Leaching of low-grade pyrolusite using rutin as reductant

To investigate the reductive leaching pyrolusite mechanism of organic matter in the molasses alcohol wastewater,the leaching process technology of leaching manganese from low-grade pyrolusite by using rutin as reductant in sulfuric acid was studied.Orthogonal and single-factor experiments were employed to examine the influences of the rutin concentration,sulfuric acid concentration,reaction temperature as well as leaching time on Mn leaching rate.The mechanism of leaching process was also studied.The results showed that the main influence factors of Mn leaching rate were in the following order: reaction temperature,sulfuric acid concentration,leaching time and rutin concentration.The most suitable conditions for the process of leaching manganese with H2SO4 and rutin were found as following: the initial concentration of sulfuric acid of 2.35 mol/L,initial concentration of rutin of 0.041 mol/L,the reaction temperature of 90 ℃ and the leaching time of 90 min.Under these conditions,the Mn leaching rate reaches more than 94.9%.