Recovery processing method of hard alloy scraps

A technology of cemented carbide and recycling method, which is applied in the recycling application field of waste cemented carbide, can solve the problems of unstable quality of recycled cemented carbide, low impurity content of cemented carbide powder, complicated equipment, etc., and achieves reduction of intragranular defects. , The effect of small environmental pollution and short process

Inactive Publication Date: 2009-09-09
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the technical problems such as complex equipment, high energy consumption, and unstable quality of regenerated cemented carbide in the above-mentioned waste cemented carbide treatment and recovery method, and provide a new wast

Method used

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  • Recovery processing method of hard alloy scraps
  • Recovery processing method of hard alloy scraps
  • Recovery processing method of hard alloy scraps

Examples

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Example Embodiment

[0014] Example 1: Put 5 kg of waste cemented carbide, using carbon black as a filler, into a graphite boat, so that the carbon black covers the waste cemented carbide. Then put the graphite boat into a carbon tube furnace with hydrogen as the protective gas for high-temperature calcination. The calcination temperature is 1630~1700°C, the calcination holding time is 30 minutes, and the hydrogen flow rate is 1.3m. 3 / h. After the calcination is completed, it is discharged from the furnace and the boat is discharged, and after cooling to room temperature, the surface of the waste alloy is cleaned, and then mechanically crushed by a jaw crusher and a counter-roll crusher to crush the waste alloy into alloy particles with a particle size of 2-8mm . The mechanically crushed 2-8mm alloy particles are loaded into a ball mill for grinding, with a ball-to-material ratio of 5:1, and the ball milling time is 16 hours. The alloy powder obtained after ball milling is unloaded and sieved to remo...

Example Embodiment

[0015] Example 2: Using 8kg waste cemented carbide for high-temperature calcination, the calcination temperature is 2000-2100°C, the calcination holding time is 50 minutes, and the hydrogen flow rate is 1.8m 3 / h. The alloy particles have a ball-to-material ratio of 4.5:1 and a ball-milling time of 11 hours (other process steps, equipment conditions, and control parameters are the same as in Example 1). The qualified alloy powder has a free carbon content of 0.18% and an iron content of 0.28%. The alloy powder is clean and free of inclusions. The qualified recycled alloy powder is calculated according to the chemical composition requirements of the required cemented carbide grades, and then the traditional cemented carbide production process is used to produce cemented carbide products for mining or other purposes.

Example Embodiment

[0016] Example 3: Use 10kg of waste cemented carbide for high temperature calcination, the calcination temperature is 2300-2400℃, the calcination holding time is 80 minutes, and the hydrogen flow rate is 2.5m 3 / h. The ball-to-material ratio of the alloy particle ball milling is 4:1, and the ball milling time is 8 hours (other process steps, equipment conditions, and control parameters are the same as in Example 1). The qualified alloy powder has a free carbon content of 0.17% and an iron content of 0.25%. The alloy powder is clean and free of inclusions. The qualified recycled alloy powder is calculated according to the chemical composition requirements of the required cemented carbide grades, and then the traditional cemented carbide production process is used to produce cemented carbide products for mining or other purposes.

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Abstract

The invention discloses a recovery processing method of hard alloy scraps. The method comprises the following steps: a. the hard alloy scraps and a filling agent of charcoal black are put into a graphite boat and put into a carbon tube furnace to be calcined under hydrogen at a high temperature, the calcining temperature is from 1600 DEG C to 2400 DEG C, the calcining time is from 30 min to 80 min, and the hydrogen amount is 1.2 to 2.6m<3>/h; b. the hard alloy scraps after being calcined at the high temperature are unloaded from the boat, cleaned on the surfaces, crushed at two stages by a jaw crusher and a roller crusher into alloy granules with the granularity of 2 mm to 8 mm; c. ball milling is carried out to the alloy granules after being crushed, the ratio of grinding media to material is (4 to 5):1, and the ball milling time is from 8 hours to 16 hours; d. alloy powder which is obtained after ball milling is screened, and the screened alloy powder which is detected to be qualified is used for mixing by a traditional production technology and manufacturing a hard alloy. The method adopts high-temperature calcination so that the hard alloy scraps are extremely easy to crush and process, and the recovered alloy powder has the same ingredients as the tungsten carbide of the processed hard alloy scraps and a binding metal.

Description

technical field [0001] The invention relates to the regeneration application of waste hard alloy, especially the treatment and recovery method of waste hard alloy. Background technique [0002] Cemented carbide has the advantages of high hardness, wear resistance and elastic modulus, and is widely used in modern tool materials, wear-resistant materials, high-temperature-resistant and corrosion-resistant materials, etc. Tungsten and cobalt, the main raw materials for the preparation of cemented carbide, are rare metals with high prices and very few mineral reserves. Therefore, how to recycle waste cemented carbide products that can no longer be used in production and reuse them as raw materials for preparing cemented carbide Raw materials have always been highly valued. At present, the processing and recycling methods of waste cemented carbide widely used in China are mainly mechanical crushing method, zinc melting method and electrolytic method. However, these methods all ...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C29/06
Inventor 邹德良沈佳张重彦陈小卫张汝南
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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