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  • 1.
    De Colle, Mattia
    et al.
    KTH Royal Institute of Technology .
    Kielman, Ross
    KTH Royal Institute of Technology.
    Karlsson, Andreas
    Swedish Museum of Natural History, Department of Geology.
    Karasev, Andrey
    KTH Royal Institute of Technology.
    Jönsson, Pär G.
    KTH Royal Institute of Technology.
    Study of the Dissolution of Stainless-Steel Slag Minerals in Different Acid Environments to Promote Their Use for the Treatment of Acidic Wastewaters2021In: Applied Sciences, E-ISSN 2076-3417, Vol. 11, no 24, p. 1-19, article id 1210Article in journal (Refereed)
    Abstract [en]

    Several stainless-steel slags have been successfully employed in previous studies as substi-tutes for lime in the treatment of industrial acidic wastewaters. This study deepens the knowledge ofsuch application, by analyzing the neutralizing capacity of different slags related to their mineralcompositions. To do so, firstly the chemical and mineral compositions of all the slag samples areassessed. Then, 0.5 g, 1 g, 2 g of each slag and 0.25 g and 0.5 g of lime are used to neutralize 100 g of0.1 M HCl or HNO3 solutions. After the has neutralization occurred, the solid residues are extractedand analyzed using XRD spectroscopy. Then, the solubility of the minerals is assessed and ranked,by comparing the XRD spectra of the residues with the obtained pH values. The results showthat minerals such as dicalcium silicate and bredigite are highly soluble in the selected experimentalconditions, while minerals such as merwinite and åkermanite, only partially. Moreover, Al-rich slagsseem to perform poorly due to the formation of hydroxides, which generate extra protons. However,when the weight of slag is adequately adjusted, Al-rich slags can increase the pH values to higherlevels compared to the other studied slags.

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