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Aluminium electrolyzing process

A technology of aluminum electrolysis and electrolyte, which is applied in the field of aluminum electrolysis, can solve problems affecting the stability of electrolytic production and technical and economic indicators, and the difficulty of forming furnace sides, etc., and achieve the effects of improving technical and economic indicators, reducing power consumption, and increasing current efficiency

Inactive Publication Date: 2007-06-06
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
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Problems solved by technology

Moreover, the bottom of the electrolytic production furnace with low molecular ratio is easy to form precipitated crusts, and the furnace side is not easy to form, which affects the stability and technical and economic indicators of electrolytic production.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] In the electrolyte of aluminum electrolysis, LiF with a molecular ratio of 2.3, 2% of the total weight of the electrolyte and 4% of CaF 2 , Al 2 o 3 The optimized electrolyte composition is 1.5%-3.0%, the aluminum level in the electrolysis process is 18-25cm, the cell voltage is 4.0-4.2V, and the effect coefficient is <0.15 times / cell day. The primary crystallization temperature of the electrolysis is 920°C, the degree of superheat is 5-12°C, and the electrolysis temperature is 925-932°C. The new technology of phase unity and three-low optimization has been realized. The bottom of the furnace does not form precipitated crusts, and the sides of the furnace are not easy to melt. The electrolysis runs smoothly, the current efficiency is high, the DC power consumption is low, the anode consumption and fluoride salt consumption are low, and the anode effect coefficient is low.

Embodiment 2

[0014] In the electrolyte of aluminum electrolysis, LiF with a molecular ratio of 2.3, 4% of the total weight of the electrolyte and 2% of CaF 2 , combined with 1.5% ~ 3.0% Al 2 o 3 The optimized electrolyte composition, the aluminum level in the electrolysis process is 18-25cm, the cell voltage is 4.0-4.2V, and the effect coefficient is <0.15 times / cell day. The primary crystal temperature is 910°C, the degree of superheat is 5-10°C, and the electrolysis temperature is 920-930°C. There is no precipitation crust at the bottom of the furnace, and the sides of the furnace are not easy to melt. The electrolysis runs smoothly, the current efficiency is high, and the DC power consumption is low. Low anode consumption and fluoride salt consumption, low anode effect coefficient.

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Abstract

The aluminum electrolyzing process with alumina as material to produce aluminum features the electrolyte comprising LiF 2-5 wt%, CaF2 2-5 wt%, Al2O3 1.5-3.0 wt%, and cryolite with NaF / AlF3 molar ratio not higher than 2.3 for the rest. The process has initial crystallizing temperature of the electrolyte not higher than 920 deg.c, superheating degree of 5-12 deg.c, and electrolysis temperature no higher than 935 deg.c. The present invention has no encrusting and melting-off of the electrolytic furnace, high current efficiency, low power consumption and improved economic and technological indexes.

Description

technical field [0001] An aluminum electrolysis method relates to a method for producing aluminum by electrolysis using alumina as a raw material. [0002] Aluminum electrolysis Background technique [0003] In the aluminum electrolysis production process, reducing the electrolysis temperature can reduce heat loss. Experimental studies have shown that reducing the electrolysis temperature by 10°C can increase the current efficiency by about 1% and reduce power consumption by 220kwh / t.Al. With the molecular ratio NaF / AlF 3 As the molar ratio decreases, the melting point of the electrolyte decreases, but the dissolution rate of alumina decreases. Among various additives, LiF can significantly reduce the initial crystallization temperature of the electrolyte, and can increase the conductivity and reduce the vapor pressure of the electrolyte. However, due to the high price of lithium salts, the industrial application is limited. [0004] At present, most industrial aluminum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/18
Inventor 王熙慧吴举吴红应李希明王会全成庚吕増旭代启安荆文军牛师温方斌李遂成韦鼎军
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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