The paper provides a theoretical justification of the key chemical aspects of enhancing the process of heap leaching (HL) of gold by using a reagent complex containing hydrogen peroxide. A schematic illustration of heterogeneous catalytic reactions, which occur during metal leaching, as well as examples of the geometry and dissociation energy of a number of gold clusters are presented. The paper provides the results of studying the mineral composition of various types of waste produced by the Darasun mine, including cut-off grade ores of the Talatuy deposits (gold content — 0.7 g/t), mature tailings of the Darasun gold-processing plant (GPP) (gold content — 1.45 g/t), and flotation tailings of the current ore processing at the Darasun GPP (gold content — 0.3 g/t). A process flow diagram is presented to describe the conducted experimental studies of heap leaching of gold from the pelletized granules of technogenic minerals obtained from various types of mining waste. The process of leaching was performed using a reagent complex containing sodium cyanide solution and hydrogen peroxide, which served as a catalyst of the chemical reactions. The conditions that must be met by the geomaterial to be pelletized in order to obtain strong granules and enable gold leaching have been identified. The optimal values of the following key process parameters were determined: grain size of the crushed cut-off grade ore; waste fraction of the pelletized geomaterial (cut-off grade ore : mature tailings : current processing tailings = 1:0.5:0.5); amounts of sodium cyanide and hydrogen peroxide in the leaching solution, which are introduced into the process in stages at a ratio of H2O2 :NaCN = 10:1. An enhancement of the process of geomaterial heap leaching using hydrogen peroxide enables a higher concentration of oxygen in the lower parts of the pile, which results in an increase in gold recovery by 7.6 % (from 79.5 % to 87.1 %) in comparison with the conventional process. The proposed method utilizing physico-chemical geotechnology of gold recovery ensures a sustainable use of the natural mineral resources, as well as a closed cycle of mining production.

中文翻译：

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使用含过氧化氢的试剂复合物增强金堆浸

该论文提供了通过使用含有过氧化氢的试剂复合物来增强金的堆浸 (HL) 过程的关键化学方面的理论依据。介绍了金属浸出过程中发生的多相催化反应的示意图，以及一些金簇的几何形状和离解能的例子。该论文提供了研究 Darasun 矿产生的各种废物的矿物成分的结果，包括 Talatuy 矿床的边界品位矿石（含金量 - 0.7 g/t）、Darasun 黄金加工厂的成熟尾矿(GPP)（金含量 — 1.45 g/t），以及 Darasun GPP 当前矿石加工的浮选尾矿（金含量 — 0.3 g/t）。提供了一个工艺流程图来描述从各种类型的采矿废料中获得的技术矿物颗粒中堆浸金的进行的实验研究。浸出过程使用含有氰化钠溶液和过氧化氢的试剂复合物进行，其作为化学反应的催化剂。已确定待造粒的地质材料必须满足的条件才能获得坚固的颗粒并能够浸出金。确定了以下关键工艺参数的最佳值：破碎的边界品位矿石的粒度；球团土料的废料部分（边界品位矿石：成熟尾矿：当前加工尾矿 = 1:0.5:0.5）；浸出液中氰化钠和过氧化氢的量，它们以 H2O2 : NaCN = 10:1 的比例分阶段引入过程中。使用过氧化氢对土工材料堆浸过程的改进使桩下部的氧气浓度更高，与传统方法相比，金回收率提高了 7.6%（从 79.5% 到 87.1%）过程。所提出的利用物理化学地质技术回收黄金的方法确保了天然矿产资源的可持续利用，以及采矿生产的封闭循环。1%) 与传统工艺相比。所提出的利用物理化学地质技术回收黄金的方法确保了天然矿产资源的可持续利用，以及采矿生产的封闭循环。1%) 与传统工艺相比。所提出的利用物理化学地质技术回收黄金的方法确保了天然矿产资源的可持续利用，以及采矿生产的封闭循环。