METHOD FOR REGENERATING CEMENTED CARBIDE

PROBLEM TO BE SOLVED: To recover a raw material powder and a binding material from cemented carbide scrap and regenerated them and particularly to provide a method for regenerating cemented carbide, capable of regenerating a raw material powder of tungsten carbide, etc., into a state free from grain growth and impurity contamination so that it can be reclaimed in the state as a raw material powder for cemented carbide. SOLUTION: In this method of regenerating cemented carbide, a heat resistant pressure container is filled with cemented carbide together with acidic aqueous solution and hydrothermal treatment is performed to dissolve a binding material contained in the cement carbide in the acidic aqueous solution and recover the binding material. Further, a heat resistant pressure container is filled with cemented carbide together with acidic aqueous solution and hydrothermal treatment is performed to dissolve the binding material contained in the cemented carbide in the acidic aqueous solution and remove the binding material, and then, the resultant residual carbide is heated under a nonoxidizing atmosphere, cooled rapidly, and further crushed and reduced to powder, by which the resultant powder is recovered as a raw material powder for cemented carbide.