Abstract:Relevancy of V, K and Mg in sulfuric acid leaching process was investigated to uncover leaching mechanism of vanadium for mica-type vanadium-bearing stone coal. The results show that V, K and Mg have close symbiotic relationship in mica mine, with part of magnesium occurring in calcite. At low temperature, both vanadium-potassium and vanadium-magnesium show a poor leaching correlation, and leaching of dissociative high valence vanadium is prevailing. At high temperature, both vanadium-potassium and vanadium-magnesium present a good leaching correlation, and leaching of low valence vanadium trapped in lattice is prevailing. Concentration of sulfuric acid has less effect on relevancy of V, K and Mg, and both vanadium-potassium and vanadium-magnesium have a good leaching correlation under different concentration of sulfuric acid at 95 ℃. Under the same condition, leaching rate of magnesium is higher than that of potassium and vanadium due to a faster dissolution rate of magnesium-bearing calcite in sulfuric acid.