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首页> 外文期刊>Chemical Engineering Communications >Liquid-liquid separation of zirconium and hafnium from nitric liquor in order to obtain nuclear zirconium oxide using TBP as extractant
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Liquid-liquid separation of zirconium and hafnium from nitric liquor in order to obtain nuclear zirconium oxide using TBP as extractant

机译：锆和铪的液液分离，从硝酸液中使用TBP获得核锆氧化物作为萃取剂

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摘要

A specific process to obtain nuclear grade zirconium oxide from a nitric acid liquor is described in this work. The liquor was obtained after alkali fusion and water leaching of a zircon concentrate. The production of nuclear zirconium oxide is possible when tributyl phosphate (TBP) is used as extractant with a high acidity nitric liquor. This study comprises steps: (i) batch experiments in order to select the best conditions for the process and (ii) continuous experiments carried out in counter current mixer-settler circuits. The batch experiments indicated that an increase in nitrate concentration did not correspond to a rise in the separation factor among Zr and Hf. Acidity has a significant influence on the Zr/Hf separation. For the organic phase containing 2.5 mol L-1 of TBP and an aqueous/organic ratio of the 1/1, 94% of the Zr was extracted and a separation factor of the 13.8 was obtained in one contact of the aqueous and organic phase. In the optimized continuous circuit, a product containing 99% of Zr and 0.03% of Hf (200 mg kg(-1)), which meets the nuclear zirconium specifications, was obtained.
机译：在这项工作中描述了从硝酸液中获得核级氧化锆的具体方法。在碱融合和锆浓缩物的水浸出后获得液体。当磷酸二丁酯（TBP）用作具有高酸度硝酸铋的萃取剂时，可以产生核锆氧化物。该研究包括步骤：（i）批量实验，以便为该方法的最佳条件和（ii）在柜台电流混合器 - 沉降器电路中进行的连续实验。批量实验表明硝酸盐浓度的增加与Zr和Hf之间的分离因子的增加不相称。酸度对Zr / HF分离具有显着影响。对于含有2.5mol L-1的有机相的TBP和1/1,94％的Zr的水/有机比例，在水性和有机相的一个接触中获得分离因子。在优化的连续电路中，获得了含有99％Zr和0.03％HF（200mg kg（-1））的产物，该产品符合核锆规格。

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