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在镍冶炼过程中产生大量的废水，其中含有镍、铜、钴等金属离子．这种冶炼废水在排放前必须加以处理，以便回收有价金属元素和防止污染环境．作者采用中和－混凝法处理镍冶炼废水，并对方法进行了热力学分析，对混凝机理进行了研究．理论计算结果表明：Ni2＋，CU2＋，Co2＋开始沉淀的pH值分别为7．47，6．00和7．68；若沉淀到1mg／L以下时，所控制的pH值分别为8．48，7．01和8．70．通过实验获得的最佳条件为：pH＝9．0，聚合硫酸铁用量为镍含量的2倍，聚丙烯酰胺用量为4mg／L；处理后，废水中ρNi＜0．13mg／L，ρCo＜0．01mg／L，ρCu＜0．005mg／L．
In the nickel smelting process produces large amounts of wastewater, which contains nickel, copper, cobalt and other metal ions. This smelting wastewater must be treated before discharge to recover valuable metal elements and prevent environmental pollution. The authors used neutralization - coagulation process nickel smelting wastewater, and the method of thermodynamic analysis of the coagulation mechanism was studied. The theoretical calculation results show that the pH values of Ni2 +, CU2 + and Co2 + start to precipitate are 7.47, 6.00 and 7.68, respectively. If the sedimentation below 1mg / L, the controlled pH values are 8.48 and 7 .01 and 8.70. The optimum conditions obtained through the experiment are as follows: the pH value is 9.0, the amount of polyferric sulfate is twice that of nickel and the amount of polyacrylamide is 4mg / L; after treatment, the ρNi in wastewater is less than 0.13mg / L, 0.01mg / L, ρCu <0.005mg / L.