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Biodesulfurization of vanadium-bearing titanomagnetite concentrates and pH control of bioleaching solution

  • Xiao-rong Liu
  • Sheng-cai Jiang
  • Yan-jun Liu
  • Hui Li
  • Hua-jun Wang
Article
  • 147 Downloads

Abstract

Vanadium-bearing titanomagnetite concentrates were desulfurized with Acidithiobacillus ferrooxidans (A. ferrooxidans). The sulfur content of the concentrates was reduced from 0.69wt% to 0.14wt% after bioleaching for 15 d with a 10% pulp density at 30°C. Maintaining a stable pH value during biodesulfurization was critical because of high acid consumption, resulting from a combination of nonoxidative and oxidative dissolution of pyrrhotite in acid solution. It is discovered that the citric acid-disodium hydrogen phosphate buffer of pH 2.0 can control the solution pH value smoothly in the optimal range of 2.0–3.0 for A. ferrooxidans growth. Using the buffer in the volume fraction range of 5.0%–15.0% stimulates A. ferrooxidans growth and improves the biodesulfurization efficiency. Compared with the buffer-free control case, the maximum increase of biodesulfurization rate is 29.7% using a 10.0vol% buffer. Bioleaching provides an alternative process for desulfurization of vanadium-bearing titanomagnetite ores.

Keywords

titanomagnetite vanadium biodesulfurization Acidithiobacillus ferrooxidans citric acid disodium hydrogen phosphate 

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Copyright information

© University of Science and Technology Beijing and Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Xiao-rong Liu
    • 1
  • Sheng-cai Jiang
    • 2
  • Yan-jun Liu
    • 1
  • Hui Li
    • 1
  • Hua-jun Wang
    • 3
  1. 1.School of Materials Science and EngineeringShanghai Institute of TechnologyShanghaiChina
  2. 2.China Metallurgical Mining CorporationBeijingChina
  3. 3.Civil and Environmental Engineering SchoolUniversity of Science and Technology BeijingBeijingChina

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