It is known that tungsten cemented carbide is composed by super-hard particles (WC, TiC, VC, etc) and binder metals (Co, Ni, Fe, etc). In the Zn-distillation process, melt Zn dissolves the binder metals so that the hard particles could fall apart easily. After Zn is evaporated at elevated temperatures, binder metals precipitates on the surface of hard particles. The distillated alloy is milled into fine powders finally.
One of the advantages of Zn-distillation process is that the reclaimed tungsten cemented carbide powders have the same chemical composition as raw materials. Besides, it is an economical and environment-friendly process which does not generate any wastes and pollution.