Method for roasting aluminum electrolytic tank with special-shaped cathode structure

A technology of aluminum electrolysis cell and cathode structure, which is applied in the field of aluminum electrolysis technology, and can solve problems such as rising unit energy consumption, affecting the economic benefits of production enterprises, and damage to aluminum electrolysis cells

Active Publication Date: 2012-04-11
四川启明星铝业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of grooves increases the difficulty of roasting coke particles. Taking the 300KA large-scale prebaked aluminum electrolytic cell as an example, the aluminum electrolytic cell with a planar cathode structure needs about 800kg of coke particles and about 200kg of graphite powder. The amount of coke particles after the tank will reach 2.5 tons, and the amount of graphite powder will exceed 1 ton. Carbon materials such as coke particles and graphite powder must be salvaged after the aluminum electrolytic cell is started. At the same time, affected by the high temperature factors of the aluminum electrolytic cell, more than 1 ton of carbon slag will remain in the aluminum electrolytic cell, which will have an adverse effect on the normal production of the aluminum electrolytic cell, resulting in the voltage and temperature of the aluminum electrolytic cell If it is too high, the stability of the aluminum electrolytic cell will deteriorate, which will eventually increase the unit energy consumption of primary aluminum
Although the problem of salvage can be overcome if fuel roasting is used to treat aluminum electrolytic cells with special-shaped cathode structures, fuel roasting will cause early damage to aluminum electrolytic cells (data show that an electrolytic aluminum factory uses this method, and electrolytic cells occur within 3 months after start-up) Leakage phenomenon), affecting the economic benefits of production enterprises

Method used

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  • Method for roasting aluminum electrolytic tank with special-shaped cathode structure
  • Method for roasting aluminum electrolytic tank with special-shaped cathode structure
  • Method for roasting aluminum electrolytic tank with special-shaped cathode structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Roasting method

[0046] A. Fill the groove of the shaped cathode with cryolite, and the cryolite is not in contact with the anode;

[0047] B. Lay coke particles on the boss of the shaped cathode so that the coke particles contact the anode;

[0048] C. Add cryolite powder as insulation material, and energize and roast.

[0049] After roasting to meet the requirements, the electrolyte is added, the cryolite melts into the electrolyte, and the coke particles float on the surface of the electrolyte, and the electrolysis can be carried out after removing the floating layer.

[0050] Results: Roasting electricity consumption is 44560kwh, electricity cost is 22280 yuan, carbon residue is 365kg, and there is no sign of damage to the cathode within 1 year of start-up.

Embodiment 2

[0052] Roasting method

[0053] A. Fill the electrolyte block in the groove of the special-shaped cathode, and the electrolyte block is not in contact with the anode;

[0054] B. Lay graphite powder on the boss of the special-shaped cathode so that the graphite powder contacts the anode;

[0055] C. Add cryolite powder as insulation material, and energize and roast.

[0056] After roasting to meet the requirements, the electrolyte is added, the cryolite melts into the electrolyte, the graphite powder floats on the surface of the electrolyte, and the electrolysis can be carried out after removing the floating layer.

[0057] Results: Roasting electricity consumption is 43200kwh, electricity cost is 21600 yuan, carbon residue is 315kg, and there is no sign of damage to the cathode within one year of start-up.

Embodiment 3

[0059] Roasting method

[0060] A. Fill electrolyte block and cryolite in the groove of special-shaped cathode, its weight ratio is 40% of electrolyte block, 60% of cryolite, make electrolyte block and cryolite contact anode;

[0061] B. Laying graphite powder and coke particles on the boss of the special-shaped cathode, the weight ratio is 40% of graphite powder and 60% of coke particles, so that the carbon material contacts the anode;

[0062] C. Add cryolite powder as insulation material, and energize and roast.

[0063] After roasting to meet the requirements, the electrolyte is added, the cryolite and the electrolyte block melt into the electrolyte, the carbon material floats on the surface of the electrolyte, and the electrolysis can be carried out after removing the floating layer.

[0064] Results: Roasting consumes 43900kwh of electricity, the electricity cost is 21950 yuan, the amount of carbon residue is 336kg, and there is no sign of damage to the cathode within 1...

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Abstract

The invention relates to an aluminum electrolytic technology, more specifically relates to a preheating and roasting method for an aluminum electrolytic tank, especially provides a method for roasting the aluminum electrolytic tank with a special-shaped cathode structure. The invention solves the technical problem that the aluminum electrolytic tank with special-shaped cathode structure can be roasted by reducing the amount of a carbon material. The roasting method comprises the following steps: A, filling a basic material in a special-shaped cathode groove, wherein the basic material can not contact with anode; B, laying the carbon material on a convex plate of the special-shaped cathode, wherein the carbon material is contact with anode; C, electrifying and roasting; wherein the basic material is an electrolyte block or/and cryolite. One of the electrolyte block and cryolite can be selected, or a mixture of the electrolyte block and cryolite can be used; any proportion can be employed for mixing. The roasting method of the invention can reduce the carbon material amount, the workload for fishing, and the phenomena of overburn and chipping. The method of the invention provides an effective method for roasting the aluminum electrolytic tank.

Description

technical field [0001] The invention relates to an aluminum electrolysis process, in particular to a preheating roasting method for an aluminum electrolytic cell, in particular to a roasting method for an aluminum electrolytic cell with a special-shaped cathode structure. Background technique [0002] Roasting the aluminum electrolytic cell is the process of preheating the inner lining of the aluminum electrolytic cell, which generally needs to be heated to above 900°C. This process is directly related to the start-up quality of the aluminum electrolytic cell, and affects the later production and service life of the aluminum electrolytic cell, especially the life of the lining of the aluminum electrolytic cell. The purpose and function of roasting the aluminum electrolytic cell are: (1) coking: by roasting the solid paste between the cathode carbon block and the side carbon block to make it coke, so that the cathode carbon block and the side carbon block become a whole; (2 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/08
Inventor 王有来李勇秦卫中李炜煜刘升覃文王世海
Owner 四川启明星铝业有限责任公司
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