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A kind of electrochemical method recycles the method for processing low cobalt WC-CO cemented carbide waste

A hard alloy, recycling technology, applied in the direction of optics, process efficiency improvement, photography technology, etc., can solve the problems of inability to judge and control electrochemical dissolution, high power consumption, weak basic research on tungsten hard gold alloy waste, etc.

Inactive Publication Date: 2016-08-17
BEIJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of electrochemical method recycles the method for processing low cobalt WC-CO cemented carbide waste
  • A kind of electrochemical method recycles the method for processing low cobalt WC-CO cemented carbide waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The processed tungsten hard gold alloy waste is cemented carbide with a metal cobalt content of 6%, and the waste is crushed to 10mm. The electrolyte composition is 0.5mol / LH 2 SO 4 , 10g / L of NaF; the electrode spacing d is 20mm, the electrolyte temperature T is 60°C, the ratio of the electrolyte circulation flow rate to the cross-sectional area of ​​the electrolytic cell (called the circulation flow rate, the same below) is 20cm / min; continuous Electrolyze for 100min, stop for 3min. The experimental results show that according to the concentration of metal cobalt in the solution, the calculated current efficiency of cobalt electrolysis is 99.1%. Anode current density D A 200A / m 2 , running continuously for 24 hours, 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 waste is a cemented carbide with a metal cobalt content of 11%, and the waste is crushed to 12mm; the composition of the electrolyte is 0.5mol / LH 2 SO 4 , 10g / L NaF; electrode distance d is 20mm, electrolyte temperature T is 60°C, electrolyte circulation flow rate is 20cm / min; continuous electrolysis for 100min, stop for 3min. Experimental results show that the current efficiency of cobalt electrolysis is 99.5%. Anode current density D A 240A / m 2 , running continuously for 24 hours, the electrolysis efficiency has no obvious change. The measured cell voltage is 1.51 volts, and the calculated power consumption is 1380Kwh / T cobalt.

Embodiment 3

[0027] The processed tungsten hard gold alloy waste is a cemented carbide with a metal cobalt content of 11%, and the waste is crushed to 12mm; the composition of the electrolyte is 0.5mol / LH 2 SO 4 , no additives are used; the electrode distance d is 20mm, the electrolyte temperature T is 60°C, and the electrolyte circulation flow rate is 20cm / min. Continuous electrolysis for 100min, stop for 3min. Experimental results show that the current efficiency of cobalt electrolysis is 99.6%. Anode current density D A 150A / m 2, running continuously for 24 hours, the electrolysis efficiency has no obvious change. The measured cell voltage is 0.82 volts, and the calculated power 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 without the use of additives, anode passivation is prone to occur at high current densities.

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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 fields of chemical industry and resource regeneration. A new process for recycling low-cobalt WC-Co cemented carbide waste by electrochemical method is provided. Background technique [0002] Tungsten is a rare metal and a strategic material, 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 every year, nearly 10,000 tons of waste cemented carbide are caused by various reasons, worth nearly 4 billion yuan. [0003] In the case of resource shortage, high price, and large consumption, all countries regard tungsten-containing scrap alloy as a valuable second resource, and use it as an important means to solve the shortage of resources and reduce the cost of tungsten alloy. It...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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