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Alkali Elution of Various Mineralogical Phases in Steelmaking Slag

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Book cover REWAS 2019

Part of the book series: The Minerals, Metals & Materials Series ((MMMS))

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Abstract

To suppress alkaline elution from steelmaking slag, the dissolution behaviors of mineralogical phases in slag need to be studied. In this paper, primary crystal phases (CaO·SiO2, CaO·SiO2·FeO, and CaO·SiO2·2MgO) of CaO–SiO2–FeOx and CaO–SiO2–MgO systems were synthesized, and their dissolution behaviors and the change in pH were investigated. The results showed that CaO·SiO2 caused the increase in pH by the dissolution of alkali. Therefore, the alkali elution from steelmaking slag is caused by not only free CaO and 2CaO·SiO2 but also CaO·SiO2. Then, slags corresponding to actual steelmaking composition in the system CaO–SiO2–FeOx and CaO–SiO2–MgO systems were synthesized and their dissolution behaviors were observed. The result showed that the pH values after the dissolution of every slag were lower than that of CaCO3, even though water soluble phases were contained in slag. Therefore, alkali elution from slag containing soluble phases can be suppressed when the mass fractions of these phases in slag are low enough.

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Author information

Authors and Affiliations

  1. Graduate School of Engineering, Tohoku University, Sendai, Japan

    Zuoqiao Zhu

  2. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan

    Xu Gao, Shigeru Ueda & Shin-ya Kitamura

Authors
  1. Zuoqiao Zhu
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  2. Xu Gao
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  3. Shigeru Ueda
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  4. Shin-ya Kitamura
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Corresponding author

Correspondence to Zuoqiao Zhu .

Editor information

Editors and Affiliations

  1. Alfred University, Alfred, NY, USA

    Gabrielle Gaustad

  2. Gopher Resource, Eagan, MN, USA

    Camille Fleuriault

  3. Norwegian University of Science and Technology, Trondheim, Norway

    Mertol Gökelma

  4. Purdue University, West Lafayette, IN, USA

    John A. Howarter

  5. Massachusetts Institute of Technology, Cambridge, MA, USA

    Randolph Kirchain

  6. Colorado State University, Fort Collins, CO, USA

    Kaka Ma

  7. Umicore, Olen, Belgium

    Christina Meskers

  8. IND LLC, South Jordan, UT, USA

    Neale R. Neelameggham

  9. Massachusetts Institute of Technology, Cambridge, MA, USA

    Elsa Olivetti

  10. Worcester Polytechnic Institute, Worcester, MA, USA

    Adam C. Powell

  11. Worcester Polytechnic Institute, Worcester, MA, USA

    Fiseha Tesfaye

  12. Johan Gadolin Process Chem Ctr, Abo Akademi University, Turku, Finland

    Dirk Verhulst

  13. ArcelorMittal Global R&D, Schererville, IN, USA

    Mingming Zhang

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© 2019 The Minerals, Metals & Materials Society

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Zhu, Z., Gao, X., Ueda, S., Kitamura, Sy. (2019). Alkali Elution of Various Mineralogical Phases in Steelmaking Slag. In: Gaustad, G., et al. REWAS 2019. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-10386-6_25

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