氯化物介质矿浆电解法浸出硫化铜精矿

来源期刊：中国有色金属学报1997年第4期

论文作者：曾青云 刘建华

文章页码：61 - 64

关键词：硫化铜精矿 矿浆电解 浸出 铜粉

Key words：sulphide copper concentrate slurry electrolysis leaching copper powder

摘    要：研究了在FeCl₃-HCl-NaCl体系中直接电解浸出硫化铜精矿矿浆制取铜粉的工艺条件及机理。试验表明，在阳极初始溶液含Fe³⁺ 60 g/L、HCl 30g/L、NaCl 150g/L，阴阳极电流密度分别为350和600A/m²， 100℃的条件下浸出5h，可获得铜浸出率98.8% 、渣含铜0.34%、铜粉纯度97.5%的结果；Fe³⁺浓度是影响铜浸出率最显著的因素，阳极上发生的主要反应是Fe²⁺的氧化；元素硫产生的机理是酸直接分解黄铜矿 生成H₂S，H₂S溶解后再被Fe³⁺氧化。

Abstract: The leaching technology and mechanism of direct slurry electrolysis of sulphide copper concentrates in FeCl₃-HCl-NaCl system for winning copper powder have been studied. The results showed the possibility of reaching 98.8% copper dissolution efficiency and containing copper 0.34% in leaching residue, winning cathode copper powder 97.5% in grade by treatment of the concentrates with an initial anode solution containing Fe³⁺ 60g/L, HCl 30g/L, NaCl 150g/L at 100℃ for 5h employing anode current density of 600A/m² and cathode current density of 350A/m². Fe³⁺ concentration is a key factor to affect the copper dissolution rate and the main reaction on the anode is the oxidation of ferrous ions. The mechanism of the formation of elemental S is probably the result that the chalcopyrite concentrates are directly attacked by acid, the generated H₂S dissolves in the solution and subsequently be oxidized by ferric ions.