Research of the Process of Obtaining Monocalcium Phosphate from Unconditional Phosphate Raw Materials
Anarbayev A. Kabylbekova B. Khussanov Z. Smailov B. Anarbaev N. Kulikov Y.
April 2025Multidisciplinary Digital Publishing Institute (MDPI)
ChemEngineering
2025#9Issue 2
The article presents methods for processing low-grade phosphate raw materials from the Chilisay deposit using a circulation method to produce mineral fertilizers and feed monocalcium phosphate. A study was conducted on the process of obtaining high-quality monocalcium phosphate, and optimal parameters for the decomposition of low-grade phosphate raw materials were determined. Based on the research, it was established that for the decomposition of phosphate raw materials, phosphoric acid with a concentration of 36–42% P2O5 should be used; the recycle phosphoric acid rate should be 540–560% of the stoichiometric amount required for the formation of monocalcium phosphate (MCP); the decomposition temperature should be 95–100 °C; the decomposition duration should be 40–50 min; the filtration temperature of the insoluble residue should be 85–90 °C; the crystallization temperature of MCP should be 40–45 °C; and the crystallization duration should be 85–90 min. For the sulfation of the mother solution and the production of recycle phosphoric acid, sulfuric acid with a concentration of 86–93% H2SO4 should be used; the sulfuric acid rate should be 95–100% of the stoichiometric amount required for the decomposition of dissolved Ca(H2PO4)2. After drying the wet residue, monocalcium phosphate was obtained with the following composition: P2O5—55%, Ca—18.01%, H2O—4.0%, F—0.01%, As—0.004%, Pb—0.002%. The obtained monocalcium phosphate is used in agriculture as a mineral fertilizer and feed monocalcium phosphate.
mineral fertilizers , monocalcium phosphate , phosphate raw materials , phosphoric acid
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Department of Technology of Inorganic and Petrochemical Industries, M. Auezov South Kazakhstan University, Shymkent, 160012, Kazakhstan
Department of Chemistry and Foundations of Chemical Technology, M. Auezov South Kazakhstan University, Shymkent, 160012, Kazakhstan
Testing Regional Laboratory of Engineering Profile “Structural and Biochemical Materials”, M. Auezov South Kazakhstan University, Shymkent, 160012, Kazakhstan
Department of Technology of Inorganic and Petrochemical Industries
Department of Chemistry and Foundations of Chemical Technology
Testing Regional Laboratory of Engineering Profile “Structural and Biochemical Materials”
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