Title:
【発明の名称】Ta及び/又はNbを含有する材料からTa及び/又はNbの不純物不含化合物を得るための改良方法
Document Type and Number:
Japanese Patent JPH03502116
Kind Code:
A
Abstract:
The process comprises the following steps: (a) leaching with fluorosilicic acid with a minimal H2?SiF6? concentration of 10% to 40% and greater to which a strong mineral acid, either HCl or H2?SO4?, may be added; (b) separation of Nb and/or Ta from the aqueous acid medium by liquid-liquid extraction using a suitable organic extractant; (c) recovery of the niobium and/or tantalum from the organic phases by re-extraction in aqueous phase followed by precipitation by a base, and subsequent calcination; (d) purification of the tantalum and/or niobium compounds to remove other undesirable elements, in particular silica, by carbochlorination.
Inventors:
Porak, Kristian
Menie, Michel
Preboss, missiel
Menie, Michel
Preboss, missiel
Application Number:
JP50897589A
Publication Date:
May 16, 1991
Filing Date:
August 04, 1989
Export Citation:
Assignee:
Enshichiyu National Dryer
Extra meth
Extra meth
International Classes:
C01G33/00; C01G35/00; C22B3/10; C22B3/26; C22B3/28; C22B3/32; C22B3/38; C22B34/24; (IPC1-7): C22B34/24
Attorney, Agent or Firm:
Mitsuo Adachi (1 outside)