The resource utilization of zinc oxide dust (ZOD) is mainly focused on the efficient recovery of zinc by acid leaching at present. Because of a large amount of iron in ZOD and zinc components existing in multi-phase, the problems of low zinc recovery and the separation of zinc and iron ions in the leaching solution are unavoidable. Considering the characteristics of ZOD and the advantages of spinel zinc ferrite (ZnFeO) in the advanced oxidation degradation of organic wastewater, a new strategy for clean utilization of ZOD is proposed. The leaching efficiency of soluble zinc components in ZOD reached 96.7 % by selective dissolution with low concentration sulfuric acid solution, and the leaching solution without iron ions can be directly used for electrolytic zinc recovery. The insoluble components of zinc and iron in the leaching residue were converted into ZnFeO by solid phase roasting. By adjusting the roasting temperature, time and molar ratio of Fe/Zn in roasting process, the proportion of zinc elements in the form of ZnFeO reached 99.56 % and a single spinel zinc ferrite product was obtained. Zinc ferrite product activated by ball milling for 2 h (ZFO-2) showed very high catalytic activity in the treatment of organic wastewater by peroxonosulfate (PMS). In the presence of 1 mM PMS and 1 g/L ZFO-2 at 20 °C, the ZFO-2/PMS system achieved a removal rate of over 90 % within 40 min for wastewater containing RhB, MO and MG (10 mg/L). In addition, ZFO-2 is ferromagnetic and easily recovered by magnetic separation. The new strategy proposed in this paper takes into account the efficient recovery of soluble zinc components and the cooperative high-value utilization of insoluble components of zinc and iron in ZOD, which is a comprehensive utilization method with more sustainable resource allocation.

中文翻译：

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氧化锌粉尘清洁利用新策略：固相反应制备尖晶石铁酸锌及其催化降解有机废水


目前氧化锌粉尘（ZOD）的资源化利用主要集中在酸浸法高效回收锌上。由于ZOD中含有大量的铁和多相存在的锌组分，不可避免地存在浸出液中锌回收率低以及锌铁离子分离的问题。结合ZOD的特点以及尖晶石铁酸锌（ZnFeO）在有机废水高级氧化降解中的优势，提出了ZOD清洁利用的新策略。通过低浓度硫酸溶液选择性溶解，ZOD中可溶性锌成分的浸出效率达到96.7%，浸出液不含铁离子，可直接用于电解锌回收。通过固相焙烧将浸出渣中的锌、铁不溶成分转化为ZnFeO。通过调整焙烧过程中的焙烧温度、时间和Fe/Zn摩尔比，使ZnFeO形式的锌元素比例达到99.56%，得到单一尖晶石型铁酸锌产品。球磨 2 小时活化的铁酸锌产品 (ZFO-2) 在过氧硫酸盐 (PMS) 处理有机废水中表现出非常高的催化活性。在 20°C 下，在 1 mM PMS 和 1 g/L ZFO-2 存在下，ZFO-2/PMS 系统在 40 分钟内对含有 RhB、MO 和 MG 的废水（10 mg/ L）。此外，ZFO-2具有铁磁性，易于通过磁分离回收。 本文提出的新策略兼顾了ZOD中可溶性锌成分的高效回收以及锌铁不溶性成分的协同高值利用，是一种资源配置更加可持续的综合利用方法。