(中南大学 冶金与环境学院，长沙 410083)
摘 要: 采用高温焙烧、硫脲-硫氰酸钠浸出难处理金矿中的金，研究焙烧温度、硫氰酸钠浓度、硫脲(Tu)浓度、Fe3+浓度、pH值、浸出温度和时间对金浸出率的影响，得到混合体系浸金的最优条件，并研究浸出过程中硫氰酸钠和硫脲的稳定性。结果表明：金的浸出率达到93.1%，超过相同条件下单一体系中的浸出率之和，硫脲与硫氰酸钠摩尔比对金浸出率和金电极稳定电位影响较大；硫氰酸钠使硫脲的稳定性降低，而硫脲使硫氰酸钠的稳定性增强。
关键字: 难处理金矿；硫脲；硫氰酸钠；浸出剂
（School of Metallurgy and Environment, Central South University, Changsha 410083, China）
Abstract:Gold was extracted from refractory gold ore using a process of roasting followed by thiourea-thiocyanate leaching. The effects of roasting temperature, initial concentrations of thiocyanate, thiourea and ferric as well as pH value, leaching temperature and time on the leaching rate of gold were investigated. The results show that the gold leaching rate is 93.1% under the optimum conditions, and the leaching rate in mixed system is greater than the sum of leaching rate in solutions with each individual lixiviant. The mole ratio of thiourea to thiocyanate has significant influence on the leaching rate of gold and open potential. Thiocyanate accelerates the decomposition of thiourea whereas thiourea alleviates the decomposition of thiocyante.
Key words: refractory gold ore; thiourea; thiocyanate; lixiviant
