A method for cutting aluminum electrolytic cells based on pole-changing cycle
An aluminum electrolytic cell and electrolytic cell technology, which is applied in the field of aluminum electrolytic cell blanking based on the pole change cycle, can solve the problems of electrolytic cell instability, alumina precipitation, voltage swing, etc., to optimize regional concentration distribution and reduce influence. , the effect of reducing the local current distribution
Active Publication Date: 2020-04-07
CENT SOUTH UNIV
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Problems solved by technology
As a result, in the production of aluminum electrolysis, the electrolytic cell will be in an unstable state for several hours after the anode is replaced, the voltage swing is serious, and the flicker effect or alumina precipitation occurs frequently.
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Embodiment
[0056] Such as figure 1 As shown, a method for cutting aluminum electrolytic cells based on the pole-changing cycle includes the following steps:
[0057] Step 1: During the electrolysis process, based on the configuration of the anode replacement cycle in the electrolytic cell, such as figure 2 As shown in , make statistics on the change of the anode current distribution near the feeding point with time;
[0058] The 400kA electrolytic cell selected in this example has a total of 48 anodes, which are divided into 24 groups. The 6 feeding points are respectively controlled and controlled by 4 groups. The pole change cycle is 28 days. The pole change cycle is as follows: figure 2 shown.
[0059] Step 2: Organize the full-cycle current distribution calculated in step 1 into a graph, where the following material point FD5 is taken as an example, the changes in the full-cycle anode current distribution of groups A9, A10, B9, and B10 are as follows image 3 shown. from which ...
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The invention discloses an aluminum electrolytic cell discharging method based on the anode replacement period. Based on the configuration of the anode replacement period in an electrolytic cell, statistics and analysis are carried out on the change conditions of current distribution of anodes nearby the discharging point along with time under the replacement condition; on the premise of guaranteeing that the main discharging quantity meets the production requirement, based on the current change rule, the discharging speed and the discharging quantity of the electrolytic cell are adjusted, andtherefore the problems of non-uniform current distribution and non-uniform in-cell aluminum oxide concentration caused by anode replacement are changed fundamentally; and area concentration distribution of aluminum oxide in aluminum oxides nearby new anodes is optimized, and the great value is achieved on guaranteeing efficient and stable operating of the electrolytic cell with the anodes replaced.
Description
technical field [0001] The invention relates to a method for unloading an aluminum electrolytic cell, in particular to a method for unloading an aluminum electrolytic cell based on a pole-changing cycle. Background technique [0002] Maintaining the current and voltage stability of the aluminum electrolytic cell is extremely critical to the smooth progress of the normal production of aluminum electrolysis. Since the current aluminum electrolysis industry uses prebaked anodes, that is, in the production process, due to the continuous consumption of anodes, it is necessary to replace the anodes of the electrolytic cell according to a certain cycle of electrode replacement. Basically, each cell will have an anode replacement every day. operation. The new anode is at room temperature and placed in a melt at 950°C. Since the new anode, whose temperature is much lower than that of the electrolyte, rapidly cools the electrolyte close to it, a non-conductive electrolyte crust will ...
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IPC IPC(8): C25C3/20
CPCC25C3/20
Inventor 张红亮王佳成李劼邹忠丁凤其
Owner CENT SOUTH UNIV