Namangan State University (Namangan, Uzbekistan)

Sultonov B. E., Professor, Doctor of Engineering Sciences, bse-chemist-68@mail.ru
Kholmatov D. S., Associate Professor, PhD in Chemical Sciences, Hol.dCo.ltd@mail.ru
Rasulov A. A., Associate Professor, PhD in Engineering Sciences, azamra@mail.ru

Navoi State University of Mines and Technologies (Navoi, Uzbekistan)

Temirov U. Sh., Professor, Doctor of Engineering Sciences, temirov-2012@mail.ru

This article presents the results of nitric acid treatment of phosphate waste, specifically mineralized mass (MM) and slurry phosphorite (SP), produced during the thermal processing of phosphorites from Central Kyzylkum (CK). MM with the following composition (in wt%) was used in the laboratory studies: 14.60 P₂O_{5 tot}, 3.07 P₂O₅ avail, 43.99 CaO, 1.01 MgO, 14.11 CO₂, 1.04 Al₂O₃, 0.89 Fe₂O₃, 1.58 SO₃, 1.30 F, 1.02 Н₂О; CaO : P₂O₅ = 3.01; and 10.82 % as insoluble residue. The SP used had the following composition (in wt%): 11.57 P₂O_{5 tot}, 1.33 P₂O₅ avail, 41.08 CaO, 0.61 MgO, 20.91 CO₂, 1.84 Al₂O₃, 1.48 Fe₂O₃, 0.46 SO₃, 1.52 F; CaO : P₂O₅ = 3.55; and 14.09 % as insoluble residue. The study examined the effects of nitric acid concentration and dosage on the main components of activated phosphate fertilizers, as well as the influence of nitric acid concentration on the relative content of the available P₂O₅ avail and СаОavail in samples of nitrogenphosphate fertilizers (NPF) produced from SP and MM. The laboratory findings were used to establish the optimal concentrations and dosages of nitric acid for producing fertilizers that meet the applicable agricultural requirements. The compositions of the NPF were as follows (in wt%): when using MM: P₂O_{5 tot} of 20.13–20.58, P₂O_{5 avail} (by citric acid) of 10.47–11.72, CaO_tot of 38.87–39.12, СаОavail of 22.30–24.15, CaO_aq of 3.17–3.31, N of 1.27–1.35, with the degree of Р₂О₅ transition to the liquid phase within 2.01–2.06 %; when using SP: P₂O_{5 tot} of 18.29–18.58, P₂O_{5 avail} (by citric acid) of 9.33–10.03, CaO_tot of 39.62–39.96, СаО_avail of 21.98–24.56, CaO_aq of 3.16–3.32, N of 1.27–1.36, with the degree of Р₂О₅ transition to the liquid phase within 2.07–2.12 %.

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