Currently, aluminum smelters are in demand for alumina of a higher physical quality. Therefore, many studies are aimed at obtaining sand alumina. The method of obtaining sand alumina proposed by the St. Petersburg Mining Institute and the process of alumina structure formation are considered. Much attention is paid to the induction period of the carbonization process, since the formation of the structure of coarse-grained hydroxide occurs precisely in this period. An analysis of the relationship between the induction period during carbonization and the structure of the future main phase released from the aluminate solution during mass crystallization, the mechanism of the induction period in the carbonization process is given. The proposed method of alumina production is at the stage of scientific research and is not yet ready for implementation.
