(中南大学 冶金与环境学院,长沙 410083)
摘 要: 采用电加强置换提镉新工艺从铜镉渣浸出液中直接提取海绵镉,以锌板为阳极、钛板为阴极,通过正交试验和单因素试验相结合的方法,考察温度、溶液pH、异极距、电流密度、阴阳极板面积比等因素对镉提取率的影响以及海绵镉的品位。结果表明:在温度为40 ℃、pH为1、异极距为5 cm、电流密度为200 A/m2、阴阳极板面积比为1:3的试验条件下,料液中镉提取率大于97%,所得海绵镉中镉品位大于85%,可直接用于压团制精镉。
关键字: 铜镉渣;浸出液;电加强置换;海绵镉
(School of Metallurgy and Environment, Central South University, Changsha 410083, China)
Abstract:Cadmium was extracted from the leaching solution of Cu-Cd slag by electrically enhanced replacement process using zinc plate as anode and titanium plate as cathode. The effects of process parameters, such as temperature, pH value, polar distance, current density and the electrode area ratio of cathode to anode on the cadmium extraction efficiency and the resultant sponge cadmium grade were investigated by orthogonal and single factor experiments. A maximum cadmium extraction rate of more than 97% and sponge cadmium grade of 85% were obtained under the optimized condition of temperature of 40 ℃, pH of 1, polar distance of 5 cm, current density of 200 A/m2, the electrode area ratio of cathode to anode of 1:3. The resultant sponge cadmium can be subjected to briquetting of fine cadmium directly.
Key words: Cu-Cd slag; leaching solution electrically; enhanced replacement; sponge cadmium