In this work, the optimal parameter values for the dissolution of manganese in the leach residue were determined after zinc oxide in the waste battery powder prepared from spent zinc carbon and alkaline batteries was removed by dissolving in nitric acid solution. The concentration of sulfuric acid, reaction temperature and reaction time were selected as independent variables, and response surface method (RSM) was used to optimize the parameter values that have an effect on the dissolution. Molasses was utilized as reducing agent to increase the dissolution of manganese. To see the interactive effects of process variables, the multiple regression analysis to the experimental findings was performed, and a modified equation was obtained. At the end of the experiments, it was determined that the leaching efficiency increased with an increase in the concentration of sulfuric acid, reaction temperature and reaction time. It was observed that the reaction temperature and reaction time were more effective parameters on the dissolution. To reach the maximum leaching efficiency, the optimum experimental conditions were found to be 2.07 mol/L, 68.8 °C and 120 min. It was determined that 93% of manganese in the solid residue was dissolved under optimal conditions.
Primary Language | Turkish |
---|---|
Journal Section | Articles |
Authors | |
Publication Date | June 30, 2019 |
Published in Issue | Year 2019 Volume: 34 Issue: 2 |