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Method for low-temperature electrolysis of aluminum oxide for producing aluminum adopting ion liquid

A technology of electrolytic alumina and ionic liquid, which is applied to the improvement of process efficiency, photographic technology, instruments, etc., can solve the problems of high cost, high electrolysis temperature, and large energy consumption, and achieve stable properties, high conductivity, and electrochemical The effect of window width

Inactive Publication Date: 2008-09-17
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects of high electrolysis temperature, high energy consumption, high cost, and environmental pollution in the current electrolytic aluminum industry, and provide a method for producing aluminum by direct low-temperature electrolysis of alumina using ionic liquid, which has simple process flow, high electrolysis temperature Low, no fluoride emissions, low production costs, can be used in the method of industrial electrolytic aluminum

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Using N-methylimidazole and C 2 h 5 For Br reaction, the two raw materials were mixed according to the molar ratio of 1:1, and stirred at 50°C for 24h to obtain [emim]Br. Then add solid sodium bisulfate in an equimolar ratio (based on the amount of N-methylimidazole) and a certain amount of acetone, and stir for 24 hours. The obtained ionic liquid was filtered with a sand core funnel, and the filtrate was filtered with CH 2 Cl 2 Extraction, then vacuum distillation and vacuum drying to remove CH in the filtrate 2 Cl 2 And acetone, obtain product ionic liquid [emim] HSO 4 .

[0023] The obtained ionic liquid is mixed evenly with industrial alumina, and direct current electrolysis is adopted. Use high-purity solid carbon as the anode and cathode. The anode and cathode of the electrolytic cell are perpendicular to the cell surface, the distance between them is 3.2cm, the cell voltage is 2.0V, and the anode current density is 0.65A / cm 2 , Electrolysis temperature 1...

Embodiment 2

[0025] Using N-methylimidazole and C 4 h 9 Br was mixed and reacted according to the molar ratio of 1:1.2, and [bmim]Br was obtained by reacting and stirring at 50°C for 48h. Then add solid sodium bisulfate and a certain amount of acetone at a molar ratio of 1:1.2 (based on the amount of N-methylimidazole) and stir at 50° C. for 12 hours. The obtained ionic liquid was filtered with a sand core funnel, and the filtrate was filtered with CH 2 Cl 2 extraction. Then, the CH in the filtrate was removed by vacuum distillation and vacuum drying. 2 Cl 2 And acetone, obtain product ionic liquid [bmim] HSO 4 .

[0026] Mix the ionic liquid and industrial alumina evenly, and conduct DC electrolysis. Use high-purity solid carbon as the anode and cathode. The anode and cathode of the electrolytic cell are perpendicular to the cell surface, the distance between them is 3cm, the cell voltage is 2.1V, and the anode current density is 0.70A / cm 2 , The electrolysis temperature is 120°...

Embodiment 3

[0028] Using N-methylimidazole and C 4 h 9 Cl was mixed and reacted according to the molar ratio of 1:1.3, and the obtained [bmim]Cl was stirred at 50°C for 24 hours. Then add solid sodium bisulfate and a certain amount of acetone at a molar ratio of 1:1.3 (based on the amount of N-methylimidazole) to it, and stir at 50° C. for 24 hours. The obtained ionic liquid was filtered with a sand core funnel, and the filtrate was filtered with CH 2 Cl 2 extraction. Then, the CH in the filtrate was removed by vacuum distillation and vacuum drying. 2 Cl 2 And acetone, obtain product ionic liquid [bmim] HSO 4 .

[0029] Mix the ionic liquid and industrial alumina evenly, and conduct DC electrolysis. Use high-purity solid carbon as the anode and cathode. The anode and cathode of the electrolytic cell are perpendicular to the cell surface, the distance between them is 3.5cm, the cell voltage is 2.2V, and the anode current density is 0.68A / cm 2 , The electrolysis temperature is 130...

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Abstract

The invention relates to a method for producing aluminum by adopting ionic liquid to directly electrolyze alumina at a low temperature, and is characterized in that the HSO4<-> type anionic ionic liquid dissolves alumina and is taken as a low temperature electrolyte, alumina is taken as raw material and is directly electrolyzed by the direct current, the tank voltage is higher than the decomposition voltage of alumina but lower than that of the electrochemical window of the ionic liquid, aluminum is separated out from the cathode, and CO2 is generated from the anode. The ionic liquid adopted by the invention has wide source, low price, good stability, high conductivity, and wide electrochemical window; the good stability is environmental friendly and can efficiently dissolve alumina at a low temperature; adopting the ionic liquid as the low temperature electrolyte greatly reduces the temperature of electrolysis and the tank voltage; the capacity usage ratio is high and the erosion of equipment is greatly reduced.

Description

Technical field: [0001] The invention belongs to the field of metal smelting, and specifically relates to a method for producing aluminum by using ionic liquid low-temperature electrolytic alumina. Background technique: [0002] The aluminum industry is the largest electrochemical industry in the world, and its output is second only to steel. Because of its light weight, good thermal and electrical conductivity, machinability and alloy composition, a large amount of aluminum is used in construction and structural materials, transportation devices, beverage cans, packaging materials, power transmission lines, daily necessities, machinery equipment etc. [0003] The modern aluminum industry mainly uses the Hall-Héroult method to produce aluminum, that is, the cryolite-alumina molten salt electrolysis method. In this method, alumina is used as raw material, molten cryolite is used as electrolyte, direct current is passed into the electrolytic cell, and electrochemical reactio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/02
CPCY02P10/20
Inventor 李会泉马江华李玉平张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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