Thermodynamic investigation of briquette obtained from waste fayalite with calcium carbide
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2017-01-01
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Abstract
The iron content in fayalite, wasted from the copper production, is high and can be used as a raw material in the ferrous extractive metallurgy. This material has a fine dispersal structure, and it is necessary to be agglomerated for next refining processes. An experimental investigation for briquetting was carried out. X-Ray analysis of the initial sample showed fayalite and magnetite as main phases. Thermodynamics of the reduction of the fayalite using calcium carbide as a reductor was studied. Calcium carbide was used also as a regulator of the basicity of the charge. The experiments were carried out at ratios for fayalite - calcium carbide 1:1 and 1:10, relative to the stoichiometrically calculated quantity of calcium carbide, in the temperature range from 773 K to 1173 K. The oxygen potential, respectively Gibbs energy, has been calculated using EMF method with galvanic cell with solid electrolyte ZrO2 (Y2O3) and reference electrode Ni/NiO. Equations for DGT = f (T) for different temperature ranges were derived from the data experimentally obtained. The obtained briquettes were heat treated at temperatures 1125 K and 1423 K. The toughness, physical and mineral structure of the heated briquettes, were investigated. It was established that the melting temperature of the investigated mixtures decreased by increasing the amount of calcium carbide.