Extraction of P₂O₅ from the mineralized mass of the Central Kyzylkum using acidic wastewater generated from cotton soapstock processing: scientific analysis based on equilibrium principles

This study explores the prospects of extracting phosphorus pentoxide (P₂O₅) from the mineralized mass of the Central Kyzylkum region using acidic wastewater (AWW) derived from cottonseed soapstock processing. The acidic components within the AWW were found to facilitate the decomposition of solid-phase phosphorite material. Experiments were conducted at 333 K under varying AWW-to-mineralized mass (AWW:MM) ratios ranging from 100:10 to 100:40. The concentration of P₂O₅ was determined using a photometric method at a wavelength of 440 nm. The research was based exclusively on the analysis of the solid phase, where the extent of the reaction was assessed through the quantity of precipitate formed. It was demonstrated that an increase in pH had a direct effect on P₂O₅ extraction. The reduction in CaO content followed an exponential trend, while the P₂O₅ release exhibited a logarithmic relationship with pH. The equilibrium reactions between ions were interpreted within the framework of chemical mechanisms. Experimental results were expressed through graphical analysis and regression modeling using OriginPro 2021. The obtained data were mathematically modeled with high reliability, as indicated by coefficients of determination (R²) exceeding 0.95. This approach offers a cost-effective, waste-based alternative technological method for phosphorus extraction, utilizing industrial by-products while maintaining environmental and economic feasibility.

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