Purification of Nickel Sulfate by Batch Cooling Crystallization

Research output: Contribution to conferencePaperScientific


Cooling crystallization was successfully carried out in a batch cooling crystallizer
from impure acidic solutions to recover nickel as nickel sulfate salt with three different cooling rates. The compositions of the solutions included impurities of sodium, magnesium, chloride and sulfuric acid in order to mimic industrial electrowinning process solutions. The results show that nickel sulfate hexahydrate (NiSO4·6H2O) mainly crystallized and its solubility and purity decreased with the increase in mass ratio of chloride to sulfate. Cooling rates did not have significant influence of crystal purity, however, it did affect the filter cake moisture. Lower moisture can be obtained with lower cooling rate.
Original languageEnglish
Number of pages6
Publication statusPublished - 2018
MoE publication typeNot Eligible
EventInternational Workshop on Industrial Crystallization - University of Rouen Normandy , Rouen, France
Duration: 5 Sept 20187 Sept 2018
Conference number: 25


WorkshopInternational Workshop on Industrial Crystallization
Abbreviated titleBIWIC
Internet address


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