Journal of Sustainable Metallurgy ( IF 2.5 ) Pub Date : 2022-04-26 , DOI: 10.1007/s40831-022-00528-6 Hong Qin 1, 2 , Brian Makuza 1 , Jianwei Zhao 1 , Dawei Yu 1, 2 , Xueyi Guo 1, 2 , Qinghua Tian 1, 2
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Global demand for cobalt is proliferating owing to the transition towards a low carbon economy. Recovery of cobalt from copper-cobalt alloy ensures the sustainability of the cobalt resources as it contains significant amounts of cobalt. This paper proposes a method for hydrochlorination roasting of copper-cobalt alloy with HCl gas followed by water leaching. The influences of the main factors (roasting temperature, roasting time, HCl gas flow rate, and leaching time) on the separation efficiency of the process were investigated. During the hydrochlorination roasting process, the dense structure of copper-cobalt alloy was destroyed, the Si, Cu, Fe, and Co volatilization efficiencies of 72.73%, 8.47%, 0.44%, and 0.07% were obtained. In addition, the Co, Fe, Cu, and Si in the copper-cobalt alloy were mostly transformed into CoCl2, FeCl2, Cu, and SiCl4. This is exceptionally conducive to the subsequent selective water leaching of Co and Fe and reduces the difficulty of subsequent purification. It was also confirmed by the leaching experiments. For the leaching process, Co and Fe were selectively extracted from roasted product, and Cu retained in the residue mainly in the form of metallic copper. The water leaching efficiencies of Co, Fe, and Cu in the roasted product were 87.76%, 93.25%, and 4.85% under optimized conditions.
Graphical Abstract
中文翻译：
铜钴合金的氢氯化作用用于有价金属的高效分离
由于向低碳经济过渡，全球对钴的需求正在激增。从铜钴合金中回收钴确保了钴资源的可持续性，因为它含有大量的钴。提出了一种用HCl气体对铜钴合金进行氢氯化焙烧后水浸的方法。考察了焙烧温度、焙烧时间、HCl气体流量、浸出时间等主要因素对工艺分离效率的影响。在氢氯化焙烧过程中，铜钴合金的致密结构被破坏，获得了72.73%、8.47%、0.44%和0.07%的Si、Cu、Fe和Co挥发效率。此外，铜钴合金中的Co、Fe、Cu、Si大部分转化为CoCl2、FeCl 2、Cu和SiCl 4。这特别有利于后续对Co和Fe的选择性水浸，降低后续提纯的难度。浸出实验也证实了这一点。在浸出过程中，从焙烧产物中选择性地提取出钴和铁，而铜主要以金属铜的形式保留在残渣中。优化条件下焙烧产物中Co、Fe和Cu的水浸出率分别为87.76%、93.25%和4.85%。
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