Extraction of chloride from slag flush wastewater using solvent N235

Jiashu Yao, Yali Li, C. Srinivasakannan, Jianfeng Ran, Shiwei Li, Shaohua Yin, Libo Zhang

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


This work proposes a solvent extraction process for removal of chloride in slag flush wastewater using tri-n-octylamine (N235) as extractant. The single stage extraction and stripping efficiencies were 78.9% and 99.2% respectively under the optimal conditions. The McCabe-Thiele diagram and Kremser equation were utilized to predict the number of stages required to reduce the Cl concentration to less than 350 mg/L. The results were authenticated utilizing a three-stage counter-current operation, that closely correspond the estimates of McCabe-Thiele diagram. The FT-IR spectra of organic phases indicate that the extractant N235 combines with H2SO4 first to form quaternary ammonium salt containing N-H+ after acidification by H2SO4, followed by an anionic exchange with Cl. Further, the raffinate phase was stripped using a suitable stripping agent to increase the Cl concentration up to 100,000 mg/L so as to facilitate precipitation of NaCl by addition of NaOH as salting-out agent. The XRD analysis was utilized to confirm the crystallinity and the purity of the precipitated NaCl.

Original languageBritish English
Article number105934
StatePublished - Aug 2022


  • Chloride
  • N235
  • Solvent extraction
  • Stripping


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