A PARAMETRIC STUDY ON THE SULFURIC ACID LEACHING OF VANADIUM OF AN IRANIAN THERMAL POWER PLANT ASH

Vanadium recovery of thermal power plant ash (tppa) is an attractive process which simultaneouslysatisfies the pollution control standards regarding tppa disposal and provides a valuable source of vanadium forindustrial demands. in the present research work, sulfuric acid leaching route has been employed for vanadiumrecovery from an iranian tppa. effects of acid concentration, temperature, acid/tppa ratio, leaching time as well astppa particle size on the leaching efficiency of vanadium have been investigated. experimental results showed thatleaching efficiency of vanadium is significantly affected by the leaching conditions. the results revealed that with acidconcentration of about 15%, temperature around 75 °c, acid/tppa ratio~15, leaching time about 120 minutes andparticle size of 75 - 150 ?m, almost 92% of vanadium can be dissolved.