The data available from the literature are analyzed. The complex behavior of calcium in aluminate solutions was studied. The scattered results obtained in studying the calcium transformations in aqueous solutions containing aluminate ion are summarized and presented in the form of a scheme and phase diagram, which are useful for the development of lime technologies in various industries, including alumina production. In addition, the phase diagram outlines the most technologically important fields of research intended for obtaining desired products and is also suitable for forecasting processes.
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