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    • 4. 发明授权
    • Separation method of zirconium and hafnium by solvent extraction process
    • 通过溶剂萃取法分离锆和铪的方法
    • US08778288B1
    • 2014-07-15
    • US13852143
    • 2013-03-28
    • Korea Institute of Science and TechnologyPosco M-Tech
    • Hwa Young LeeByung Won ChoJoong Kee Lee
    • B01D11/00
    • C22B3/0005Y02P10/234
    • A separation method of zirconium and hafnium is described which includes an extraction process of agitating an undiluted aqueous solution containing zirconium, hafnium, and sulfuric acid with a first stirring solution containing an acidic extractant to produce a first extract solution in which the hafnium is extracted by the acidic extractant; and a recovery process of agitating the first extract solution with a second stirring solution containing a citric acid solution to produce a citric acid solution after extraction in which zirconium is reverse-extracted from the first extract solution to the citric acid solution so as to recover zirconium contained in the first extract solution. The method may reduce the amount of extractant while greatly enhancing the separation effect of zirconium and hafnium, and increase zirconium recovery rate by more than 97% through an additional zirconium recovery process while reducing a hafnium content in zirconium by less than 50 ppm.
    • 描述了锆和铪的分离方法,其包括使用含有酸性萃取剂的第一搅拌溶液搅拌未稀释的含有锆,铪和硫酸的水溶液的提取方法,以产生其中铪被提取的第一提取溶液 酸性提取剂; 以及回收方法,用含有柠檬酸溶液的第二搅拌溶液搅拌第一提取溶液,以在提取后产生柠檬酸溶液,其中将锆从第一提取溶液反萃取至柠檬酸溶液,以回收锆 包含在第一提取物溶液中。 该方法可以减少萃取剂的量,同时大大提高锆和铪的分离效果,并且通过另外的锆回收方法将锆回收率提高97%以上,同时将锆中的铪含量降低到低于50ppm。