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Charging method for aluminum electrolysis cell during roasting start

A technology for starting roasting and an aluminum electrolytic cell, which is applied to the field of furnace loading during the roasting start of an aluminum electrolytic cell, and can solve the problems of uneven roasting temperature, concentration of cathode thermal stress, affecting roasting effect, etc.

Inactive Publication Date: 2012-12-05
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0004] During the firing start-up process of the aluminum electrolytic cell, due to the different distribution of the cathode resistance of the electrolytic cell, the firing temperature will be uneven, and the thermal stress concentration of the cathode will occur, which will affect the firing effect.

Method used

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Examples

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Embodiment

[0028] The requirements for laying coke grains before starting the roasting of 300KA electrolyzer in a certain factory.

[0029] 1. When laying coke particles, it is laid continuously from the flue end to the aluminum outlet end, and the A and B sides are alternately carried out.

[0030] 2. There are 40 sets of anodes in the 300KA electrolytic cell, among which the A1-A4, A17-A20 and B8-B12 positions are jointly laid by A and B coke particles. The specific method is: first weigh 5±1kg of coke particles B, spread them evenly in the laying screen, scrape them flat with a scraper ruler, make the coke particles fall slowly until each hole is filled, and spread to 50 of the length of the anode. When ~70%, use coke grain A instead, spread it evenly in the laying screen, and scrape it with a scraper until the entire anode projection screen is covered; all other positions are laid with A coke grain.

[0031] 3. The particle size composition of A coke grains is 1--2mm, accounting for...

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Abstract

The invention discloses a charging method for an aluminum electrolysis cell during roasting start, and relates to improvement on an aluminum electrolysis cell charging roasting start method in an aluminum electrolysis production process. A scorched particle roasting method is adopted in the roasting start process. The method is characterized in that calcined scorched particles with high and low resistance rates are charged in the charging process. The charging method for the aluminum electrolysis cell during roasting start is applied to charging operation; and after a conductive medium is selected and laid, in the roasting process, the roasting temperature of a cathode is distributed uniformly, thermal stress of the cathode is reasonably absorbed, and thermal stress concentration is avoided.

Description

technical field [0001] The invention relates to a furnace loading method for the firing start of an aluminum electrolytic cell, and relates to an improvement of a furnace charging firing start method for the electrolytic cell during the production process of aluminum electrolysis. Background technique [0002] Aluminum electrolytic cell is the main equipment for aluminum smelting. Since the cryolite-alumina molten salt electrolysis method was invented, it has a history of more than 100 years. Baking tank, such as special-shaped cathode, new structure, double steel rod, steel rod magnetic shielding electrolyzer, etc. Significant progress has been made in the technical level of aluminum electrolysis, automation equipment, and refined management. [0003] Generally, there are three methods for starting the roasting of the electrolytic cell: the first is the molten aluminum roasting method; the second is the coke particle roasting method; the third is the gas roasting method. ...

Claims

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Application Information

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IPC IPC(8): C25C3/06
Inventor 胡清韬史志荣焦庆国杨文杰
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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