Beta
11657

INFLUENCE OF THERMALLY TREATED PHOSPHOGYPSUM ON THE PROPERTIES OF PORTLAND SLAG CEMENT

Article

Last updated: 22 Jan 2023

Subjects

-

Tags

Botany
Microbiology
Zoology

Abstract

In this study, thermal treatment of phosphogypsum(PG) at different temperatures 200,400,600 and 800 oC were attempted to purify PG  and improve its quality to make it fit for the manufacture of Portland slag cement (PSC). PG is a waste of phosphoric acid manufacturing by dehydrate process in Egypt. It is a fine powder with high calcium sulphate content. This waste causes various environmental problems when discharged directly to the environment. The thermally treated PG was found to have lesser amount of impurities of phosphates, fluorides and organic matter than the impure material. In this investigation, preparation of Portland slag cement (PSC) in laboratory was carried out by mixing Portland cement clinker (PCC) and Blast-furnace slag (BFS) with thermally treated PG at different temperatures instead of raw gypsum (RG). The characteristics of prepared mortars were investigated by determination of compressive strength, bulk density and total porosity. The hydration kinetics of cement mortars was evaluated by determination free lime and chemically combined water contents. IR spectroscopic analysis was used to investigate the change in structure of mortars after curing... The change in morphology and microstructure of some hardened pastes were investigated by scanning electron microscopy (SEM) tests. The results show that, Portland slag cement produced using 6% thermally treated PG at 800oC improves its hydraulic properties.

DOI

10.21608/absb.2006.11657

Keywords

Thermal treatment, phosphogypsum, Clinker, Blast furnace slag, Slag cement

Authors

First Name

M.

Last Name

TAHER

MiddleName

-

Affiliation

Chemistry Dept., Faculty of Science, Al-Azhar University, Assiut, Egypt

Email

mahmoudtaher@hotmail.com

City

-

Orcid

-

Volume

17

Article Issue

Issue 2-A

Related Issue

2158

Issue Date

2006-12-01

Receive Date

2006-08-15

Publish Date

2006-12-01

Page Start

15

Page End

26

Print ISSN

1110-2535

Online ISSN

2636-3305

Link

https://absb.journals.ekb.eg/article_11657.html

Detail API

https://absb.journals.ekb.eg/service?article_code=11657

Order

8

Type

Original Article

Type Code

520

Publication Type

Journal

Publication Title

Al-Azhar Bulletin of Science

Publication Link

https://absb.journals.ekb.eg/

MainTitle

-

Details

Type

Article

Created At

22 Jan 2023