The increasing demand for aluminum around the world is increasing interest in developing alternative technologies for the production of alumina from non-bauxite sources, especially from clay. In this work, the extraction of aluminum from kaolin in the process of leaching using an aqueous solution of hydrochloric acid as a leaching agent is investigated. For this study, samples of burnt kaolin clay from the Chovdardagh deposit were used. Before leaching, crude kaolin was calcined; calcination achieves dehydroxylation of kaolinite, which is the main mineralogical phase of kaolin, and its transformation into metakaolin, an amorphous phase of Al-Si, from which aluminum is easily leached. The calcination of the raw kaolin used in this work was carried out at 750⁰C for 2 h, taking into account that these conditions were recognized as optimal in the corresponding experimental studies to achieve the maximum yield of alumina in solution. It was revealed that the leaching of kaolin clay in order to extract aluminum oxide is achieved using samples of kaolin clay calcined under the above conditions, with 20% hydrochloric acid for 2 hours at a leaching temperature of 95⁰C. The degree of extraction of aluminum and iron oxide under these conditions is 96.7 and 94.1%, respectively

doi.org/10.32737/0005-2531-2023-4-55-62