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

Xiao-rong Liu¹，Sheng-cai Jiang²，Yan-jun Liu¹，Hui Li¹，Hua-jun Wang³

1. School of Materials Science and Engineering,Shanghai Institute of Technology2. China Metallurgical Mining Corporation3. Civil and Environmental Engineering School,University of Science and Technology Beijing

摘 要：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 bufer 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 bufer in the volume fraction range of 5.0%-15.0%stimulates A.ferrooxidans growth and improves the biodesulfurization efciency.Compared with the bufer-free control case,the maximum increase of biodesulfurization rate is 29.7%using a 10.0vol%bufer.Bioleaching provides an alternative process for desulfurization of vanadium-bearing titanomagnetite ores.

关键词：