生物脱砷脱硫后金精矿的硫氰酸铵浸出试验

含砷难处理金精矿生物氧化预处理后，金精矿的金品位为87.23 g/t，经氧化脱砷脱硫后金精矿的矿物成分简单，对该金精矿样品进行硫氰酸铵浸出试验研究，通过不同氧化剂（次氯酸钙、高锰酸钾、硫酸铁）、氧化剂用量、浸出剂用量、浸出体系pH、浸出时间等条件进行试验，研究不同试验因素对硫氰酸铵浸出金的影响。在浸出体系pH小于2，浸出剂硫氰酸铵用量40 g/L，氧化剂硫酸铁的用量20 g/L，浸出时间5 h时，可获得金的浸出率为93.99%的良好指标。该氧化金精矿在常温常压下，采用硫氰酸铵浸出工艺是可行的。

Study on Ammonium Thiocyanate Leaching of Gold Concentrate after Biological Arsenic Removal and Desulfurization

After bio-oxidation pretreatment of arsenic-bearing refractory gold concentrate, gold grade in gold concentrate is 87.23 g/t. The mineral composition of gold concentrate is simple after oxidative dearsenization and desulfurization. The ammonium thiocyanate leaching experiment was carried out on gold concentrate sample. Effects of oxidants (calcium hypochlorite, potassium permanganate, ferric sulfate), oxidant dosage, leaching agent dosage, pH value of leaching system, and leaching time on gold leaching rate by ammonium thiocyanate were studied. The results show that gold leaching rate is 93.99% under the conditions including pH value of leaching system of below 2, dosage of leaching agent of ammonium thiocyanate of 40 g/L, dosage of oxidant of ferric sulfate of 20 g/L, and leaching time of 5 h. Ammonium thiocyanate leaching process is feasible for the oxidized gold concentrate at atmospheric pressure.