Table of Contents
Journal of Geochemistry
Volume 2014 (2014), Article ID 451782, 10 pages
http://dx.doi.org/10.1155/2014/451782
Research Article

Electro-Thermal and Semiconductivity Behaviour of Natural Sintered Complex Carbonate Ore for Thermo-Technological Applications

Chemistry Department, Faculty of Science and Arts, Baljarashi, Al-Baha University, P.O. Box 1988, Al-Baha, Saudi Arabia

Received 9 September 2013; Revised 8 December 2013; Accepted 6 January 2014; Published 5 March 2014

Academic Editor: Miguel A. Huerta-Diaz

Copyright © 2014 Loutfy H. Madkour. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The polymetal (Zn, Pb, Fe, Ca, Mg, Cd, Ba, Ni, Ti, and SiO2) complex Umm-Gheig carbonate ore is subjected to sintering treatment at 573, 773, 973 and 1273 K respectively for four hours. Chemical, spectral, X-ray and differential thermal analyses are applied for the native ore as well as for the samples preheated and sintered. The current versus applied DC voltage ( ) characteristics, bulk density , percent shrinkage (% ), activation energy and energy gap are established for the sintered ore. The electrical conductivity , thermal conductivity ( ) and thermoelectric power coefficient have been investigated as a function of applied temperature for the sintered ore materials. The electrical conduction is mainly achieved by free electrons near or in conduction band or n-type. As the sintering temperature increases the conduction of the ore is also increased due to the recombination process taking place between the electrons and holes. Electrons hopping between Fe2+ and Fe3+ are the main charge carriers. The formation of Fe3O4 at high sintering temperature acts as an active mineralizer, thus inducing an increased degree of crystallinity and a more ordered crystal structure is produced.