处理湿法炼锌净化渣-钴镍渣的试验研究

【作者】 刘春侠；

【导师】 谢刚；

【作者基本信息】 昆明理工大学 ， 有色金属冶金， 2005， 硕士

【摘要】 为了综合回收湿法炼锌净化钴镍渣中的有价金属,基于对标准状态下Me-H₂O（Me:Zn,Cd,Fe,Mn,Co,Ni）系E-pH图,Co-Sb-H₂O系E-pH图和氧化剂电位比较图的热力学分析,通过实验研究,提出了处理钻镍渣的系统工艺,探讨了影响各工序的因素,得出了各工序的最佳工艺条件。具体条件如下: （1）浸出:选用硫酸为浸出剂。最佳工艺条件为:液固比2.5:1,温度80℃,硫酸用量为理论量1.4倍,浸出时间80 min。在此条件下,Zn,Cd,Co,Ni的浸出率分别为98%,99%,99%,98%以上。 （2）净化除镉:选用锌粉为还原剂。最佳工艺条件为:一段:50℃,锌粉用量为理论量0.8倍,搅拌时间40 min;二段:45℃,锌粉用量为理论量（按浸出液计算）0.6倍,搅拌时间40 min。Cd的置换率达99%,Co和Ni的损失率分别小于10%和15%。 （3）氧化沉钴:选用过硫酸钠为氧化剂。最佳工艺条件为:80℃,过硫酸钠为理论量8倍,氢氧化钠调节pit=5.0～5.2,搅拌时间2h。在此条件下渣中钴的含量为18.037%,可以作为富钴渣进一步提钻并制取钻产品,镍的损失率很小,渣中含镍只有0.093%。 （4）净化除镍:选用锌粉为还原剂,Sb₂O₃,CuSO₄为添加剂。最佳工艺条件为:80℃,Sb₂O₃,CuSO₄50mg/L,锌粉用量为理论量40倍,稀硫酸调节pH=4.0左右,搅拌时间3h。在此条件下渣中镍的含量为4.916%,可以作为富镍渣进一步提镍并制取镍产品。更多还原

【Abstract】 A systematic process of treating with Co-Ni residue from zinc hydrometallurgy has been developed. It based on the thermodynamic analyses of E-pH equilibrium diagrams and experiments. The process consists of the following major unit operations:（1） Leaching: Sulfuric acid was used as leaching agent. The optimum technology condition was: L/S ratio of 2.5:1, 80℃,80 min, sulfuric acid dosage of 1.4 times theoretic dosage. On this condition, the leaching rate of metals were: Zn>98%, Cd>99%,Co>99%,Ni>98.（2） Purification of cadmium: Zinc dust was used as reducing agent. The optimum technology condition was: the first stage, 50℃, 40 min, zinc dust dosage of 0.8 times theoretic dosage, the second stage, 45 ℃ , 40 min, zinc dust dosage of 0.6 times theoretic dosage. On this condition, the replacing rate of metals were: Cd>99%, Co<10%.Ni<15%.（3） Purification of cobalt: Na₂S₂O₈ was used as oxidant. the optimum technology condition was: 80℃ , 2h, Na₂S₂O₈ dosage of 8 times theoretic dosage, pH=5.0⁵.2. On this condition, cobalt content was 18.037% and nickel content was 0.093% in purification residue.（4） Purification of nickle: Zinc dust was used as reducing agent, Sb₂O₃ and CuSO₄ were used as activated agents. The optimum technology condition was: 80℃, 3h, Sb₂O₃50mg/L,CuSO₄50mg/l, zinc dust dosage of 40 times theoretic dosage, pH=4.0. On this condition, nickel content of residue was 4.916% .更多还原