INVESTIGATION ON MSW FLY-ASH TREATMENT BY REACTIVE CALCIUM ALUMINATES AND PHASES FORMED

被引：38

作者：

AUER, S ^{[1
]}

KUZEL, HJ ^{[1
]}

POLLMANN, H ^{[1
]}

SORRENTINO, F ^{[1
]}

机构：

[1] ZI PARC CHESNES,LAFARGE COPPEE RECH,F-38291 ST QUENTIN FALLAV,FRANCE

来源：

CEMENT AND CONCRETE RESEARCH | 1995年 / 25卷 / 06期

关键词：

D O I：

10.1016/0008-8846(95)00127-X

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

In this study hydration reactions of MSW fly ash with an experimental C(12)A(7) / C(3)A - cement are investigated. The fly ash has high contents of soluble calcium sulphates, alkali chlorides and heavy metals. During the first hours the calcium aluminates react with the calcium sulphate to form ettringite. On condition that the amount of added cement is sufficient, after complete consumption of calcium sulphates further hydration leads to additional crystallization of Friedel's salt. The same course of hydration Is found for synthetic model mixtures of calcium aluminate + gypsum + alkali chlorides. TEM/EDX-analysis indicates that ettringite is able to incorporate the heavy metals Pb and Zn by substitution, but no contents of Cl- are detected. Treatment by reactive calcium aluminates could be a suitable method for the immobilization process of a wide range of toxic wastes.

引用

页码：1347 / 1359

页数：13

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