Molten salt electrolytic refining method and method for recovering and treating cathode deposition thereof

A molten salt electrolysis and recovery treatment technology, applied in the electrolysis process, electrolysis components, etc., can solve the problems of low solution concentration, lack of economy, pressure, etc., to reduce environmental pressure, improve process economy, and reduce recovery energy consumption effect

Active Publication Date: 2014-02-05
PANGANG GROUP RESEARCH INSTITUTE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During leaching, in order to meet the process conditions, a solid-to-liquid ratio of 1:5 to 1:10 must be ensured, and 3 to 5 washes with dilute acid and clean water are required. The cathode wash water obtained in this process contains a certain amount of electrolyte and low Valence metal ions, in which the electrolyte concentration is generally 1-5wt%, direct discharge will increase the overall cost of the process and cause greater pressure on the environment
And the solution concentration is low, so it is not economical to carry out evaporation recovery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] In the process of molten salt electrolytic refining of titanium, 4kg of cathode precipitates in a single furnace, of which the electrolyte content is 25%, of which, TiCl 3 , FeCl 2 , AlCl 3 The content of other impurities is about 1.5%. Prepare 20kg of dilute hydrochloric acid aqueous solution with a concentration of 0.02mol / L, wrap the cathode precipitate with filter cloth and place it in dilute hydrochloric acid solution for leaching. After 30 minutes, the electrolyte is completely dissolved, remove the remaining titanium powder in the filter cloth, and mix it into the obtained solution. hydrochloric acid to maintain the acid concentration at 0.02mol / L. Get the cathode precipitate and continue leaching in the above-mentioned manner. After accumulatively leaching 20kg of the cathode precipitate, put the cathode precipitate into the solution and no longer dissolve, and NaCl crystals are precipitated in the obtained solution. At this point, a NaCl-KCl mixed salt satur...

example 2

[0025] In the process of molten salt electrolytic refining of titanium, 1kg of cathode precipitates in a single furnace, of which the electrolyte content is 80%, of which, TiCl 3 , FeCl 2 , AlCl 3The content of other impurities is about 0.5%. Prepare 7kg of dilute hydrochloric acid aqueous solution with a concentration of 1mol / L, wrap the cathode precipitate with filter cloth and place it in dilute hydrochloric acid solution for leaching. After 20 minutes, the electrolyte is completely dissolved, remove the remaining titanium powder in the filter cloth, and add hydrochloric acid to the resulting solution. , to maintain the acid concentration at 0.5wt%. Take the cathode precipitate and continue leaching in the above-mentioned manner. After accumulatively leaching 2.2 kg of the cathode precipitate, put the cathode precipitate into the solution and no longer dissolve, and NaCl crystals are precipitated in the obtained solution. At this point, a NaCl-KCl mixed salt saturated so...

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PUM

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Abstract

The invention provides a molten salt electrolytic refining method and a method for recovering and treating cathode deposition thereof. The recovering and treating method comprises the following steps: putting the cathode deposition in a dilute acid solution having the acid concentration not lower than 0.01mol / L for extraction to obtain an extract solution; continuously carrying out extraction to obtain a saturated extract solution; adjusting the pH value of the saturated extract solution to form a precipitate; filtering to obtain a settled solution; carrying out crystallization treatment to obtain electrolyte crystals. The refining method comprises the following step: treating the cathode deposition containing the target product by using the recovering and treating method. The method for recovering and treating cathode deposition provided by the invention has the beneficial effects that the electrolyte entrained in the cathode deposition of molten salt electrolytic refining can be separated and recovered without affecting the after treatment process effect of the cathode deposition, and the method is low in recovery energy consumption, good in process economical efficiency and low in environment stress.

Description

technical field [0001] The present invention relates to the technical field of separation and treatment technology of molten salt electrolytic refining products and recovery of additional products, in particular, relates to a recovery process of molten salt electrolytic refining process (for example, process of extracting vanadium / titanium by molten salt electrolytic refining process) A method for precipitates, and a method for molten salt electrolytic refining comprising the method for recovering and treating cathode precipitates of molten salt electrolytic refining. Background technique [0002] Usually, molten salt electrolytic refining extracts vanadium / titanium. Generally, crude vanadium / titanium is used as the anode, the metal material is used as the cathode, and a mixture formed by adding a certain amount of low-valent ions to the alkali metal or alkaline earth metal halide is used as the electrolyte. The electrolytic cell is electrolyzed, and the crude vanadium / coars...

Claims

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Application Information

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IPC IPC(8): C25C7/06C25C3/26C25C3/28
Inventor 邓斌穆宏波朱福兴闫蓓蕾穆天柱
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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