碳质银精矿氯化浸出工艺的研究与应用

Study and application of chloride leaching technique in carbonaceous silver concentrate

采用氧化焙烧工艺对碳质银精矿进行除碳、除硫预处理,试验确定焙烧温度为650℃。焙砂以3YL--NaCl无氰氯化体系浸出,研究了影响氯化浸出的因素:3YL用量、氯化钠浓度、浸出酸度、时间、温度℃及固液比等,并在试验确定的工艺条件下,进行了公斤级试验,得出Au、Ag、Cu、Pb、Zn的氯化浸出率分别为95.1%、91.6%、85.7%、95.2%、83.8%。

Decarbonization and desulphurization pretreatments of carbonaceous silver concentrate have been done by oxidation roasting with temperature of 650 ℃. Calciner was leached by 3YL--NaCl cyanide free chloride system,and the influence factors of chloride leaching were 3YL dosage,NaCl concentration,leaching acidity, leaching time,leaching temperature and solid to liquid ratio. The Kg experiments under certain technical conditions show the chloride leaching rates of Ag,Au,Cu,Pb and Zn are 95. 1% ,91. 6% ,85. 7% ,95. 2% and 83. 8% , respectively.