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In this study a method for obtaining granular NPK fertilizers of various grades has been established. Kola apatite or Baltic phosphorites were dissolved in 57% H2SO4; the resulting slurries were then ammoniated, evaporated and mixed with urea or ammonium nitrate and potassium salts. In some experiments micronutrients (B, Cu, Mo, Co or Mn) were added. The …
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Phosphogypsum (PG) is a solid waste produced from decomposition of phosphate rock in sulfuric acid. It can improve the physicochemical properties of soil. However, the application of PG will inevitably change the living environment of soil microorganisms and lead to the evolution of the soil microbi …
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OCP, the state-owned Moroccan phosphate rock mining company and phosphoric acid manufacturer, wants to stop the practice of seawater phosphogypsum disposal in the near future [9] and is actively ...
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The solid-liquid reaction between Udaipur rock phosphate and different concentrations of sulphuric acid is found to be greatly enhanced when the reaction is carried out in the presence of high intensity ultrasound (800 kHz and 80 W cm −2).Even coarser rock particles up to 50 mesh (BSS) can be effectively decomposed in the presence of ultrasound to …
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The primary sulfuric acid extraction process of phosphate rocks results in the accumulation of phosphogypsum. ... The temperature rises because of the exothermic nature of the reaction and ing takes place due to the decomposition of carbonates. ... A farther advantage of using diluted acid for leaching phosphate rock is the formation of ...
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Semantic Scholar extracted view of "Kinetics of the sulfuric acid decomposition of apatite" by V. Beskov et al. ... This paper is devoted to the fundamentals of natural phosphate rock dissolution under conditions close to those in the industry of the wet-process phosphoric acid production. The dissolution kinetics … Expand. 45.
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The lower grade is usually manufactured by decomposing phosphate rock with a mixture of sulfuric and phosphoric acids; the higher grade (also called triple superphosphate) is produced by treating the rock with …
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incomplete decomposition of the phosphate material by the sulfuric acid and another part – as a result of the co-precipitation (co-crystallization) of P 2 O 5 with CaSO 4 .
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Phosphate rock and sulfuric acid are the two major raw materials for manufacture of phosphate fertilizers. Nearly all commercial phosphate fertilizers are derived from phosphate rock; the …
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Phosphate rock must be finely ground to react properly with sul- furic acid, and standard control equipment is normally used to prevent objectionable dust emissions.
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Phosphogypsum is a discarded byproduct from the processing of phosphate rock in plants producing phosphoric acid and phosphate fertilizers, such as superphosphate. The wet chemical phosphoric acid treatment process, or "wet process," in which the phosphate ore is digested with sulfuric acid, is widely used to produce phosphoric acid and ...
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In this experimental investigation, the factors that might affect the decomposition by sulfuric acid of two phosphate rocks have been studied. The samples were taken from the …
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At the first stage, the phosphorite is treated with a stoichiometric flow rate of concentrated sulphuric acid (at least 93%), under conditions of complete deco...
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Phosphate rock has been considered as one of the most significant secondary rare-earth resource, and the utilization of rare earth elements (REEs) in phosphate rock has attracted increasing attention. In this study, the …
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Kheli [3] also described the occurance of phosphate rock at Hazara. Ishaq [4] undertook studies on the utilization of this rock. Khattak, et.al. [5] presented a monograph on the exploration, beneficiation and utilization of Hazara rock phosphate. The decomposition of Jordan and Lagarhen phosphate rock with Nitric, Hydrochloric and Sulphuric acids
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materials from 11.7% to 3%, with subsequent sulfuric acid decomposition of phosphorites, the size of phosphogypsum crystals increases from 50 to 250 microns. 3. For the first time, it was shown that the temperature dependence of the rate of ... kinetics of decomposition processes of phosphate rock, apatite and their mixture showed that the
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Phosphoric acid is made by adding sulfuric acid to phosphate rock. (a) The rate of reaction between sulfuric acid and phosphate rock can be increased if the mixture is heated to a higher …
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Various studies showed that the decomposition of phosphate ... phosphate rock in sulfuric acid solutions have been examined. A mathematical model including the effects of ...
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The wet process using sulfuric acid is the most common method for producing fertilizer-grade phosphoric acid on an industrial scale, with the phosphate rock and sulfuric acid reacting at high temperatures and pressures to extract over 98% of the phosphoric acid.
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During the classical production of phosphoric acid, the reaction between sulfuric acid and phosphate rock generates suspension. The latter is subsequently filtered and concentrated by evaporation process resulting in fluorine or acid gas. ... The loss of cooling capacity increases the risk of phosphogypsum and chukrovite decomposition and also ...
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The reaction between apatite and sulfuric acid, which produces soluble phosphoric acid and insoluble phosphogypsum, is the main reaction taking place in a phosphoric acid plant. Nevertheless, there are side reactions' involving some desirable and undesirable impurities. The present paper aimed to study and evaluate the performances and behavior of four grades of …
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The carbonates in the phosphate rocks consume an additional acidulent (sulphuric acid) during the production of phosphoric acid and super phosphates. During the reaction, carbon dioxide produced causes more ing and also results in production of smaller size gypsum crystals, that may blind the downstream phosphogypsum filters, and a low ...
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Phosphogypsum (PG) is a major industrial by-product of wet process phosphoric acid production, and untreated PG stockpiled on land will cause severe environmental pollution. Thermal treatment of PG is currently the mainstream treatment method PG can be thermally decomposed to produce CaO, and the decomposition process produces large amounts of SO …
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In 1965, researchers from Romania decomposed phosphate rock with HCl, precipitated REEs from chloride-phosphate by precipitation with lime milk, and produced REO concentrate with a purity about 87.9% by further treatments including acid redissolution, oxalic acid precipitation, and calcination [60], [61]. However, due to the relative low ...
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leaching and resource utilization of phosphate rock attracts extensive attention. Efficient leaching of phosphate rock has been widely studied over the past few decades.9 Guo et al.10 studied ultrasound-enhanced decomposition of phosphate rock in a sulfuric acid medium and found that ultrasonic vibrations could improve
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Based on the decomposition processes of phosphate rock by H2SO4, HNO3, HCl, H3PO4, various REEs recovery processes via crystallization, precipitation, solvent extraction and ion exchange methods ...
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In this paper, phosphate slurry was used to absorb SO 2 generated during the PG decomposition to produce phosphoric acid. The effects of operating conditions such as …
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The inventor is in the patent number ZL94111776.6 (patent name: a sulfuric acid method to produce phosphorus The method of acid and phosphorus-containing solution) successfully applied the principle that carbonate and calcium phosphate in phosphate rock react with sulfuric acid and phosphoric acid in wet-process phosphoric acid, and solved the ...
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by digesting phosphate rock with sulphuric acid is being used directly. According to some earlier studies [11, 12], by using sulphuric acid concen- tration of about 57% and a greater acidulation ratio than for producing single superphosphate, it is possible to obtain from apatite or phosphor-
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DOI: 10.1007/BF00750564 Corpus ID: 24006977; Obtaining NPK fertilizers using decomposition of phosphate rock by sulphuric acid @article{Aasame2004ObtainingNF, title={Obtaining NPK fertilizers using decomposition of phosphate rock by sulphuric acid}, author={E. Aasam{"a}e and Julia Kudryavtseva and Marve Einard}, journal={Fertilizer research}, year={2004}, …
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