Ammonium sulfatophosphate producing from the phosphorites of Central Kyzylkum

The necessity of using sulfur-containig fertilizers in agricultural production is evidenced. By neutralizaation with gaseous amonia of a mixture of extractive phosphoric and sulfuric acids the ammonium sulfatophosphates are produced, containing nitrogen, phosphorus and sulfur in various ratio. The regimes for producing them are described and material flows in the industrial manufacturing are given.     

Nitrogen-phosphoric fertilizers obtained by interaction of the concentrated solutions of ammonium nitrate with the mineralized mass of the phosphorites of Central Kyzylkum

The results of determination of composition and strength of the granules of nitrogen-phosphoric fertilizers containing 1.5 to 5.0% of P₂O₅, obtained by interaction of the mineralized mass of the phosphorites of Central Kyzylkum with the 70–90% solutions of ammonium nitrate at 110°C, are presented.     

Oxidation of brown coal of Angren deposit with a mixture of nitric and sulfuric acids

Oxidation of brown coal of Angren deposits by a mixture of nitric and sulfuric acids was studied in respect of dependence on the concentration of nitric acid (5–30%), concentration of sulfuric acid in nitric acid solution (2.5–20%), and temperature (40–80°C) at the process duration 2 h and the ratio of coal: HNO₃ = 1: 2. Optimal conditions of the process in terms of maximum yield of humic acids and the minimum loss of nitrogen oxides were found.     

Signal structure in diffuse refraction from the ionosphere

Conclusions Thus, our investigations with 10-sec resolution have shown that a diffuse signal usually consisted of several discrete pulses among which there is a well-defined peak pulse. The time extent of a diffuse pulse group was 40–80 sec for vertical sounding and 100–150 sec for oblique sounding. The most probable shift between adjacent pulses was 15–20 sec. For oblique sounding, and for vertical sounding at frequencies >0.8_c, individual diffuse-signal pulses fluctuated in amplitude and delay time. For vertical sounding at frequencies <0.8_c, the pulses fluctuated in amplitude and had stable time shifts over a 2-min observation run.For a vertical sounding, the effect prevailing among the four possible mechanisms considered for generation of diffuse reflections in the plane of the meridian at mid- and low latitudes is scattering by magnetically oriented inhomogeneities, while in the latitude plane it is the partial-reflection mechanism.The diffuse-signal structure for oblique sounding may be explained satisfactorily by the mechanism of forward scattering by discrete irregularities of a layer. In this case, the scattering and reception angles prove to be related in single-valued fashion to the group delay time for known average layer parameters. This makes it possible to determine the scattering indicatrix of an irregularity and the angular spectrum of the waves.Institute of Radio Engineering and Electronics, Academy of Sciences of the USSR. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 18, No. 9, pp. 1355–1364, September, 1975.     

The insoluble part of phosphorus fertilizers,obtained by processing of phosphorites of central kyzylkum with partially ammoniated extraction phosphoric acid

It is shown in the article that using ammophosphate treatment technology with poor in phosphorus highly carbonized ordinary phosphorite flour, washed dried concentrate, dust-like fraction, and mineralized phosphorite mass of Central Kyzylkum, it is possible to prepare concentrated phosphorus fertilizers of prolonged effect with the high content of assimilable form of P₂O₅.     

Mechanochemical activation of ordinary phosphorite powder of Central Kyzylkum mixed with urea nitrate and ammobium carbonate salts

Grinding of ordinary phosphorite powder of Central Kyzylkum with urea nitrate and ammonium carbonate salt to the particles size less than 0.16 mm is shown leading to significant increase in content of consumable by plants form of P₂O₅ in the products.