Given the limitations of current processing methods and the potential of high recovery of silver as a flotation concentrate, this study proposes a pre-oxidation followed by oxygen pressure sulphuric acid leaching route for zinc, copper and indium and thoroughly examines the alteration in micro-morphology of the silver concentrate of 1.22% Pb, 3010 g/t Ag and 649 g/t In. Under the optimal conditions of a sulphuric acid pre-oxidation temperature of 60 °C, and an acid-to-ore mass ratio of 0.6, over 15 h, the PO and -OH polar groups of flotation reagents on the surface of silver concentrate particles are effectively neutralized through sulphuric acid oxidation. This action prevents the formation of a hydration film and mineral inclusions, thereby facilitating the efficient leaching of valuable elements. With a set reaction temperature of 155 °C, an initial acidity of 160 g/L, a reaction time of 180 min, an oxygen partial pressure of 0.8 MPa and a liquid-to-solid ratio of 7 mL/g, the leaching efficiency of Zn, Cu and In in the silver concentrate reach 94.8%, 98.4% and 91.1%, respectively while the lead and silver grades in the leach residue increase to 2.88% and 7754 g/t, respectively.

中文翻译：

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银精矿预氧化及氧压浸出Zn、Cu、In浸出行为研究


考虑到当前处理方法的局限性以及银作为浮选精矿的高回收率的潜力，本研究提出了锌、铜和铟的预氧化，然后氧压硫酸浸出路线，并彻底检查了微观形态的变化含 1.22% Pb、3010 g/t Ag 和 649 g/t In 的银精矿。在硫酸预氧化温度60℃、酸矿质量比0.6的最佳条件下，15h内，银精矿颗粒表面浮选药剂的PO和-OH极性基团通过硫酸氧化被有效中和。这种作用可以防止水化膜和矿物包裹体的形成，从而促进有价值元素的有效浸出。设定反应温度155 ℃、初始酸度160 g/L、反应时间180 min、氧分压0.8 MPa、液固比7 mL/g时，浸出效率银精矿中Zn、Cu和In的含量分别达到94.8%、98.4%和91.1%，浸出渣中铅和银的品位分别提高到2.88%和7754 g/t。