Kinetics of leaching vanadium with acid from sodium roasting calcine of stone coal

The effects of initial sulfuric acid concentration, stirring speed, and leaching temperature on leaching rate in the process of leaching vanadium with sulfuric acid from sodium roasting calcine of stone coal were investigated. The results show that initial sulfuric acid concentration and leaching temperature affect vanadium leaching rate apparently, and stirring speed nearly have rio effect on the leaching rate. The leaching process can be modeled with the shrinking core model, and the kinetics of the reaction is successfully described by the kinetics equation of chemical reaction control. The kinetic apparent activation energy E has been calculated as about 50.88 kJ·mol^-1, which indicates that the leaching process is controlled by surface chemical reaction.