A detailed understanding of the composition,buffering capacity,surface charge property,and metals leaching behavior of bauxite residue is the key to improved management,both in reducing the environmental impact and us...A detailed understanding of the composition,buffering capacity,surface charge property,and metals leaching behavior of bauxite residue is the key to improved management,both in reducing the environmental impact and using the material as an industrial by-product for other applications.In this study,physical,chemical,and surface charge properties of bauxite residue derived from a combined process were investigated.Results indicated that the main alkaline solids in bauxite residue were katoite,sodalite,and calcite.These minerals also lead to a higher acid neutralizing capacity of bauxite residue.Acid neutralizing capacity(ANC)to pH 7.0 of this residue is about 0.9 mol H^+/kg solid.Meanwhile,the Fe-,Al-,and Si-containing minerals in bauxite residue resulted in an active surface;The isoelectric point(IEP)and point of zero charge(PZC)were 7.88 and 7.65,respectively.This also leads to a fact that most of the metals in bauxite residue were adsorbed by these surface charged solids,which makes the metals not readily move under natural or even moderately acidic conditions.The leaching behavior of metals as a function of pH indicated that the metals in bauxite residue present low release concentrations(pH>3).展开更多
建筑信息模型(BIM)技术能够促进建筑行业的提质增效。为推动BIM技术在既有建筑中的应用,本研究以web of science核心合集数据库为数据源,梳理相关文献以拓展BIM技术在既有建筑中应用的广度。研究利用CiteSpace软件进行文献可视化分析,...建筑信息模型(BIM)技术能够促进建筑行业的提质增效。为推动BIM技术在既有建筑中的应用,本研究以web of science核心合集数据库为数据源,梳理相关文献以拓展BIM技术在既有建筑中应用的广度。研究利用CiteSpace软件进行文献可视化分析,结果表明自2018年起BIM技术在既有建筑中的应用受到广泛关注,发文量排名前三的国家分别是中国、美国和英国。研究从逆向建模、运营管理以及改造、拆除与回收三大领域,详细梳理了BIM技术在既有建筑中应用的研究进展。研究发现,BIM技术在既有建筑中的应用存在数据集成、处理和展示方面的局限性。建议未来研究应从内部开发BIM云服务、定制信息检索功能以及建立统一的BIM技术标准;外部则需结合物联网、机器学习以及扩展现实技术,提升BIM数据集成的全面性,实现数据处理的自动化,增强数据展示的沉浸感。展开更多
基金Projects(41501350,41461071,31860170)supported by the National Natural Science Foundation of China
文摘A detailed understanding of the composition,buffering capacity,surface charge property,and metals leaching behavior of bauxite residue is the key to improved management,both in reducing the environmental impact and using the material as an industrial by-product for other applications.In this study,physical,chemical,and surface charge properties of bauxite residue derived from a combined process were investigated.Results indicated that the main alkaline solids in bauxite residue were katoite,sodalite,and calcite.These minerals also lead to a higher acid neutralizing capacity of bauxite residue.Acid neutralizing capacity(ANC)to pH 7.0 of this residue is about 0.9 mol H^+/kg solid.Meanwhile,the Fe-,Al-,and Si-containing minerals in bauxite residue resulted in an active surface;The isoelectric point(IEP)and point of zero charge(PZC)were 7.88 and 7.65,respectively.This also leads to a fact that most of the metals in bauxite residue were adsorbed by these surface charged solids,which makes the metals not readily move under natural or even moderately acidic conditions.The leaching behavior of metals as a function of pH indicated that the metals in bauxite residue present low release concentrations(pH>3).
文摘建筑信息模型(BIM)技术能够促进建筑行业的提质增效。为推动BIM技术在既有建筑中的应用,本研究以web of science核心合集数据库为数据源,梳理相关文献以拓展BIM技术在既有建筑中应用的广度。研究利用CiteSpace软件进行文献可视化分析,结果表明自2018年起BIM技术在既有建筑中的应用受到广泛关注,发文量排名前三的国家分别是中国、美国和英国。研究从逆向建模、运营管理以及改造、拆除与回收三大领域,详细梳理了BIM技术在既有建筑中应用的研究进展。研究发现,BIM技术在既有建筑中的应用存在数据集成、处理和展示方面的局限性。建议未来研究应从内部开发BIM云服务、定制信息检索功能以及建立统一的BIM技术标准;外部则需结合物联网、机器学习以及扩展现实技术,提升BIM数据集成的全面性,实现数据处理的自动化,增强数据展示的沉浸感。
