Impact of resins packed in electrode compartments on concentrating NiSO4 solution by electrodeionaization(EDI)
极水室填充树脂对电去离子过程浓缩低浓度NiSO4溶液的影响

With feed water of low concentration NiSO4 solution,the influences on the stack resistance,limiting current and the variation of the out electrode water pH were investigated.The EDI separation properties were also inspected.The results show that the limiting voltage increased from 6V to 10V after packing resins in the electrode compartments,and the corresponding limiting current increased from 0.213 A to 0.421 A.With feed Ni2+ concentration of 50 mg/L,the Ni2+ concentration of out concentrate could reach 14 224 mg/L,which gave the concentrating ratio of 280.The out dilute Ni2+ concentration was as low as 3.45 mg/L,with the nickel removal rate of 93%.It was found that the EDI process could be operated with good stability and without Ni(OH)2 precipitation.