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Nutrient Supply to Seawater from Steelmaking Slag: The Coupled Effect of Gluconic Acid Usage and Slag Carbonation

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Abstract

Vanishing of seaweeds in coastal areas has become a serious environmental problem. Part of the reason is nutrient deficiency in seawater, especially iron. Steelmaking slag is probably one of the best nutrient suppliers in terms of cost and quantity. Utilizing steelmaking slag to fertilize coastal seaweeds may simultaneously address the two challenges of seaweed restoration and byproduct treatment. However, direct usage of slag from a basic oxygen furnace is not practical because of negative effects such as a sharp pH increase and magnesium loss. To address the disadvantages, this work investigated the leaching behavior of a practical steelmaking slag in an artificial seawater and clarified the coupled effect of gluconic acid usage and slag carbonation on aiding the nutrient supply. Slag carbonation prevents a drastic pH increase and Mg loss, while gluconic acid induces formation of stable chelated complexes. The combination of slag carbonation and gluconic acid usage results in significant improvements in the nutrient supply. By leaching the slag, the maximum concentration of Fe in seawater increases to 0.29 mg L−1, 193 times larger than the value in the initial seawater (1.5 μg L−1).

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Acknowledgment

The authors appreciate Prof. Hiroyuki Matsuura’s (The University of Tokyo) assistance with the experiment and helpful comments.

Conflict of interest

All authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Department of Advanced Materials, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwanoha 5-1-5-501, Kashiwa-shi, Chiba-ken, 2778561, Japan

    Yuta Sakurai, Xiao Yang, Yuta Hisaka & Fumitaka Tsukihashi

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  1. Yuta Sakurai
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  2. Xiao Yang
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  3. Yuta Hisaka
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  4. Fumitaka Tsukihashi
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Correspondence to Xiao Yang.

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Manuscript submitted September 16, 2019.

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Sakurai, Y., Yang, X., Hisaka, Y. et al. Nutrient Supply to Seawater from Steelmaking Slag: The Coupled Effect of Gluconic Acid Usage and Slag Carbonation. Metall Mater Trans B 51, 1039–1047 (2020). https://doi.org/10.1007/s11663-020-01805-z

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