Chalcopyrite (CuFeS₂) is the most refractory copper mineral when treated in conventional sulfate media leaching systems. This is the first study to examine the use of a dimethyl sulfoxide (CH₃SOCH₃, DMSO) solution containing copper chloride (CuCl₂) for the leaching of chalcopyrite. Leaching experiments for a copper concentrate composed mainly of chalcopyrite were conducted at ambient pressure at 313–413 K. The leaching fractions of Cu, Fe, S, Au, and As were investigated. It was found that 90% of the Cu was extracted in 2 h, and 94% was extracted in 4 h at 373 K, which is competitive with other conventional processes. A DMSO solution containing CuCl₂ could selectively dissolve the valuable metals Cu and Au from chalcopyrite, but leave minerals with little economic value such as pyrite (FeS₂) and As in the residue. Chalcopyrite is oxidized by cupric ion in proportion to the stoichiometric ratio of Cu in the concentrate to the initial cupric ion in the DMSO solution, which is enhanced by the presence of oxygen below 373 K.

在常规硫酸盐介质浸出系统中处理时，黄铜矿（CuFeS ₂）是最难熔的铜矿物。这是第一个研究使用含氯化铜（CuCl ₂）的二甲基亚砜（CH ₃ SOCH ₃，DMSO）溶液浸提黄铜矿的研究。在环境压力为313–413 K的条件下，对主要由黄铜矿组成的铜精矿进行了浸出实验。研究了Cu，Fe，S，Au和As的浸出率。发现在373 K的2 h内提取了90％的Cu，在4 h内提取了94％的Cu，这与其他常规工艺相比具有竞争优势。含有CuCl _2的DMSO溶液可以选择性地溶解黄铜矿中的有价金属Cu和Au，但在残留物中留下黄铁矿（FeS ₂）和As等经济价值不高的矿物。黄铜矿被铜离子氧化的程度与精矿中的铜与DMSO溶液中初始铜离子的化学计量比成比例，而373 K以下的氧气会增强黄铜矿氧化铜的作用。