Abstract

Calculations and experimental analysis of phosphate ores contaminated with Fe(III) compounds showed that advanced processing of these ores in a scheme with recycling of Fe(III) compounds is possible. The selective precipitation of \({\text{PO}}_{4}^{{3 - }}\) ions from a nitric acid extract with Fe(III) ions in the form of a FePO₄ precipitate, the subsequent alkaline extraction of \({\text{PO}}_{4}^{{3 - }}\) ions from FePO₄, and the dissolution of the formed Fe(OH)₃ precipitate in HNO₃ make it possible to obtain soluble phosphates and to recycle Fe(III) ions for the precipitation of \({\text{PO}}_{4}^{{3 - }}\) from the nitric acid extract. The residual P(V) content in the Fe(OH)₃ precipitate under the conditions of the recycling of Fe(III) ions is 0.80 wt %, which corresponds to a degree of \({\text{PO}}_{4}^{{3 - }}\) extraction from FePO₄ of 97.1%. The results of the theoretical calculations agree with the obtained experimental data. The proposed original solutions make it possible to process more phosphate ore contaminated with Fe(III) compounds with smaller amounts of Fe(III) compounds, including those contained in the ore.

中文翻译：

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再循环法从高铁杂质磷矿中选择性分离磷离子的理论与实践基础

摘要

对被 Fe(III) 化合物污染的磷酸盐矿石进行的计算和实验分析表明，在回收 Fe(III) 化合物的方案中对这些矿石进行高级加工是可能的。硝酸提取物中的\({\text{PO}}_{4}^{{3 - }}\)离子与 FePO ₄沉淀形式的 Fe(III) 离子选择性沉淀，随后呈碱性从 FePO ₄中提取\({\text{PO}}_{4}^{{3 - }}\)离子，并将形成的 Fe(OH) ₃沉淀溶解在 HNO ₃中，可以获得可溶性磷酸盐和回收 Fe(III) 离子以沉淀\({\text{PO}}_{4}^{{3 - }}\)从硝酸提取物中。_{在Fe(III)离子循环利用的条件下，Fe(OH) 3}沉淀中的残留P(V)含量为0.80 wt %，对应的程度为\({\text{PO}}_{4 }^{{3 - }}\)从 FePO ₄中提取97.1%。理论计算结果与得到的实验数据一致。所提出的原始解决方案可以用较少量的 Fe(III) 化合物（包括矿石中所含的那些）处理更多被 Fe(III) 化合物污染的磷酸盐矿石。