Current strengthening and efficient energy saving method of prebaked aluminium electrolysis cell

An aluminum electrolytic cell, high-efficiency and energy-saving technology, applied in the field of aluminum electrolysis, can solve the problems of less than 50% utilization rate of electric energy and high pressure of energy-saving and emission reduction in the aluminum electrolysis industry

Inactive Publication Date: 2011-01-05
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Even so, its power utilization rate is still less than 50%, and there is still a certain distance from the goal of "zero effect". The production process still produces a large amount of greenhouse gases, and the aluminum electrolysis industry is facing huge pressure on energy conservation and emission reduction.

Method used

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  • Current strengthening and efficient energy saving method of prebaked aluminium electrolysis cell
  • Current strengthening and efficient energy saving method of prebaked aluminium electrolysis cell
  • Current strengthening and efficient energy saving method of prebaked aluminium electrolysis cell

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Effect test

Embodiment 1

[0061] In the 160kA aluminum electrolysis series and 200kA aluminum electrolysis series of an aluminum plant, through the application of "pre-baked aluminum electrolytic cell current strengthening and high efficiency and energy saving technology", process optimization and control technology transformation and upgrading are carried out online. The main process technical parameters are as follows:

[0062] Anode current density: from 0.72A / cm 2 Increased to 0.83A / cm 2 ;

[0063] Slot working voltage (including the apportioned external busbar voltage drop and other black voltages): reduced from 4.15 to 4.20V to 3.80 to 3.86V (among them, the average working voltage of new slots in the series with a slot age of less than 1 year is 3.66V) ;

[0064] Electrolysis temperature: reduced from 945-955°C to 925-935°C;

[0065] Superheat: 8~12℃;

[0066] Alumina concentration: 1.8-2.5%;

[0067] Anode effect coefficient: ≤0.02 times / tank·day.

[0068] The results of industrial applic...

Embodiment 2

[0070] In the 300kA aluminum electrolysis series and 400kA aluminum electrolysis series of an aluminum plant, through the application of "pre-baked aluminum electrolytic cell current strengthening and high efficiency and energy saving technology", process optimization and control technology transformation and upgrading are carried out online. The main process technical parameters are as follows:

[0071] Anode current density: from 0.72A / cm 2 Increased to 0.81A / cm 2 ;

[0072] Slot working voltage (including black voltage such as apportioned external bus voltage drop): reduced from 4.17 to 4.23V to 3.65 to 3.76V;

[0073] Electrolysis temperature: reduced from 950-965°C to 925-935°C;

[0074] Alumina concentration: 1.8-2.5%;

[0075] Anode effect coefficient: ≤0.018 times / tank·day.

[0076] The results of industrial application and statistical assessment in the past year show that the control accuracy and reliability of process parameters have been significantly improved. ...

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Abstract

The invention discloses a current strengthening and efficient energy saving method of a prebaked aluminium electrolysis cell, comprising the following steps of: adopting a five low, three narrow and one high process in the electrolytic process of the aluminium electrolysis cell, wherein main technical parameters are as follows: electrolytic temperature is 920-935 DEG C, superheat degree is controlled between 8 DEG C and 12 DEG C, the mass concentration of aluminum oxide is 1.8-2.5 percent, anode effect coefficient is less than and equal to 0.02, cell voltage is 3.60-3.90 V, and anodic current density is more than and equal to 0.8 A/cm<2>; and developing an intelligent polycyclic collaborative optimization and control technology matched with the process, therefore the purpose of current strengthening and energy saving of the prebaked aluminium electrolysis cell is achieved. Practices prove that the current strengthening and efficient energy saving method of the prebaked aluminium electrolysis cell can greatly enhance the anode current density and also outstandingly reduces the cell voltage.

Description

technical field [0001] The invention belongs to the technical field of aluminum electrolysis, and in particular relates to a method for current strengthening and high efficiency and energy saving of a prebaked aluminum electrolytic cell. technical background [0002] For more than 100 years, the traditional process of Hall-Heroult method has been used in the production of industrial aluminum electrolysis. Although its basic principle remains unchanged, its production technology has achieved great development. For my country's aluminum electrolysis technology, its process and its control technology have roughly gone through four stages: [0003] The first stage (from the early days of the founding of the People's Republic of China to the mid-1970s): the self-baking aluminum electrolytic cell technology adopted in my country in the early stage, its process characteristics are: the cell working voltage is set at 4.25V, the molecular ratio is 2.7-2.8 higher, and the electrolysis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/06
Inventor 李劼肖胜华吕晓军丁凤其邹忠赖延清张宏安张红亮丁振涛张文根刘驰谢长春万玉浩
Owner CENT SOUTH UNIV
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