METHOD FOR RECOVERING TUNGSTEN FROM WASTED SLUDGE

• Main Author: JANG, HAN GYU
• Format: Patent
• Language: English
• Published: 18.12.2008
• Subjects: CASTING; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; FERROUS OR NON-FERROUS ALLOYS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; METALLURGY; PERFORMING OPERATIONS; POWDER METALLURGY; 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; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WORKING METALLIC POWDER

An economical manufacture process where calcinations is unnecessary tries to be provided react with the inorganic acid and valuable metal(co, and Ti and Ni) included in the sludge are eluted and the high purity tungsten powder is collected. A method for recovering the highly purified tungsten powder from the sludge performs a step drying the sludge containing the tungsten and gets the dry powder; a impurity removal step for removing impurity from the dry powder; and an acid processing step for separating the tungsten from the other component by using the inorganic acid, the powder removing impurity through the impurity removal stage is undergone an acid process.