RECYCLING METHOD OF TUNGSTEN CARBIDE FROM WASTE CEMENTED CARBIDE USING PRESSURED ZINC MELT

PURPOSE: A method for recycling tungsten carbide from waste cemented carbide by using pressurized molten zinc is provided to facilitate reaction between cobalt and zinc by sealing a crucible with a cover to increase the pressure of the crucible. CONSTITUTION: A method for recycling tungsten carbide...

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Bibliographische Detailangaben
Hauptverfasser:	KIM, KYUNG JA, CHO, WOO SEOK, PEE, JAE HWAN, SEONG, NAM EUI, YUN, JIN SOON
Format:	Patent
Sprache:	eng ; kor
Schlagworte:	ALLOYS CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F COMPOUNDS THEREOF FERROUS OR NON-FERROUS ALLOYS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS INORGANIC CHEMISTRY METALLURGY NON-METALLIC ELEMENTS PRETREATMENT OF RAW MATERIALS PRODUCTION AND REFINING OF METALS TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	PURPOSE: A method for recycling tungsten carbide from waste cemented carbide by using pressurized molten zinc is provided to facilitate reaction between cobalt and zinc by sealing a crucible with a cover to increase the pressure of the crucible. CONSTITUTION: A method for recycling tungsten carbide from waste cemented carbide by using pressurized molten zinc is as follows. A crucible(120) containing waste cemented carbide and zinc is loaded into a chamber(110) of an electric furnace(100), wherein the crucible is sealed to restrict the evaporation of zinc. The chamber is heated to a temperature which is higher than the melting point of zinc and lower than the boiling point of zinc. Zinc reacts with cobalt of waste cemented carbide so that cobalt-zinc melt is formed and tungsten carbide is settled down on the bottom of the crucible. The crucible is tilted and the liquid cobalt-zinc is poured out. The chamber is heated to a temperature which is higher than the boiling point of zinc and lower than the melting point of tungsten carbide, thereby volatilizing zinc component. Tungsten carbide-cobalt chamber, obtained by cooling the chamber, is pulverized. The tungsten carbide-cobalt powder is processed with a phosphate solution to remove the residual zinc.