(中南大學(xué) 冶金與環(huán)境學(xué)院，長沙 410083)
摘 要: 采用高溫焙燒、硫脲-硫氰酸鈉浸出難處理金礦中的金，研究焙燒溫度、硫氰酸鈉濃度、硫脲(Tu)濃度、Fe3+濃度、pH值、浸出溫度和時間對金浸出率的影響，得到混合體系浸金的最優(yōu)條件，并研究浸出過程中硫氰酸鈉和硫脲的穩(wěn)定性。結(jié)果表明：金的浸出率達(dá)到93.1%，超過相同條件下單一體系中的浸出率之和，硫脲與硫氰酸鈉摩爾比對金浸出率和金電極穩(wěn)定電位影響較大；硫氰酸鈉使硫脲的穩(wěn)定性降低，而硫脲使硫氰酸鈉的穩(wěn)定性增強(qiáng)。
關(guān)鍵字: 難處理金礦；硫脲；硫氰酸鈉；浸出劑
（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
