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Re-evaluation of several heavy metals removal by natural limestones

Ali SDIRI,Samir BOUAZIZ

《化学科学与工程前沿（英文）》 2014年第8卷第4期页码 418-432 doi: 10.1007/s11705-014-1455-5

摘要： Different treatment technologies have been efficiently applied to remove heavy metals from wastewater. Efforts have been made to find out the most economic water treatment technology by using low cost and easily accessible natural materials. On the other hand, heavy metals are the most threatening groundwater contaminants because of their toxicity and harmful effects on human and biota. This review discusses the use of natural geological materials for heavy metal removal in aqueous systems. Special attention has been devoted to natural limestone through a systematic inventory of relevant published reports. The removal of toxic metals may include different mechanisms (e.g., physisorption, chemisorptions, precipitation, etc.), depending on the physico-chemical properties of the material and the removed metal. Sorption of toxic metals (e.g., Pb, Cu, Cd, Zn, Cr, Hg, etc.) onto natural limestone involved precipitation of metal carbonate as a predominant removal process, but often subordinated by adsorption and ion exchange, depending on the physico-chemical properties of the studied limestone.

关键词： limestone heavy metals sorption wastewater passive treatment technology

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Degradation of permeability resistance of high strength concrete after combustion

LI Min, QIAN Chunxiang, KAO Hongtao

《结构与土木工程前沿（英文）》 2008年第2卷第3期页码 281-287 doi: 10.1007/s11709-008-0031-9

摘要： To evaluate the remaining durability of concrete materials after combustion, the permeability of high strength concrete (HSC) after combustion was studied. The transport behavior of chloride ion, water and air in concrete after combustion and the effect of temperature, strength grade, and aggregation on the permeability of HSC after combustion are investigated by chloride ion permeability coefficient (), water permeability coefficient () and air permeability coefficient (). The experiment results show that all three permeability coefficients commendably reflect changes of permeability. The permeability coefficient increases with the evaluation temperature. After the same temperature, the permeability coefficient of HSC is lower than that of normal strength concrete (NSC). However, the degree of degradation of permeability coefficient of HSC is greater than that of NSC. The permeability resistance of HSC containing limestone is better than that of HSC containing basalt. Combining changes of compressive strength and permeability, the remaining durability of concrete materials after combustion is appropriately evaluated.

关键词： transport behavior limestone durability permeability HSC

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基于GA-ANFIS在石灰矿技术经济系统中的参数优化研究与应用实践

杨仕教,戴剑勇,曾晟

《中国工程科学》 2005年第7卷第6期页码 61-65

摘要：

为掌握水泥原料矿山系统中的技术经济参数对矿石成本影响的关联规律性，首先运用自适应模糊神经网络对矿山技术经济系统建模，再用并行遗传算法对模型求解，得到了确保矿石成本最小的各项最优技术经济指标，为提高矿山生产管理与经济效益提供了重要的参考价值。

关键词：自适应模糊神经网络并行遗传算法技术经济参数

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建材非金属矿产资源强国战略研究

顾真安,同继锋,崔源声,彭寿,苏桂军,周洪锦,冯惠敏,赵飞,田桂萍,孟庆洁,洪伟

《中国工程科学》 2019年第21卷第1期页码 104-112 doi: 10.15302/J-SSCAE-2019.01.015

摘要：

本文研究我国主要建材产品生产所用的水泥灰岩、玻璃用硅质原料、建筑卫生陶瓷用黏土矿原料（高岭土）、高纯石英和石墨五种非金属矿产资源的强国建设战略，确定建材非金属矿产资源发展的战略思路与目标，指出加强矿区规划与保护、建设供应示范基地和标准原料基地、加快推进战略性资源储备制度等重点任务，提出设立矿产资源强国建设领导小组、完善矿产资源原料产品标准体系建设、加强人才培养体系建设、加强矿产资源法律法规制定与实施等保障措施。

关键词：建材强国战略水泥灰岩玻璃用硅质原料建筑卫生陶瓷用黏土矿原料（高岭土）高纯石英石墨