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

• Published in: 矿物冶金与材料学报：英文版 Vol. 23; no. 8; pp. 898 - 905
• Main Author: Yuan-yuan Zhu Ling-yun Yi Wei Zhao De-sheng Chen Hong-xin Zhao Tao Qi
• Format: Journal Article
• Language: English
• Published: 2016
• Subjects: 二氧化硅; 低品位; 浸出过程; 熔融; 表观活化能; 钒钛渣; 钒钛磁铁矿; 铝酸钠
• ISSN: 1674-4799; 1869-103X

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.