Purification of Nickel Sulfate by Batch Cooling Crystallization

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2019-07-01
Major/Subject
Mcode
Degree programme
Language
en
Pages
6
1475-1480
Series
Chemical Engineering and Technology, Volume 42, issue 7
Abstract
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.
Description
"HUOM! TÄMÄn MANUSKAn EMBARGO ON YLIPITKÄ KUNNES ARTIKKELI ON JULKAISTU JA JULKAISUVIIVE MÄÄRITELTY KUSTANTAJAN JULKAISUPÄIVÄSTÄ ALKAEN. The manuscript's embargo is very long until the article has been published and the embargo date can be defined."
Keywords
Batch cooling crystallization, Impurity, Nickel sulfate, Purification
Other note
Citation
Han , B , Bøckman , O , Wilson , B P , Lundström , M & Louhi-Kultanen , M 2019 , ' Purification of Nickel Sulfate by Batch Cooling Crystallization ' , Chemical Engineering and Technology , vol. 42 , no. 7 , pp. 1475-1480 . https://doi.org/10.1002/ceat.201800695