High
leaching efficiency can be obtained by Acidic leaching especially with H2SO4,
but the filtrate separation is complex in this process. Alkaline leaching with concNaOH can selectivity leech vanadium and the leaching efficiency of vanadium
can be increased up to 78.69% by electric field. Leaching efficiency of
vanadium and chromium with H2O2 and electric field can be up to 97.77% and
95.14%, respectively.