用离子交换法从潜在钪资源的铜浸出残液中回收钪

来源期刊:中国有色金属学报(英文版)2020年第11期

论文作者:H. HAJMOHAMMADI A. H. JAFARI M. ESKANDARI NASAB

文章页码:3103 - 3113

关键词:钪;离子交换;吸附;解吸;铜浸出液

Key words:scandium; ion exchange; sorption; desorption; copper leach solution

摘    要:伊朗Sarcheshmeh铜联合企业的铜浸出残液含有高达3 mg/L的钪,明显高于许多现有的钪资源,因而成为用离子交换法回收钪的可能原料。使用Visual Minteq软件确定在矿山工艺条件下可能形成的离子物种,从而选择合适的离子交换树脂。所选择的阳离子树脂在静态试验中用于含有离子的合成溶液,以及在静态/动态试验中用于实际的铜矿浸出残液。室温和pH值为1.5时,钪的吸附率最高。在动态试验中,残液流量为450 BV时,树脂达到完全饱和。在恒定时间的静态洗脱试验中,使用碳酸钠洗脱,树脂中Sc、Y、Ce的解吸率高于Fe、Al和Cu。动态洗脱试验结果表明,洗脱的优先顺序和洗脱程度具有相似的趋势。动态试验样品的解吸结果表明,浓缩比达到60:1,可得到186 mg/L的富钪溶液。

Abstract: Raffinate copper leach solution of the Iran Sarcheshmeh copper complex has up to 3 mg/L scandium (Sc), which is significantly better than many existing sources, making it a possible source for the recovery of Sc using the ion exchange method. Visual Minteq software was employed to ascertain the ionic species likely to be formed under operational conditions in the mine and for selecting the suitable ion exchange resin. The cationic resin thus chosen was employed statically with ions-bearing synthesized solutions and statically/dynamically for actual copper mining raffinate solution. Room temperature and pH of 1.5 showed the highest Sc adsorption. The dynamic tests established the full saturation of the resin at 450 BV of the raffinate solution flow. Using sodium carbonate for elution, desorption of Sc, Y and Ce from the resin during static elution tests at constant duration was higher than that of Fe, Al and Cu. The results from the dynamic tests followed similar trends for the priority and the extent of the elution process. Desorption results from specimens of dynamic tests show a 60:1 concentration ratio leading to a 186 mg/L Sc-rich solution.

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