Simultaneous removal of fluorine and sulfate impurities from phosphoric concentrate using CaCO3 and Ca(H2PO4)2

The objective of this study is to investigate the process of producing environmentally safe and highly watersoluble ammonium phosphate by removing fluorine and sulfate impurities during the extraction of phosphoric acid from phosphorite in the Central Kyzyl Kum region of Uzbekistan and by purifying associated impurities such as iron, aluminum, calcium, magnesium, sulfate, and fluorine during the ammonization stage of the extracted phosphoric acid.For the analysis of experimental results, chemical and physicochemical methods (spectrophotometry, pH measurement, electron microscopy analysis) were utilized, along with statistical processing of experimental data.By removing fluorine and sulfate impurities during the phosphoric acid extraction process, the technological process was simplified, and by further purifying associated impurities such as iron, aluminum, calcium, magnesium, and fluorine from the extracted acid, the content of P 2 O 5 , the key component of the final product, was increased.The research results confirmed that adding calcium carbonate or monocalcium phosphoric to the extracted phosphoric acid (EPA) slurry based on Central Kyzyl Kum phosphorite enables the simultaneous removal of fluorine and sulfate.Furthermore, by completely purifying the partially refined phosphoric acid obtained during the extraction process in the ammonization stage, high-quality, highly water-soluble ammonium phosphate was produced.The resulting product is a fully water-soluble nitrogen-phosphorus fertilizer that can be used as a suitable fertilizer for drip irrigation and hydroponic cultivation of agricultural crops.

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