Utilization of A. niger strains isolated from pistachio husk and grape skin in the bioleaching of valuable elements from red mud

Hossein Pedram, Mohammad Raouf Hosseini, Ataallah Bahrami

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

Due to the high heavy and rare element contents, bauxite residue rejects (red mud) are simultaneously an ecological hazard and economic virtue. The abilities of two strains of Aspergillus niger isolated from pistachio husk and grape skin were investigated in the bioleaching of metals from the red mud produced in the Iran Alumina Company. Citric acid secretion (~15 g/l) by both strains was ten times more than oxalic acid (~1.5 g/l) and kinetically obeyed the Luedeking-Piret model. Also, both Gompertz and logistic equations correlated with cell growth and substrate consumption. Considering the best results of the bioleaching experiments, the grape-skin strain extracted about 92% Al, 88% V, 67% Ti, 66% Sr, and 29% Sc from the activated residue; while, the metal recoveries by pistachio-husk strain were 53% Al, 31% V, 67% Ti, 44% Sr, and 38% Sc. Finally, according to the kinetic studies, the shrinking core model could perfectly simulate the process, and the product layer diffusion was determined as the rate-determining step.

Original languageEnglish
Article number105495
Number of pages12
JournalHydrometallurgy
Volume198
Early online date10 Oct 2020
DOIs
Publication statusPublished - 1 Dec 2020
Externally publishedYes

Bibliographical note




Publisher Copyright:
© 2020 Elsevier B.V.

Funder

The analyses of this study were funded by the Iranian Mines & Mining Industries Development & Renovation Organization (IMIDRO) .

Keywords

  • Aspergillus niger
  • Bauxite
  • Bioleaching
  • Kinetic
  • Organic acid
  • Red mud

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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