminum compound) in step 2 is raised to 1500° C., nitrogen gas is introduced to control the pressure at 400 Pa and the temperature is maintained for 160 minutes to obtain FeN and AlN products.

[0065] Step 4. When the product of step 3 is cooled to room temperature, the Fe-containing compo...

Embodiment 3

[0069] Step 1, with bauxite and carbon powder according to molar ratio (n (O) +n (Si) ):n (C) =1:1.1 carries out proportioning, adds the water that quality is bauxite and carbon powder gross mass 1 / 9, mixes evenly, carries out tabletting under the pressure of 10MPa;

[0070] Step 2. Put the material in step 1 into a graphite crucible, cover the condenser on the top of the crucible, close the vacuum furnace, cover the condenser, draw a vacuum to control the pressure at 50Pa, then heat the material to 1200°C and keep it warm for 60 minutes , to volatilize part of the iron and all the silicon in the material.

[0071] Step 3. When the temperature of the remaining product (excess iron and aluminum compound) in step 2 is raised to 1500° C., nitrogen gas is introduced to control the pressure at 500 Pa and the temperature is maintained for 160 minutes to obtain FeN and AlN products.

[0072] Step 4. When the product of step 3 is cooled to room temperature, the Fe-containing compou...

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Abstract

The invention provides a method for preparing metal aluminum through bauxite vacuum distillation, and belongs to the field of vacuum metallurgy. First carbon thermal reduction is carried out under thevacuum condition, and all of Si and part of Fe in a press blank are volatilized; then second carbon thermal reduction is carried out in nitrogen, and a FeN and AlN mixture is obtained; and the metalaluminum is obtained through magnetic separation, decarbonization and vacuum thermal decomposition. By means of the method, the metal aluminum can be directly prepared from bauxite; and the preparation method has the advantages that energy consumption is low, pollution is avoided, the product conversion rate is high, few aluminum by-products are generated, and the purity of prepared aluminum is high. Data show that the purity of the metal aluminum obtained through the preparation method is 95% or above, and the conversion rate is 94% or above.

Description

technical field [0001] The invention relates to the technical field of vacuum metallurgy, in particular to a method for preparing metal aluminum by vacuum distillation of bauxite. Background technique [0002] Aluminum is a light metal with a silver-white metallic luster. Its main characteristics are light weight, corrosion resistance, easy conductivity, easy extension, and beautiful appearance. Its relative density is only 1 / 3 of that of steel, and the mechanical strength ratio of some alloys is even higher. over structural steel. Therefore, aluminum alloys have a large strength ratio. It is widely used in transportation, packaging, construction, electrical, aerospace and military fields, and is the second largest metal material in demand after steel. [0003] my country has a long history of using aluminum ore, and alum has been extracted from alunite for medical and industrial applications very early. Metal aluminum was originally produced by chemical method. Since 195...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B21/02C22B5/10
CPCY02P10/20
Inventor 陈秀敏韩晨琛胥有利周志强杨斌徐宝强蒋文龙郁青春刘大春马文会戴永年邓勇熊恒吴鉴王飞田阳杨佳曲涛
Owner KUNMING UNIV OF SCI & TECH