树脂吸附柠檬酸盐-硫代硫酸盐浸出液中的银

铜-柠檬酸盐-硫代硫酸盐溶液是一种具有应用潜力的绿色浸金体系。研究了利用D301离子交换树脂从柠檬酸盐-硫代硫酸盐溶液中吸附银络合物的工艺可行性。考察了溶液pH、柠檬酸盐和硫代硫酸盐浓度及硝酸根对银吸附效果的影响。结果表明，硫代硫酸银络合物树脂吸附为均匀位点的单层吸附，符合准二级吸附动力学。柠檬酸和硝酸根均抑制树脂对硫代硫酸银离子的吸附，当溶液pH大于12时，D301树脂对硫代硫酸银离子的吸附容量急剧降低。研究结果明确了吸附过程的控速步骤及主要影响因素，为进一步实现硫代硫酸盐-柠檬酸溶液中的重贵金属回收提供了理论和技术基础。

Resin Adsorption of Silver in Citrate-Thiosulfate Leaching Solution

Copper-citrate-thiosulfate solution is a green gold leaching system with potential application. Technological feasibility of adsorbing silver complex from citrate-thiosulfate solution with D301 ion exchange resin was studied. Effects of pH value of solution, concentration of citrate and thiosulfate, and nitrate on silver adsorption were investigated. The results show that adsorption of silver thiosulfate complex in resin is monolayer adsorption with uniform site, which conforms to the quasi-second-order adsorption kinetics. Both citric acid and nitrate inhibite the adsorption of silver thiosulfate ions. When the pH value of solution is greater than 12, the adsorption capacity of D301 resin for silver thiosulfate ions drops sharply. The results show that the speed control steps and the main influencing factors of the adsorption process are clear, which provides a theoretical and technical basis for the recovery of heavy metals and precious metals from thiosulfate-citric acid solution.