Zhejiang Huadong Aluminium Industry Co., Ltd. adopted the patented new cathode structure electrolytic cell technology invented by Northeastern University and took the lead in industrial development and application of 200kA series electrolytic cells, achieving significant results. The project was awarded the 2010 China Nonferrous Metals Industry Science and Technology Award by the China Nonferrous Metals Industry Association. And was awarded the first prize of the 2010 Zhejiang Provincial Outstanding Industrial New Product and New Technology Project by Zhejiang Provincial Department of Finance and Zhejiang Provincial Economic and Information Committee.
The project passed the scientific and technological achievements appraisal organized by the China Nonferrous Metals Industry Association on April 13, 2010. The expert group appraised that the project has significant economic and social benefits, significant energy-saving and emission-reduction effects, and the overall technical level has reached the international advanced level. The project is easy to implement on existing electrolytic tanks, and the overall investment is low. It is recommended to speed up the promotion and application.
The key technology and innovation of a new type of cathode structure electrolytic cell is that the bottom surface of the traditional aluminum electrolytic cell is flat, and the aluminum liquid with a height of about 25 cm at the bottom of the electrolytic cell is used as a cathode, and the aluminum liquid periodically fluctuates under the action of a magnetic field. The aluminum liquid fluctuates at a height of 2 cm or more. Therefore, a distance of about 4.5 cm must be maintained between the cathode and the anode in order to prevent the oxidation of the aluminum liquid from causing an increase in energy consumption and a reduction in the output, so that the cell voltage has to be maintained at about 4.1V.
The principle of the new cathode high-efficiency energy-saving electrolysis cell technology is based on the consideration of stabilizing the aluminum liquid surface, reducing the power consumption, and prolonging the service life of the trough. The carbon cathode flat bottom structure of the bottom of the existing aluminum electrolysis cell is changed to have a raised irregular structure on the cathode surface. The raised irregular shaped cathode structure can play a role in slowing down the flow rate and fluctuation of the cathode aluminum liquid, thereby achieving the purpose of improving the aluminum liquid level stability of the aluminum electrolytic cell cathode, thereby reducing the electroplating pitch to 3.5 cm and reducing the electrolyzer voltage. To 3.75V or less, improve the utilization of energy, change the electrolyzer from heat-dissipating type to energy-saving and heat-preservation type, and adjust the technical parameters of electrolyzer according to the change of magnetic field, electric field and thermal field of the electrolyzer, so as to realize While reducing the current efficiency, it has achieved the goal of technological innovation that drastically reduces the power consumption.
After the operation of the new cathode structure electrolytic cell of Huadong Aluminum, the operating voltage of the new cell has been maintained at about 3.72V after nearly two years of operation, and the direct current power consumption per ton of aluminum is 12100 to 12300kwh/t. Al, aluminum ingot comprehensive AC power consumption reached 12950 ~ 13100kwh / t. Al's international leading level compared with ordinary tanks before the transformation, tons of aluminum saving electricity 1024kwh. It is said that this kind of technical renovation project can be completed when the current aluminum production plant can be overhauled in the electrolytic cell, and it can also be used for the new electrolytic aluminum project. At present, there have been more than 40 companies in the same industry at home and abroad to study on the spot. The project has caused great repercussions in the aluminum industry at home and abroad and has received widespread praise.
The project passed the scientific and technological achievements appraisal organized by the China Nonferrous Metals Industry Association on April 13, 2010. The expert group appraised that the project has significant economic and social benefits, significant energy-saving and emission-reduction effects, and the overall technical level has reached the international advanced level. The project is easy to implement on existing electrolytic tanks, and the overall investment is low. It is recommended to speed up the promotion and application.
The key technology and innovation of a new type of cathode structure electrolytic cell is that the bottom surface of the traditional aluminum electrolytic cell is flat, and the aluminum liquid with a height of about 25 cm at the bottom of the electrolytic cell is used as a cathode, and the aluminum liquid periodically fluctuates under the action of a magnetic field. The aluminum liquid fluctuates at a height of 2 cm or more. Therefore, a distance of about 4.5 cm must be maintained between the cathode and the anode in order to prevent the oxidation of the aluminum liquid from causing an increase in energy consumption and a reduction in the output, so that the cell voltage has to be maintained at about 4.1V.
The principle of the new cathode high-efficiency energy-saving electrolysis cell technology is based on the consideration of stabilizing the aluminum liquid surface, reducing the power consumption, and prolonging the service life of the trough. The carbon cathode flat bottom structure of the bottom of the existing aluminum electrolysis cell is changed to have a raised irregular structure on the cathode surface. The raised irregular shaped cathode structure can play a role in slowing down the flow rate and fluctuation of the cathode aluminum liquid, thereby achieving the purpose of improving the aluminum liquid level stability of the aluminum electrolytic cell cathode, thereby reducing the electroplating pitch to 3.5 cm and reducing the electrolyzer voltage. To 3.75V or less, improve the utilization of energy, change the electrolyzer from heat-dissipating type to energy-saving and heat-preservation type, and adjust the technical parameters of electrolyzer according to the change of magnetic field, electric field and thermal field of the electrolyzer, so as to realize While reducing the current efficiency, it has achieved the goal of technological innovation that drastically reduces the power consumption.
After the operation of the new cathode structure electrolytic cell of Huadong Aluminum, the operating voltage of the new cell has been maintained at about 3.72V after nearly two years of operation, and the direct current power consumption per ton of aluminum is 12100 to 12300kwh/t. Al, aluminum ingot comprehensive AC power consumption reached 12950 ~ 13100kwh / t. Al's international leading level compared with ordinary tanks before the transformation, tons of aluminum saving electricity 1024kwh. It is said that this kind of technical renovation project can be completed when the current aluminum production plant can be overhauled in the electrolytic cell, and it can also be used for the new electrolytic aluminum project. At present, there have been more than 40 companies in the same industry at home and abroad to study on the spot. The project has caused great repercussions in the aluminum industry at home and abroad and has received widespread praise.
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