摘要
为了提高难处理含金硫精矿中金的浸出率,采用同步热分析仪研究在马弗炉中焙烧氧化难处理含金硫精矿的最佳条件,通过优化实验确定硫代硫酸盐浸出的最佳工艺参数。结果表明:在马弗炉中焙烧氧化难处理含金硫精矿最佳条件为在700℃温度下焙烧2 h,难处理含金硫精矿硫的去除率可达94.7%。焙烧后,金的浸出率大幅度提高。使用组成为0.03 mol/L CuSO4、1.0 mol/L NH3·H2O、0.3 mol/L Na2S2O3、0.1 mol/L(NH4)2SO4和0.3 mol/L Na2SO3的硫代硫酸盐溶液作为浸出剂,最佳浸出工艺参数如下:浸出时间18 h、液固比2:1、振荡速度250 r/min、浸出温度50℃。在此浸出工艺参数下,金浸出率达71.2%。
In order to increase the leaching rate of gold from refractory gold-bearing sulfur concentrates the synchronous thermal analyzer was adopted to study the best condition of roasting and oxidizing refractory gold-bearing sulfur concentrates in the muffle, and the optimum technological parameters of thiosulfate leaching were ascertained through optimal experiment. The results show that the best conditions of roasting and oxidizing refractory gold-bearing sulfur concentrates are as follows： roasting in the muffle at 700 ℃ for 2 h with 94.7% removal rate of sulfur. After the roasting and oxidizing, the gold leaching rate increases substantially. The leaching rate of gold reaches 71.2% at the optimal leaching technological parameters of the leaching time 18 h, ratio of liquid to solid 2：1, oscillating speed 250 r/min, leaching temperature 50 ℃ when leaching lixiviation is composed of 0.03 mol/L CuSO4, 1.0 mol/L NH3？H2O, 0.3 mol/L Na2S2O3, 0.1 mol/L （NH4）2SO4 and 0.3 mol/L Na2SO3.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2014年第3期831-837,共7页
The Chinese Journal of Nonferrous Metals
基金
湖南省自然科学省市联合基金资助项目(12JJ8008)
关键词
难处理含金硫精矿
金
硫代硫酸盐
浸出
焙烧
氧化
refractory gold-bearing sulfur concentrates
gold
thiosulfate
leaching
roasting
oxidation
