The copper smelting process produces plenty of copper slag every year, which is a hazardous solid waste, but a secondary resource. In the present study, the extraction of copper, nickel, and cobalt from copper slag was investigated through the process of sulfation roasting–water leaching and the process of sulfation roasting–sulfate decomposition roasting–water leaching respectively. Compared with the process of sulfation roasting–water leaching, the process of sulfation roasting–sulfate decomposition roasting–water leaching is a better choice, which could not only get almost the same leaching of copper, nickel, and cobalt as the former process, but has a lower leaching of iron and aluminum. For the process of sulfation roasting–sulfate decomposition roasting–water leaching, the leaching of Cu, Ni, and Co reached up to 74.2%, 71.1%, and 69.6% respectively, under the optimal conditions including sulfation roasted with 80 wt% sulfuric acid addition at 200 °C for 60 min and sulfate decomposition roasted at 650 °C for 60 min, followed by water leached at 90 °C for 30 min with a liquid–solid ratio of 2 ml/g. The leaching of Fe and Al was only 4.9% and 17.6%.

中文翻译：

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从铜渣中回收有价金属

铜冶炼过程每年都会产生大量的铜渣，这是一种危险的固体废物，但却是次要资源。本研究分别通过硫酸化焙烧-水浸工艺和硫酸化焙烧-硫酸盐分解焙烧-水浸工艺对铜渣中铜、镍和钴的提取进行了研究。与硫酸化焙烧-水浸工艺相比，硫酸化焙烧-硫酸盐分解焙烧-水浸工艺是一种更好的选择，不仅可以获得与前者几乎相同的铜、镍、钴浸出量，而且具有较低的铁和铝浸出率。硫酸盐焙烧-硫酸盐分解焙烧-水浸工艺中，Cu、Ni、Co的浸出率分别达到74.2%、71.1%和69%。分别为 6%，在最佳条件下，包括在 200 °C 下加入 80 wt% 硫酸焙烧 60 min 的硫酸盐化和在 650 °C 下焙烧 60 min 的硫酸盐分解，然后在 90 °C 下浸出 30 min液固比为 2 ml/g。Fe和Al的浸出率仅为4.9%和17.6%。