Microwave roasting-acidic leaching technique for extraction of vanadium from stone coal

作者：Zhang Xiao Yun; Qin Wen Qing; Tian Xue Da^*; Chen Yan Bo; Gu Yu; Xi Xiao Guang

来源：Chinese Journal of Nonferrous Metals, 2011, 21(4): 908-912.

• Acidic leaching
• Key factors
• Leaching procedures
• Leaching rates
• Leaching time
• Positive correlations
• Stone coal
• Vanadium extractions
• Vanadium pentoxide

Compared with the conventional roasting-acidic leaching procedure and acidic leaching process of raw stone coal, the microwave roasting-acidic leaching technique for extraction of vanadium from stone coal was developed, and the effects of H2SO4 dosage and leaching time on vanadium extraction were investigated. The results show that the leaching rate of V2O5 reaches up to 83.5% when the tested sample is microwave roasted (without any additive) at 700 °C for 60 min, the dosage of sulfuric acid is 22% of V2O5 leaching at 90 °C. The leaching rate is improved by about 30%, more than that obtained from the conventional roasting or acidic leaching of raw stone coal under the same leaching conditions. The positive correlation between the leaching rate of V2O5 and Al2O3 is found out by leaching V2O5 and Al2O3 from both the roasted samples and raw stone coal. Based on the minerals crystal constitution and the characteristics of microwave roast, the mechanism on improving the leaching rate of V2O5 by microwave roasting was discussed. It is indicated that the breakage of the minerals crystal constitution resulted from microwave roasting is the key factor of affecting the improvement of V2O5 leaching rate.

• 出版日期2011
• 单位中南大学