锆
硝酸
化学
磷酸三丁酯
水溶液
浸出(土壤学)
铪
无机化学
萃取(化学)
普雷克斯
双水相体系
碱金属
核化学
色谱法
溶剂萃取
有机化学
土壤水分
土壤科学
环境科学
作者
Janúbia C.B.S. Amaral,Adalberto Leles de Souza,Carlos A. Morais
标识
DOI:10.1080/00986445.2019.1573170
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.
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