Title: Direct extn. of fluorescent grade europium oxide
Application Number: 85104034 Application Date: 1985.05.21
Publication Number: 1005094 Publication Date: 1986.11.19
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: B01D11/04,C22B59/00
Applicant(s) Name: Baotou Rare Earth Elements Research Inst., Ministr Address:
Inventor(s) Name: Ji Zhengke, Leng Zhongyi, Li Shuhe, Wang Qi, Wang
Attorney & Agent:
Abstract:
     The enriched europium and gadolinium raw material is directly extn. in Hcl medium by two step-multistage sepn. without any reducing agent. The preferred extracting agent is aminated 2-ethylhexyl-mono-2-ethylhevyl phosphate (P507). The yield is higher than 95%, the quality of europium oxide meets the specification of fluorescent grade product and the gadolinium has a purity of 99%. This method shows following advantages: continuous operation, simple equipment and low consumption of chemicals. Red powder made from this fluorescent grade europium oxide is of a quality suitable for producing color kinolamps in television.
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