Abstract

A solid waste from zinc production, zinc plant residue (ZPR) is a valuable resource for the recovery of zinc (Zn), lead (Pb), and silver (Ag). However, the ferritic structure of ZPR makes it difficult to leach these metals. Here, in order to increase the reactivity of the ZPR, mechanical activation using a high-energy ball mill was used. The sample mechanically activated for 15 min was subjected to two-stage leaching with the hydrochloric acid (HCl) solution. At the 1st stage, 74% of Zn was recovered from mechanically activated ZPR sample into the solution under the following conditions: 1 M HCl, 120 min leaching duration, liquid-to-solid ratio (L : S) of 4, the temperature of 25°C, and a rotation speed of 600 rpm. At the 2nd stage, 56% of Pb and 53% of Ag were recovered from the leaching residue, under the following optimized conditions: 8 M HCl, 120 min leaching duration, liquid-to-solid ratio (L : S) of 20, the temperature of 25°C, and a rotation speed of 600 rpm. Сonceptual flow-diagram of the zinc, lead and silver selective recovery from ZPR is proposed herein.

中文翻译：

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机械活化锌厂残渣中锌、铅和银的选择性盐酸浸出

摘要

锌生产中的固体废物，锌厂残渣 (ZPR) 是回收锌 (Zn)、铅 (Pb) 和银 (Ag) 的宝贵资源。然而，ZPR 的铁素体结构使其难以浸出这些金属。在此，为了提高 ZPR 的反应性，使用了使用高能球磨机的机械活化。将机械活化 15 分钟的样品用盐酸 (HCl) 溶液进行两阶段浸出。在第一阶段，在以下条件下，从机械活化的 ZPR 样品中将 74% 的 Zn 回收到溶液中：1 M HCl，浸出时间 120 分钟，液固比 (L: S) 为 4，温度为25°C，转速为 600 rpm。在第二阶段，在以下优化条件下，从浸出残渣中回收了 56% 的 Pb 和 53% 的 Ag：8 M HCl，浸出时间120分钟，液固比（L：S）为20，温度25°C，转速600 rpm。本文提出了从 ZPR 中选择性回收锌、铅和银的概念流程图。