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首页> 外文期刊>Hydrometallurgy >Simulation of iron oxide/silica precipitation in the paragoethite process for the removal of iron from acidic zinc leach solutions
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Simulation of iron oxide/silica precipitation in the paragoethite process for the removal of iron from acidic zinc leach solutions

机译：模拟从杂锌矿中去除酸性锌浸出溶液中铁的氧化铁/二氧化硅沉淀

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摘要

An investigation of the simultaneous precipitation of iron oxide and silica species from acidic solutions was conducted, simulating the paragoethite process, an iron-removal stage employed in zinc hydrometallurgy. Laboratory-based continuous crystallisation experiments were carried out under the primary conditions employed in industry, with pH (at 85 °C) maintained at 2.65, the combined Fe and Si concentration at 0.1128 M (unless otherwise stated) and Si:Fe molar ratios varied from 0 to 0.43. The crystal structure of the residues produced was characterised, with the extent of iron and silicate removal quantified and properties relating to aggregate structure also measured. It is shown that the degree of silica polymerisation prior to the precipitation reaction dictates the mechanism of co-precipitation and thereby the properties of the residue.
机译：研究了从酸性溶液中同时析出氧化铁和二氧化硅的现象，模拟了杂锌铁矿工艺，这是锌湿法冶金中的除铁阶段。基于实验室的连续结晶实验是在工业中使用的主要条件下进行的，pH（在85°C时）保持在2.65，Fe和Si的合并浓度为0.1128 M（除非另有说明），并且Si：Fe摩尔比变化从0到0.43。表征了产生的残留物的晶体结构，定量了去除铁和硅酸盐的程度，还测量了与聚集体结构有关的性能。结果表明，沉淀反应之前二氧化硅的聚合程度决定了共沉淀的机理，从而决定了残余物的性质。

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