Reactivity of industrial wastes as measured through ICP‐OES: A case study on siliceous Indian biomass ash
Reactivity of industrial wastes as measured through ICP‐OES: A case study on siliceous Indian biomass ash
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通过 ICP-OES 测量工业废物的反应性:印度硅质生物质灰的案例研究
DOI:
10.1111/jace.16628
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发表时间:
2019
影响因子:
3.9
通讯作者:
Olivetti, Elsa
中科院分区:
文献类型:
--
作者:
Uvegi, Hugo;Chaunsali, Piyush;Traynor, Brian;Olivetti, Elsa
An untapped source of amorphous SiO2, industrially generated Indian biomass ash (SA)—90% amorphous, with composition of ~60% SiO2and ~20% unburnt carbon—can be used to produce cementitious and alkali‐activated binders. This study reports dissolution of amorphous Si from SA in 0.5 mol/L and 1 mol/L aqueous NaOH, with and without added Ca(OH)2, at SA:Ca(OH)2wt% ratios of 100:0, 87.5:12.5, and 82.5:17.5. Monitoring of elemental dissolution and subsequent/simultaneous product uptake by ICP‐OES offers an effective process for evaluating utility of industrial wastes in binder‐based systems. After 28 days in solution, up to 68% of total Si is dissolved from SA in 1 mol/L NaOH, with values as much as 38% lower in the presence of Ca(OH)2, due to the formation of tobermorite‐like C‐S‐H. FTIR,29Si MAS‐NMR, and XRD are used to characterize solid reaction products and observe reaction progress. Product chemistries calculated from ICP‐OES results and verified by selective dissolution in EDTA/NaOH—namely, Ca/Si of 0.6‐1 and Na adsorption of 1‐2 mmol/g—are found to be consistent with those indicated by aforementioned techniques. This indicates the efficacy of ICP‐OES in estimating product chemistry via such a methodology.
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DOI:
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发表时间:
2004
期刊:
影响因子:
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作者:
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2005
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发表时间:
2012
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