Abstract
Secondary calcium carbonate accumulations were observed in bauxite processing waste, a waste product of aluminum production. The waste material is saline-sodic, calcareous, and highly alkaline (pH 11.8). The waste was packed as a 50% solids slurry into cylindrical acrylic columns and subjected to treatment combinations of differing drainage regimes, and gypsum and sulfuric acid additions. After eight wetting and drying cycles, samples were taken from the columns for analysis of carbonate distribution and thin-section analysis. Micromorphic forms of carbonate found in the waste included infillings, calcitic coatings and hypocoatings of voids, acicular calcite found in vughs, and calcium carbonate replacing gypsum. These results suggest that secondary calcite forms commonly found in soils may form very rapidly under certain conditions.
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