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The results of a study of the complex treatment of alumina–silica-containing materials (fly ash, low-duality bauxites, clays, kaolins, nephelines) by chemical enrichment are presented. The de-siliconization of aluminum-containing raw materials with a high silica content is based on the property of hydroaluminum silicates (which are basic silica-containing minerals) to undergo intramolecular phase...