| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a separation method of yttrium for separating a high purity yttrium from a mixed rare earth containing the yttrium by using phenoxy-substituted acetic acid, or alcoholate-substituted acetic acid and dialkylphosphoric acid, or its thio derivative as an extraction solvent. <P>SOLUTION: In the method, alcohol is used as an additive; rare earth chloride or rare earth nitride is used as a slurry; hydrochloric acid or nitric acid of pH 2-4 and 0.5-3 mol/L is used as a washing acid; aqueous ammonia, sodium hydroxide, ammonium bicarbonate or sodium carbonate, etc., are used as a saponification material; a flow rate ratio of an organic phase, the slurry and the washing acid is (5-15) : 1 : (1-6); the number of extraction steps is 20-40; the number of washing steps is 5-20; fractional distillation-extraction-mixing time is 5-10 minutes; clarification time is 10-25 minutes; extraction temperature is 10-35°C; purity of yttrium reaches 99.0-99.996 wt.% and yield is≥95%. <P>COPYRIGHT: (C)2004,JPO</p> |
