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New pathway for utilization of jarosite, an industrial waste of zinc hydrometallurgy
Minerals Engineering ( IF 4.9 ) Pub Date : 2021-06-20 , DOI: 10.1016/j.mineng.2021.107030
Abd. Maihatchi Ahamed , M.N. Pons , Q. Ricoux , S. Issa , F. Goettmann , F. Lapicque

Generated by zinc hydrometallurgical production and containing several toxic species, jarosite has been little used or beneficiated to date. Utilization of jarosite can save mining resources by producing valuable products, and reduce potential hazards from jarosite disposal. To avoid high energy consumption as in the roasting steps of the current jarosite process, hydrometallurgy has been used in the various steps of an original process aimed at producing valuable zinc-iron alloys from industrial jarosite waste. The process designed consists of three main steps: (i) jarosite leaching by sulfuric acid solutions yielding Fe(III) and Zn(II) species; (ii) reduction of Fe(III) to Fe(II) upon addition of industrial blende; and (iii) electrodeposition of the alloy from the recovered acidic Fe-Zn solution. Care was also taken to limit the amount of alkali to be added by maintaining the pH in a narrow range; moreover, no specific additives were employed. The various steps of the process have been investigated and the most suitable conditions for high yields have been identified. Among the various impurities in the minerals used and recovered from the acidic solution, copper ions had to be removed by preferential electrodeposition prior to deposition of Zn-Fe alloys. Nevertheless, these results indicated the need for a divided cell to avoid galvanic interference in this last operation from the Fe(II)/Fe(III) couple, which was found to reduce the faradaic yield for alloy deposition from 69% in the first minutes to 30% after 30 min.



中文翻译:

湿法炼锌工业废料黄钾铁矾的利用新途径

黄钾铁矾由湿法冶金生产产生,含有多种有毒物质,迄今为止很少使用或选矿。黄钾铁矾的利用可以通过生产有价值的产品来节省矿产资源,并减少黄钾铁矾处置的潜在危害。为避免当前黄钾铁矾工艺的焙烧步骤中的高能耗,湿法冶金已用于原始工艺的各个步骤,旨在从工业黄钾铁矾废料生产有价值的锌铁合金。设计的工艺包括三个主要步骤:(i) 硫酸溶液浸出黄钾铁矾,产生 Fe(III) 和 Zn(II) 物种;(ii) 加入工业共混物后将 Fe(III) 还原为 Fe(II);(iii) 从回收的酸性 Fe-Zn 溶液中电沉积合金。还注意通过将 pH 值保持在一个狭窄的范围内来限制碱的加入量;此外,没有使用特定的添加剂。研究了该方法的各个步骤,并确定了最适合高产率的条件。在使用和从酸性溶液中回收的矿物中的各种杂质中,铜离子必须在沉积 Zn-Fe 合金之前通过优先电沉积去除。尽管如此,这些结果表明需要一个分开的电池来避免 Fe(II)/Fe(III) 对在最后一次操作中的电流干扰,发现这会在最初的几分钟内将合金沉积的法拉第产率从 69% 30 分钟后达到 30%。研究了该方法的各个步骤,并确定了最适合高产率的条件。在使用和从酸性溶液中回收的矿物中的各种杂质中,铜离子必须在沉积 Zn-Fe 合金之前通过优先电沉积去除。尽管如此,这些结果表明需要一个分开的电池来避免 Fe(II)/Fe(III) 对在最后一次操作中的电流干扰,发现这会在最初的几分钟内将合金沉积的法拉第产率从 69% 降低30 分钟后达到 30%。研究了该方法的各个步骤,并确定了最适合高产率的条件。在使用和从酸性溶液中回收的矿物中的各种杂质中,铜离子必须在沉积 Zn-Fe 合金之前通过优先电沉积去除。尽管如此,这些结果表明需要一个分开的电池来避免 Fe(II)/Fe(III) 对在最后一次操作中的电流干扰,发现这会在最初的几分钟内将合金沉积的法拉第产率从 69% 降低30 分钟后达到 30%。在沉积 Zn-Fe 合金之前,必须通过优先电沉积去除铜离子。尽管如此,这些结果表明需要一个分开的电池来避免 Fe(II)/Fe(III) 对在最后一次操作中的电流干扰,发现这会在最初的几分钟内将合金沉积的法拉第产率从 69% 降低30 分钟后达到 30%。在沉积 Zn-Fe 合金之前,必须通过优先电沉积去除铜离子。尽管如此,这些结果表明需要一个分开的电池来避免 Fe(II)/Fe(III) 对在最后一次操作中的电流干扰,发现这会在最初的几分钟内将合金沉积的法拉第产率从 69% 降低30 分钟后达到 30%。

更新日期:2021-06-20
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