Aluminum cell cathode carbon block with cylindrical grooves on upper surface and manufacturing method of aluminum cell cathode carbon block

Abstract

The invention belongs to the technical field of aluminum electrolysis, and particularly relates to an aluminum cell cathode carbon block with cylindrical grooves on an upper surface and a manufacturing method of the aluminum cell cathode carbon block. According to the aluminum cell cathode carbon block with the cylindrical grooves on the upper surface, two rows of the cylindrical grooves are arranged in the length direction of the upper surface of the aluminum cell cathode carbon block, the number of each row of the cylindrical grooves is 5 to 8, the diameter of each cylindrical groove is 200 to 300 mm, the depth of each cylindrical groove is 50 to 100 mm, and the two rows of the cylindrical grooves are arranged in a mutually staggered mode. The manufacturing method of the aluminum cell cathode carbon block comprises the following steps of: placing a paste material into a vibration molded box die; pressing a heavy hammer of which the lower surface is provided with cylindrical bulges on the upper surface of the paste material in the box die; performing vibration molding; lifting up the heavy hammer and the box die; pushing a vibration molded block out to form a cathode carbon block green provided with the cylindrical grooves on the upper surface; and placing the cathode carbon block green into a roasting furnace, and roasting the green to obtain the aluminum cell cathode carbon block with the cylindrical grooves on the upper surface. By the method for manufacturing the cathode carbon block, reprocessing of the upper surface of the cathode carbon block is not required, time and labor are saved, and an electrode material is saved.

Description

[0001] technical field [0002] The invention belongs to the technical field of aluminum electrolysis, and in particular relates to an aluminum electrolytic cell cathode carbon block with a cylindrical groove on the upper surface and a manufacturing method thereof. Background technique [0003] Aluminum for industrial use is produced by cryolite-alumina molten salt electrolysis. Aluminum electrolysis production requires a large amount of electric energy. Therefore, power saving is always the main technical problem faced by aluminum electrolysis production. For aluminum electrolysis production, The saving of electric energy is mainly achieved by reducing the cell voltage of the electrolyzer and improving the current efficiency. Before 2008, the DC power consumption of aluminum electrolysis production at home and abroad has always been above 13200kWh / t-Al. On March 2, 2007, Feng Naixiang invented a new type of cathode structure electrolysis cell aluminum electrolysis patent...

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Problems solved by technology

Before 2008, the DC power consumption of aluminum electrolysis production at home and abroad has always been above 13200kWh / t-Al. On March 2, 2007, Feng Naixiang invented a new type of cathode structure electrolysis cell aluminum electrolysis patent technology (ZL200710010523.4), and in After being applied to industrial electrolytic cells, the DC power consumption of aluminum electrolytic production was reduced to about 12000kWh / t-Al. Later, Feng Naixiang invented a patent for an aluminum electrolytic cell (CN101864580A) in which the upper surface of the cathode carbon block was inlaid with columnar protrusions. Technology, which can improve the stability of the cathode aluminum liquid level in the electrolytic cell more effectively than the former, so that the current efficiency loss is less and the power consumption is lower. The upper surface of the cathode carbon block is inlaid with columnar protrusions The characteristic of the cathode structure of the aluminum electrolytic cell is that there are 2 or more rows of protrusions inlaid on the upper surface of each cathode carbon block along the longitudinal direction, and the adjacent two rows of columnar protrusions are arranged alternately. The installation method of the upper surface of the cathode carbon block is to first process a cylindrical groove on the upper surface of the cathode carbon block according to the specified position. The inner wall of the cylindrical groove is threaded, and the lower part of the cylindrical protrusion is also threaded. The protrusions are installed on the upper surface of the cathode carbon block by means of these threads, but in this way, when processing the cylindrical groove on the cathode carbon block, it is time-consuming, laborious, and consumes electrode materials, especially when the processed cathode When the matrix of the carbon block is made of calcined anthracite as the main material, the hardness of the cathode carbon block is very high and it is difficult to process

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