论文部分内容阅读
一、前言 金、银在氰化物溶液中的溶解是一个电化学过程,可用下面(1)到(3)方程表述: Au+2CN~-=Au(CN)_2~-+e (1) Ag+2CN~-=Ag(CN)_2~-+e (2) O_2+4H~++4e=2H_2O (3) 一般金属在氰化物溶液中的溶解受多种因素的影响,诸如氰化物和金属浓度、pH值及电化学电位等。例如,根据现有的电化学研究,在低电位也即反应处在活化区时,金的阳极溶解速率随电位的增加而增大,而当电位达到某一值时,溶解速率明显减慢,即出现钝化。根据钝化理论,这种现象的出
I. Introduction The dissolution of silver and gold in cyanide solution is an electrochemical process and can be described by the following equations (1) to (3): Au + 2CN ~ - = Au (CN) 2 ~ + e (2) O 2 + 4H ~ + 4e = 2H 2 O (3) The dissolution of metal in cyanide solution is affected by many factors, such as cyanide and metal Concentration, pH and electrochemical potentials. For example, according to the existing electrochemical studies, the dissolution rate of gold increases with the increase of potential at low potential, that is, the reaction is in the activation zone. When the potential reaches a certain value, the dissolution rate slows down significantly, That is passivation. According to passivation theory, this phenomenon is out