The copper silicate ore chrysocolla forms a large potential copper resource, which has not yet been fully exploited, due to difficulties associated with its beneficiation by flotation and metallurgical processing. Direct acid leaching of chrysocolla causes silica gel formation. Therefore, in this work, the feasibility of solvometallurgical methods to leach copper from high-grade chrysocolla while avoiding issues with silica gel formation was assessed. Ammoniacal solvoleaching was performed with a solvent comprising the chelating extractant LIX 984 N or the acidic extractant Versatic acid 10 in an aliphatic diluent (ShellSol D70 or GTL Fluid G70), combined with a small volume of aqueous ammonia. In the three-phase system, aqueous ammonia dissolves copper from milled and sieved chrysocolla, while copper is simultaneously extracted to the organic phase, releasing ammonia that can be reused for further extraction. The best results were obtained with LIX 984 N as extractant: using a 50 vol% LIX 984 N solution, about 75% of copper could be extracted after 60 min of leaching at 25 °C. The stripping of copper from the pregnant leach solution was optimized. Quantitative stripping of copper was achieved with 1.89 M sulfuric acid and the final aqueous solution of copper sulfate had a concentration of 33 g L⁻¹. Experiments in a leaching reactor (1 L) and small battery of mixer-settlers (3 stages, 35 and 143 mL effective volume in the mixer and the settler, respectively, per stage) were successfully conducted and allowed to recover copper with a purity of 99.9%. A conceptual flow sheet has been developed.

Graphical Abstract

中文翻译：

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高档蛇纹石中氨的铜溶剂溶出

由于通过浮选和冶金工艺对其进行选矿有困难，因此硅酸铜矿石形成了巨大的潜在铜资源，但尚未得到充分开发。金刚ry的直接酸浸导致硅胶的形成。因此，在这项工作中，评估了用溶剂冶金法从高级金ry石中浸出铜同时避免硅胶形成问题的可行性。在脂族稀释剂（ShellSol D70或GTL Fluid G70）中，使用包含螯合萃取剂LIX 984 N或酸性萃取剂Versatic acid 10的溶剂与少量氨水混合，进行氨溶溶剂化。在三相系统中，氨水会溶解经过研磨和筛分的金相胶中的铜，同时将铜提取到有机相中，释放出氨，可将其重新用于进一步提取。使用LIX 984 N作为萃取剂可获得最佳结果：使用50％体积的LIX 984 N溶液，在25°C浸出60分钟后，可以萃取约75％的铜。优化了从浸出液中去除铜的工艺。用1.89 M硫酸进行铜的定量汽提，最终硫酸铜水溶液的浓度为33 g L^-1。在浸出反应器（1 L）和小型混合搅拌器电池中进行了实验（3个阶段，混合器和沉降器的有效体积分别为35和143 mL，每个阶段），并回收了纯度为99.9％。已经开发出概念流程图。

图形概要