FINE PARTICLE RECOVERY METHOD FOR VALVE METAL POWDER

• Main Author: IIJIMA HITOSHI
• Format: Patent
• Language: English
• Published: 05.08.2010
• Subjects: BASIC ELECTRIC ELEMENTS; CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES ORLIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE; CASTING; CHEMISTRY; ELECTRICITY; 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

PROBLEM TO BE SOLVED: To provide tantalum powder consisting of tantalum particles of small primary particle size. SOLUTION: The process and system for producing tantalum or other valve metal particles comprise forming tantalum particles in a reduction process carried out in a reactor vessel 201, and using a siphon 209 to transfer fine tantalum particles out of the reaction mixture to a recovery vessel 223. This particle transfer can occur while the reaction mixture is agitated. The tantalum particles can be automatically withdrawn when the reaction mixture has a depth level greater than the fluid level 229 of the tantalum fine particle recovery vessel, and outflow automatically stops when the fluid levels of the reactor and particle recover vessel equilibrate. Tantalum or other valve metal powders made by the processes, and capacitors made with valve metal powders are also provided. COPYRIGHT: (C)2010,JPO&INPIT