Biodesulfurization of vanadium-bearing titanomagnetite concentrates and pH control of bioleaching solution
Biodesulfurization of vanadium-bearing titanomagnetite concentrates and pH control of bioleaching solution作者机构:School of Materials Science and EngineeringShanghai Institute of Technology China Metallurgical Mining Corporation Civil and Environmental Engineering SchoolUniversity of Science and Technology Beijing
出 版 物:《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报(英文版))
年 卷 期:2013年第20卷第10期
页 面:925-930页
核心收录:
学科分类:0709[理学-地质学] 0819[工学-矿业工程] 0806[工学-冶金工程] 08[工学] 0708[理学-地球物理学] 0805[工学-材料科学与工程(可授工学、理学学位)] 080601[工学-冶金物理化学] 0703[理学-化学] 0802[工学-机械工程] 0801[工学-力学(可授工学、理学学位)] 0702[理学-物理学]
基 金:financially supported by the National Natural Science Foundation of China(No.51074107) Shanghai Municipal Education Commission(Shanghai Leading Academic Discipline Project J51504)
主 题:titanomagnetite vanadium biodesulfurization Acidithiobacillus ferrooxidans citric acid disodium hydrogenphosphate
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℃. 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. ferooxidans 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.