Title: Process for treatment of rare earth metals ores
Application Number: 86105892 Application Date: 1986.09.09
Publication Number: 1009533 Publication Date: 1987.03.18
Approval Pub. Date: 1993.03.03 Granted Pub. Date: 1993.03.03
International Classifi-cation: C01F17/00;C22B3/00;C22B59/00
Applicant(s) Name: Rhone-Poulenc Specialites Chimiques Address:
Inventor(s) Name: Claude Magnier;Frederic Fabre;Jean Paul Tognet
Attorney & Agent: WU DAJIAN QUAN JING
Abstract:
    Rare earth hydroxides are recovered from the rare earth ores, by treating the ore with an aqueous solution of an alkali metal hydroxide, under agitation and essentially constant pressure, at a temperature of from about 100 DEG to 220 DEG C, and wherein the ratio by weight of alkali metal hydroxide/ore ranges from a weight ratio of sodium hydroxide/ore of from about 1 to 0.5, or a weight ratio of potassium hydroxide/ore of from about 1.4 to 0.7.
Time: 5