Title:
【発明の名称】モナズ石よりトリウムを分離する方法
Document Type and Number:
Japanese Patent JPS5837253
Kind Code:
B2
Abstract:
PURPOSE:To separate Th in high yield by a method wherein fine powder of monazite is dissolved with acid by heating, aq. NH3 or NaOH is added to precipitate hydroxide, the precipitate is dissolved in HCl then treated with ion exchange resin, and HCl of a specified concentration is used for cleaning and elution. CONSTITUTION:Fine powder of monazite contg. ThO2, etc. is dissolved in acid by heating, undissolved residue is filtered out, the filtered solution is added with aq. ammonia or sodium hydroxide to precipitate hydroxide. The precipitate is dissolved in HCl and the concentration of acid is maintained below 4N. The HCl solution is flowed into a cation exchange resin column, the resin column is cleaned with 4N HCl, then Th is eluted by 8-12 N HCl, the eluted solution is added with aq. ammonia to precipitate Th hydroxide. The precipitate is calcined in an electric furnace to separate and recover high-purity thorium oxide in high yield. The process in this method is simpler than the conventional caustic soda method.
Inventors:
HAYASHI HIROSHI
UENO HIROSHI
UENO HIROSHI
Application Number:
JP8060779A
Publication Date:
August 15, 1983
Filing Date:
June 26, 1979
Export Citation:
Assignee:
KOGYO GIJUTSUIN
International Classes:
C22B60/02; C01F15/00; C01G99/00; (IPC1-7): C01F15/00
Attorney, Agent or Firm:
Director, Nagoya Institute of Industrial Technology, AIST