Dry magnetic separation technology for the recovery of iron minerals in fine-grained steel slag

Authors

  • Liang Chang Shi 1.College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, Henan, 454003, China;2.Henan Key Laboratory for Green and Efficient Mining & Comprehensive Utilization of Mineral Resources, Henan Polytechnic University, Jiaozuo, Henan, 454003, China
  • Nan Sheng Wang 1.College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, Henan, 454003, China;
  • Gan Cheng 1.College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, Henan, 454003, China;2.Henan Key Laboratory for Green and Efficient Mining & Comprehensive Utilization of Mineral Resources, Henan Polytechnic University, Jiaozuo, Henan, 454003, China

Keywords:

fine-grained steel slag, dry magnetic separation, self-developed magnetic separator, magnetic system, iron recovery

Abstract

Using the MagNet software package, a permanent magnetic circuit was simulated and a sectorially-spliced magnetic system was designed. Consequently, a new roller permanent magnetic separator with different magnetic field intensities in each roller was developed. The modular structural design allows fine-grained minerals with different magnetic susceptibility to be separated in one pass, according to their different processing characteristic. Steel slag, selected from a factory, was crushed, ground and sieved into different particle size ranges for the single-factor magnetic separation experiments. It was determined that the optimum value ranges for the particle size, magnetic separation distance and rotating frequency were 0.15 mm-0.3 mm, 10 mm-12 mm, 40 Hz?60Hz, respectively; using the chosen parameter values of 0.2mm, 11mm, and 40Hz, the concentrate recovery and concentrate grade of the new separation technology reached up to 52.78% and 64.74%, in comparisson with the existing technology.Thus, it was demonstrated that the self-developed separation technology has the potential to improve the iron recovery of the fine-grained steel slag.

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Published

2020-01-27

Issue

Engineering Review, Vol. 40, No. 1

Section

Articles

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