摘要
利用配位化学理论,研究了pH值、亚硫酸钠浓度、氯离子浓度对亚硫酸钠浸出氯化银的影响。结果表明:pH值的增大和亚硫酸钠浓度的提高,使与银配位的亚硫酸根离子增多,从而氯化银的溶解度明显提高;在亚硫酸钠循环浸出氯化银的过程中,溶液中不断积累的氯离子导致浸银效果逐渐变差。结合工业生产,确定了亚硫酸钠浓度为2mol/L,控制每次浸出液中银的浓度为30g/L时,亚硫酸钠溶液可以循环浸出氯化银11次。
The influences of pH value, concentrations of sodium sulfite and chloride ion on leaching of silver chloride by sodium sulfite were studied based on coordination equilibrium, The results show that sulfite ion increases with pH value and concentration of sodium sulfite, which results in the increase of solubility of silver chloride. In the circular leaching solution, the solubility of silver chloride becomes lower with the increase of concentration of chloride ion. In industrial production, the solution can circularly leach silver chloride 11 times when the concentration of sodium sulfite is 2mol/L and the concentration of silver ion is 30g/L after every leaching process.
出处
《贵金属》
CAS
CSCD
2007年第3期10-14,共5页
Precious Metals
关键词
湿法冶金
氯化银
亚硫酸钠
pH
氯离子
浸出
hydrometallurgy
silver chloride
sodium sulfite
pH
chloride ion
leaching
