改性花生壳吸附分离湿法炼锌溶液中的镓和锗

Separation of Ga and Ge from leachate in zinc hydrometallurgy by modified peanut shells adsorption

研究酒石酸改性花生壳对湿法炼锌浸出液中镓和锗的吸附过程,考察吸附时间、改性花生壳的用量、溶液初始pH值、吸附温度以及溶液中镓、锗初始浓度对镓、锗吸附率的影响,并探讨了花生壳吸附镓、锗动力学。结果表明:改性花生壳可实现湿法炼锌浸出液中镓和锗的有效分离,且对锗的吸附效果优于镓,在吸附时间为3 h、溶液初始pH=3、吸附温度为30℃的条件下,锗的吸附率大于99%。镓、锗在改性花生壳上的吸附过程可用准二级动力学方程描述;改性花生壳对镓、锗的吸附等温线符合朗格缪尔(Langmuir)模型,镓、锗的饱和吸附量分别为2.77、3.03 mg/g。吸附镓、锗的改性花生壳可用H_(2)SO_(4)溶液解吸再生,可循环利用。

The adsorption of Ga and Ge from zinc hydrometallurgy leachate by tartaric acid modified peanut shell was studied,with the effects of adsorption time,amount of modified peanut shell,initial pH value,adsorption temperature and initial concentration of Ga and Ge on the adsorption rate of Ga and Ge investigated and the kinetics of adsorption of Ga and Ge on peanut shell discussed.The results showed that the modified peanut shell could effectively separate Ga and Ge from zinc hydrometallurgy leachate,and the adsorption efficiencies of Ge were significantly higher than that of Ga.The adsorption of germanium was above 99%with initial pH of 3 at 30℃within 3 h.The adsorption kinetics of Ga and Ge could be described by the pseudo-second-order model.The adsorption equilibrium of Ga and Ge by modified peanut shells was in accordance with Langmuir model.According to Langmuir equation,the maximum adsorption capacities of modified peanut shells for Ga and Ge were respectively 2.77 and 3.03 mg/g.The modified peanut shells that have adsorbed Ga and Ge could be desorbed and regenerated with H_(2)SO_(4) solution,and then recycled.