【摘要】 针对某冶炼厂氧化钴生产车间产生的废水,研究了氨对其溶液化学性质的影响,提出了采用该冶炼厂的贵金属生产车间的碱洗废水作硫化沉淀剂,联合混凝法的处理工艺方案。研究结果表明,当氧化钴生产废水与贵金属生产废水混合比例控制在10∶1以下时,不需添加硫化钠就能使废水中重金属达标排放;当比例在10∶1以上时,需添加额外的硫化钠;影响重金属残余浓度因素由大到小的顺序为:硫化钠用量、液体聚合硫酸铁用量、pH值;废水中重金属能达标排放的最佳试验方案为:硫化钠添加量为0.146g/L,液体聚合硫酸铁用量为1.596g/L,pH值控制在7.0。更多还原

【Abstract】 Treatment of waste water raised from powder blue production was investigated in this paper. The dosage of alkali used to adjust pH was given, and the influence of NH₃ on solution chemistry was studied. The scheme of sulphur-precipitation coagulation was carried through the mix of the waste water raised from noble metal production. The results show that when the mix is below 10∶1 between waste water raised from powder blue production and from noble metal production, it’s no need to add Na₂S to make waste water in fit with national drainage standards; but it needs to add Na₂S if the mix is above 10∶1. The orthogonal experiment results show that the residual heavy metal is affected by dosage of Na₂S, dosage of PFS, and pH, respectively in a desending order, and when Na₂S dosage is 0.146 g/L and PFS dosage is 1.596 g/L at pH 7.0, the content of heavy metal in waste water can fit with that of national drainage standards.更多还原