Non-uniform blanking method for aluminum electrolytic bath

Abstract

The invention discloses a non-uniform feeding method for an aluminum electrolytic cell. According to the characteristics of the flow form of the electrolyte in the tank and the distribution of the alumina concentration, the capacity of the constant container at each feeding point is selected, and the obtained constant container is configured using a simulation method. Carry out comparative evaluation to determine the appropriate non-uniform constant container configuration; at the same time, according to the selected constant container capacity, adjust the feeding interval to ensure that the total feeding volume of the electrolytic cell remains unchanged within a certain period of time. By applying the method of the present invention, the size of each constant container can be adjusted in a targeted manner according to the difference in the flow characteristics of each region of the electrolyte in the cell, the regional concentration difference of alumina in the electrolyte can be reduced, the concentration distribution of alumina can be optimized, and the smooth operation of the electrolytic cell can be promoted.

Description

technical field [0001] The invention relates to an aluminum electrolytic cell blanking method, in particular to a non-uniform aluminum electrolytic cell blanking method. Background technique [0002] During the operation of the aluminum electrolytic cell, it is necessary to continuously replenish the reaction raw material alumina, and the modern aluminum electrolytic cell is developing towards a large scale, and the primary problem brought about is the problem of alumina concentration control. The enlargement makes the size of the aluminum electrolytic cell larger and larger, which correspondingly increases the transmission distance and transmission range of alumina in the electrolytic cell, so that the concentration gradient of alumina in the electrolyte increases significantly. [0003] Continuous feeding cannot be realized on the current aluminum electrolytic cell, and it is necessary to rely on multiple feeding devices (also known as fixed containers) for feeding at inte...

AI Technical Summary

Problems solved by technology

The use of a larger constant vessel helps the concentration distribution to be more uniform in space, but the area of ​​the high concentration area changes significantly when a larger constant vessel is used, and the overall alumina concentration gradient in the tank changes more drastically with time. At the same time, it increases the risk of early precipitation of alumina during vertical transportation

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