This work examines the acid decomposition of washed calcined phosphoconcentrate using a mixed secondary sulfuric and extraction phosphoric acid feed (H₂SO₄:H₃PO₄ = 1:0.75) across a dosage range of 50–110 units. Products were characterized by total, citrate-soluble and water-soluble P₂O₅, free P₂O₅, total CaO and nitrogen content; structural changes were analyzed by FTIR spectroscopy. Increasing acid dosage enhanced conversion of mineral phosphorus into plant-available fractions and promoted ammonium incorporation after neutralisation, while reducing CaO content. FTIR results confirmed orthophosphate formation and ammonium-phosphate bonding, supporting the production of liquid complex fertilizer precursors. Optimal balance between available phosphorus and controlled free acidity was achieved at 85–95 units. The study provides process-relevant recommendations for up-scaling using secondary acid streams.
| Mualliflar | Shermatov, Akramjon, Sherkuziyev, Doniyor |
|---|---|
| Jurnal | Наманган муҳандисликтехнология институти илмийтехника журнали |
| Nashr sanasi | 2026-03-30 |
| Jild | 11 |
| Son | 1 |
| Betlar | 195-201 |
| Til | Ingliz |
| DOI | 10.61151/stjniet.v11i1.999 |
DOI: 10.61151/stjniet.v11i1.999 · Maqolaning asl sahifasi
Acid decomposition, Washed calcined phosphoconcentrate, Secondary sulfuric acid, Extraction phosphoric acid, Available phosphorus, Ammonium phosphate, FTIR, Process optimization
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