ABSTRACT This research study reviews a direct comparison of the loading capabilities and selectivity of 13 different ion exchange resins represented in 24 different commercial resins for the removal of Fe(III) from synthetic Ni(II) leach liquor. The use of ion-exchange resins for selectively removing high concentrations of Fe(III) from leach liquor is presented as an alternative to current Fe precipitation processes in base metal industry. Our results show that resins with aminophosphonic, iminodiacetic, a combination of phosphonic-sulfonic groups, and methyl-glucamine groups favored the Fe(III) loading over Ni(II) and obtained high percentage of metal loadings. Resins with carboxylic, amidoxime, phosphoric, and phosphinic acid groups also favored the Fe(III) loading but achieved low percentage of metal loadings. Resins with active sulfur groups containing thiourea, isothiouronium, and thiol showed compromised adsorption preferences to Fe(III), and achieved low percentage of metal loadings. Sulfonic groups showed no adsorption preferences for Fe(III) but achieved relatively high metal loadings. Contrarily, bis-picolylamine groups showed preferences for Ni(II) loading. Our results suggest that resins with methyl-glucamine and amidoxime groups have the best potential to achieve successful Fe(III) removals. Thus, the recovery of high concentrations of Fe(III) at similar Ni(II) concentrations by ion exchange resins is confirmed at laboratory scale supporting its potential to replace precipitation in the base metal purification process. Further technical and economic studies for the development and scale-up process are still required to confirm its industrial application.

中文翻译：

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不同官能团离子交换树脂分离铁镍潜在铁副生产的研究

摘要 本研究回顾了 24 种不同商业树脂中代表的 13 种不同离子交换树脂从合成 Ni(II) 浸出液中去除 Fe(III) 的负载能力和选择性的直接比较。使用离子交换树脂从浸出液中选择性去除高浓度的 Fe(III) 是目前贱金属工业中 Fe 沉淀工艺的替代方案。我们的结果表明，具有氨基膦酸、亚氨基二乙酸、膦酸-磺酸基团和甲基-葡糖胺基团的树脂有利于 Fe(III) 负载而不是 Ni(II)，并获得高百分比的金属负载。具有羧酸、胺肟、磷酸和次膦酸基团的树脂也有利于 Fe(III) 负载，但金属负载百分比较低。具有含硫脲、异硫脲鎓和硫醇的活性硫基团的树脂对 Fe(III) 的吸附偏好受到损害，并且金属负载百分比较低。磺酸基团对 Fe(III) 没有吸附偏好，但实现了相对较高的金属负载。相反，双吡啶甲胺基团显示出对 Ni(II) 负载的偏好。我们的结果表明，具有甲基葡糖胺和胺肟基团的树脂最有可能成功去除 Fe(III)。因此，通过离子交换树脂以相似的 Ni(II) 浓度回收高浓度的 Fe(III) 在实验室规模得到证实，支持其替代贱金属纯化过程中沉淀的潜力。