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Study on Formation Mechanism of Fayalite (Fe2SiO4) by Solid State Reaction in Sintering Process

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Abstract

The sintering behaviors among SiO2, FeS and Fe3O4 were detected to reveal the formation mechanism of Fe2SiO4. The results indicated that the formation mechanism is divided into five steps: (1) migration of O2− induced by S2− under a reducing atmosphere; (2) formation of Fe3O4−β ; (3) migration of Fe(II) into a ferrite cluster structure to gain oxygen and form Fe3−x O4; (4) Fe(II) invaded the silicon atomic position and released Si(IV); and (5) formation of the stable structure of Fe2SiO4 through chemical diffusion between cations of Fe(II) and Si(IV). These findings can provide theoretical support for controlling the process of the recovery of valuable metals in copper slag through the combined roasting modification–magnetic separation process.

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Acknowledgements

The authors gratefully acknowledge financial support from the key project of National Natural Science Foundation of China (51634010 and 51574295), Special Program on Environmental Protection for Public Welfare (201509050). Grants from the Project of Innovation-driven Plan in Central South University (No. 2015CX001).

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Correspondence to Yanjie Liang or Hui Liu.

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Wang, Z., Peng, B., Zhang, L. et al. Study on Formation Mechanism of Fayalite (Fe2SiO4) by Solid State Reaction in Sintering Process. JOM 70, 539–546 (2018). https://doi.org/10.1007/s11837-017-2699-6

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  • DOI: https://doi.org/10.1007/s11837-017-2699-6

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