METHOD FOR PRODUCING METAL OR METAL COMPOUND COMPRISING PROCESS OF TREATING WITH FLUORINE AND ADJUSTED RAW MATERIAL USED THEREIN

Title:

METHOD FOR PRODUCING METAL OR METAL COMPOUND COMPRISING PROCESS OF TREATING WITH FLUORINE AND ADJUSTED RAW MATERIAL USED THEREIN

Document Type and Number:

WIPO Patent Application WO/2002/022895

Kind Code:

A1

Abstract:

A method for producing a metal or a metal compound, such as niobium or tantalum, from a raw material containing the metal through a process of treating with fluorine using a solution containing hydrofluoric acid, characterized in that an adjusted raw material comprising a raw material of the metal or metal compound and, blended therewith as an additive, a material insoluble in hydrofluoric acid or in a mixed acid containing hydrofluoric acid as an essential component is used in a step dealing with an ore or a concentrate, or alternatively, said insoluble material is added to a solvent in the process of treating with fluorine, to thereby increase the amount of an extraction residue and thus control the ratio of a radioactive material being present in the residue to a desired value. The method can be used for the purpose of preventing the concentration of a radioactive material in an extraction residue by-produced.

Inventors:

SOHAMA YOSHIO (JP)
ISAKA HIROMICHI (JP)
WATANABE HIROYUKI (JP)

Application Number:

PCT/JP2000/008948

Publication Date:

March 21, 2002

Filing Date:

December 18, 2000

Export Citation:

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Assignee:

MITSUI MINING & SMELTING CO (JP)
SOHAMA YOSHIO (JP)
ISAKA HIROMICHI (JP)
WATANABE HIROYUKI (JP)

International Classes:

C22B3/10; C22B3/24; C22B3/26; C22B3/00; C22B34/24; C22B60/02; (IPC1-7): C22B3/00; C22B34/24; C22B60/02

Foreign References:

JPS5757850A	1982-04-07
JPS6426199A	1989-01-27
JPS4838320B1	1973-11-16
US4349513A	1982-09-14
JPS55113630A	1980-09-02

Other References: