Purification of Nickel Sulfate by Batch Cooling Crystallization

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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 to mimic industrial nickel electrowinning process solutions. The results show that NiSO 4 ·6H 2 O mainly crystallized, and its solubility and purity decreased with the increase in the mass ratio of chloride to sulfate. Cooling rates did not have a significant influence on crystal purity; however, it did affect the filter cake moisture; lower moisture can be obtained with a lower cooling rate. The sequence of impurity removal efficiency from high to low was Cl > Na > Mg.

Original languageEnglish
Pages (from-to)1475-1480
Number of pages6
JournalChemical Engineering and Technology
Issue number7
Publication statusPublished - 1 Jul 2019
MoE publication typeA1 Journal article-refereed
EventInternational Workshop on Industrial Crystallization - University of Rouen Normandy , Rouen, France
Duration: 5 Sep 20187 Sep 2018
Conference number: 25


  • Batch cooling crystallization
  • Impurity
  • Nickel sulfate
  • Purification


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