Dissolution of olivines from steel and copper slags in basic solution
Dissolution of olivines from steel and copper slags in basic solution
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DOI：
10.1016/j.cemconres.2020.106065
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发表时间：
2020-07
影响因子：
11.4
通讯作者：
B. Traynor;Ciara Mulcahy;Hugo Uvegi;Tunahan Aytaş;N. Chanut;E. Olivetti
中科院分区：
文献类型：
--
作者：
B. Traynor;Ciara Mulcahy;Hugo Uvegi;Tunahan Aytaş;N. Chanut;E. Olivetti
研究了水化学环境对钢包炉钢渣和铜渣中原生相γ-C2 S和铁橄榄石溶解速率的影响。将γ-C2 S和铁橄榄石暴露于NaOH和Ca（OH）2溶液中，选择这些溶液以模拟碱活化和波特兰水泥基粘结剂的孔溶液。γ-C2 S和铁橄榄石的溶解速率随pH值的升高而降低，而铁橄榄石的溶解速率随pH值的升高而升高，两者的关系均可用经验函数R =k aH+n来描述。这两种矿物的溶解速率对pH值的对比依赖性归因于在溶解过程中两种矿物上形成的化学上不同的表面层。这些结果对于在一系列含水化学环境中混合具有高橄榄石含量的矿渣具有重要意义。
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 formR=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.