Main Article Content
In this article obtaining complex nitrogen-phosphate fertilizers based on activation of phosphorite powder with partially ammoniated mix of phosphoric and sulphuric acids have been studied. In order to reduce the foaming of the process, for the first time a partially ammoniated mix of acids was used. The optimal technological parameters for activation phosphorite powder with partially neutralized mixes of sulphuric and phosphoric acids are the followings: the mix of sulphuric and phosphoric acids with a ratio of SО3:Р2О5 = 1.2; рН of acids – 2.5; weight ratio of ammonium sulphate-phosphate slurry towards phosphorite powder is 100 : 20; temperature is 60°С; duration is 30 min. The composition nitrogen-phosphate fertilizers obtained in optimal condition contains (wt., %): N – 11.55; Р2О5total -24.61; Р2О5acceptable by citric acid -21.66; Р2О5 acceptable by EDTA -20.24; Р2О5water-soluble -13.02; CaOtotal -13.59; СаОacceptableby citric acid -11.43. In that condition, granulated products of nitrogen-phosphate can be produced with high strength. The advantage of offered promising technology concludes in reduction two times expenditure of the most expensive ammonia in comparison with ammonium sulphate production and an increase in gross domestic product.
Namazov Sh S, Reymov АМ, Alimov UK. Complex fertilizers from mineralized mass from Central Kyzyl Kum phosphorite and partially ammoniated wet-processing phosphoric acid. Uzbek Chemical Journal. 2008;4:27-31.
Alimov UK, Reymov АМ, Namazov Sh. S, Beglov BМ. Preparation of concentrated phosphorous fertilizers by decomposition powder-like fraction from Central Kyzyl Kum phosphorite with partially ammoniated wet-processing phosphoric acid. Chemical Industry. 2008;85(5):248-255.
Alimov UK, Reymov АМ, Namazov Sh. S, Beglov BМ. Nitrogen-phosphate fertilizers based on interaction of washed concentrate from Central Kyzyl Kum with partially ammoniated wet-processing phosphoric acid. Report of AS of RUz. 2009;6:63-69.
Seytnazarov АR, Erkaev АU, Namazov Sh. S, Beglov BМ. Obtaining nitrogen-phosphate fertilizers by decomposition of phosphorites from central Kyzyl Kum with partially ammoniated wet-processing phosphoric acid from Karatau phosphorite. Report of AS RUz. 2002;1:53-55.
Seytnazarov А.R. Investigation of foaming when interaction of high calcareous containing Tashkura phosphorite with ammoniated wet-processing phosphoric acid. Uzbek Chemical Journal. 2010;3:81-83.
Orehov II. Some ways for intensification of decomposition process of natural phos phates with phosphoric acid. Inorganic substances technology – Leningrad. Publishing House of Leningrad State University. 1975;43-49.
Orehov II, Tereshenko L. Ya, Stepanova NI. On effect of introduction of sulphate-ions on speed of natural phosphates interaction with phosphoric acid. Proceeds of Northern-Western of Postal Polytechnic Institute. 1969;6:60- 64.
Kanoatov HМ, Seytnazarov АR, Namazov Sh. S, Beglov BМ. Phosphoric acid activation of Central Kyzyl Kum phosphorites. Chemical technology. Control and Management. 2008;4:5-11.
Suetinov АА, Klassen PV, Varfolomeev VА, Novikov АА, Sadikov КG, Коnonov АV, Brodskiy АА, Kipriyanov Yu. I, Zaytsev VА. B.I. Patent No 1017697 USSR Cl. СО5 В 11/04. Method for obtaining phos phate fertilizer. 1983;18.
Sadykov BB, Volinskogova NV, Namazov Sh. S, Beglov BМ. Production of ammonium sulphate-phosphate from Central Kyzyl Kum phosphorites. Chemical Industry. 2007;84(3):122-126.
Sadykov BB, Volinskogova NV, Sattarov Т, Namazov Sh. S, Beglov BМ. Density and viscosity of the mix wet-processing phosphoric acid and sulphuric acid. Chemical technology. Control and Management. 2007;5:9-12.
Sadykov BB, Volinskogova NV, Sattarov Т, Namazov Sh. S, Beglov BМ. Composition, regime of obtaining and commodity properties of ammonium sulphate-phosphate. Chemical technology. Control and Management. 2008;5-10.
Methods of analyses of phosphate raw materials, phosphoric and complex fertilizers, feed phosphates М.М.Vinnik, N.Еrbanova P.М. Zaytsev. Moscow. Chemistry. 1975;218.
State Standard 21560.2-82. Mineral fertilizer. Technique of tests. Moscow. State standard. 1982;30.