Abstract

Tajikistan has a large volume of gold-containing dumps, which on conversion to gold equals ~18 t. These dumps are products of amalgamation and cyanidation processes, resulting from treating the ores from Tarorskoe, one of the largest deposits in Tajikistan, and from a few other nearby deposits: Dzhilau, Khirskhon, and Olimpiiskoe. The mineralogical composition of the dumps is represented primarily by quartz, feldspar, and clay minerals. Their average content of gold is rather high, 2.4 g/t. Therefore, it is expedient to treat the dumps on the premises of JV Zerafshan plant (in the city of Pendzhikent, Tajikistan), which processes ores of the Tarorskoe deposit and has an unloaded technological cycle. The treatment of these dumps does not require an ore pretreatment stage, since, for the actual grain-size class (–0.074 mm, 58.11%), the content of cyanided gold is 89.7%. This work presents the results of studying the extraction of gold from the dumps by thiourea leaching. The purpose of this work is to find ways to decrease the consumption of expensive reagent thiourea. It is found that the sample of the dumps contains sorption-active minerals, which lead to the loss of gold with tails. Therefore, it is suggested that raw material should undergo a preliminary acid treatment to reduce the consumption of thiourea and sodium sulfite should be added to the pulp during carbon in thiourea leach. A high degree of extraction (~89%) is achieved when thiourea is loaded in the amount of 2 kg/t, ferric sulfate 7 kg/t, sodium sulfite 12 kg/t, and the initial concentration of sulfuric acid of 0.5% (at the stage of acid treatment). In this case, the consumption of thiourea is 0.8 kg/t. A process flow diagram for the dump treatment is proposed, which includes the following operations: preliminary acid treatment, carbon in thiourea leach, desorption, reactivation, electrolysis, and melting.

中文翻译：

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硫脲浸出法从成熟转储物中提取金的技术

摘要

塔吉克斯坦有大量的含金垃圾场，转换为黄金时约等于18吨。这些堆场是汞合金和氰化过程的产物，其处理来自塔里克斯坦最大的矿床之一塔罗斯科的矿石，以及附近的其他几处矿床：Dzhilau，Khirskhon和Olimpiiskoe。垃圾场的矿物成分主要由石英，长石和粘土矿物组成。它们的平均金含量很高，为2.4克/吨。因此，在合资的Zerafshan工厂（塔吉克斯坦Pendzhikent市）的厂内处理垃圾是很方便的，该厂处理Tarorskoe矿床，并具有空载技术周期。这些垃圾场的处理不需要矿石预处理阶段，因为对于实际的粒度级别（–0.074毫米，58.11％），氰化金含量为89.7％。这项工作提出了研究通过硫脲浸出从垃圾场中提取金的结果。这项工作的目的是寻找减少昂贵试剂硫脲消耗量的方法。发现垃圾场样品中含有吸附活性矿物质，这会导致带有尾巴的金矿流失。因此，建议对原料进行初步的酸处理以减少硫脲的消耗，并且在硫脲浸出过程中的碳中应在纸浆中加入亚硫酸钠。当硫脲的添加量为2 kg / t，硫酸铁为7 kg / t，亚硫酸钠为12 kg / t且硫酸的初始浓度为0.5％（〜89％）时，可实现较高的萃取率（〜89％）。在酸处理阶段）。在这种情况下，硫脲的消耗量为0.8 kg / t。