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A rare earth electrolyzer repair paste and non-stop repair method

An electrolytic cell and rare earth technology, applied in the direction of electrolytic components, electrolytic process, etc., can solve the problems of reduced electrolytic efficiency and increased cost of electrolytic processing, and achieve the effects of reducing the number of shutdowns, reducing the waste of rare earth resources, and reducing the cost of new additions

Active Publication Date: 2021-09-03
LESHAN YOUYAN RARE EARTH NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the upper edge of the graphite tank is continuously consumed, in order to prevent the fluoride salt melt from overflowing, it is necessary to continuously reduce the liquid level of the fluoride salt melt. After the liquid level of the salt melt drops to 60% of the initial liquid level, after considering comprehensive factors such as cost, only a new graphite tank can be replaced

Method used

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  • A rare earth electrolyzer repair paste and non-stop repair method

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preparation example Construction

[0025] The preparation method of the above rare earth electrolytic cell repair paste is to prepare adhesive and dry material according to the above rare earth electrolytic cell repair paste, mix the adhesive and dry material and put them into a container to heat and soften; the container is a closed container with a pressure reducing valve , to prevent damage to the container due to excessive pressure during the heating process or other potential safety hazards, the heating temperature is 100° C. to 300° C., and the heating time is greater than or equal to 10 minutes.

[0026] A non-stop repairing method for a rare earth electrolytic cell, the repairing steps are as follows:

[0027] S1. Prepare the repair paste according to the preparation method of the above-mentioned rare earth electrolytic cell repair paste, and set it aside;

[0028] S2. During the production process, the anode block 1 closest to the damaged position 10 on the graphite tank body 8 of the rare earth electr...

Embodiment 1

[0033] A repair paste for a rare earth electrolytic cell, comprising the following components in parts by weight: 33 parts of tempered coal tar pitch containing coal tar, 27 parts of graphite powder, 54 parts of anthracite coal powder, and 19 parts of rare earth fluoride powder Among them, the graphite powder is a mixture of graphite powder with a particle size of 0.2mm and 4mm. The proportion of 0.2mm graphite powder is 28%, and the proportion of 4mm graphite powder is 72%.

[0034] The electrolytic cell of the rare earth dysprosium-iron alloy was repaired by using the above-mentioned non-stop repairing method for the rare earth electrolytic cell and the repairing paste for the rare earth electrolytic cell provided in this embodiment. After the repair, the loss rate of the graphite cell was significantly slowed down.

[0035] The filled repair paste material showed obvious loss around the 21st day, and a small amount of the upper edge of the graphite tank was exposed in the ai...

Embodiment 2

[0037] A repairing paste for a rare earth electrolytic cell, comprising the following components in parts by weight: 33 parts of tempered coal tar pitch containing coal tar, 26 parts of graphite powder, 54 parts of anthracite coal powder, and 20 parts of rare earth fluoride powder Among them, the graphite powder is a mixture of graphite powder with a particle size of 0.2mm and 4mm. The proportion of 0.2mm graphite powder is 28%, and the proportion of 4mm graphite powder is 72%.

[0038]The electrolytic cell of the rare earth dysprosium-iron alloy was repaired by using the above-mentioned non-stop repairing method for the rare earth electrolytic cell and the repairing paste for the rare earth electrolytic cell provided in this embodiment. After the repair, the loss rate of the graphite cell was significantly slowed down.

[0039] The filled repair paste material showed obvious loss around the 25th day, and a small amount of the upper edge of the graphite tank was exposed in the ...

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Abstract

The invention provides a rare earth electrolytic cell repair paste and a non-stop repair method, which relate to the technical field of rare earth electrolysis, and include a binder and a dry material at a ratio of 1:3 in parts by weight; wherein the dry material includes The following components in parts by weight: 20-27 parts of graphite powder, 51-55 parts of anthracite powder and 18-26 parts of rare earth fluoride powder; , form a protective layer with a dense structure, and its own oxidation consumption is slow, and it has strong corrosion resistance to the fluoride salt melt in the rare earth electrolytic cell. Due to the existence of the repair paste, the upper edge of the graphite tank is isolated from the air to avoid Or delay the further oxidation loss of the upper edge of the graphite tank body, effectively prolonging the service life of the graphite tank of the rare earth electrolytic tank.

Description

technical field [0001] The invention belongs to the technical field of rare earth electrolysis, and in particular relates to a rare earth electrolytic cell repair paste and a non-stop repair method. Background technique [0002] In the rare earth electrolysis process, the rare earth electrolytic cell is often consumed. For example, the Chinese invention patent application number 201910558107.0 applies for a damage repair method for the rare earth electrolytic crucible, which provides a method for discovering and repairing the loss of the crucible. However, the rare earth The consumption of the electrolytic cell is not only the loss of the crucible, but the upper edge of the graphite tank is also prone to loss. At present, more than 90% of rare earth metals and alloys are prepared by electrolysis of the oxide-fluoride salt system. It has the characteristics of high melting point and strong corrosion. In industry, graphite material with high temperature resistance and corrosio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C7/06C25C3/34
CPCC25C3/34C25C7/06
Inventor 杨宏博严俊邓之金杨桂林颜浩逄增栋韩立国肖银夏爽
Owner LESHAN YOUYAN RARE EARTH NEW MATERIAL CO LTD
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