Method for producing aluminium and aluminium alloy by low temperature electrolysis

An aluminum alloy and low-temperature technology, which is applied in the field of low-temperature electrolysis to produce aluminum and aluminum alloys, can solve the problems of high cost and high electrolysis temperature, and achieve the effects of high power utilization rate, low melting point, and wide source of raw materials

Inactive Publication Date: 2005-09-07
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a method for producing aluminum and aluminum alloys by low-temperature electrolysis in view of the disadvantages of high electrolysis temperature and high cost in the current industrial aluminum electrolysis production of aluminum and aluminum alloys

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The raw material used is aluminum oxide, 80% by weight of aluminum oxide and 20% by weight of petroleum coke are uniformly mixed, and chlorine gas is introduced into a boiling reactor for chlorination. A certain amount of dry air is introduced into the chlorination process, and the chlorination temperature is 900°C, and the AlCl coming out of the reactor 3 The gas, after being filtered and purified, enters the condenser and condenses into AlCl 3 solid.

[0016] Prepare AlCl 3 -EMIC (chloro-1-ethyl-3-methylimidazole) ionic liquid, AlCl 3 The molar ratio to EMIC is 1.5-2:1-0.5. Using the ionic liquid as the electrolyte, direct current electrolysis, using high-purity graphite as the anode, and solid aluminum as the cathode, the cathode and anode of the electrolytic cell are vertically arranged, and the electrode surfaces are parallel to each other. The electrodes arranged in this way can also install multiple sets of electrodes in the same tank, that is, Yang-Yin-Yang-...

Embodiment 2

[0018] The raw material used is coal gangue, the coal gangue with a weight percentage of 80% and the petroleum coke with a weight percentage of 20% are evenly mixed, and chlorine gas is introduced into a boiling reactor for chlorination. A certain amount of dry air is introduced during the chlorination process, and the chlorination temperature is 700°C, and the AlCl coming out of the reactor 3 The gas, after being filtered and purified, enters the condenser and condenses into AlCl 3 solid.

[0019] Prepare AlCl 3 -BPC (chloro-1-butylimididine) ionic liquid, AlCl 3 The molar ratio with BPC is 1~2:1~2. Using the ionic liquid as the electrolyte, direct current electrolysis, using high-purity graphite as the anode, and solid aluminum as the cathode, the cathode and anode of the electrolytic cell are vertically arranged, and the electrode surfaces are parallel to each other. The electrodes arranged in this way can also install multiple groups of electrodes in the same tank, tha...

Embodiment 3

[0021] The used raw material bauxite is uniformly mixed with 80% by weight of bauxite and 20% by weight of activated carbon, and chlorine gas is introduced into a boiling reactor for chlorination. A certain amount of dry air is introduced into the chlorination process, and the chlorination temperature is 800°C, and the AlCl coming out of the reactor 3 The gas, after being filtered and purified, enters the condenser and condenses into AlCl 3 solid.

[0022] Prepare AlCl 3 -[bmim]BF 4 (1-Ethyl-3-methylimidazolium tetrafluoroborate) Ionic Liquid, AlCl 3 with [bmim] BF 4 The molar ratio of is 1~1.5:1~1.5. Using the ionic liquid as the electrolyte, direct current electrolysis, using high-purity graphite as the anode, and solid aluminum as the cathode, the cathode and anode of the electrolytic cell are vertically arranged, and the electrode surfaces are parallel to each other. The electrodes arranged in this way can also install multiple sets of electrodes in the same tank, th...

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Abstract

The invention relates to a method of making aluminum and aluminum alloy through electrolyzing in low temperature, which belongs to the metal material field, characterized in that it uses the alumina or silicate mineral containing aluminum as raw materials, and gets anhydrous aluminum chloride after chloridization, then prepares AlCl3 ionic liquid with anhydrous aluminum chloride, and uses the AlCl3 ionic liquid as ionogen, the aluminum will be produced in the cathode while the chlorine will be discharged from the anode. When producing the aluminum alloy, preparing the alloy elements chloridate-AlCl3 ionic liquid through adding alloy elements chloridate MeCln to the AlCl3 ionic liquid, Using the direct current to electrolyzing, wherein the voltage is above the higher decomposition voltage of the aluminium chloride and chloridate and below the electrochemistry window of the ionic liquid, and the aluminum will be produced in the cathode while the chlorine will be discharged from the anode.

Description

technical field [0001] The invention belongs to the field of metal materials, in particular to a method for producing aluminum and aluminum alloys by low-temperature electrolysis. Background technique [0002] The modern aluminum industry mainly uses the Hall-Héroult method to produce aluminum, that is, the cryolite-alumina electrolysis method. Direct current is passed into the electrolytic cell, and electrochemical reactions occur on the anode and the cathode. The electrolysis product is aluminum liquid on the cathode, and carbon material is used for the anode, and CO is generated on the anode. 2 and CO gas. The capacity of modern electrolyzer has reached 500kA, the current efficiency is 93-96%, and the DC power consumption is 12200-13500kWh / t aluminum. However, the Hall-Héroult method still has many shortcomings, mainly as follows: low single-tank productivity; low energy utilization rate, less than 50%; high electrolysis temperature, as high as 920-950 ° C; consumption ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/02
CPCY02P10/20
Inventor 卢惠民
Owner UNIV OF SCI & TECH BEIJING
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