Separation of copper from cobalt in sulphate solutions by using CaCO3

Xuewei Li, Zhiwu Lei, Jun Qu, Zhao Li, Qiwu Zhang

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


Lime neutralization is widely used to precipitate heavy metals including copper and cobalt from wastewater. Limestone (calcium carbonate: CaCO3) is too stable to be used directly for this purpose. Grinding of CaCO3 in the solutions of copper and cobalt sulphate was conducted to raise its reactivity. During the mechanochemical activation, CaCO3 reacted with copper sulphate but not significantly with cobalt sulphate and this phenomenon allowed an easy separation of copper from cobalt. The residual of Cu(II) ions in solution could be controlled at less than 0.1%, meanwhile more than 90% of the Co(II) ions remained in aqueous solution.

Original languageEnglish
Pages (from-to)2772-2779
Number of pages8
JournalSeparation Science and Technology (Philadelphia)
Issue number17
Publication statusPublished - 2016 Nov 21
Externally publishedYes


  • CaCO
  • cobalt
  • copper
  • mechanochemical activation
  • separation

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Process Chemistry and Technology
  • Filtration and Separation


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