Hazard-free treatment of electrolytic manganese residue and recovery of manganese using low temperature roasting-water washing process

• A process for hazard-free treatment electrolytic manganese residue (EMR) was proposed. Almost all of the ammonia in EMR recovered by low-temperature roasting. The present could be countercurrent water-washing. toxicity leaching results after met GB 8978?1996. combined low-temperature-roasting and water-washing is investigated as a method to treat recover manganese. In this study, phase transformation characteristics thermodynamics analysis low temperature roasting are evaluated. addition, effects time on washing roasted samples also investigated. Results reveal that some unstable phases within transformed into more stable depending time/temperature conditions used 60 min at 600 °C (R 60min/600°C ) exhibit highest rate recovery, 67.12 %. After 25 deionized water washing, concentration solution from R material become stable, whereas 6 cycles < 0.005 g/L. with three wash manganese-water suitable use metal production. Finally, tests show concentrations ions lower than regulatory limits mandated Chinese Integrated Wastewater Discharge Standard