The mobility of gold and silver metals from refractory ores is very low due to free metal ions in their bodies that bind the transportable and free metal molecules or they are encapsulated in minerals such as sulfides, arsenosulfides, carbonaceous, and clayey materials which make it difficult to extract them. As known from the literature, the enrichment of oxide refractory gold, silver ores, Ag, and Au-rich flotation concentrated from sulfur refractory ores can be leached in the chloride-hypochlorite solutions. In this work, the leaching approach was studied to extract silver ions from refractory ores in the presence of hypochlorite media under high pressure. The mineralogical and scanning electron microscopy analysis of the sample indicated that the silver was encapsulated in barite and quartz minerals in fine sizes. In order to obtain the optimum leaching conditions for the silver ore, the effects of several parameters, namely, temperature, leaching time, NaCl and NaOCl concentration, solid ratio, and particle size on the leaching recovery were investigated in detail. The leaching experiments showed that the highest silver recovery of 62.35% was obtained under the following conditions: temperature of 150 °C, oxygen pressure of 1800 kPa, leaching time of 2 h, concentrations of 2 mol/dm³ and 0.4 mol/dm³ for NaCl and NaOCl, respectively, the solid ratio of 30%, and particle size (d₈₀) 15 μm. The results obtained from this study indicated that the enrichment of refractory silver ores to extract the silver encapsulated in barite and quartz minerals could be possible in the chlorite-hypochlorite under high pressure, a relatively shorter leaching time compared to conventional cyanide leaching.

难熔矿石中金和银金属的迁移率非常低，这是因为它们体内的自由金属离子会结合可运输的金属分子和游离金属分子，或者它们被包裹在矿物中，例如硫化物，砷硫化物，碳质和黏土质材料，这使其很难提取它们。如从文献中已知的，可以将从硫耐火矿石中浓缩的氧化物耐火金，银矿石，Ag和富Au浮选的富集在氯-次氯酸盐溶液中浸出。在这项工作中，研究了在次氯酸盐介质存在下在高压下从难处理矿石中提取银离子的浸出方法。样品的矿物学和扫描电子显微镜分析表明，银被包裹在细尺寸的重晶石和石英矿物中。为了获得银矿石的最佳浸出条件，详细研究了温度，浸出时间，NaCl和NaOCl浓度，固相比和粒径等几个参数对浸出回收率的影响。浸出实验表明，在以下条件下可获得最高的银回收率：62.35％：温度为150°C，氧气压力为1800 kPa，浸出时间为2 h，浓度为2 mol / dmNaCl和NaOCl分别为³和0.4 mol / dm ³，固含量为30％，粒径（d ₈₀）为15μm。从这项研究获得的结果表明，在亚氯酸盐-次氯酸盐中，在高压下富集难熔银矿石以提取包裹在重晶石和石英矿物中的银是可能的，与传统的氰化物浸出相比，浸出时间相对较短。