Influence of the calcium content on the coal fly ash features in some innovative applications

被引：47

作者：

Catalfamo, P ^{[1
]}

DiPasquale, S ^{[1
]}

Corigliano, F ^{[1
]}

Mavilia, L ^{[1
]}

机构：

[1] UNIV MESSINA, DIPARTIMENTO CHIM IND, I-98166 SANT AGATA DI MESSINA, ITALY

来源：

RESOURCES CONSERVATION AND RECYCLING | 1997年 / 20卷 / 02期

关键词：

fly ash; heavy metal; waste; zeolite; calcium;

D O I：

10.1016/S0921-3449(97)00013-X

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Despite a low chemical reactivity, recent trends in the innovative uses of coal fly ash based on the chemical properties have been successful. Lots of fly ash showing sharply alkaline reaction (water pH rising to 11-12 upon contact) usually are high-calcium (> 3-4%), most of which is present as CaO. These lots are suitable to be used as remotion agents of heavy metals in wastewater or retentive agents of them in polluted solids. Lots giving substantially neutral reaction are usually low-calcium (0-3%). They are suitable for conversion by hydrothermal treatments into zeolitic products, where higher calcium contents interfere. A reverse destination is destitute of good results. Causes are discussed. (C) 1997 Elsevier Science B.V.

引用

页码：119 / 125

页数：7

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