Method for recycling tungsten carbide and metallic cobalt through waste tungsten-cobalt cemented carbide

A cemented carbide and tungsten carbide technology, which is applied in the field of recycling tungsten carbide and metal cobalt from waste tungsten-cobalt cemented carbide, can solve the problems of low-grade recycled alloy, high iron and oxygen content, cobalt metal loss, etc., and can achieve large-scale Small size, short process, and complete specifications

Active Publication Date: 2016-11-23
GANZHOU HUAXIN METAL MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are more than ten kinds of waste cemented carbide recycling methods used in industrialization, such as saltpeter method, sodium sulfate smelting method, chlorination method, phosphoric acid leaching method, high temperature treatment method, crushing method, electrolysis method, zinc melting method and redox method. , but these existing methods still have poor applicability, high iron and oxygen content, high energy consumption, loss of cobalt metal, easy to cause fouling, pollute the environment, long process, large investment, and need related hydro-smelting plants to support and regenerate alloy grades Low and many other problems

Method used

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  • Method for recycling tungsten carbide and metallic cobalt through waste tungsten-cobalt cemented carbide
  • Method for recycling tungsten carbide and metallic cobalt through waste tungsten-cobalt cemented carbide
  • Method for recycling tungsten carbide and metallic cobalt through waste tungsten-cobalt cemented carbide

Examples

Experimental program
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Effect test

Embodiment 1

[0030] according to figure 2 The process is carried out: take 1000.0g of YG3 waste tungsten-cobalt cemented carbide, immerse it in the cemented carbide cleaning tank, the temperature is 40°C, the frequency of the ultrasonic generator is 25kHz, stir constantly, and wash away the sediment and oil entrained by the raw material Wait for impurities, then immerse in clean water at 60°C to wash, and dry to obtain 987.2 g of clean raw materials. Put the clean raw material in the graphite crucible of the internal heating vacuum furnace, install the transition section and the cobalt crystallizer, evacuate, wait until the pressure in the furnace drops to 5Pa, start the heating system, and raise the temperature to 400°C at a heating rate of 5°C / min , keep warm for 25min, when the pressure in the furnace drops below 1Pa during the keep warm process, start the high vacuum system, and keep warm. The temperature was raised to 1700°C at a heating rate of 5°C / min, the temperature was raised t...

Embodiment 2

[0032] according to figure 2 The process flow is carried out: Take 1000.0g of YG5 waste tungsten-cobalt cemented carbide, immerse it in the cleaning tank, the temperature is 45°C, the frequency of the ultrasonic generator is 25kHz, stir continuously, and wash away the impurities such as sediment and oil entrained in the raw material , then immersed in 60°C clear water to wash, and then dried to obtain 985.4 g of clean raw materials. Put the clean raw material in the graphite crucible of the internal heating vacuum furnace, install the transition section and the cobalt crystallizer, vacuumize, wait until the pressure in the furnace drops to 6Pa, start the heating system, and raise the temperature to 420°C at a heating rate of 6°C / min , keep warm for 30min, when the pressure in the furnace drops below 1Pa during the keep warm process, start the high vacuum system, and keep warm. The temperature was raised to 1650°C at a heating rate of 6°C / min, the temperature was raised to 16...

Embodiment 3

[0034] according to figure 2 The process is carried out as follows: Take 1000.0g of YG15 waste tungsten-cobalt cemented carbide, immerse it in the cleaning tank, the temperature is 50°C, the frequency of the ultrasonic generator is 25kHz, stir continuously, and wash away the impurities such as sediment and oil entrained in the raw material , and then immersed in clean water at 70°C for cleaning, and then dried to obtain 983.0 g of clean raw materials. Put the clean raw material in the graphite crucible of the internal heating vacuum resistance furnace, install the transition section and the cobalt crystallizer, evacuate, wait until the pressure in the furnace drops to 3Pa, start the heating system, and raise the temperature to 440 at a heating rate of 10°C / min ℃, keep warm for 20 minutes, when the pressure in the furnace drops below 1Pa during the heat preservation process, start the high vacuum system, and the heat preservation ends. The temperature was raised to 1600°C at ...

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Abstract

The invention relates to the technical field of recycling of waste tungsten alloy, and provides a method for recycling tungsten carbide and metallic cobalt through waste tungsten-cobalt cemented carbide. The technological process comprises the steps that waste tungsten-cobalt cemented carbide is cleaned and dried, vacuum cobalt extraction is conducted in a graphite crucible, tungsten carbide with a loose and porous structure is obtained in the crucible, loose and porous tungsten carbide is subjected to crushing and grinding to obtain tungsten carbide power, cooling crystallization is conducted in a cobalt crystallizer, and metallic cobalt powder is obtained. According to the method for recycling tungsten carbide and metallic cobalt through waste tungsten-cobalt cemented carbide, the cobalt extraction process is conducted in a high vacuum closed environment, smudging does not exist, impurities are removed through volatilization, a product is subjected to purification, and high-quality tungsten carbide can be obtained; the purity of cobalt powder extracted through a vacuum method is high, the condition of extracting cobalt is adjusted, and the cobalt powder with different particle sizes can be obtained. The method for recycling tungsten carbide and metallic cobalt through waste tungsten-cobalt cemented carbide is wide in applicability, simple in equipment, low in energy consumption, not prone to smudge, free of pollution, high in recovery rate, low in cost and flexible in scale, and a new way for recycling waste tungsten-cobalt cemented carbide in an efficient and green mode is opened up.

Description

technical field [0001] The invention relates to the technical field of recycling waste tungsten alloys, in particular to a method for recycling tungsten carbide and metallic cobalt from waste tungsten-cobalt cemented carbide. Background technique [0002] Cemented carbide is an alloy made by powder metallurgy process of metal carbide hard phases such as WC, Ti-WC and TiC-TaC(NbC)-WC, and metal Co, Ni, Fe and other binder phases. Hard phase, metal Co as the binder phase of tungsten-cobalt cemented carbide accounted for the largest share. Tungsten-cobalt cemented carbide has the advantages of high hardness, excellent wear resistance, high elastic modulus, good chemical and thermal stability, etc., and occupies an important position in modern tools, wear-resistant, high-temperature and corrosion-resistant materials. It has a wide range of uses. However, both tungsten and cobalt are high-value strategic metal resources. With the mineral resources on the verge of exhaustion, in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/34C22B7/00C22B23/02B22F9/12
CPCB22F9/12C01P2002/72C01P2004/03C01P2004/61C01P2006/80C22B7/001C22B23/02Y02P10/20
Inventor 夏侯斌
Owner GANZHOU HUAXIN METAL MATERIAL CO LTD
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