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Method for electrochemically recycling low-cobalt WC-Co hard alloy waste material

A cemented carbide, recycling and processing technology, applied in optics, process efficiency improvement, photography process and other directions, can solve the problems of no systematic conclusion, low metal yield, uncontrollable process, etc.

Inactive Publication Date: 2014-05-07
BEIJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the process of treating tungsten carbide by electrochemical dissolution method has been studied, there are still problems such as low current efficiency, low metal yield, and high power consumption. insoluble problem
[0006] The main reason for the above phenomenon is that the basic research on the treatment of tungsten hard gold alloy waste by electrochemical dissolution method is still very weak for a long time, and its internal law has not been really proved, and no systematic conclusion has been formed, so it is impossible to judge and control the electrolytic process. Reactions related to chemical dissolution, showing the uncontrollability of the process

Method used

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  • Method for electrochemically recycling low-cobalt WC-Co hard alloy waste material
  • Method for electrochemically recycling low-cobalt WC-Co hard alloy waste material

Examples

Experimental program
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Effect test

Embodiment 1

[0023] The processed tungsten hard gold alloy scrap is a cemented carbide with a metal cobalt content of 6%, and the scrap is crushed to 10mm and the electrolyte composition is 0.5mol / LH 2 SO 4 , 10g / L NaF; the electrode spacing d is 20mm, the electrolyte temperature T is 60℃, the ratio of the electrolyte circulation flow rate to the cross-sectional area of ​​the electrolytic cell (called the circulating flow rate, the same below) is 20cm / min; continuous Electrolyze for 100min and stop for 3min. The experimental results show that according to the concentration of metallic cobalt in the solution, the calculated current efficiency of cobalt electrolysis is 99.1%. Anode current density D A 200A / m 2 , Continuous operation for 24h, the electrolysis efficiency has no obvious change. The measured cell voltage is 1.26 volts, and the calculated power consumption is 1156Kwh / T cobalt.

Embodiment 2

[0025] The processed tungsten hard gold alloy scrap is a cemented carbide with a metal cobalt content of 11%, and the scrap is crushed to 12mm; the electrolyte composition is 0.5mol / LH 2 SO 4 , 10g / L NaF; electrode spacing d is 20mm, electrolyte temperature T is 60℃, electrolyte circulation flow rate is 20cm / min; continuous electrolysis for 100min, stop for 3min. The experimental results show that the current efficiency of cobalt electrolysis is 99.5%. Anode current density D A 240A / m 2 , Continuous operation for 24h, the electrolysis efficiency has no obvious change. The measured cell voltage is 1.51 volts, and the calculated electrical energy consumption is 1380Kwh / T cobalt.

Embodiment 3

[0027] The processed tungsten hard gold alloy scrap is a cemented carbide with a metal cobalt content of 11%, and the scrap is crushed to 12mm; the electrolyte composition is 0.5mol / LH 2 SO 4 , No additives are used; the electrode spacing d is 20mm, the electrolyte temperature T is 60°C, the electrolyte circulation flow rate is 20cm / min and the continuous electrolysis is 100min, and the stop is 3min. The experimental results show that the current efficiency of cobalt electrolysis is 99.6%. Anode current density D A 150A / m 2 , Continuous operation for 24h, the electrolysis efficiency has no obvious change. The measured cell voltage is 0.82 volts, and the calculated electrical energy consumption is 750Kwh / T cobalt. Further increase the current density to 175A / m 2 After 90 minutes of electrolysis, the cell voltage rose sharply to 1.42 volts. It can be seen that no additives are used, and anode passivation is prone to occur under high current density.

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Abstract

The invention discloses a novel process for electrochemically recycling low-cobalt WC-Co hard alloy waste material. The method is characterized in that the WC-Co hard alloy waste material is electrochemically treated in a pulse current way in special electrolyte medium, i.e. the WC-Co hard alloy waste material is used as an anode, titanium or stainless steel is used as a cathode, the constitution of the electrolyte is systematically formulated according to the difference of the electrochemical behavior and complexing chemical behavior of WC and Co, the pulse current electrolysis way is developed, the difficulty for passivating the anode can be effectively solved, the entire process is simple, the electrolysis efficiency is high, and the metal recovery rate is high.

Description

Technical field [0001] The invention belongs to the field of chemical industry and resource regeneration. A new process for recovering and treating low-cobalt WC-Co cemented carbide waste by electrochemical method is provided. Background technique [0002] Tungsten is a rare metal and a strategic material as well as an important strategic resource for the development of high-tech and cutting-edge technology. At the same time, the tungsten products industry produces a large amount of tungsten alloy waste every year. According to statistics, among the more than 23,500 tons of cemented carbide products in my country each year, the waste cemented carbide products caused by various reasons are as many as nearly 10,000 tons each year, worth nearly 4 billion yuan. [0003] In the absence of resources, high prices, and large quantities, all countries regard tungsten-containing waste alloys as a valuable second resource, and use them as an important means to solve the lack of resources an...

Claims

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Application Information

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IPC IPC(8): C22B7/00C25C1/08C25C1/06
CPCY02P10/20
Inventor 聂华平聂祚仁王秀红席晓丽杨幼明
Owner BEIJING UNIV OF TECH
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