Preparation of Zeolite from Recycled Alumina and Modified Bentonite

This study investigated the organic constituents of alumina waste generated as a byproduct of polyethylene production. Organic compounds adsorbed on spent hexane-saturated alumina were recovered using Soxhlet extraction, followed by solvent evaporation, derivatisation and IR spectroscopic analysis. The results confirmed the presence of diverse organic functional groups on the alumina surface. The principal objective was to establish a feasible route for synthesising artificial zeolite from recycled alumina for efficient natural gas purification. In this context, the spent alumina was evaluated as a secondary raw material and its suitability for zeolite preparation was scientifically validated. In addition, bentonite samples collected from four locations of the Azkamar deposit in the Navoi region were systematically modified and characterised. Their potential use as binder components during zeolite granulation was assessed, with particular emphasis on their effects on granule mechanical strength and structural stability. The chemical compositions of the raw and modified spent alumina and Azkamar bentonite samples were compared using X-ray fluorescence analysis. These findings demonstrate that the production of zeolitic materials for gas purification from recycled industrial resources offers significant scientific value and strong practical potential.

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