Materials Transactions Online

Materials Transactions, Vol.59 No.05 (2018) pp.843-849
© 2018 The Mining and Materials Processing Institute of Japan

Scorodite Synthesis in As(V)-Containing Fe(II) Solution in the Presence of Hematite as a Fe(III) Source

Atsushi Iizuka, Kozo Shinoda and Etsuro Shibata

Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan

Stabilization of arsenic by precipitation of large crystalline scorodite (FeAsO4ยท2H2O) particles is considered to be a promising option for treating As(V) contained in industrial by-products. In this study, scorodite synthesis by direct addition of hematite particles as a Fe(III) source to Fe(II) solution containing As(V) was investigated with different initial Fe(II) concentrations. During scorodite formation, the Fe(II) concentration and pH of the reaction solution are almost constant, and the residual arsenic concentration in the solution is low. The initial Fe(II) concentration strongly affects scorodite formation, and larger faceted crystalline scorodite particles are obtained with higher initial Fe(II) concentration. The observed scorodite particle size is larger than that formed by the conventional DMSP method. Coarse faceted scorodite can also be obtained by direct addition of hematite powder to FeSO4 solution with As(V). From the results of environmental leaching tests, O2 gas blowing for a short time to convert the remaining unstable gel-like precursor to crystalline scorodite is very effective to prevent arsenic leaching. Furthermore, for the gel-like precursor formed in the initial stage of the scorodite synthesis process, chemical state analysis by X-ray absorption spectroscopy in the range of the X-ray absorption near-edge structure at the Fe K absorption edge for iron reveals that the precursor contains Fe(II) as well as Fe(III). This indicates that scorodite does not directly form from Fe(III) ions from hematite and arsenate ions from solution, but a gel-like precursor initially forms from Fe(II) ions in solution and is then converted to crystalline scorodite.

[doi:10.2320/matertrans.M-M2018809]

(Received 2017/12/06; Accepted 2018/02/06; Published 2018/04/25)

Keywords: scorodite, arsenic, hematite, gel-like precursor

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REFERENCES

  1. Dove P.M. and Rimstidt J.D.: Am. Mineral. 70 (1985) 838-844.
  2. Dutrizac J.E., Jambor J.L. and Chen T.T.: Can. Metall. Q. 26 (1987) 103-115.
  3. Dutrizac J.E. and Jambor J.L.: Hydrometallurgy 19 (1988) 377-384.
  4. Fujita T., Taguchi R., Abumiya M., Matsumoto M., Shibata E. and Nakamura T.: Hydrometallurgy 90 (2008) 92-102.
  5. Fujita T., Taguchi R., Abumiya M., Matsumoto M., Shibata E. and Nakamura T.: Hydrometallurgy 90 (2008) 85-91.
  6. Fujita T., Taguchi R., Abumiya M., Matsumoto M., Shibata E. and Nakamura T.: Hydrometallurgy 96 (2009) 189-198.
  7. Fujita T., Taguchi R., Shibata E. and Nakamura T.: Hydrometallurgy 96 (2009) 300-312.
  8. H. Kubo, M. Abumiya and M. Matsumoto: Proc. Copper 2010, (GDMB Society for Mining, Metallurgy, Resource and Environmental Technology, 2010) pp. 2947-2958.
  9. E. Shibata, N. Onodera, T. Nakamura and M. Abumiya: Proc. COM2012, (2012) WALSIM II pp. 241-252.
  10. N. Hashimoto, M. Abumiya, H. Yatsuhashi, K. Matsumoto and T. Sugawara: Proc. Copper 2013 Vol. 1, (2013) pp. 387-397.
  11. Shinoda K., Tanno T., Fujita T. and Suzuki S.: Mater. Trans. 50 (2009) 1196-1201.
  12. E. Shibata, N. Onodera, T. Nakamura and M. Abumiya: Collected Abstracts of the 2013 Autumn Meeting of the MMIJ (2013) pp. 309-312.
  13. E. Shibata, N. Onodera, T. Nakamura and M. Abumiya: Proc. 7th Int. Symp. Hydrometallurgy (Hydro 2014), (2014) Vol. II, pp. 533-573.
  14. E. Shibata, N. Onodera, T. Nakamura and M. Abumiya: Japan Patent, JP2015-3852A, (2016).
  15. M. Abumiya, T. Inanaga, K. Morimoto and A. Fuwa: Japan Patent, JP2016-79078A, (2016).
  16. Watanabe T., Morimoto K., Abumiya M., Fuwa A. and Inanaga T.: Proc. Copper 2016 (2016) 2738-2749.
  17. Ministry of the Environment of Japan, 1973. Determination of metals and other substances contained in industrial waste. Ministry of the Environment Notification No. 13, Ministry of the Environment of Japan. Tokyo, February 17, 1973 (in Japanese).


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