Rare earth oxide feeding control method for rare earth electrolytic bath

A technology of rare earth oxidation and control method, which is applied in the direction of electrolytic components, electrolytic process, etc., to achieve the effect of low labor intensity and easy operation

Active Publication Date: 2016-05-25
CENT SOUTH UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, there is currently no such detection device or sensor for detecting the concentration of oxidiz

Method used

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  • Rare earth oxide feeding control method for rare earth electrolytic bath
  • Rare earth oxide feeding control method for rare earth electrolytic bath

Examples

Experimental program
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Effect test

Example Embodiment

[0021] Example 1:

[0022] In this embodiment, the anode effect coefficient is set to 0.05 times / day, the effect interval is 20 days, and the automatic feeding system is set to perform feeding every 3 minutes. During the effect interval, there are two situations where the cell resistance rise rate is higher than 50pΩ / s and the cell voltage fluctuation range is greater than 200mV / s, and the cell voltage rises rapidly above 8.0V for a duration of 10s, it is determined that the anode effect has occurred, and the The anode effect processing is performed. After the anode effect processing is finished, it is transferred to the next round of feeding cycle. At the same time, because the anode effect occurs in the first part of the effect interval of the three equal divisions, the blanking interval is shortened by 10s.

Example Embodiment

[0023] Example 2:

[0024] In this embodiment, the anode effect coefficient is set to 0.05 times / day, the effect interval is 20 days, and the automatic feeding system is set to perform feeding every 1 minute. During the effect interval, the rise rate of cell resistance is higher than 50pΩ / s, the noise intensity of cell is higher than 15mV, the amount of rare earth oxide added in the past 36h is lower than twice the consumption, and the local anode current density is reduced by 70% in 10s. In many cases, the anode effect prediction is carried out and the anode effect processing is carried out. After the anode effect processing is finished, it is transferred to the next round of feeding cycle. At the same time, because the anode effect occurs in the latter part of the effect interval of three equal divisions, the feeding interval is shortened by 2s.

Example Embodiment

[0025] Example 3:

[0026] In this embodiment, the anode effect coefficient is set to 0.05 times / day, the effect interval is 20 days, and the automatic feeding system is set to perform feeding every 100 seconds. Since the anode effect does not occur within the effect interval, when the effect waiting start time is reached, the feeding is stopped and the effect waiting is entered. The anode effect occurs within the preset effect waiting time of 16h, so the anode effect processing is performed immediately, and then the next feeding cycle is transferred, and the blanking interval is not adjusted.

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Abstract

The invention relates to a rare earth oxide feeding control method for a rare earth electrolytic bath. According to the method, effect interval time is set according to the expected effect coefficient, and an automatic feeding device is used for carrying out feeding quantitatively at a certain time intervals within the effect interval time. Corresponding coping modes are adopted according to the fact whether the anode effect occurs or not or anode effect prediction. According to the method, the concentration of rare earth oxide in the rare earth electrolytic bath is controlled within the target range, the situation that the content of the rear earth oxide in the electrolytic bath is too high or too low is avoided, and the method is beneficial for achieving stable, efficient, low-voltage and low-power-consumption operation of the rear earth electrolytic bath. Meanwhile, automatic feeding of the rare earth electrolytic bath is further achieved, operation is simple, and labor intensity of workers is relieved.

Description

technical field [0001] The invention belongs to the technical field of rare earth electrolysis, and in particular relates to a method for controlling feeding of oxidized rare earth in a rare earth electrolytic cell. Background technique [0002] Currently, molten salt electrolysis has been widely used in the large-scale production of rare earth metals. In the electrolysis process, the concentration of rare earth oxide in the electrolyte is one of the important process parameters in the electrolysis process. If the content of rare earth oxide in the electrolyte is too high, precipitation will occur in the electrolytic cell, which will affect the normal operation of the electrolytic cell; if the content of rare earth oxide in the electrolyte is too low, the current efficiency will decrease. The voltage rises sharply, causing the electrolytic cell to overheat, increasing the solubility of the electrolyte to rare earth metals, reducing the current efficiency, and increasing pow...

Claims

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Application Information

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IPC IPC(8): C25C3/34C25C7/06
CPCC25C3/34C25C7/06
Inventor 吕晓军双亚静蒋良兴许真铭曾小鹏
Owner CENT SOUTH UNIV
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