SELECTIVE RECOVERY OF SILVER FROM AN ACIDIC SOLUTION BY CEMENTATION WITH COPPER
来源期刊：中南大学学报(英文版)1998年第2期
论文作者：Yang Yongbin Jiang Tao Fu Ganghua He Boquan Huang Zhucheng
文章页码：40 - 43
Key words：extraction; cementation; silver
Abstract: An acidic solution containing 280 mg/l silver and others was treated. In order to selectively recover silver without losing other metallic elements from the solution, cementation was adopted with metallic copper. The kinetics of cementation reaction and copper dissolution and mechanism of copper consumption were studied. The results indicated that the rate of cementation reaction and copper consumption were markedly increased with the increase of temperature. For the same cementation recovery of silver , copper consumption at elevated temperature was much higher than that at ambient temperature . Cementation rate and copper consumption rate also increased with the increase of stirring velocity, while copper consumption at different stirring velocity for the same recovery of silver was almost not different. Studies on the chemical mechanism of copper consumption showed that Fe3+ and residual leaching additive RH in the solution were the main factors that caused extra copper consumption in acidic solutions.
