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Study of the Dissol...
Study of the Dissolution of Stainless-Steel Slag Minerals in Different Acid Environments to Promote Their Use for the Treatment of Acidic Wastewaters
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- De Colle, Mattia (author)
- KTH,Materialvetenskap,KTH Royal Institute of Technology
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- Kielman, Ross (author)
- KTH,KTH Royal Institute of Technology
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- Karlsson, Andreas, 1986- (author)
- Naturhistoriska riksmuseet,Enheten för geovetenskap
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- Karasev, Andrey (author)
- KTH,Processer,KTH Royal Institute of Technology
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- Jönsson, Pär (author)
- KTH,Processer,KTH Royal Institute of Technology
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(creator_code:org_t)
- 2021-12-19
- 2021
- English.
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In: Applied Sciences. - : MDPI AG. - 2076-3417. ; 11:24
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https://doi.org/10.3...
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https://urn.kb.se/re...
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Abstract
Subject headings
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- Several stainless-steel slags have been successfully employed in previous studies as substitutes for lime in the treatment of industrial acidic wastewaters. This study deepens the knowledge of such application, by analyzing the neutralizing capacity of different slags related to their mineral compositions. To do so, firstly the chemical and mineral compositions of all the slag samples are assessed. 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 of 0.1 M HCl or HNO3 solutions. After the has neutralization occurred, the solid residues are extracted and 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 show that minerals such as dicalcium silicate and bredigite are highly soluble in the selected experimental conditions, while minerals such as merwinite and akermanite, only partially. Moreover, Al-rich slags seem 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 higher levels compared to the other studied slags.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Metallurgi och metalliska material (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Metallurgy and Metallic Materials (hsv//eng)
Keyword
- steelmaking slag
- solubility
- minerals
- wastewater treatment
- leaching
- The changing Earth
Publication and Content Type
- ref (subject category)
- art (subject category)
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