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附图的简单说明图1是用连续排列的5个萃取器(理论级数5级)进行对流萃取提纯钇时表示料液、溶剂、洗涤液、杂质及纯钇的流向示意图。发明的详细说明最近彩色电视、通讯、电灯等用的高纯氧化钇的需要在显著增加,钇同稀土元素是一起提职的,因此稀土作为杂质,必须从钇中分离出去。然而稀土和钇的化学性质很类似,分离
Brief Description of the Drawings Fig. 1 is a schematic diagram showing the flow of feed liquid, solvent, washing liquid, impurities and pure yttrium by convective extraction and purification of yttrium with five consecutive extractors (theoretical stage 5). Detailed Description of the Invention Recently, the demand for high-purity yttrium oxide for use in color television sets, telecommunications, electric lamps and the like has increased significantly. Yttrium is put on the job with rare earth elements. Therefore, rare earths as impurities must be separated from yttrium. However, the chemical properties of rare earth and yttrium are very similar and isolated