March/April 2013

Canadian Metallurgical Quarterly

Excerpts taken from abstracts in CMQ, Vol. 50, No. 2.
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Effect of mechanical activation on carbothermal reduction of chromite with graphite

F. Apaydin, Bartin University, Metallurgy & Materials Engineering, Bartin, Turkey; A. Atasoy, Sakarya University, Tech. Edu. Fac., Extractive Metallurgy, Sakarya, Turkey; and K. Yildiz, Sakarya University, Metallurgy & Materials Engineering, Sakarya, Turkey

ABSTRACT The carbothermal reduction of mechanically activated chromite with graphite under an argon atmosphere was investigated at temperatures between 1100 and 1400°C and the effects of the mechanical activation on chromite structure were analyzed by X-ray diffraction, scanning electron microscopy and specific surface area measurement. An increase in specific surface area resulted in more contact points. The activation procedure led to amorphization and structural disordering in chromite, and accelerated the degree of reduction and metallization in the mixture of chromite and graphite.

Variation of dimensional properties of particulate materials during grinding and their non fractal nature

E. Stamboliadis, E. Petrakis and O. Pantelaki, Technical University of Crete, Chania, Greece

ABSTRACT Dimensional properties of a particulate material are considered to be the mass, the surface area, the length and the number of its particles. The paper examines the variation of the distribution of these properties versus size as a function of the energy consumption during grinding. The data obtained show that the distributions of these properties have one maximum and one minimum size limit. Additionally the presentation of the cumulative distribution of each of these properties, versus size between these two limits can be approximated by an exponential curve, which if plotted in a log-log diagram gives an almost linear relationship. However, only about 50% of the data can be described by this linear relationship. The question that rises is whether these properties can be considered to be fractal.

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