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Method for extracting gallium through ultrasonic-assisted intensified electrolysis

An electrolytic extraction and ultrasonic-assisted technology, which is applied in the direction of photographic auxiliary process, process efficiency improvement, photographic process, etc., to achieve the effects of reduced activity, stable operation, and improved reaction rate and current efficiency

Inactive Publication Date: 2012-10-03
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In summary, the application of ultrasonic field in the process of electrolytic extraction of gallium metal may improve the extraction rate and efficiency of gallium

Method used

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  • Method for extracting gallium through ultrasonic-assisted intensified electrolysis
  • Method for extracting gallium through ultrasonic-assisted intensified electrolysis
  • Method for extracting gallium through ultrasonic-assisted intensified electrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Prepare 750mL of electrolyte solution with a mass concentration of Ga(Ⅲ) (representing trivalent gallium metal) of 1g / L and a mass fraction of NaOH of 10%;

[0024] (2) Stainless steel electrodes are used, the anode is derusted and degreased before electrolysis, and the cathode is derusted and degreased as well as anode activation pretreatment;

[0025] (3) Place the electrolytic cell in an ultrasonic field, control the electrolysis temperature to 40°C, use direct current, and the current density is 1000A / m 2 , under the conditions of ultrasonic frequency 40KHz, ultrasonic power 120W, electrolysis for 3 hours, the current efficiency of electrolytically extracting gallium metal is 4.4%; the same situation under the condition of non-ultrasonic field, the current efficiency is only 3.1%.

Embodiment 2

[0027] (1) Prepare 750mL of electrolyte solution with Ga(Ⅲ) mass concentration 1g / L and NaOH mass fraction 10%;

[0028] (2) Stainless steel electrodes are used, the anode is derusted and degreased before electrolysis, and the cathode is derusted and degreased as well as anode activation pretreatment;

[0029] (3) Place the electrolytic cell in an ultrasonic field, control the electrolysis temperature to 40°C, use direct current, and the current density is 1000A / m 2 , under the conditions of ultrasonic frequency 40KHz, ultrasonic power 200W, electrolysis for 3 hours, the current efficiency of electrolytically extracting metal gallium is 4.6%; the same situation under the condition of non-ultrasonic field, the current efficiency is only 3.1%.

Embodiment 3

[0031] (1) Prepare 750mL of electrolyte solution with Ga(Ⅲ) mass concentration 2.7g / L and NaOH mass fraction 10%;

[0032] (2) Stainless steel electrodes are used, the anode is derusted and degreased before electrolysis, and the cathode is derusted and degreased as well as anode activation pretreatment;

[0033] (3) Place the electrolytic cell in an ultrasonic field, control the electrolysis temperature to 40°C, and use direct current with a current density of 500A / m 2 , under the condition of ultrasonic frequency 40KHz, ultrasonic power 500W, electrolysis for 6h, the current efficiency of electrolytically extracting metal gallium is 20.2%; the same situation under the condition of non-ultrasonic field, the current efficiency is only 12.4%.

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Abstract

The invention discloses a method for extracting gallium through ultrasonic-assisted intensified electrolysis, which belongs to the technical field of the electrolytic extraction of gallium. The method comprises the steps of adding a cathode and an anode subjected to preprocessing into an electrolytic bath containing gallium-contained solution, applying ultrasonic field to the gallium-contained solution, and electrifying to perform the electrolytic extraction of gallium at 20 to 50 DEG C and 100 to 2000A / m<2>. As ultrasonic cavitation microjet has intensive stirring effect on the solution, the thickness of a diffusion layer on the surface of an electrode is reduced, and the reaction rate and the current efficiency are improved. In addition, the ultrasonic effect accelerates the speed of hydrogen bubble separated from the surface of the electrode, on one hand, the influence on practical current density by hydrogen is reduced or eliminated, on the other and, electrodeposited gallium is uniform and dense, the activity is reduced, and re-dissolution of the deposited gallium is also inhibited. The method for extracting gallium through ultrasonic-assisted intensified electrolysis has the advantages of simple process, easiness in operation and the like.

Description

technical field [0001] The invention belongs to the technical field of electrolytic extraction of gallium metal, and in particular relates to a method for ultrasonically assisted enhanced electrolytic extraction of metallic gallium. technical background [0002] Gallium metal has almost no independent mineral deposits in nature and can only be recovered as a by-product in the processing of other minerals. Today, 90% of primary gallium is extracted from the circulating mother liquor produced by alumina. In production, gallium-rich solutions or gallium concentrates are usually obtained through milk of lime method, carbonation or resin adsorption, and then the solution is made by alkalization in NaOH Electrolysis of sodium gallate in alkaline solution to obtain metal gallium. [0003] In the process of electrolytic extraction of gallium metal, due to the low concentration of Ga(Ⅲ) in the electrolyte (generally 1-3g / L), the electrolysis process is controlled by the mass transfe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/22
CPCY02P10/20
Inventor 王志王明涌孙俊民刘玲张占军张靖峰
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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