(中南大學 冶金與環(huán)境學院，長沙 410083)
摘 要: 采用電加強置換提鎘新工藝從銅鎘渣浸出液中直接提取海綿鎘，以鋅板為陽極、鈦板為陰極，通過正交試驗和單因素試驗相結合的方法，考察溫度、溶液pH、異極距、電流密度、陰陽極板面積比等因素對鎘提取率的影響以及海綿鎘的品位。結果表明：在溫度為40 ℃、pH為1、異極距為5 cm、電流密度為200 A/m2、陰陽極板面積比為1:3的試驗條件下，料液中鎘提取率大于97%，所得海綿鎘中鎘品位大于85%，可直接用于壓團制精鎘。
關鍵字: 銅鎘渣；浸出液；電加強置換；海綿鎘
（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
