Study of Chrome ores for Refractory Industry: Part-II-Chemical composition and Refractory properties of Indian Chromites

Abstract

In an earlier paper, the mineralogical composition and origin of sixteen Indian chromites have been given. Present study is connected with chemical composition of the ores and of isolated chromite grains. The chemical analysis of the ores, and its mineralogical composition, are taken into consideration in consideration in assessing the utility of the ore for refractory purposes. Best quality refractory grade ores should contain over 40% Cr2O3 and less than 15% FeO and Fe2O3. Silica and lime, occurring in the gangue, should be below 5% and1% respectively. However, lower quality ores also are used, within tolerable variation of these constituents. The presence of large amounts of iron oxide which is combined in the spinal is deleterious from the point of view of burning expansion during heating or in use in the furnaces.