阳离子树脂净化铂族金属溶液的研究

研究了阳离子交换树脂净化含大量贱金属的铂族金属溶液的工艺条件, 结果表明, 在pH=1~1.5时001×7阳离子交换树脂吸附贱金属的次序为: Ni>Cu>Co>Fe; Fe、Ni、Co、Cu的穿透容量分别为(g/kg): 0.13, 1.25, 0.42, 0.87; 饱和容量分别为(g/kg): 0.32, 6.65, 2.33, 4.72, 合计为14.02 g/kg; 贱金属的分离效率主要取决于贵贱金属浓度及交换柱的数量; 吸附在树脂上的贱金属极易被6 mol/L HCl洗脱, 所有贱金属的最大洗脱均发生在洗脱液体积与床体积之比为1.0/1.7处, 当洗脱液体积为床体积的2.0倍时贱金属被完全洗脱。实验结果为离子交换分离贱金属净化铂族金属溶液的工业化应用提供了强有力的理论依据。

Purification of Platinum Group Metals Solution by Cation Exchange

The platimum group metals (PGMs) solution containing a large amount of base metals purified with cation exchange resin had been investigated. The results showed that the adsorption of base metals by 001×7 cation ion exchange resin at pH=1~1.5 was in the order of Ni>Cu>Co>Fe. From the tests, the breakthrough capacities (g/kg) of Fe, Ni, Co and Cu were 0.13, 1.25, 0.42 and 0.87, respectively, while the saturated capacities (g/kg) were 0.32, 6.65, 2.33 and 4.72, respectively and 14.02 g/kg in total. It is shown that the separation efficiency of the base metals depends largely on the concentrations of the precious and base metals, as well as the number of exchange columns. The base metals absorbed on the resin could be easily eluted by adding HCl solution at the amount of 6 mol/L, with the elution reaching the maximum as the eluent volume and bed volume at the ratio of 1.0/1.7 and completely finished as the eluent volume being 2.0 times the bed volume. The experimental results can definitely provide a theoretical basis favorably for the industrial application of PGMs solution purified by cation exchange resin.