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Zero-Waste Recycling Method for Nickel Leaching Residue by Direct Reduction–Magnetic Separation Process and Ceramsite Preparation

  • Qiang Zhao
  • Jilai XueEmail author
  • Wen Chen
Technical Paper
  • 5 Downloads

Abstract

In this paper, a novel process for beneficiation of metallic iron from nickel leaching residue and preparation of ceramsite from tailings by direct reduction–magnetic separation process is reported. The optimal conditions for direct reduction process were 1100 °C roasting temperature, 120 min duration, and 30 wt.% reductant dosage. The reduced sample was benefited from low-intensity magnetic separation. This process yielded an iron concentrate of 82.32 wt.% grade and 78.05 wt.% recovery. Hence, this metallic iron could be used as a feedstock for the steel industry. Tailings of the magnetic separation procedure were used to prepare ceramsite. Optimal conditions for preparing ceramsite were: 55% magnetic separation tailings, 20% silica, 15% fly ash, 10% charcoal, a 1150 °C roasting temperature, and a holding time of 30 min. The ceramsite properties met the requirement of CJ/T299-2008 National Standard. These results suggested that developing this solid waste would have environmental and economic benefits.

Keywords

Zero-waste recycling Nickel leaching residue Direct reduction Ceramsite preparation 

Notes

Acknowledgements

The authors wish to express their thanks to the Natural Science Foundation of China (NO.5157041410) for the financial support of this research.

Author Contributions

Qiang Zhao conducted the experimental work and prepared the manuscript; Jilai Xue directed the research work and modified the manuscript; Wen Chen participated in the design of the research work at different stages.

Compliance with Ethical Standards

Conflicts of interest

The authors declare no conflict of interest.

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Copyright information

© The Indian Institute of Metals - IIM 2019

Authors and Affiliations

  1. 1.School of Metallurgical and Ecological EngineeringUniversity of Science and TechnologyBeijingChina
  2. 2.Changsha Research Institute of Mining and Metallurgy Co, LtdChangshaChina

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