High-temperature treatment to recover tungsten-cobalt method: Super-hard alloy is made by mixing and sintering tungsten, cobalt and carbon powder. The super-hard alloy high-temperature treatment method developed by Japan New Metal Co., Ltd. can recover tungsten-cobalt recycled powder with an annual output of 80 tons.
After the super-hard alloy scraps are washed, the heat treatment is performed in an inert gas at a high temperature of 1800 to 2300 ° C, and the cobalt in the super-hard alloy is in a sponge state which is easy to be powdered. At the heat treatment temperature, the cobalt in the super-hard alloy is not in a sponge state below 1800 °C, and the tungsten carbide in the alloy above 2300 °C will decompose and form a third phase, and the result is not good.
The heat-treated lumps were coarsely crushed to 850 μm by a jaw crusher or a drum crusher, and then finely pulverized into a regenerated powder. The regenerated powder obtained by this method tends to grow easily during sintering due to the coarse particle formation process. There is almost no change in the cobalt content and carbon content after treatment, and only the amount of impurities iron and silicon increases, which has no effect on the manufacture of cemented carbide. The particle size of the regenerated powder may be finely pulverized to 1 μm or less depending on the pulverization conditions.
This method uses a relatively easy process, does not damage the original composition of the super-hard alloy, any type of super-hard alloy can reproduce a certain size of powder, without special equipment, is an economic recovery method. Compared with the previous method of reusing and refining chemical reagents, it has great advantages.
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