Leaching characteristics of biomass ash-based binder in neutral and acidic media
Leaching characteristics of biomass ash-based binder in neutral and acidic media
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DOI：
10.1016/j.cemconcomp.2019.04.001
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发表时间：
2019-07-01
影响因子：
10.5
通讯作者：
Olivetti, Elsa
中科院分区：
文献类型：
--
作者：
Chaunsali, Piyush;Uvegi, Hugo;Olivetti, Elsa
生物质灰是燃烧农业残渣产生的，在许多发展中国家，农业残渣是中小型工业发电的主要来源。本研究的重点是由印度生物质灰、印度恒河粘土、消石灰和1M氢氧化钠水溶液合成的粘结剂的性能。为了测量浸出的程度及其对物理化学性质的影响，将粉状生物质灰粘结剂(<；45µm)暴露在两种不同的淋溶介质中：去离子水和0.1MHNO3，两种不同的液样比(按重量计)。10%和10%。钠浸出在生物质灰粘结剂中被发现是突出的，与浸出介质和溶液与样品的比例无关。然而，0.1M硝酸溶液中钙的浸出量显著高于去离子水中。生物质灰粘结剂中存在的水化硅酸钙在0.1M HNO3中化学稳定性较差，在溶液与样品比为100时表现出完全的钙浸出。此外，钙在0.1M硝酸溶液中的显著淋溶导致了生物质灰结合料的主要反应产物--水合硅酸钙的相变。
Biomass ash results from the combustion of agricultural residues, which, in many developing countries, are a primary source of power generation for small and medium size industries. This study focuses on the performance of a binder synthesized from an Indian biomass ash, Indo-Gangetic clay, hydrated lime, and aqueous 1M NaOH solution. To measure the extent of leaching and its impact on physicochemical properties, the biomass ash binder in powder form (< 45 mu m size) was exposed to two different leaching media: deionized water and 0.1M HNO3 at two different solution-to-sample ratios (by wt.) of 10 and 100. Sodium leaching was found to be prominent in the biomass ash binder irrespective of leaching medium and solution-to-sample ratio. However, calcium leaching was significantly higher in 0.1M HNO3 than in deionized water. Calcium silicate hydrate present in the biomass ash binder was found to be less chemically stable in 0.1M HNO3, exhibiting complete calcium leaching at a solution-to-sample ratio of 100. Furthermore, significant leaching of calcium in 0.1M HNO3 solution resulted in phase modification of calcium silicate hydrate, the main reaction product of the biomass ash binder.