Selective separation and recovery of iron and tin from high calcium type tin- and iron-bearing tailings using magnetizing roasting followed by magnetic separation

ABSTRACT

In this study, a process of magnetizing roasting followed by magnetic separation, which is used to separate or recover tin and iron from the high calcium type tin- and iron-bearing tailings (containing 35.53 wt.% Fe and 0.56 wt.% Sn), was investigated . A magnetic concentrate containing 66.3 wt.% Fe and 0.07 wt.% Sn with an iron recovery rate of 92.9 wt.% was obtained under optimal conditions: anthracite ratio of 2.5:100, roasting temperature of 850°C, roasting time of 30 min, grinding time of 10 min, and magnetic field intensity of 0.1 T. In addition, the effect of roasting parameters on the separation of iron and tin and phase transformation of SnO₂ was investigated by using X-ray powder diffraction, Scanning Electron Microscopy–Energy Dispersive Spectroscopy, etc.

KEYWORDS:

• High calcium type tin- and iron-bearing tailings
• cassiterite
• magnetizing roasting
• magnetic separation
• CaSnO₃

Acknowledgements

Both authors, Yuanbo Zhang and Tao Jiang, contributed equally to this paper.

Funding

The authors would express their heartfelt thanks to the National Natural Science Foundation of China (51574283), Co-Innovation Center for Clean and Efficient Utilization of Strategic Metal Mineral Resources, and Hunan Provincial Innovation Foundation for Postgraduate (CX2015B054).

Additional information

Funding

The authors would express their heartfelt thanks to the National Natural Science Foundation of China (51574283), Co-Innovation Center for Clean and Efficient Utilization of Strategic Metal Mineral Resources, and Hunan Provincial Innovation Foundation for Postgraduate (CX2015B054).