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Effects of pH and metal composition on selective extraction of calcium from steel slag for Ca(OH)(2) production

This research article explains the effects of pH and metal composition on the selective calcium extraction from steel slag. The operating parameters including extraction solvent type, solvent concentration, metal composition of steel slag, substance type and pH were investigated. HCl, NH(4)Cl, NH(4)...

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Detalles Bibliográficos
Autores principales: Lee, Ye Hwan, Eom, Hanki, Lee, Sang Moon, Kim, Sung Su
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8695367/
https://www.ncbi.nlm.nih.gov/pubmed/35423306
http://dx.doi.org/10.1039/d0ra08497b
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author Lee, Ye Hwan
Eom, Hanki
Lee, Sang Moon
Kim, Sung Su
author_facet Lee, Ye Hwan
Eom, Hanki
Lee, Sang Moon
Kim, Sung Su
author_sort Lee, Ye Hwan
collection PubMed
description This research article explains the effects of pH and metal composition on the selective calcium extraction from steel slag. The operating parameters including extraction solvent type, solvent concentration, metal composition of steel slag, substance type and pH were investigated. HCl, NH(4)Cl, NH(4)OH and NaOH were employed as solvents to extract Ca from steel slag. It has been shown that hydrochloric acid effectively extracts Ca. The high metal content in steel slag reacted sensitively to the solvent concentration, and a specific concentration was derived to selectively extract Ca. The optimal solvent for calcium extraction was 2 M HCl, which induced the extraction of 97% of Ca; 46% of Mg; 35% of Al; and 1% of Si from the steel slag. In order to separate Ca in the leaching solution from other metal ions, various acidic/basic substances were added to regulate the pH. The optimal pH level for removing the impurities without calcium was found to be 9.5. The precipitated impurities were removed by filtration, and the pH was adjusted to 13 or higher for Ca(OH)(2)(s) production. In conclusion, scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) revealed that the Ca content produced through the process was more than 99%. It is expected that high-purity Precipitated Calcium Carbonate (PCC) will be achieved when the generated Ca(OH)(2) is used as a source of calcium for mineral carbonation.
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spelling pubmed-86953672022-04-13 Effects of pH and metal composition on selective extraction of calcium from steel slag for Ca(OH)(2) production Lee, Ye Hwan Eom, Hanki Lee, Sang Moon Kim, Sung Su RSC Adv Chemistry This research article explains the effects of pH and metal composition on the selective calcium extraction from steel slag. The operating parameters including extraction solvent type, solvent concentration, metal composition of steel slag, substance type and pH were investigated. HCl, NH(4)Cl, NH(4)OH and NaOH were employed as solvents to extract Ca from steel slag. It has been shown that hydrochloric acid effectively extracts Ca. The high metal content in steel slag reacted sensitively to the solvent concentration, and a specific concentration was derived to selectively extract Ca. The optimal solvent for calcium extraction was 2 M HCl, which induced the extraction of 97% of Ca; 46% of Mg; 35% of Al; and 1% of Si from the steel slag. In order to separate Ca in the leaching solution from other metal ions, various acidic/basic substances were added to regulate the pH. The optimal pH level for removing the impurities without calcium was found to be 9.5. The precipitated impurities were removed by filtration, and the pH was adjusted to 13 or higher for Ca(OH)(2)(s) production. In conclusion, scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) revealed that the Ca content produced through the process was more than 99%. It is expected that high-purity Precipitated Calcium Carbonate (PCC) will be achieved when the generated Ca(OH)(2) is used as a source of calcium for mineral carbonation. The Royal Society of Chemistry 2021-02-22 /pmc/articles/PMC8695367/ /pubmed/35423306 http://dx.doi.org/10.1039/d0ra08497b Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by/3.0/
spellingShingle Chemistry
Lee, Ye Hwan
Eom, Hanki
Lee, Sang Moon
Kim, Sung Su
Effects of pH and metal composition on selective extraction of calcium from steel slag for Ca(OH)(2) production
title Effects of pH and metal composition on selective extraction of calcium from steel slag for Ca(OH)(2) production
title_full Effects of pH and metal composition on selective extraction of calcium from steel slag for Ca(OH)(2) production
title_fullStr Effects of pH and metal composition on selective extraction of calcium from steel slag for Ca(OH)(2) production
title_full_unstemmed Effects of pH and metal composition on selective extraction of calcium from steel slag for Ca(OH)(2) production
title_short Effects of pH and metal composition on selective extraction of calcium from steel slag for Ca(OH)(2) production
title_sort effects of ph and metal composition on selective extraction of calcium from steel slag for ca(oh)(2) production
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8695367/
https://www.ncbi.nlm.nih.gov/pubmed/35423306
http://dx.doi.org/10.1039/d0ra08497b
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