Extraction of Vanadium from Stone Coal by Dynamic Oxidizing Roasting Process with Laboratory Electric Rotary Kiln

A laboratory electric rotary kiln was used in the dynamic oxidizing roasting of Hubei stone coal.The results showed that the optimum roasting conditions are as follows: charge ratio of 16%,roasting temperature of 800 ℃,roasting time of 2.5 h and NaCl dosage of 10%.Compared with the static roasting with Muffle furnace,the dynamic oxidizing roasting can dramatically reduce NaCl dosage from 18% to 10% and the roasting temperature from 850 ℃ to 800 ℃,and distinctly raise the leaching rate from 64.03% to 72.64%.