Abstract
Fusions of compositions spaced at intervals throughout the magnesia-silica system were prepared in an electric arc furnace. Potter's flint and precipitated magnesium carbonate were used as starting materials for one series of samples, and olivine, quartz sand, and magnesite were used as lower purity raw materials in a second series to simulate commercial conditions. Chemical, spectrographic, microscopic-petrographic, density, and pyrometric cone equivalent (P.C.E.) determinations were made on typical specimens selected from each melt. Periclase, forsterite, and clinoenstatite crystallized in strict agreement with the phase diagram, and the phenomenon of immiscible silicate phases was observed in high silica compositions. No new compounds, however, were seen. The possibility of beneficiating olivine for refractory service by electric furnacing was also investigated.
Published Version
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