Dissolution of olivines from steel and copper slags in basic solution
| Autor: | Tunahan Aytas, Brian Traynor, Ciara Mulcahy, Nicolas Chanut, Elsa Olivetti, Hugo Uvegi |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Aqueous solution
Mineral Olivine Chemistry 0211 other engineering and technologies chemistry.chemical_element 02 engineering and technology Building and Construction engineering.material 021001 nanoscience & nanotechnology Copper Copper slag Chemical engineering Basic solution 021105 building & construction engineering Fayalite General Materials Science 0210 nano-technology Dissolution |
| Zdroj: | Cement and Concrete Research. 133:106065 |
| ISSN: | 0008-8846 |
| DOI: | 10.1016/j.cemconres.2020.106065 |
| Popis: | This study explores the effect of aqueous chemical environment on the dissolution rate of the minerals γ-C2S and fayalite, identified as primary phases of ladle furnace steel slag and copper slag. γ-C2S and fayalite were exposed to solutions of NaOH and Ca(OH)2, chosen to mimic the pore solutions of alkali-activated and Portland-cement based binders. While both from the olivine mineral group, γ-C2S and fayalite displayed opposing dissolution trends with respect to pH. The rates of γ-C2S dissolution were observed to decrease with higher pH, while fayalite dissolution rates increased with pH, and both relationships were described via empirical functions of the form R = k ∙ aH+n. The contrasting dependence of dissolution rate on pH for both minerals was attributed to the formation of chemically distinct surface layers on both minerals during dissolution. These results have significance for blending of slags with high olivine contents in binders with a range of aqueous chemical environments. |
| Databáze: | OpenAIRE |
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