A novel roasting method for treating high-chromium vanadium slag
Aijun Teng and Xiangxin Xue
Department of resource and environment, Northeastern University, PR China
Liaoning Key Laboratory of Recycling Science for Metallurgical Resources-Northeastern University, PR China
: Expert Opin Environ Biol
Abstract
In this study, a novel clean roasting process for extracting vanadium from vanadium slag has been developed. The high-chromium vanadium slag was treated by NaOH-Na2CO3 binary sodium salts in the roasting process, and the effect of related parameters on the roasting was investigated. During the NaOH-Na2CO3 binary roasting process, the roasting temperature, roasting time and NaOH-Na2CO3 mass ratio took a significant role in the extraction rate of vanadium and chromium. The ferriferous oxide (Fe3O4) was oxidized to ferric oxide (Fe2O3), V2O5 and Cr2O3 were converted to the β-natrium-vanadate type structure of Na3VO4 and orthorhombic-type crystal structure of Na2CrO4, respectively. Under the optimum roasting conditions (roasting temperature of 600℃, roasting time of 60 min, and NaOH to Na2CO3 mass ratio of 1.5:1), the extraction rates of vanadium and chromium were 98.66% and 83.57%. The major metal element in the leaching residue was Fe.
Biography
Aijun Teng was the Doctoral student from Department of Resource and Environment of Northeastern University. He worked on the Metallurgical Resources Recycling and Waste Treatment Field.
E-mail: wdtaj2008@163.com
