This research improves the gold recovery from dump tailings employing the Carbon in Leach (CIL) process and using thiourea as a gold lixiviant. The integration of sulfur dioxide in the CIL process, utilizing a Hydrodynamic Cavitation (HC) reactor, was explored to mitigate the pronounced consumption of thiourea. The HC reactor was found to catalyze the generation of OH radicals via hydrodynamic cavitation, acting as a robust oxidizing agent. A comprehensive examination revealed the impact of the inlet pressure of pulp in the HC reactor, temperature, and iron(III) sulfate concentration on the oxidoreduction potential (ORP) within the CIL process with supplied SO. We have found that under specific parameters -including the initial concentration of HSO, thiourea loading, coal loading, SO supply, inlet pressure of pulp supply to the HC reactor, and the CIL processing time - a substantial degree of gold recovery is achievable. Particularly, with a thiourea consumption of 0.57 kg/t and sulfur dioxide at 8 kg/t, gold recovery peaked at 93.5%.

中文翻译：

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二氧化硫作为碳浸（CIL）工艺中的硫脲稳定剂，使用水力空化反应器从尾矿中回收金

这项研究采用碳浸出 (CIL) 工艺并使用硫脲作为金浸出剂，提高了尾矿中金的回收率。探索了利用水力空化 (HC) 反应器将二氧化硫整合到 CIL 工艺中，以减少硫脲的明显消耗。研究发现，HC 反应器可通过水力空化作用催化 OH 自由基的产生，充当强氧化剂。全面检查揭示了 HC 反应器中纸浆入口压力、温度和硫酸铁 (III) 浓度对供应 SO 的 CIL 工艺中氧化还原电位 (ORP) 的影响。我们发现，在特定参数下，包括 HSO 的初始浓度、硫脲负载、煤炭负载、SO 供应、HC 反应器的矿浆供应入口压力以及 CIL 处理时间，可以实现相当程度的金回收。其中，硫脲消耗0.57千克/吨，二氧化硫消耗8千克/吨，金回收率最高达到93.5%。