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Starting method for aluminum cell

An aluminum electrolytic cell and electrolyte technology, applied in the field of aluminum electrolytic cell start-up, can solve problems such as environmental pollution, soda ash concentration, carbon cathode sodium excess, etc., and achieve the effect of avoiding molecular ratio fluctuations and smooth electrolyte temperature changes

Inactive Publication Date: 2012-05-30
山西华圣铝业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to ensure that the roasting of the new tank can reach a sufficient temperature and establish a regular furnace side with a high melting point after start-up, it is necessary to manually add a large amount of solid soda ash when the electrolytic tank is installed and started, so as to increase the electrolyte molecular ratio to above 2.8; The addition of too much soda ash will easily cause local concentration of soda ash, so that the local absorption of sodium in the carbon cathode is excessive, which will have an adverse effect on the cathode lining of the electrolytic cell; and the addition of soda ash will further increase the loss of cryolite and the labor intensity of workers. safety hazards and environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Taking the 300KA electrolytic cell as an example, after laying the coke grains and hanging the poles during the furnace installation, firstly use cardboard to seal the top and side of the gap between the anode electrodes, and then add 6.3 tons of thick iron to the edge of the bottom palm close to the anode around the tank chamber. 0.9 tons of calcium fluoride is evenly spread on the artificial legs, 0.5 tons of magnesium fluoride is evenly added on the calcium fluoride, and 0.7 tons of soda ash is evenly added close to the anode, and then tightly on the cryolite. Install 2 tons of electrolyte blocks on the side carbon block; add 19 tons of high molecular ratio cryolite, 0.17 tons of calcium fluoride, 0.16 tons of magnesium fluoride, 0.16 tons of soda ash and 2.8 tons of electrolyte blocks after starting.

Embodiment 2

[0015] Taking the 300KA electrolytic cell as an example, after laying the coke grains and hanging the poles during furnace installation, firstly use cardboard to seal the top and side of the gap between the anode electrodes, and then add 5.8 tons of thick iron to the edge of the bottom palm close to the anode around the tank chamber. 1.2 tons of calcium fluoride is evenly spread on the artificial legs, 0.6 tons of magnesium fluoride is evenly added on the calcium fluoride, and 0.8 tons of soda ash is evenly added close to the anode, and then tightly on the cryolite. Install 2 tons of electrolyte blocks on the side carbon block; add 17.4 tons of high molecular ratio cryolite, 0.24 tons of calcium fluoride, 0.2 tons of magnesium fluoride, 0.2 tons of soda ash and 3.2 tons of electrolyte blocks after starting.

Embodiment 3

[0017] Taking the 300KA electrolytic cell as an example, after laying the coke grains and hanging the poles during the furnace installation, firstly use cardboard to seal the top and side of the gap between the anode electrodes, and then add 6 tons thick 1.1 tons of calcium fluoride is evenly spread on the artificial legs, 0.5 tons of magnesium fluoride is evenly added on the calcium fluoride, and 0.8 tons of soda ash is evenly added close to the anode, and then tightly on the cryolite. Install 2T of electrolyte block on the side carbon block; after start-up, add 21 tons of high molecular ratio cryolite, 0.2 tons of calcium fluoride, 0.13 tons of magnesium fluoride, 0.19 tons of soda ash and 3 tons of electrolyte blocks.

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PUM

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Abstract

A starting method for an aluminum electrobath relates to an aluminum electrobath starting process, and is characterized in that in the 300KA eletrobath, after coke particles are paved and the pole is hung, firstly an upper side and a side of an anode interpolar gap are plugged by a paperboard, then high molecular ratio cryolite is added to a bottom metacarpal edge clinging to the anode at the periphery of a cell, calcium fluoride is uniformly paved on an artificial leg, magnesium fluoride is uniformly added on the calcium fluoride, then an electrolyte block is charged on the cryolite abutting a side carbon block; after starting the high molecular ratio cryolite, the calcium fluoride, the magnesium fluoride, soda and the electrolyte block are added too, after roasting, the high molecular ratio cryolite, the calcium fluoride, the magnesium fluoride, the soda and the electrolyte block are added in to electrobath, and then the electrobath is started. The method of the invention adopts the high molecular ratio cryolite and reduces the amount of the soda, so that the molecular ratio is more than 2.8 after the electrobath is started, thereby improving the stability of the technique technology conditions and reducing the working intensity of workers.

Description

technical field [0001] The invention discloses a method for starting an aluminum electrolytic cell, relating to a method for starting an aluminum electrolytic cell, in particular to a method for starting a large aluminum electrolytic cell. Background technique [0002] Cryolite-alumina molten salt electrolysis is the current method for industrial production of aluminum, and cryolite as a flux is irreplaceable in a short time. For a long time, aluminum electrolytic production has used ordinary molecular ratio cryolite with a molecular ratio of 2.1-2.3 for the roasting start-up of new slots. In order to ensure that the roasting of the new tank can reach a sufficient temperature and establish a regular furnace side with a high melting point after start-up, it is necessary to manually add a large amount of solid soda ash when the electrolytic tank is installed and started, so as to increase the electrolyte molecular ratio to above 2.8; The addition of too much soda ash will eas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/06
Inventor 吴智明赵天德张恒成徐卫东祈合生闫太网胡金平代军王群段亚丽
Owner 山西华圣铝业有限公司
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