Connection method of cathode carbon blocks and cathode steel bars of aluminum electrolytic cells and construction thereof

Abstract

The invention belongs to the technical field of aluminum production, wherein the key technology aims at developing a connection method of cathode carbon blocks and cathode steel bars of aluminum electrolytic cells by means of multi-grooves inserting and a construction thereof. The bottoms of the cathode carbon blocks (piece 1) are provided with a plurality of grooves; the cathode steel bars (piece2) consist of base plates and a plurality of rib plates welded thereon; the grooves of the cathode carbon blocks are correspondingly inserted with the rib plates of the cathode steel bars to completethe assembly of cathode carbon blocks. Compared with the existing cathode carbon blocks, the invention improves the utilization rate of the cathode carbon blocks, reduces the invalid usage amount ofthe cathode carbon blocks, reduces the mechanical machining quantity for forming steel bar grooves on the cathode carbon blocks, reduces the waste residue quantity of the cathode carbon blocks when overhauling the electrolytic cells, reduces the horizontal current in the cathode carbon blocks, removes the existing asphalt damage caused by carbon element paste when assembling the cathode carbon blocks and roasting the electrolytic cells, increases the iron carbon contact area between the cathode carbon blocks and the cathode steel bars, and prolongs the service life of the electrolytic cells.

Description

technical field [0001] The invention belongs to the technical field of aluminum production. The key technology lies in the development of a connection method and structure for the multi-slot insertion of the cathode carbon block and the cathode steel rod of the aluminum electrolytic cell. The application of the invention can obtain greater economic and environmental benefits. Background technique [0002] 1 Overview [0003] At present, the industrial production method of aluminum in the world is the molten salt electrolysis method. The key equipment for electrolytic aluminum production is the aluminum electrolytic cell, which is mainly composed of two parts, the cathode and the anode. The cathode of an aluminum electrolytic cell is usually composed of dozens of cathode carbon block groups side by side according to the current intensity of the cell. For example, a 240kA electrolytic cell has 20 cathode carbon block groups, and a 350kA electrolytic cell has 32 cathode carbo...

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Problems solved by technology

[0014] ① The utilization rate of cathode carbon block is low, which increases equipment investment and pollutes the environment

Since the effective height ratio of the cathode carbon block in the existing cathode carbon block group is not high, the amount of waste residue will be high during overhaul, so the existing cathode carbon block group type increases the investment in environmental protection

[0018] ②The cathode steel rod groove of the cathode carbon block has a large amount of machining

[0019] At present, the cathode steel rod groove on the cathode carbon block adopts the production method of roasting the cathode carbon block as a whole and then machining the cathode steel rod groove. Due to the large cross-sectional area of ​​the cathode steel rod groove, a large amount of roasting waste is wasted in slotting. carbon blocks, correspondingly waste the energy of roasting carbon blocks, increase the cost of slotting machining, and a large amount of carbon powder will be produced during machining, polluting the production operating environment and equipment

[0020] ③ The cathode carbon block group has a large environmental pollution when it is assembled and the electrolytic cell is roasted and started

This part of the carbon paste contains pitch tar, and its volatile matter content is about 9-13% (national standard value). environmental pollution; and a larger amount of asphalt fume will volatilize from the window of the cathode steel rod on the electrolyzer shell when the electrolyzer is roasted. The environmental pollution of electrolytic production is relatively large in the initial stage of start-up

[0022] ④ The horizontal current component of the cathode carbon block group is relatively large

[0024] ⑤ The iron-carbon voltage drop of the cathode carbon block group is relatively large

Therefore, the current connection method of the cathode carbon block group has a high probability of local damage to the cathode of the electrolytic cell.

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