氰化提金液中银离子选择电极的中毒及防止

游离氰浓度是氰化提金液的主要控制指标之一．用银离子选择电极监测金矿氰化液的游离氰其主要困难在于电极中毒．通过电子探针分析确定了中毒离子；对中毒原因进行热力学分析，证明了中毒的主要原因是Pb，Hg等重金属离子在膜表面的离子交换反应，并试验用掩蔽、离子交换、复活液、自动分析等手段减轻、消除中毒对电极的影响，使电极的寿命大大延长，据此研制了游离氰测定仪．

Silver Ion Selective Electrode Poisoning and Prevention in Cyanide Solution for Gold Extraction

The concentration of free cyanide is one of the main control indices for gold extraction liquid of cyanidation. Electrode poisoning is the main difficulty in free cyanide monitoring of cyanidation liguid with silver ion selective electrode. The poisoning ion is determined by electron probe analysis. The main poisoning cause is determined by thermodynamic method, which is the ion exchange reaction on the membrane of such heavy metal ions as Pb and Hg. Such means as masking, ion exchange, revivifier and automatic analysis are tested to reduce or eliminate the innunce of the poisoning over. electrode, which makes the life of electrode longer. Based on the above research, a detector for free cyanide is developed.