OPTIMIZATION OF THERMAL ACTION ON EGYPTIAN KAOLINITE FOR PRODUCTION OF GEOPOLYMERIC BINDER USING SOLID WASTES OF ALUMINUM SULPHATE INDUSTERY IN EGYPT

Document Type : Review Article

Authors

1 Aluminum Sulfate Company of Egypt

2 Institute of Environmental Studies and Research, Ain Shams University

3 Faculty of Engineering, Cairo University

Abstract

Geopolymeric binders made from a range of various aluminum silicate source materials such as fly ash, blast furnace slag and kaolinite. Fly ash isn’t available in Egypt and the blast furnace slag isn’t available in the required characteristics. Therefore, Egyptian kaolinite is available and can be used for preparation of Meta kaolinite as a constituent for geopolymer manufacturing. This work aims at investigating the optimum temperature for kaolinite activation. Meta-kaolinite was prepared by thermal treatment of raw kaolinite obtained from high quality kaolin deposits intercalated sedimentary rocks in south Sinai (Egypt). The optimal parameters for complete de-hydroxylation of kaolinite were achieved, such as temperature at 700 ̊C and heating for 90 minutes. The conversion of kaolinite to meta-kaolinite was confirmed by XRD, IR analysis of raw kaolinite and meta-kaolinite. The pozzolanic activity was determined by Chappelle test, the obtained value of 0.74 g Ca(OH)2/g meta-kaolinite indicating that the prepared meta-kaolinite can be used as pozzolanic material and acts as cementitious material and activated aluminum silicate source for preparation of geopolymeric binder.
Key words: Kaolin, calcined kaolinite, Geopolymer, Dealuminated meta-kaolinite (DMK), Meta-Kaolinite (MK).

Main Subjects

Journal of Environmental Science
Volume 50, Issue 4 - Serial Number 4
P.1: Basic Science
April 2021
Pages 1-22

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