Method for extracting, separating and recycling tungsten carbide and cobalt in waste hard alloy by melt

A technology of separation and recovery of cemented carbide, which is applied in the direction of carbides, tungsten/molybdenum carbides, and reduction of gas emissions. It can solve the problems of low-grade recycled alloys, high iron and oxygen content, and easy to cause fouling, etc., to achieve The scale can be large or small, the cobalt recovery rate is high, and the effect of wide application

Active Publication Date: 2020-10-16
CENT SOUTH UNIV
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  • Abstract
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Problems solved by technology

[0003] 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. However, 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, need related hydro-smelting plants, low-grade recycled alloys and many other issues

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  • Method for extracting, separating and recycling tungsten carbide and cobalt in waste hard alloy by melt

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Embodiment 1

[0043] In this embodiment, the recovery process for extracting cobalt from the waste tungsten-cobalt cemented carbide with a Co content of 5% comprises the following steps:

[0044] (1) Clean the waste tungsten-cobalt cemented carbide material with tungsten-cobalt cemented carbide cleaning agent solution and clear water, dry to obtain clean tungsten-cobalt cemented carbide material, take 900.0g of clean tungsten-cobalt cemented carbide material after cleaning, extract medium Zn -Mg binary alloy 2700.0g, the mole percentages of Zn and Mg in the Mg-Zn binary alloy are 50% and 50% respectively. The clean tungsten-cobalt cemented carbide is placed in a porous and liftable titanium mesh, the extraction medium is placed in a graphite crucible, and then the graphite crucible and the titanium mesh are placed together in a well-type resistance vacuum furnace, and argon gas is introduced into the furnace. The flow rate is 100mL / min, start the heating system, raise the temperature to 900...

Embodiment 2

[0048] In this embodiment, the process of separating and recovering tungsten carbide and metal cobalt from waste tungsten-cobalt cemented carbide with a Co content of 10% comprises the following steps:

[0049] (1) Clean the waste tungsten-cobalt cemented carbide material with tungsten-cobalt cemented carbide cleaning agent solution and clear water, and dry to obtain a clean tungsten-cobalt cemented carbide material. Take 1000.0 g of the cleaned tungsten-cobalt cemented carbide material, extract medium Zn - 5000.0 g of Pb binary alloy, and the molar percentages of Zn and Pb in the Zn-Pb binary alloy are 70% and 30% respectively. The clean tungsten-cobalt cemented carbide is placed in a porous and liftable titanium mesh, the extraction medium is placed in a quartz crucible, and then the quartz crucible and the titanium mesh are placed together in a well-type resistance vacuum furnace, and hexafluoride is introduced into the furnace Sulfur gas, with a flow rate of 150mL / min, sta...

Embodiment 3

[0053] The present embodiment is the recovery process that extracts cobalt from the waste tungsten-cobalt cemented carbide that the content of Co is 15%, comprises the following steps:

[0054] (1) Clean the waste tungsten-cobalt cemented carbide material with tungsten-cobalt cemented carbide cleaning agent solution and clear water, dry to obtain clean tungsten-cobalt cemented carbide material, take 900.0g of clean tungsten-cobalt cemented carbide material after cleaning, extract medium Zn -Sn alloy 7200.0g, the molar percentages of Zn and Sn in the Zn-Sn alloy are 60% and 40% respectively, the clean tungsten-cobalt cemented carbide is placed in a porous and liftable titanium mesh, and the extraction medium is placed in a magnesium oxide crucible Then put the magnesia crucible and titanium mesh together into the well-type resistance vacuum furnace, and argon gas was introduced into the furnace at a flow rate of 150mL / min. The heating system was started and the temperature was r...

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Abstract

The invention discloses a method for extracting, separating and recovering tungsten carbide and cobalt in waste hard alloy by melt. The method comprises the following steps that S1, extracting treatment is carried out by using molten Zn-M alloy as an extraction medium and waste tungsten-cobalt hard alloy as a to-be-extracted substance to obtain eutectic melt and alloy residue, Zn in the Zn-M alloyis a base metal, m is one or more of Mg, Pb, Bi or Sn; and S2, the eutectic obtained in the S1 is subjected to vacuum distillation, and metal cobalt powder and a condensed extraction medium are obtained. The method for separating and recycling tungsten carbide and metal cobalt in the waste tungsten-cobalt hard alloy is clean and efficient, and the method has the advantages of short process flow,simple equipment, high cobalt recovery rate, low cost, recyclable extraction medium and clean and environment-friendly process.

Description

technical field [0001] The invention relates to the technical field of recycling waste tungsten alloys, in particular to a method for separating and recycling tungsten carbide and metal cobalt in 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. It occupies an important position in the wear-resistant, high-temperature, and corrosion-resistant materials of modern tools, and is very useful. widely. However, both tungsten and cobalt are high-value strategic metal resources. As the mineral resources are on the verge o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B23/02C01B32/949
CPCC22B7/001C22B23/02C01B32/949Y02P10/20Y02P10/146
Inventor 郭学益甘向栋崔富晖田庆华于大伟张纯熹
Owner CENT SOUTH UNIV
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