Effect of thermal treatment on the retention of chemical elements in the structure of lightweight aggregates manufactured from contaminated mine soil and fly ash

被引：48

作者：

Gonzalez-Corrochano, B. ^{[1
]}

Alonso-Azcarate, J. ^{[1
]}

Rodas, M. ^{[2
]}

机构：

[1] Univ Castilla La Mancha, Dept Phys Chem, Fac Environm Sci, Toledo 45071, Spain

[2] Univ Complutense Madrid, Dept Crystallog & Mineral, Fac Geol Sci, E-28040 Madrid, Spain

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2012年 / 35卷

关键词：

Contaminated mine soil; Fly ash; Thermal treatment; Lightweight aggregate; BCR sequential extraction; Leaching; Immobilization; Crystalline structure; Residual fraction; LWA matrix; SEQUENTIAL EXTRACTION; HEAVY-METALS; WASTE INCINERATION; SPECIATION; BEHAVIOR; FRACTIONATION; DIGESTION; SEDIMENTS; TAILINGS; SLUDGE;

D O I：

10.1016/j.conbuildmat.2012.04.061

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

This paper presents a study about the effectiveness of thermal treatment in the immobilization of different chemical elements within the structure of artificial lightweight aggregates (LWAs) manufactured with contaminated mine soil and fly ash. The heat treatment was totally effective in the immobilization of Cr, Ni, Cu, Zn, Pb, Be, Mn, Co and most of the rare earth elements. In the LWAs, they have become part of the residual fraction, probably forming the crystalline structure of neo-formed feldspars, of neo-formed minerals of the spinel group and the matrix. The thermal treatment was detrimental from the standpoint of arsenic leaching. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：497 / 507

页数：11

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