Method for preparing aluminium and aluminium alloy by low temperature molten-salt electrolysis

A low-temperature molten salt and aluminum alloy technology is applied in the field of electrolytic aluminum production, which can solve the problems of high electrolysis temperature and large power consumption, and achieve the effect of reducing electrolysis temperature and saving electric energy.

Inactive Publication Date: 2007-03-28
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the electrolysis temperature is high and the power consumption is large.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] 2 kg Al 2 o 3 Press the block under 30MPa pressure, normal pressure, protective atmosphere, sinter at 1000°C for 10 hours (or sinter at 1100°C for 8 hours, or sinter at 1200°C for 6 hours) to make a cathode, and place the cathode at the bottom of the graphite electrolytic cell; NaCl-CaCl 2 Mix 1 kg according to the molar ratio of 1:1, dehydrate to make electrolyte, put it on the upper part of the cathode block; heat it up to 600°C, after the electrolyte melts, insert the graphite anode into the molten salt, 0.3cm away from the alumina cathode, and apply the voltage 3.2V electrolysis, electrolysis to current less than 1.0 amps. Take out the cathode and put it into the smelting furnace, melt it at 660°C and cast it into an ingot. Through chemical analysis, the purity of aluminum in the product is over 99%.

Embodiment 2

[0011] At 2 kg Al 2 o 3 Add 50 grams of metal aluminum particles, briquette under 130MPa pressure, normal pressure, protective atmosphere, sinter at 1000°C for 10 hours (or sinter at 1100°C for 8 hours, or sinter at 1200°C for 6 hours) to make a cathode, put the cathode At the bottom of the graphite electrolyzer; NaCl-CaCl 2 Mix 1 kg according to the molar ratio of 1:1, dehydrate to make electrolyte, put it on the upper part of the cathode block; heat it up to 600°C, after the electrolyte melts, insert the graphite anode into the molten salt, 0.3cm away from the alumina cathode, and apply the voltage 3.2V electrolysis, electrolysis to current less than 1.0 amps. Take out the cathode and put it into the smelting furnace, melt it at 660°C and cast it into an ingot. Through chemical analysis, the purity of aluminum in the product is over 99%.

Embodiment 3

[0013] At 2 kg Al 2 o 3 Add 50 grams of carbon particles, 80MPa pressure briquettes, normal pressure, protective atmosphere, 1000 ℃, 10 hours sintering (or 1100 ℃ sintering 8 hours, or 1200 ℃ sintering 6 hours) to make the cathode, put the cathode on Graphite cell bottom; NaCl-CaCl 2 Mix 1 kg according to the molar ratio of 1:1, dehydrate to make electrolyte, put it on the upper part of the cathode block; heat it up to 600°C, after the electrolyte melts, insert the graphite anode into the molten salt, 0.3cm away from the alumina cathode, and apply the voltage 3.2V electrolysis, electrolysis to current less than 1.0 amps. Take out the cathode and put it into the smelting furnace, melt it at 660°C and cast it into an ingot. Through chemical analysis, the purity of aluminum in the product is over 99%.

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Abstract

The invention relates to a low temperature salt smelting electrolytic preparation aluminum and aluminum alloy that uses metal chloride or metal chloride mixture as electrolyte that has melting point lower than 800 degree centigrade, uses carbon material or noble electrode as anode, puts cathode on the bottom of graphitic cell groove and puts electrolyte on the upper of cathode, electrifying and heating, after electrolyte smelting, inserting the anode into molten salt, taking fusion electrolysis under the conditions of over A1203 decomposition voltage and lower electrolyte decomposition voltage, inter-pole gap over 0.1cm, temperature below 800 degree centigrade, electrolyzing to current lower than 1.0A, taking out cathode into smelter, smelting aluminum and casting under the condition of over 660 degree centigrade; using liquid aluminum and alumina mixture as cathode electrolyzing, and the temperature is over 660 degree centigrade, taking out aluminum from cathode, adding alumina, continuously taking electrolyzing process. The method sharply decreases electrolyzing temperature and saves electric energy.

Description

technical field [0001] The invention relates to the technical field of aluminum production by electrolysis, in particular to a method for preparing aluminum and aluminum alloys by electrolysis of low-temperature molten salt. Background technique [0002] Aluminum is an important metal, its output is second only to iron and steel, and it is the second largest metal material. my country is the largest producer of aluminum. Industrially, metal aluminum is produced by molten salt electrolysis, with alumina as raw material, cryolite as flux and electrolyte, aluminum liquid as cathode, carbon material as anode, electrolysis temperature is 950°C, aluminum is precipitated at the cathode during the electrolysis process, and the anode is Oxygen is released and reacts with carbon to form CO 2 and CO evolution. The disadvantage of this method is that the electrolysis temperature is high and the power consumption is large. Therefore, people have been searching for a method for prepari...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/06
Inventor 翟玉春谢宏伟王伟王锦霞顾惠敏
Owner NORTHEASTERN UNIV
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