在定量研究硫脲（ＴＵ）法提取金银中硫脲、硫酸、氧化剂及添加剂的消耗基础上，考查体系中三价铁对硫脲的氧化还原反应过程、红外光谱分析流脲在矿物表面的吸附状态及杂质配位影响等硫脲的主要消耗夫向。探讨了消耗机理，提出了优化工艺。在不加氧化剂条件下，金的浸出率可达９８％以上，各试剂消耗可降到常规硫脲法的１／３到１／５以下。 Based on the quantitative study of thiourea (TU) extraction of thiourea, sulfuric acid, oxidant and additives in gold and silver, the redox reaction of trivalent iron to thiourea in the system was investigated. The adsorption of urea on the mineral surface was analyzed by infrared spectroscopy And the coordination of impurities such as the main consumption of thiourea husband. The mechanism of consumption is discussed, and the optimization process is proposed. In the absence of oxidants, the leaching rate of gold can reach more than 98%, the consumption of each reagent can be reduced to 1/3 to 1/5 of the conventional thiourea method.