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Leaching of vanadium, sodium, and silicon from molten V-Ti-bearing slag obtained from low-grade vanadium-bearing titanomagnetite

  • Yuan-yuan Zhu
  • Ling-yun Yi
  • Wei Zhao
  • De-sheng ChenEmail author
  • Hong-xin Zhao
  • Tao QiEmail author
Article

Abstract

The water leaching process of vanadium, sodium, and silicon from molten vanadium-titanium-bearing (V-Ti-bearing) slag obtained from low-grade vanadium-bearing titanomagnetite was investigated systematically. The results show that calcium titanate, sodium aluminosilicate, sodium oxide, silicon dioxide and sodium vanadate are the major components of the molten V-Ti-bearing slag. The experimental results indicate that the liquid-solid (L/S) mass ratio significantly affects the leaching process because of the respective solubilities and diffusion rates of the components. A total of 83.8% of vanadium, 72.8% of sodium, and 16.1% of silicon can be leached out via a triple counter-current leaching process under the optimal conditions of a particle size below 0.074 mm, a temperature of 90°C, a leaching time of 20 min, an L/S mass ratio of 4:1, and a stirring speed of 300 r/min. The kinetics of vanadium leaching is well described by an internal diffusion-controlled model and the apparent activation energy is 11.1 kJ/mol. The leaching mechanism of vanadium was also analyzed.

Keywords

titanomagnetite vanadium metallurgy leaching kinetics sodium silicon leaching rate 

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Copyright information

© University of Science and Technology Beijing and Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.University of Chinese Academy of SciencesBeijingChina
  2. 2.National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process EngineeringChinese Academy of SciencesBeijingChina
  3. 3.Key Laboratory of Green Process and Engineering, Institute of Process EngineeringChinese Academy of SciencesBeijingChina

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