Abstract Jarosite is a harmful by-product of hydrometallurgical process and is categorized as hazardous waste due to the presence of heavy metals (Cu, Ni, Pd, etc.) in it. It is difficult to recycle these metals due to their complex phase structures. In this study, a facile and novel process for recovering metal values from jarosite in nickel hydrometallurgical process was developed. The jarosite was firstly thermally treated at a low temperature (650 °C). During this process, the jarosite turned into simple phases, and valuable metals were released in forms of Cu2+, Ni2+ and Fe2O3. Then, the thermally decomposed product was leached by water. 93.58% copper and 95.78% nickel can be recovered. The iron in the leaching residue can be directly recycled as iron oxide product. The proposed process has advantages in low chemicals consumption and short process. It can not only efficiently recover metal values (Ni, Cu), but also realize high-value utilization of iron resources, which enjoys significant application potential in the comprehensive utilization of jarosite.

中文翻译：

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热处理浸出湿法冶金镍生产黄钾铁矾中金属的回收

摘要 黄钾铁矾是湿法冶金过程中的一种有害副产品，由于其中含有重金属（Cu、Ni、Pd等）而被列为危险废物。由于其复杂的相结构，很难回收这些金属。在这项研究中，开发了一种在镍湿法冶金过程中从黄钾铁矾中回收有价金属的简便而新颖的工艺。黄钾铁矾首先在低温（650℃）下进行热处理。在这个过程中，黄钾铁矾变成简单的相，有价值的金属以 Cu2+、Ni2+ 和 Fe2O3 的形式释放出来。然后，将热分解产物用水浸出。可回收93.58%的铜和95.78%的镍。浸出渣中的铁可直接作为氧化铁产品回收。所提出的工艺具有化学品消耗低、流程短的优点。它不仅可以高效回收有价金属（Ni、Cu），还可以实现铁资源的高价值利用，在黄钾铁矾综合利用方面具有显着的应用潜力。