Abstract
Abstract To comprehensively reuse copper ore tailings, the recovery of γ-Fe2O3 from magnetic roasted slag after sulfur release from copper ore tailings followed by magnetic separation is performed. In this work, after analysis of chemical composition and mineralogical phase composition, the effects of parameters in both magnetization roasting and magnetic separation process with respect to roasting temperature, residence time, airflow, particle size distribution, magnetic field intensity, and the ratio of sodium dodecyl sulfonate to roasted slag were investigated. Under optimum parameters, a great number of γ-Fe2O3 is recycled with a grade of 66.86% and a yield rate of 67.21%. Meanwhile, the microstructure, phase transformation and magnetic property of copper ore tailings, roasted slag, and magnetic concentrate are carried out.
Highlights
To comprehensively reuse copper ore tailings, the recovery of γ-Fe2O3 from magnetic roasted slag after sulfur release from copper ore tailings followed by magnetic separation is performed
The chemical composition of the copper ore tailings was obtained by X-ray fluorescence Spectrometer (XRF- Axios, The Netherlands, wavelength dispersive type, 2.4 kW) while the content ranges from 0.01 to 100% and the sample diameter is 32 mm, using Rh target with θ/2θ scanning mode of the goniometer according to JY/T 016-1996
After roasting at 1,200°C with the duration time from 20 to 60 min, the sulfur release rate reached to 99.78% and the residual S content reduced to 0.06% [4]
Summary
Abstract: To comprehensively reuse copper ore tailings, the recovery of γ-Fe2O3 from magnetic roasted slag after sulfur release from copper ore tailings followed by magnetic separation is performed. The microstructure, phase transformation and magnetic property of copper ore tailings, roasted slag, and magnetic concentrate are carried out. To effectively prevent the environmental risk of the copper ore tailings and recycle the sulfur resource in the copper ore tailings, the sulfur released as SO2 can be collected to produce sulfuric acid by oxidation roasting as mentioned in the previous study [4]. The magnetizing roasting of the copper ore tailings followed by magnetic separation is further investigated to recover γ-Fe2O3 from the roasted slag. Q b q-Quartz b-Biotite c-Clinochlore g-Pyrrhotite s-Sulfur t-Lepidocrocite c q t c c c s s g ct q g t qgb b q q
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
