Title:
【発明の名称】希土類元素の分離方法
Document Type and Number:
Japanese Patent JP2756794
Kind Code:
B2
Abstract:
PURPOSE:To simply separate and recover each rare earth element and Y with good accuracy by bringing the rare earth element salt water solution into contact with extracting agent, stripping middle rare earth elements from the extracting agent, successively stripping heavy rare earth elements and Y and further, extracting the heavy rare earth elements. CONSTITUTION:The water solution of the rare earth element salts is brought into contact with the acidic phosphoric series extracting agent. By this method, Sm, Eu, Gd, Tb (middle rare earth elements) Dy, Ho, Er, Tm, Yb, Lu (heavy rare earth elements) and Y are extracted and while remaining La, Ce, Pr, Nd (light rare earth elements) in the water solution, they are separated and recovered. Successively, by back-extracting the middle rare earth elements from the above extracting agent with dilute mineral acid water solution, they are separated and recovered. Further, the heavy rare earth elements and Y are back-extracted from the extracting agent with the mineral acid water solution. This mineral acid water solution is adjusted for pH, and from this, the heavy rare earth elements are extracted with ternary saturated fatty acid series extracting agent, and while remaining Y in the water solution, they are separated and recovered. After that, by back-extracting the heavy rare earth elements from the above extracting agent with the mineral acid water solution, they are separated and recovered. By this method, each rare earth element and Y are continuously separated with good accuracy in a short time and the separation of the single element sat the next process is facilitated.
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Inventors:
DEGUCHI TOSHIMITSU
KUDO HIROYUKI
OGURA HIROSHI
TAKAHASHI SEIJI
KOJIMA NOBORU
KUDO HIROYUKI
OGURA HIROSHI
TAKAHASHI SEIJI
KOJIMA NOBORU
Application Number:
JP23185488A
Publication Date:
May 25, 1998
Filing Date:
September 16, 1988
Export Citation:
Assignee:
NIPPON JUKAGAKU KOGYO KK
International Classes:
C22B59/00; C22B3/20; C22B3/38; (IPC1-7): C22B59/00; C22B3/20
Attorney, Agent or Firm:
Rikichi Ichikawa