Treating waste phosphogypsum for cement and plaster manufacture

被引：289

作者：

Singh, M ^{[1
]}

机构：

[1] EST Div UA, Cent Bldg Res Inst, Roorkee 247667, Uttar Pradesh, India

来源：

CEMENT AND CONCRETE RESEARCH | 2002年 / 32卷 / 07期

关键词：

phosphogypsum; fluoride; waste management; Portland cement;

D O I：

10.1016/S0008-8846(02)00723-8

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

In the investigation reported in this paper, treatment of phosphogypsum with aqueous citric acid solution was attempted to purify phosphogypsum and improve its quality to make it fit for manufacture of cement and gypsum plaster for the first time. The treatment of gypsum converts phosphatic and fluoride impurities into water-removable citrates, aluminates and ferrates. The findings of chemical and physical tests and differential thermal analysis of the phosphogypsum with and without citric acid treatment established improvement of the treatment for purifying phosphogypsum. The purified phosphogypsum was found to have lesser amount of impurities of phosphates, fluorides and organic matter than the impure material. The Portland and Portland slag cements produced with purified phosphogypsum were found to have strength properties similar to those produced from mineral gypsum, whereas gypsum plaster produced conformed to the relevant Indian Standards. (C) 2002 Elsevier Science Ltd. All rights reserved.

引用

页码：1033 / 1038

页数：6