In hydrometallurgical processes, chemical precipitation is used either to recover dissolved valuable metals or to remove undesirable elements before electrolysis. Beside conventional reagents (Ca(OH)₂, NaOH, Na₂CO₃…) many authors tried to replace them by bio-sourced compounds, but unfortunately, without necessarily leading to an industrial use. This paper describes a study on the possibility to use phytic acid to remove Al³⁺, Fe³⁺ and Pb²⁺ from acidic leachates. This reagent, present in cereals and considered as an antinutrient, can be recovered from soaking waters of corn. In this work, five metal phytates were synthesized and characterized by TGA and ICP-OES leading to the following formulae: Al₃C₆H₉P₆O₂₄,7H₂O, Cu₆C₆P₆O₂₄,8H₂O, Fe_3.5C₆H_7.5P₆O₂₄,15H₂O, Pb₆C₆P₆O₂₄,10H₂O and Zn₆C₆P₆O₂₄,6H₂O. Solubility of each metal phytate was measured in pure water at 20°C in order to determine their solubility product K_s not available in literature. The conditional solubility as a function of the pH was then established to predict the possibility to perform selective precipitation. The results showed that phytic acid could be an interesting alternative precipitation reagent, able, from a thermodynamical point of view, to remove Al³⁺, Fe³⁺ and Pb²⁺ from copper or zinc leachates.

在湿法冶金过程中，化学沉淀可用于回收溶解的有价金属或在电解前去除不良元素。除了常规试剂（Ca（OH）₂，NaOH，Na ₂ CO ₃ …）以外，许多作者还尝试用生物来源的化合物代替它们，但不幸的是，不一定导致工业应用。本文描述了使用植酸去除Al ³⁺，Fe ³⁺和Pb ²⁺的可能性的研究来自酸性渗滤液。谷物中存在的这种试剂被认为是一种抗营养剂，可以从浸泡的玉米水中回收。在这项工作中，五金属肌醇六磷酸被合成和表征通过TGA和ICP-OES导致下式：铝₃ Ç ₆ ħ ₉ P ₆ ø ₂₄，7H ₂ O，的Cu ₆ Ç ₆ P ₆ ø ₂₄，8H ₂ ö ，铁_3.5 ç ₆ ħ _7.5 P ₆ ø ₂₄，15H ₂ O，铅₆ ç ₆ P ₆ø ₂₄，10H ₂ O和锌₆ Ç ₆ P ₆ ø ₂₄，6H ₂各金属植酸O.溶解度在纯水中在20℃下测定，以确定其ķ溶度积_小号在文献不可用。然后确定条件溶解度与pH的关系，以预测进行选择性沉淀的可能性。结果表明，植酸可能是一种有趣的替代沉淀剂，从热力学角度来看，它能够从浸出铜或锌中除去Al ³⁺，Fe ³⁺和Pb ²⁺。