Low-constant-temperature closed magnesium electrolysis device

Abstract

The invention relates to the field of magnesium electrolysis devices for magnesium chloride electrolysis, and particularly discloses a low-constant-temperature closed magnesium electrolysis device. The low-constant-temperature closed magnesium electrolysis device comprises a tank shell, a magnesium electrolysis device refractory lining, a partition wall, a flow guide block, an anti-corrosion belt brick, a back wall, a feeding channel, a melt cooler and a heating electrode; and a flexible expansion plate is arranged between the magnesium electrolysis device refractory lining and the tank shell. According to the low-constant-temperature closed magnesium electrolysis device, low-constant-temperature closed electrolysis of magnesium chloride can be achieved, the purity of produced liquid magnesium is high, refining is not needed, the quantity of sublimates and tank slag is small in the electrolysis process, a large number of sublimate treatment devices do not need to be arranged, the construction investment is saved, and the maintenance cost of the equipment and pipelines is reduced; and finally, the purpose of reducing the production cost is achieved. In addition, due to the arrangement of the reaction chamber cover seal and the anode seal, the concentration of produced chlorine is far higher than that of a traditional magnesium electrolysis device, which can be directly applied to downstream production procedures, the additional value of products of the magnesium electrolysis device is further improved, and meanwhile the working environment is improved.

Description

technical field [0001] The present application relates to the field of magnesium electrolysis devices for electrolyzing magnesium chloride, in particular to a low constant temperature closed magnesium electrolysis device. Background technique [0002] Metal magnesium is a new type of lightweight corrosion-resistant metal material developed in the 20th century. It is widely used in automobile manufacturing, light industry, metallurgical industry, chemical industry, electronic industry and instrument manufacturing industry. Magnesium is used as a raw and auxiliary material for the above-mentioned downstream industries, and its quality is directly related to the product quality of the downstream industries, and the quality of magnesium is mainly reflected in the purity of magnesium. [0003] The smelting methods of magnesium include electrolysis and Pidgeon method. Although the production cost of the Pidgeon method has certain advantages over the electrolysis method, from the ...

AI Technical Summary

Problems solved by technology

For the case of low melt temperature, traditional magnesium electrolysis devices increase the tank temperature by adjusting the intensity of a series of direct currents or artificially creating reaction interval short circuits, but these will inevitably affect the output of magnesium electrolysis devices, the former even It will affect the operation of the whole series of magnesium electrolysis equipment

Although there are also methods of using AC heating electrodes to increase the tank temperature, but from the previous point of view, this method of raising the tank temperature with AC heating electrodes is not mature enough. When the AC heating electrodes are used for a long time, the installation place of the AC heating electrodes will be Frequent melt leakage accidents, even a large amount of melt leakage caused the magnesium electrolysis device to be scrapped

For the case where the melt temperature is too high, traditional electrolysis devices use compressed air to blow the melt to cool down or cut off the direct current, but these two methods will still affect the operation of the magnesium electrolysis device, and the cooling effect is not good, and the cooling time longer

[0007] The traditional magnesium electrolysis device feeds the melt directly from the metal chamber cover or the reaction chamber cover. During this process, the added material will inevitably disturb the magnesium layer on the surface of the melt, destroy the electrolyte film covering the surface of the magnesium layer, and even There is also the contamination of liquid magnesium due to the presence of impurity components in the material, which affects the purity of liquid magnesium

[0008] The reaction chamber of the traditional magnesium electrolysis device has a single sealing measure, which makes it difficult to ensure the sealing effect of the reaction chamber under high temperature and strong gas corrosion environment, making it impossible for the chlorine gas concentration to reach more than 90% and to be directly used as raw material for downstream processes

Purification of this low-concentration chlorine gas is difficult and costly, and most of the unqualified chlorine gas can only be neutralized with lye as a waste product, and the processing cost is extremely high

In addition, the single sealing measures of the reaction chamber in the past will also cause chlorine gas to leak out of the reaction chamber, resulting in the deterioration of the working environment of the operators.

[0009] In the middle and late stages of the operation of the traditional electrolysis device, due to the severe erosion of the bottom of the graphite anode due to the melt circulation, the thickness loss of the bottom of the anode is as high as 5-10 mm / month, which indirectly causes the width of the reaction interval in the vertical and horizontal directions. Severe unevenness, which in turn leads to the destruction of the thermal balance of the magnesium electrolysis device, as well as the decline in current efficiency and output

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