Abstract:Effect of ultrasound on stability of copper ammonia sodium thiosulfate leaching gold system was explored. Changes of thiosulfate ion concentration and Cu(NH3)42+ complex ion concentration in gold leaching system under different conditions of leaching time, temperature, ultrasonic power, pH value and ammonia concentration were investigated. The results show that ultrasonic effect reduces stability of thiosulfate gold leaching system, and can significantly promote decomposition of thiosulfate ion and Cu(NH3)42+ complex ion concentration under certain conditions. Gold ore leaching test shows that when concentration of Na2S2O3 is 0.1 mol/L, concentration of CuSO4 is 0.03 mol/L, and concentration of NH3?H2O is 0.45 mol/L, ultrasonic effect can significantly increase gold leaching rate. and it is introduced. With aid of ultrasound, conventional higher temperature leaching effect can be achieved at lower temperature. This study opens a new research path for reducing temperature of thiosulfate leaching gold reaction.