Pretreatment method for cathode deposition of molten salt electrorefining

A technology of molten salt electrolysis and precipitation, applied in the direction of grain processing, etc., can solve problems such as environmental pressure and affecting process economy, achieve the goal of reducing environmental pressure, reducing the amount of dilute acid used, the number of washing times with clean water, and reducing the electrolyte content Effect

Inactive Publication Date: 2013-05-22
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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AI Technical Summary

Problems solved by technology

Since the cathode precipitate contains a large amount of electrolyte, a large amount of dilute acid is required for leaching, the solid-to-liquid ratio is generally 1:5 to 1:10, and 6 to 7 times of dilute acid and water washing are required. This process will generate a large amount of additional products and spent acid, which will seriously affect the process economics and cause great pressure on the environment

Method used

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  • Pretreatment method for cathode deposition of molten salt electrorefining

Examples

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example 1

[0027] Take 1500g of titanium cathode precipitate, which contains 85% of the electrolyte. After crushing, it is ball milled in a ball mill to a particle diameter of 150μm. The mixture powder is placed in a separating device, and the feeding speed is controlled to 0.5kg / min through a feeding valve. The flow rate was 5L / min. After the separation, the electrolyte content in the titanium powder was tested to be 9.8%.

example 2

[0029] Take 1500g of titanium cathode precipitate, which contains 85% of the electrolyte. After crushing, it is ball milled in a ball mill to a particle diameter of 44μm. The mixture powder is placed in a separation device, and the feeding speed is controlled to 10kg / min through the feeding valve to control the air flow. It is 25L / min. After the separation, the electrolyte content in the titanium powder is 5.0%.

example 3

[0031] Take 1500g of the vanadium cathode precipitate and crush it. The electrolyte content is 85%. It is ball milled in a ball mill to a particle diameter of 74μm. The mixture powder is placed in a separation device. The feeding speed is controlled to 5kg / min through the feeding valve and the gas flow is controlled. It is 10L / min. After the separation, the electrolyte content in the titanium powder is 8.2%.

[0032] It can be seen that the electrolyte content in the cathode precipitate treated by the method of the present invention can be reduced to 5-10%.

[0033] In summary, the pretreatment method of the present invention is suitable for processing cathode precipitates of molten salt electrorefining; it can realize the separation of electrolyte and metal powder, effectively reduce the electrolyte content in cathode precipitates; and can reduce wet treatment The amount of dilute acid used in the process and the times of washing with clean water can improve process economy and re...

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Abstract

The invention discloses a pretreatment method for cathode deposition of molten salt electrorefining. The method comprises the following steps of: breaking and ball-milling the cathode deposition in an inert gas shielding environment to obtain a mixture of metal powder and electrolyte powder, wherein the granularity of the mixture is 44-150 microns; and pneumatically separating the mixture powder through airflow so as to separate the metal powder and the electrolyte powder. The pretreatment method disclosed by the invention has the advantages that the separation of the electrolyte and the metal powder is achieved so as to effectively reduce the electrolyte content of the cathode deposition; and the dosage of diluted acid and the frequency of clean water washing in a wet treatment process can be reduced so as to improve process economical efficiency and reduce environment pressure.

Description

Technical field [0001] The invention relates to the technical field of separation and treatment of molten salt electrolytic refining products, and more specifically, to a method for pretreatment of cathode precipitates obtained by a process of extracting vanadium and titanium from molten salt electrolytic refining. Background technique [0002] Usually, molten salt electrolytic refining is used to extract vanadium / titanium. Generally, crude vanadium / titanium is used as the anode, the metal material is the cathode, the electrolyte is an alkali metal or alkaline earth metal halide and a certain amount of low-valent ions are added to it to form an electrolytic cell for electrolysis. The crude vanadium / titanium dissolves at the anode and enters the molten salt in the form of ions, and migrates to the cathode under the action of electric field force and concentration gradient to form cathode precipitates. The cathode precipitates after cooling are massive solids. [0003] In addition to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C21/00B02C23/20
Inventor 邓斌穆天柱闫蓓蕾朱福兴穆宏波
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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