Recovery method for waste hard alloy and application

Abstract

The invention discloses a recovery method for a waste hard alloy. The recovery method comprises the following steps: subjecting a recovered waste hard alloy to high temperature treatment at a temperature of 1600 to 2200 DEG C for 2 to 5 h; and crushing the waste hard alloy having undergone high temperature treatment into alloy powder with fineness of 160 meshes to 200 meshes. The alloy powder is applied to preparation of a coarse-grain hard alloy. Compared with the prior art, the recovery method for the waste hard alloy in the invention has the advantages of short process flow, simple matching of equipment, easy and practicable operation, a long service life of equipment, small energy consumption and loss, appropriate and stable production power, capacity of recovering waste hard alloys with different grain sizes, a wide application scope and a high recovery rate of the waste hard alloy; a regenerated alloy prepared from the alloy powder obtained by using the method has good quality and has performance and effects identical to, or even better than, those of normal coarse-grain hard alloys. The method provided by the invention is an effective, easy and practicable regeneration and recovery method for waste hard alloys and has great market values and economic values.

Description

technical field [0001] The invention relates to a method for recovering waste hard alloys to prepare regenerated coarse-grained hard alloys, belonging to the technical field of powder metallurgy. Background technique [0002] The commonly used cemented carbide is tungsten-cobalt cemented carbide, which is a composite material obtained by using tungsten carbide as raw material and metal cobalt as binder. Since refractory metal tungsten and rare metal cobalt are recognized as extremely Important strategic elements, the price is higher, so the economic value and manufacturing cost of cemented carbide are higher. There are many varieties of tungsten-cobalt cemented carbide, which can be divided into three types: fine-grained, medium-grained and coarse-grained alloys according to their WC grain size. Grain cemented carbide 1.0-2.0μm, coarse grain cemented carbide 2.0-4.0μm. [0003] With the continuous development of the economy, the amount of scrapped hard alloys is constantly...

AI Technical Summary

Problems solved by technology

The existing recovery and reuse methods of cemented carbide mainly include high temperature treatment method, mechanical crushing method, zinc melting method, electric melting method, etc., each method has its own advantages and disadvantages, and has not been effectively and deeply utilized.

The mechanical crushing method is easy to mix impurities, and the zinc melting method is not easy to completely remove the residual zinc. The electrofusion method has high requirements on the quality of scrap alloys, requiring a cobalt content greater than 10%, but the high temperature treatment method does not have the disadvantages of the above three methods. It is to treat waste cemented carbide at a temperature higher than the sintering temperature of the alloy, so that the alloy structure can be disintegrated, and after crushing and grinding, the recycled alloy with the same structure as the normal alloy can be obtained

However, for the technology of recycling cemented carbide by high temperature treatment, technicians have not carried out more detailed and in-depth research, and have not clarified the parameter ranges of each stage in the high temperature treatment process, resulting in uneven quality of the recycled alloy obtained. At the same time, in order to make the alloy The structure can be completely and effectively dismantled, and the technicians blindly increase the processing temperature, which not only reduces the service life of the equipment, but also reduces the recycling rate of the alloy and increases the loss of energy consumption

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