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    • 2. 发明申请
    • SEPARATION METHOD OF TELLURIUM AND SELENIUM, AND PREPARATION METHOD OF TELLURIUM USING THE SAME
    • 碲和硒的分离方法及使用其的氧化锆的制备方法
    • US20150151966A1
    • 2015-06-04
    • US14541799
    • 2014-11-14
    • KOREA INSTITUTE OF SCIENCE AND TECHNOLOGYRECYTEC INC.
    • Hwa Young LEEJoong Kee LEEJae Gyu JEEJoon Chul CHOI
    • C01B19/00C07C51/42
    • C01B19/001C01B19/005C07C51/412C07C51/48Y02P20/129C07C55/07
    • The present invention relates to a method of separating tellurium (Te) and selenium (Se) by using a neutral extractant (for example, either one of TBP and TEHP, or in combination thereof) from a dissolved solution of tellurium, such as a waste thermoelectric material. When tellurium and selenium are separated by using the method of this invention from a dissolved solution in which a Bi2Te3-based waste thermoelectric material is dissolved, a recovery rate of 97% or more and a separation factor of 400 or more for tellurium may be achieved, and therefore, tellurium and selenium may be separated in a very effective and economic manner as compared to conventional methods. Further, the present invention is characterized in that environmental pollution issues may be significantly reduced as compared with conventional methods carried out in a strong acidic solution since the present separation and extraction is conducted under a relative weak acid atmosphere in a pH range of 1.0 to 1.5.
    • 本发明涉及通过使用中和提取剂(例如,TBP和TEHP中的任一种或其组合)从碲的溶解溶液(例如废物)分离碲(Te)和硒(Se)的方法 热电材料。 当使用本发明的方法从溶解有Bi 2 Te 3的废热电材料的溶解溶液中分离碲和硒时,可以实现97%以上的回收率和碲的分离系数为400以上。 因此,与常规方法相比,碲和硒可以以非常有效和经济的方式分离。 此外,本发明的特征在于,与在强酸性溶液中进行的常规方法相比,可以显着降低环境污染问题,因为在1.0至1.5的pH范围内的相对弱酸性气氛下进行本分离和萃取 。
    • 7. 发明申请
    • SEPARATION METHOD OF ZIRCONIUM AND HAFNIUM BY SOLVENT EXTRACTION PROCESS
    • 通过溶剂萃取方法分离锆和铪的方法
    • US20140219891A1
    • 2014-08-07
    • US13852143
    • 2013-03-28
    • KOREA INSTITUTE OF SCIENCE AND TECHNOLOGYPOSCO M-TECH
    • Hwa Young LEEByung Won CHOJoong Kee LEE
    • C22B3/26
    • 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。