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Method for extracting tungsten carbide and cobalt from waste hard alloy

A technology of cemented carbide and tungsten carbide, which is applied in the direction of carbide, tungsten/molybdenum carbide, nickel halide, etc., can solve the problems of poor flow of electrolytic solution, etc., and achieve pollution problems, uniform heating, and increased contact area effect

Active Publication Date: 2018-11-30
湖南金雕能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention solves the technical problem of the poor flow state of the electrolytic solution in the prior art by providing a method for extracting tungsten carbide and cobalt from waste cemented carbide. In the extraction method, the heating control and solution circulation of the electrolytic cell are adopted Make the solution evenly heated, fully mixed, fully electrolyzed

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  • Method for extracting tungsten carbide and cobalt from waste hard alloy
  • Method for extracting tungsten carbide and cobalt from waste hard alloy
  • Method for extracting tungsten carbide and cobalt from waste hard alloy

Examples

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Effect test

Embodiment 1

[0035] Use a ball mill to crush the hard scrap alloy. When the cobalt content of the hard scrap alloy is less than 11%, the crushed particle size is 4mm. When the cobalt content is greater than 11%, the crushed particle size is 8mm. Put it into the small electrolysis box and place it in the electrolytic tank for electrolysis, add hydrochloric acid with a concentration of 2.0mol / L as the electrolyte, use a 9kw750A rectifier, control the voltage in the small electrolysis box to 0.85V, and the current to 10A, start the heater, and control the electrolyte The temperature is 43°C, the electrolyte is continuously circulated under the action of the acid-resistant pump, and the cobalt is electrolyzed to form a cobalt chloride solution, Co+2HCl=CoCl 2 +H 2 , the non-electrolyzed alloy particles remain in the small electrolytic frame; when the specific gravity of cobalt chloride in the electrolytic solution reaches 1.24kg / dm 3 At the same time, the electrolytic solution containing coba...

Embodiment 2

[0037] Use a ball mill to crush the hard scrap metal. When the cobalt content of the hard scrap alloy is less than 11%, the crushed particle size is 2mm. When the cobalt content is greater than 11%, the crushed particle size is 6mm. Put it into the small electrolysis box and place it in the electrolytic tank for electrolysis, add hydrochloric acid with a concentration of 2.2mol / L as the electrolyte, use a 9kw750A rectifier, control the voltage in the small electrolysis box to 1V, and the current to 10A, start the heater, and control the flow of the electrolyte The temperature is 40°C, the electrolyte is continuously circulated under the action of the acid-resistant pump, and the cobalt is electrolyzed to form a cobalt chloride solution, Co+2HCl=CoCl 2 +H 2 , the non-electrolyzed alloy particles remain in the small electrolytic frame; when the specific gravity of cobalt chloride in the electrolytic solution reaches 1.20kg / dm 3 At the same time, the electrolytic solution contai...

Embodiment 3

[0039] Use a ball mill to crush the hard scrap alloy. When the cobalt content of the hard scrap alloy is less than 11%, the crushed particle size is 6mm. When the cobalt content is greater than 11%, the crushed particle size is less than 10mm. Put it into the small electrolysis box and place it in the electrolytic cell for electrolysis, add hydrochloric acid with a concentration of 2.4mol / L as the electrolyte, use a 9kw 750A rectifier, control the voltage in the small electrolysis box to 0.9V, and the current to 10A, start the heater, control The temperature of the electrolyte is 45°C, and the electrolyte is continuously circulated under the action of the acid-resistant pump, and the cobalt is electrolyzed to form a cobalt chloride solution, Co+2HCl=CoCl 2 +H 2 , the non-electrolyzed alloy particles remain in the small electrolytic frame; when the specific gravity of cobalt chloride in the electrolytic solution reaches 1.15kg / dm 3 At the same time, the electrolytic solution c...

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Abstract

The invention provides a method for extracting tungsten carbide and cobalt from waste hard alloy, and belongs to the technical field. The method comprises the following steps: S1, crushing a hard waste alloy into particles, then loading into an electrolytic small box, placing in an electrolysis tank, electrolyzing, adding hydrochloric acid as an electrolyte solution, starting up a heater, and electrolyzing the electrolyte solution cyclically continuously under the action of an acid-resistant pump; S2, when the specific gravity of cobalt chloride in the electrolyte solution reaches 1.15-1.24 kg / dm<3>, pumping the electrolyte solution containing cobalt chloride into a storage tank, soaking the alloy particles with clear water, and then drying the alloy particles; and S3, carrying out magnetic separation of the dried alloy particles, smashing a cobalt-containing magnetic absorption material into particles with the diameter of 1-6 mm by an air heavy hammer, then loading into the electrolysis tank, electrolyzing again, and separating to obtain tungsten carbide and a cobalt chloride solution. By improvement of the electrolysis tank and the electrolytic process, the cobalt content in thefinished tungsten carbide product after electrolysis is completed is about 0.07%.

Description

technical field [0001] The invention belongs to the technical field of industrial waste gas alloy extraction, and in particular relates to a method for extracting tungsten carbide and cobalt from waste cemented carbide. Background technique [0002] Cemented carbide is mainly made of tungsten carbide and rare metal cobalt, and its economic value and manufacturing cost are relatively high. The recovery of tungsten and cobalt is a very valuable recycling field. The earliest recycling process has high energy consumption, complicated equipment and great impact on the environment. Electrochemical method, there are different process routes using alkali as dielectric, hydrochloric acid or sulfuric acid, and nitric acid as dielectric. The electrochemical method has simple process, low investment, low cost, high efficiency, low labor intensity, and less pollution. Tungsten carbide products It can be returned to hard alloy production directly or after reduction. Cobalt is dissolved f...

Claims

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Application Information

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IPC IPC(8): C01G53/09C01B32/949
CPCC01B32/949C01G53/09C01P2006/80
Inventor 梁培君罗荣华
Owner 湖南金雕能源科技有限公司
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