In the present study, a method for cobalt recovery from Zinc Plant Residue (ZPR) has been developed. First, the residue was leached in a dilute sulfuric acid solution. >90% cobalt and 95% zinc were leached in two hours at room temperature. Then, leach liquor was purified before cobalt precipitation. First, copper and cadmium were removed using zinc dust. >99% copper and 80% cadmium were removed in 30 min at room temperature with slow agitation. Then, dissolved iron was removed using sodium persulfate as an oxidizing agent, and lime was used to maintain pH. Iron was precipitated (∼99%) in 1 h at 60 °C temperature by maintaining pH at 3.5 and Eh at 700 mV. After iron removal, cobalt was precipitated by using sodium persulfate as an oxidizing agent, and sodium hydroxide was used to maintain pH. The cobalt precipitate was calcined and then the final product was obtained with 58% Co. The filtrate, obtained after cobalt precipitation, had a zinc concentration of approximately 69 g/L. About 82% cobalt and 90% zinc were recovered in the entire process.

中文翻译：

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从锌加工厂产生的锌厂残渣 (ZPR) 中回收高品位氧化钴


在本研究中，开发了一种从锌厂残渣（ZPR）中回收钴的方法。首先，将残余物浸入稀硫酸溶液中。 >90% 的钴和 95% 的锌在室温下在两小时内浸出。然后，在钴沉淀之前纯化浸出液。首先，使用锌粉去除铜和镉。在室温下缓慢搅拌 30 分钟内去除 >99% 的铜和 80% 的镉。然后，使用过硫酸钠作为氧化剂去除溶解的铁，并使用石灰来维持pH。通过将 pH 值保持在 3.5，Eh 保持在 700 mV，在 60 °C 温度下，铁在 1 小时内沉淀 (∼99%)。除铁后，用过硫酸钠作为氧化剂沉淀钴，用氢氧化钠维持pH。将钴沉淀物煅烧，然后获得含 58% Co 的最终产品。钴沉淀后获得的滤液的锌浓度约为 69 g/L。整个过程中回收了约82%的钴和90%的锌。