The super coarse tungsten powder is the main raw material for the production of coarse grain cemented carbide, and its downstream products are widely used in mining tools, stamping dies, oil drilling and hard surface materials and so on.

At present, the cemented carbide under submicron is prepared by mechanical mixing, chromium powder or chromium carbide is added to the ultrafine tungsten powder, and cemented carbide is prepared by carbonization and pressing sintering after mechanical mixing. The uneven distribution of the added grain growth inhibitors will lead to the abnormal growth of "WC grain", which seriously affects the performance of the cemented carbide and restricts the development of the superfine cemented carbide.

At present, the main equipments for producing tungsten powder are propulsion reduction furnace and rotary reduction furnace. The feeding way of a propelled reduction furnace is to place tungsten oxide in a boat, feed and discharge through the the push rod. The feeding mode of the rotary reduction furnace is to put tungsten oxide into the inlet of the reduction furnace and use its own gravity to flow itself into the furnace tube, which has a high requirement for the fluidity of tungsten oxide.

In order to improve the stability of magnetron launch, carbonization of magnetron made of thorium tungsten wire is required.