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Molten salt electrolytic refining method and separation method of cathode precipitates thereof

A separation method, molten salt electrolysis technology, applied in the separation of molten electrolytic refining cathode precipitates, molten salt electrolytic refining field, can solve the problems of difficult recovery and reuse of electrolyte, low process economy, poor separation effect, etc., to achieve convenient condensation Recycling, high separation efficiency and low overall cost

Active Publication Date: 2022-01-04
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Adopt the above-mentioned method, need to consume a large amount of dilute acid and through washing many times, cause process economy to be low, separation effect is poor; Can produce a large amount of additional products and waste acid in the reaction process, cause serious impact on environment; And electrolyte dissolves in dilute acid solution Finally, it is difficult to recycle and reuse electrolytes, resulting in waste of resources
[0005] Therefore, there is still room for improvement in the prior art in terms of recycling electrolytes and separating electrolytes from metals

Method used

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  • Molten salt electrolytic refining method and separation method of cathode precipitates thereof

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Embodiment 1

[0037] Take 15kg of electrolytic titanium cathode precipitate, wherein the electrolyte is NaCl-KCl-TiCl n (2≤n≤3), the electrolyte content is 85wt%, the electrolytic titanium cathode precipitate is heated to 850 ° C, after the electrolyte contained therein is completely melted, the electrolytic titanium cathode precipitate is put into a centrifuge for centrifugation, and the centrifuge The rotation speed of the separation is 5000r / min. After separation for 20 minutes, the molten liquid electrolyte is drained, and the liquid electrolyte is recovered after condensation and crystallization to obtain 11.9kg of solid electrolyte. After calculation, the separation rate of the liquid electrolyte after centrifugation is 93.3%. The residue after centrifugal separation of most of the electrolytes was distilled under reduced pressure, the distillation temperature was 1000°C, the distillation pressure was 1Pa, and the distillation time was 2h to obtain 2.2kg of titanium powder and 0.85kg of ...

Embodiment 2

[0039] Take 15kg of electrolytic titanium cathode precipitate, wherein the electrolyte is LiCl-KCl-TiCl n (2≤n≤3), the electrolyte content is 55.1wt%, the electrolytic titanium cathode precipitate is heated to 400 ° C, after the electrolyte contained therein is completely melted, the electrolytic titanium cathode precipitate is put into a centrifuge for centrifugation, centrifuged The separation speed of the machine is 30000r / min. After separation for 40 minutes, the molten liquid electrolyte is drained, and the liquid electrolyte is recovered after condensation and crystallization to obtain 7.9kg of solid electrolyte. After calculation, the separation rate of liquid electrolyte after centrifugation is 95.6%. ; After centrifuging most of the electrolyte, the residue is subjected to vacuum distillation at a distillation temperature of 750°C and a distillation pressure of 2×10 -1 Pa, distillation time 3h, 6.7kg of titanium powder and 0.35kg of solid electrolyte were obtained. Th...

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Abstract

The invention discloses a separation method of cathode precipitates in molten salt electrolysis. The method comprises the following step of heating the cathode precipitates to a preset temperature to completely melt electrolyte contained in the cathode precipitates; after the electrolyte contained in the cathode precipitates is completely melted, carrying out centrifugal separation to separate out the liquid electrolyte; and after the liquid electrolyte is separated out, carrying out reduced pressure distillation on the residues so as to separate the residual electrolyte from metal powder. According to the method, most of liquid electrolyte and metal powder are preliminarily separated through heating treatment and centrifugal separation of the cathode precipitates, then the residues are subjected to reduced pressure distillation to realize the separation of part of residual electrolyte and the metal powder, and the method has the advantages of being high in separation efficiency, good in effect, capable of recycling the separated electrolyte and environmental-friendly.

Description

technical field [0001] The invention relates to the field of metal refining, in particular to a molten salt electrolytic refining method and a separation method for molten electrolytic refining cathode precipitates. Background technique [0002] Usually, molten salt electrolytically extracts titanium / refined titanium. Generally, crude titanium and titanium-containing materials are used as anodes, one or more mixtures of alkali metals and / or alkaline earth metal halides are used as electrolytes, and metal materials are used as cathodes. Electrolysis is carried out in the pool, and the coarse titanium dissolves at the anode and enters the molten salt in the form of ions, and migrates to the cathode for precipitation under the action of the electric field force and concentration gradient to form cathode precipitates, and the cooled cathode precipitates are massive solids. In addition to the crystallized metal powder, the cathode precipitate also contains a large amount of elect...

Claims

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Application Information

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IPC IPC(8): C25C3/28C25C7/06
CPCC25C3/28C25C7/06Y02P10/20
Inventor 邓斌穆天柱彭卫星穆宏波
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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