Sequential pretreatment of double refractory gold ore (DRGO)with a thermophilic iron oxidizing archeaon and fungal crude enzymes

Kojo T. Konadu, Robert J. Huddy, Susan T.L. Harrison, Kwadwo Osseo-Asare, Keiko Sasaki

研究成果: Contribution to journalArticle査読

11 被引用数 (Scopus)

抄録

Double refractory gold ore was sequentially pretreated to oxidize sulfides by thermophilic archaeon Acidianus brierleyi and then to decompose carbonaceous matters using the cell-free spent medium (CFSM)from white-rot fungus Phanerochaete chrysosporium. The pretreatment by A. brierleyi significantly improved the gold recovery from 25% to 77%. Additionally, the crude lignin-degrading enzymes in the CFSM converted the carbonaceous matters into more easily degradable substances, which were removed by alkaline washing, leading to a final gold recovery of 92%. These mineralogical alterations were confirmed by differential thermogravimetric analysis and quantitative evaluation of minerals with scanning electron microscopy. Based on the results, gold grains were mostly liberated after bio-oxidation of sulfides, and in following CFSM treatment, large particles of carbonaceous aluminosilicate were formed from the aggregation of clay minerals, gold grains and with partially decomposed carbonaceous matters acting as binders.

本文言語英語
ページ(範囲)86-94
ページ数9
ジャーナルMinerals Engineering
138
DOI
出版ステータス出版済み - 7 2019

All Science Journal Classification (ASJC) codes

  • 制御およびシステム工学
  • 化学 (全般)
  • 地盤工学および土木地質学
  • 機械工学

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