Co-recovery of manganese from low-grade pyrolusite and vanadium from stone coal using fluidized roasting coupling technology

Based on the novel technology of Co-recovery of manganese from low-grade pyrolusite and vanadium from stone coal using fluidized roasting coupling technology, the leaching effect of manganese and vanadium has been investigated and many technical conditions have also been optimized. The results indicated that the optimum leaching efficiency of 99.25% for manganese and 91.84% for vanadium could be attained under the conditions that the mass ratio of stone coal to pyrolusite was 3:1, the roasting temperature of stone coal was 1000 °C, the roasting temperature of pyrolusite was 800 °C, the roasting time was 2 h, the sulphuric acid concentration was 2 mol/L, the leaching temperature was 75 °C, and the leaching time was 2 h.

► The novel fluidized roasting coupling technology is efficient and eco-friendly.
► The leaching effect of manganese and vanadium has been investigated.
► Many technical conditions have been optimized.
► The optimum leaching efficiency of 99.25% for Mn and 91.84% for V was attained.