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Method for recovering waste hard alloy

A technology of cemented carbide and dielectric, applied in the field of metallurgy, to achieve the effect of short process flow and environmental friendliness

Active Publication Date: 2014-09-03
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the method of directly using waste cemented carbide as the anode and recovering nano-tungsten powder at the cathode by molten salt electrolysis has not been reported yet.

Method used

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  • Method for recovering waste hard alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The method for preparing nano-tungsten powder by recycling waste cemented carbide by molten salt electrolysis: the electrolytic cell is protected by 10% oxygen + argon (volume ratio) gas. The composition of the molten salt system is NaCl-52mol% CaCl 2 , the electrolysis temperature is 750°C, the metal titanium plate is used as the cathode, the YG6 type waste cemented carbide is used as the anode material, the pole distance is 3cm, the electrolysis voltage is controlled, the cell voltage is controlled at 3.2V, and the cell current is stable at 1.3A during the electrolysis process , with the consumption of anode material, the cell current increases. Electrolysis for 8 hours. The metal powder and molten salt medium obtained by electrolysis are separated and collected from the molten salt medium and the product powder by pickling, washing, filtering and vacuum drying. The vacuum degree is 0.5MPa, and the drying temperature is 50°C.

[0048] The purity of the tungsten met...

Embodiment 2

[0050] A method of using molten salt electrolysis to treat waste WC cemented carbide to directly recover WC powder powder: the electrolytic cell is protected by argon gas. The composition of the molten salt system is NaCl-50mol% KCl, the electrolysis temperature is 750°C, graphite carbon is used as the cathode, WC is the anode material, the pole distance is 3cm, the electrolysis current is controlled, and the electrolysis current density is controlled at 0.3A / cm 2 , The tank voltage is stable at 2.2V during the electrolysis process. The metal powder and molten salt medium obtained by electrolysis are separated and collected from the molten salt medium and product powder by pickling, water washing, filtration and vacuum drying. The vacuum degree is 0.5MPa, and the drying temperature is 50°C.

[0051] The WC powder particles were obtained by electrolysis, and its purity reached 99.1wt%. The XRD patterns and FESEM photos of the products are shown in Figure 4 , Figure 5 .

Embodiment 3

[0053] A method for directly preparing tungsten-cobalt alloy powder by using molten salt electrolysis of waste cemented carbide: the electrolytic tank is protected by a mixed gas of 20% oxygen and argon. The composition of the molten salt system is NaCl-50mol% Na 2 WO 4 -26mol% CaCl 2 , the electrolysis temperature is 750°C, the metal titanium plate is used as the cathode, the YG16 waste cemented carbide is used as the anode material, the pole distance is 3cm, the electrolysis current is controlled, and the electrolysis current density is controlled at 0.5A / cm 2 , The tank voltage is stable at 2.9V during the electrolysis process. Electrolysis to obtain W-Co composite powder particles. The metal powder and molten salt medium obtained by electrolysis are separated and collected from the molten salt medium and product powder by pickling, water washing, filtration and vacuum drying. The vacuum degree is 0.5MPa, and the drying temperature is 40°C.

[0054] The XRD patterns an...

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Abstract

The invention provides a method for recovering waste hard alloy. According to the method, the waste hard alloy is used as an anode to directly perform electrolysis in a fused salt. The method comprises the following steps: 1) carrying out vacuum dehydration by using a fused salt dielectric; 2) by using the waste hard alloy as the anode and an inert electrode as the cathode, electrolyzing in the molten fused salt dielectric at 350-1000 DEG C; and 3) separating and collecting the metal powder and fused salt dielectric after electrolysis. According to the technical scheme, tungsten and cobalt ions can be directly dissolved out of the anode material-waste hard alloy to enter the fused salt dielectric, and deposit on the cathode plate under the driving action of the electrolysis voltage, thereby obtaining the metal powder granules. The tungsten, cobalt and other product materials obtained by electrolysis can be used as hard alloy materials, high-temperature structure materials, weapon materials, photocatalytic materials and the like, and are applicable to the fields of production processing, aerospace, war industry, environmental energy sources and the like. The method has the advantages of short technical process, no discharge of solid / liquid / gas waste and environment friendliness.

Description

technical field [0001] The invention belongs to the field of metallurgy, in particular to a method for recovering metal from waste cemented carbide. Background technique [0002] Cemented carbide is a powder metallurgy product made of tungsten carbide powder as the main component, cobalt or nickel as the binder, and sintered in a vacuum furnace or a hydrogen reduction furnace. [0003] There is a shortage of cobalt resources in my country, and a large amount of imports are required every year. Although tungsten resources are relatively abundant, with the increase in output in recent years, the reserves and recoverable quantities are decreasing day by day. The tungsten content of waste cemented carbide can reach 40% to 95%, which is much higher than the tungsten content of APT, the raw material for cemented carbide production, and has very high utilization value. Therefore, the recycling of waste cemented carbide is of great significance to the rational use and protection of...

Claims

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Application Information

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IPC IPC(8): C25C5/04
CPCC25C3/34C25C7/005
Inventor 聂祚仁席晓丽王娜张力文司冠豪马立文
Owner BEIJING UNIV OF TECH
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