Removal of mercury from cyanide leach solution using potassium amyl xanthate (PAX)


Kantarcı S., ALP İ.

Separation and Purification Technology, vol.309, 2023 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 309
  • Publication Date: 2023
  • Doi Number: 10.1016/j.seppur.2022.123036
  • Journal Name: Separation and Purification Technology
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Biotechnology Research Abstracts, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, INSPEC, Metadex, Pollution Abstracts, Civil Engineering Abstracts
  • Keywords: Gold, Amalgamation, Cyanidation, Mercury, Precipitation, SULFIDE PRECIPITATION, SELECTIVE REMOVAL, STARCH XANTHATE, WASTE-WATER, GOLD, ADSORBENTS, SOLUBILITY, SPECIATION, HGS
  • Karadeniz Technical University Affiliated: Yes

Abstract

© 2022 Elsevier B.V.The dissolution of mercury during cyanide leaching of Hg-containing gold ores and amalgamation tailings cause many environmental, health and operational problems. For this reason, mercury removal is a very important factor in the economic and environmental selection of the separation method. In this study, the use of potassium amyl xanthate (PAX) as precipitation reagents in the removal of mercury-cyanide complexes from synthetic solutions containing gold, silver and mercury has been investigated. The effect of reaction time, PAX:Hg molar ratio, pH, temperature, CN concentration and Cu concentration on the precipitation of mercury was explored using synthetic mercury-cyanide solutions. Detailed characterization of precipitates was performed using SEM EDS, XRD, FT-IR and particle size analysis. The results of this study illustrate that the precipitant dosage, initial concentrations, pH and temperature were quite effective on the Hg removal efficiency. The best Hg removal efficiency was obtained of 99.2 % at 44.7 °C. The Hg concentration was reduced from 10000 ppb to 72 ppb. As a result of characterization tests, it has been determined that highly stable metacinnabar (β-HgS) is formed as precipitate. The findings showed that PAX is an effective reagent for the selective precipitation of mercury from cyanide leaching solutions.