Separation and recovery of iron and manganese from high-iron manganese oxide ores by reduction roasting and magnetic separation technique

ABSTRACT

Sodium salts were used in the reduction roasting and magnetic separation process to separate and recover iron and manganese from the high-iron manganese oxide ores to utilize the complex ores. Results showed that Na₂S₂O₃ was the most effective salt. A magnetic concentrate with 86.39 wt% TFe and 96.21 wt% Fe recovery as well as a nonmagnetic product with 54.84 wt% TMn and 85.96 wt% Mn recovery was obtained when the ore sample was reduced at 1100°C for 100 min in the presence of 7 wt% Na₂S₂O₃. In addition, the effects of roasting and separation parameters on the recovery of manganese and iron and the function mechanism of Na₂S₂O₃ were investigated.

KEYWORDS:

• Lignite
• magnetic separation
• manganese ore
• reduction roasting
• sodium thiosulphate

Funding

This work was funded by the Teachers’ Research Fund of Central South University (grant number 2013JSJJ028), the Fundamental Research Funds for the Central Universities of Central South University (grant number 2016zzts465) and the Doctorial Research Innovation Project of Hunan Province (grant number CX2016B053).

Additional information

Funding

This work was funded by the Teachers’ Research Fund of Central South University (grant number 2013JSJJ028), the Fundamental Research Funds for the Central Universities of Central South University (grant number 2016zzts465) and the Doctorial Research Innovation Project of Hunan Province (grant number CX2016B053).