METHOD FOR REMOVING CHLORINE FROM METALLIC TITANIUM POWDER

• Main Authors: SHIBATA KIYOSHI, TOKUMITSU NAOKI
• Format: Patent
• Language: English
• Published: 25.12.1991
• Subjects: CASTING; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; METALLURGY; PERFORMING OPERATIONS; POWDER METALLURGY; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WORKING METALLIC POWDER

PURPOSE:To obtain metallic Ti powder usable for powder metallurgy and enabling the production of a metallic Ti ingot having a low Cl content by remelting by bringing powdery metallic Ti into contact with a fluid in a supercritical state in a vessel and dissolving Cl contained in the Ti in the fluid. CONSTITUTION:Powdery metallic Ti is brought into contact with a fluid in a supercritical state in a vessel and Cl contained in the metallic Ti powder is dissolved in the fluid. At this time, a batch process in which both the powder and fluid are sealed in the same vessel and a circulating process in which the fluid is circulated produce the same effect. Water, CO or methanol is desirably used as the fluid in a supercritical state. Metallic Ti having a low Cl content is obtd. and a high purity ingot can be obtd. by remelting the Ti once when the Ti is remelted to produce an ingot.