Effect of carbamide on sulfuric acid decomposition of phosphate raw materials in nonthickening suspensions in production of integrated fertilizers

Dormeshkin, O. B.; Vorob'ev, N. I.; Cherches, G. Kh.; Gavrilyuk, A. N.

doi:10.1134/s1070427208020067

Cited by 2 publications

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“…While using as the generalized criterion distance to utopian point [13][14] н (9) where On values of the generalized function d coefficients of the regression equation (4, 5) have been counted, the significance of coefficients has been checked up by Student's criterion according to equation ( 6), adequacy of the regression equation to experiment has been checked up by Fisher's criterion (7).…”

Section: Optimization By Utopian Point Methodsmentioning

confidence: 99%

“…Regression equations coefficients have been revealed (Table 3) The value of regression equation coefficients has been estimated by Student criterion by the formula (7). Adequacy of the equation of regression to experiment [13][14]…”

Section: The Orthogonal Planmentioning

confidence: 99%

“…One of main types of the fertilizers widely applied in agro-industrial complex are phosphorus containing mineral fertilizers obtained by acidextraction processing of natural phosphatesapatites and phosphorites [1][2]. As scientific publications testify [3][4][5][6][7][8] acid methods differ by number of potential possibilities.…”

Section: Introductionmentioning

confidence: 99%

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Optimization of Decomposition Process of Karatau Phosphorites

et al. 2012

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Phosphorous-acid process of Karatau phosphorites’ decomposition has been studied. The impact of temperature, time and acid rate on decomposition process of phosphate raw material, the conditions ensuring maximum degree of phosphorite decomposition have been identified. Variance estimate of experiment results’ reproducibility has been carried out by mathematical statistics method; the coefficients of regression equations have been set. The significance of regression equation coefficients has been checked up by Student’s criterion, and the adequacy of regression equation to experiment has been checked up by Fisher's criterion. With the use of utopian point method the parameters of studied raw materials’ decomposition have been optimized.

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Section: Optimization By Utopian Point Methodsmentioning

confidence: 99%

Section: The Orthogonal Planmentioning

confidence: 99%

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Optimization of Decomposition Process of Karatau Phosphorites

et al. 2012

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“…It is often possible to find struvite in the composition of deposits on pipes diverting wastewater from livestock complexes [4]. There are many studies devoted to the methods of obtaining MAP [5,6,7,8]. Methods of obtaining MAP from agro-industrial wastewater have been developed.…”

Section: Introductionmentioning

confidence: 99%

Obtaining a complex mineral fertilizer from raw materials of varying degrees of purification from impurities

Bagnavets,

Grigoryeva

2024

BIO Web Conf.

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The article is devoted to the synthesis of a complex fertilizer magnesium-ammonium phosphate (MAP) from raw materials of varying degrees of purification, the effect of certain impurities on the MAP yield, as well as the choice of optimal conditions for obtaining this fertilizer. Phosphorus, as is known, is an irreplaceable element of plant nutrition, therefore the introduction of compounds containing phosphorus in one form or another is necessary for the normal development of plants during the growing season. Phosphoric acid, obtained by opening natural phosphates with mineral acids, in particular, sulfuric acid, is often used to obtain phosphoric fertilizers. One of the ways to purify the phosphoric acid obtained in this case is purification using various organic solvents. At the output, phosphoric acid is purified from most impurities, containing a small amount of impurity cations and anions, the main of which are fluorides and sulfates. We carried out the MAP synthesis on the basis of chemically pure phosphoric acid and using an acid purified with an organic solvent tributyl phosphate. It has been shown that the presence of sulfates and fluorides in purified phosphoric acid increases the MAP solubility in an aqueous solution by increasing the ionic strength of the solution and leads to a slight decrease in the yield of the synthesis product from 81% to 78%. The interfering effect of impurity anions can be reduced by conducting the process in an alkaline medium, pH 9-10, with the addition of an excess relative to the stoichiometric amount of an aqueous ammonia solution.

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Effect of carbamide on sulfuric acid decomposition of phosphate raw materials in nonthickening suspensions in production of integrated fertilizers

Cited by 2 publications

References 0 publications

Optimization of Decomposition Process of Karatau Phosphorites

Optimization of Decomposition Process of Karatau Phosphorites

Obtaining a complex mineral fertilizer from raw materials of varying degrees of purification from impurities

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