Title: Extraction for producing fluorescene grade lanthanum oxide
Application Number: 85100148 Application Date: 1985.04.01
Publication Number: 1002114 Publication Date: 1986.08.06
Approval Pub. Date: Granted Pub. Date: 1988.03.09
International Classifi-cation: B01D11/04,C01F17/00
Applicant(s) Name: Qinghua Univ. Address:
Inventor(s) Name: Meng Zhugui, Song Chongli, Xu Jingming, Zhang Wei
Attorney & Agent: ZHANG ZHIDONG YAO GUIFENG
Abstract:
     The extractant is an acidic group of phosphorus P507 or P504. The purificn. is accomplished through fractional extn. and selective back extn.. The mathematical patterns of distribution ratio and sepn. coefft. between lanthanum and actinium extn. are given. The pH values of aq. phase at extract section exit and wash section must be well controlled. The invention is suitable for deep processing of raw lanthanum oxide obtd. from monazite or other rare earth ores, and the fluorescence grade lanthanum oxide is then produced. The economic benefit on industrial application is evident.
Time: 5