Some Effects of Microwave Heating of Chromite Ore for Fe-CrAl Alloys by Aluminothermy
Journal Title: Analele Universitatii "Dunarea de Jos" din Galati. Fascicula IX, Metalurgie si Stiinta Materialelor - Year 2011, Vol 34, Issue 4
Abstract
Processes and prime materials involved in Fe-Cr-Al alloys production by aluminothermy are presented having in view new possibilities to produce them more ecological and more efficient, using energy of microwave field. The capacity of heating pieces of chromite ore containing 56.52 %mass Cr2O3 and a ratio (% massCr2O3/ %massFeO)=2.622 in a domestic microwave oven is evaluated at the maximal power of the microwave field of 700W where a maximal temperature about 2600 C was obtained after 16minutes heating. A rapid cooling from this temperature to 200 C, by water immersion induces an increasing of the internal voids due to new cracks and the development of pre-existing cracks of about 0.15-0.29 %, which helps to reduce the energy consumption in chromite comminution. The final heating temperatures show a low possible contribution to the reduction of energy consumptions in direct metallurgical processes on the account of chromite ore heating in microwave field.
Authors and Affiliations
Petre Stelian NIȚĂ
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