Comparison of chemical and biological leaching of sulfide tailings

Jari Aromaa (Corresponding Author), Jarno Mäkinen, Henri Vepsalainen, Tommi Kaartinen, Margareta Wahlström, Olof Forsen

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)

Abstract

Sulphidic tailings from Finnish Hitura nickel mine and Pyhäsalmi multi-metal mine were leached using sulphuric acid and bioleached. The aim was to recover minor amounts of valuable Cu, Ni,Zn and Mn. Both tailings consisted mainly of iron and magnesium-containing minerals and acid neutralizing minerals. The solution after chemical leaching tests contained mostly iron and magnesium, in
Hitura up to 11 g/dm3 Fe and 38 g/dm3 Mg while in Pyhäsalmi 8–9 g/dm3 Fe and 4 g/dm3 Mg. Amount of these metals was 20–100-fold larger than amount of valuable metals, which were typically 100-300 mg/dm3. Problems in chemical leaching were high consumption of acid and poor selectivity. Bioleaching using iron and sulphur oxidizing bacteria was more selective towards the valuable metals. Both in leaching and bioleaching the high concentration of iron and magnesium in solution will make metals recovery challenging.
Original languageEnglish
Pages (from-to)607-620
Number of pages13
JournalPhysicochemical Problems of Mineral Processing
Volume49
Issue number2
DOIs
Publication statusPublished - 2013
MoE publication typeA1 Journal article-refereed

Keywords

  • sulfide tailings
  • chemical leaching
  • bioleaching
  • selectivity

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