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采用酸浸和对环境友好的除杂方法处理锌冶炼烟尘回收提取高纯镉。结果表明,其最佳条件如下:硫酸浓度90 g/L、液固比6:1、反应温度60°C、浸出时间1.0 h,此条件下镉的浸出率达95.8%。采用Fe Cl3沉淀生成Fe AsO 4和Fe(OH)3来分离重金属和砷,当n(Fe)/n(As)为3:1、p H=6.0时,铁、铅和铜的去除率均超过98.9%,砷的去除率为99.6%。P204用于锌和镉的溶剂萃取分离,最佳萃取条件如下:P204浓度20%(体积分数,室温下用煤油稀释)、p H=3、相比O/A=1:1。在此条件下,锌的萃取率为99.2%。当还原温度为310°C时,镉粉的形貌为均匀球形,晶体结构为立方晶体,得到的镉粉纯度超过99.99%。
Adopting acid leaching and environment-friendly impurity removal method to treat zinc smelting soot and recover high purity cadmium. The results showed that the optimal conditions were as follows: sulfuric acid concentration 90 g / L, liquid-solid ratio 6: 1, reaction temperature 60 ° C, and leaching time 1.0 h. Under these conditions, the leaching rate of cadmium reached 95.8%. Fe AsO 4 and Fe (OH) 3 were precipitated by FeCl3 to separate heavy metals and arsenic. The removal rates of iron, lead and copper were both 3: 1 for n (Fe) / n More than 98.9%, arsenic removal rate of 99.6%. P204 is used for solvent extraction of zinc and cadmium. The optimum extraction conditions are as follows: P204 concentration 20% (volume fraction, diluted with kerosene at room temperature), p H = 3, O / A = 1: 1. Under these conditions, the zinc extraction rate was 99.2%. When the reduction temperature is 310 ° C, the morphology of the cadmium powder is uniform and spherical, the crystal structure is cubic crystal, and the purity of the obtained cadmium powder is over 99.99%.