Microstructure and reactivity of calcined mud supported limestones

Soltan, AbdelMonem ; Kahl W. ; Kahl W. ; Wendschuh M. ; Hazem M. 


Abstract


The petrographic characteristics of mud supported limestone samples from Egypt were examined before and after calcination at 950uC for 0.25, 0.5, 1 and 2 h. X-ray diffraction (XRD), X-ray fluorescence (XRF), transmitted light microscopy (TLM), scanning electron microscopy (SEM) and X-ray microcomputed tomography (μ-CT) were used for technological samples characterisation. Both the free lime content and the hydration behaviour of the resulted quicklime after calcination were measured. The produced lime is unreactive at all applied firing conditions, except the Chalk lime at 1 and 2 h soaking, despite the high free lime content of the samples. The microstructure of the mud supported limestones is of significance on the resulted quicklime reactivity, where microfractures are formed along the cavities inside the microfossils. The mineralogical and the chemical compositions of the studied mud supported limestones are the main controlling variables on the degree of the quicklime crystallinity and consequently the reactivity. Samples enriched with P 2O 5 show higher crystallinity of the resulted lime crystallites associated with lowest reactivity. © 2012 Institute of Materials, Minerals and Mining and The AusIMM Published by Maney on behalf of the Institute and The AusIMM.


Other data

Issue Date 12-Mar-2012
Publisher TAYLOR & FRANCIS AS
Journal Transactions of the Institutions of Mining and Metallurgy, Section C: Mineral Processing and Extractive Metallurgy 
URI http://research.asu.edu.eg/handle/123456789/170108
DOI 1
5
https://api.elsevier.com/content/abstract/scopus_id/84857861766
121
10.1179/1743285511Y.0000000024


Recommend this item

CORE Recommender

Items in Ain Shams Scholar are protected by copyright, with all rights reserved, unless otherwise indicated.