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A recovery process for tungsten-cobalt cemented carbide

A cemented carbide, tungsten-cobalt technology, applied in the field of cemented carbide, can solve the problems of poor crushing effect, impurity pollution in the recycling process of tungsten-cobalt cemented carbide, etc., and achieve the effect of simple process

Inactive Publication Date: 2011-12-28
浙江锐利硬质合金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] For this reason, the technical problem to be solved by the present invention lies in the problems of impurity pollution and poor crushing effect in the recovery process of tungsten-cobalt cemented carbide in the prior art, and then provide a tungsten-cobalt carbide with no impurity pollution and good crushing effect. Carbide Recycling Process

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  • A recovery process for tungsten-cobalt cemented carbide
  • A recovery process for tungsten-cobalt cemented carbide
  • A recovery process for tungsten-cobalt cemented carbide

Examples

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Embodiment 1

[0035] The recycling process applicable to cemented carbide described in this embodiment comprises the following steps:

[0036] (1) Clean the waste cemented carbide to remove impurities such as copper, iron, silicon, phosphorus and oil on the surface;

[0037] (2) Heat the cleaned waste cemented carbide to above 800°C, and immediately transfer it to a closed vacuum cryogenic chamber, and at the same time pass through a liquid inert cold medium below -150°C to rapidly cool the alloy to -20°C , the waste cemented carbide can be broken into fragments with a particle size of 8-10mm;

[0038] (3) Mechanically grind and pulverize the broken pieces obtained in step (2) to a powder with a particle size of 4-8 μm to obtain the required cemented carbide powder.

[0039]The cemented carbide powder prepared by the process described in this example can be used again to process and prepare cemented carbide coal cutting teeth after testing its specific composition and content, and the proc...

Embodiment 2

[0044] The recovery process for tungsten-cobalt cemented carbide with a cobalt content lower than 10% described in this embodiment includes the following steps:

[0045] (1) Clean the waste cemented carbide with 20 KHz ultrasonic waves at 40°C and use phosphate solution as the medium to remove impurities such as copper, iron, silicon, phosphorus and oil on the surface;

[0046] (2) Dry the cleaned waste cemented carbide, and heat it to 800-900°C with nitrogen gas as a protective gas, and immediately transfer it to a closed vacuum cryogenic chamber, and at the same time pass through a liquid inert cryogenic chamber below -150°C. Medium, so that the alloy is rapidly cooled to -20°C, and the waste cemented carbide can be broken into fragments with a particle size of 8-10mm under the stress change under a strong temperature difference;

[0047] (3) Put the broken pieces obtained in step (2) into a ball mill for grinding and crushing, and add alcohol as a dispersion medium to help ...

Embodiment 3

[0053] The process described in this embodiment is applicable to the recovery process of tungsten-cobalt cemented carbide, including the following steps:

[0054] (1) Use 40 KHz ultrasonic waves to clean the waste cemented carbide at room temperature with disodium hydrogen phosphate solution as the medium to remove impurities such as copper, iron, silicon, phosphorus and oil on the surface;

[0055] (2) Dry the cleaned waste cemented carbide, and heat it to 900-1000°C with nitrogen as a protective gas, and immediately transfer it to a closed vacuum cryogenic chamber, and at the same time pass through a liquid inert cold chamber below -150°C. Medium, so that the alloy is rapidly cooled to -20°C, and the waste cemented carbide can be broken into fragments with a particle size of 8-10mm under the stress change under a strong temperature difference;

[0056] (3) Put the broken pieces obtained in step (2) into a hexagonal ball mill for grinding and crushing, and add hexane as a dis...

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Abstract

The invention belongs to the technical field of hard alloys, and in particular relates to a process for recycling waste tungsten-cobalt hard alloys. In the recovery process of the present invention, (1) cleaning the waste cemented carbide; (2) heating the cleaned waste cemented carbide to above 800°C, and immediately transferring it into a vacuum airtight container, and at the same time passing it into -150 Cool down the liquid inert cold medium below ℃, and the waste cemented carbide is broken into fragments; (3) Grinding and pulverizing the crushed fragments into a powder with a particle size of 2-8 μm to obtain the required cemented carbide alloy powder. The recovery process of the present invention utilizes the stress change difference caused by the rapid temperature difference to force the hard alloy to overcome its own strength and break into small particle size fragments, and because the low temperature of liquid nitrogen can reach -180°C, the hard alloy is forced to The high-quality alloy is broken into fragments with smaller particle sizes, and the step of grinding and crushing with smaller particle sizes can be directly carried out without secondary mechanical crushing, and the process is simple.

Description

technical field [0001] The invention belongs to the technical field of hard alloys, and in particular relates to a process for recycling waste tungsten-cobalt hard alloys. Background technique [0002] Since the advent of cemented carbide, the issue of recycling has been concerned by the industry. Since cemented carbide is generally made of tungsten carbide and rare metal cobalt as the main raw materials, its economic value and manufacturing cost are relatively high, and the recovery of tungsten and cobalt is a very valuable recycling field. Because cemented carbide is very hard, it is difficult to be dissolved by some inorganic acids and alkalis at room temperature, so there are many difficulties in how to recycle waste cemented carbide technology. Due to the powder metallurgy structure formed by the sintering of the hard phase tungsten carbide and the binder cobalt at a certain temperature, in all recycling processes, how to decompose the dense and hard alloy structure an...

Claims

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Application Information

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IPC IPC(8): B22F9/04C22B7/00
CPCY02P10/20
Inventor 董伟应泽荣
Owner 浙江锐利硬质合金有限公司
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