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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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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The solid–solid reaction between CaSO 4 and CaS is an important step in PG decomposition to sulfuric acid cogeneration cement technology, 35,36 achieving the maximum recovery of CaO …
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Single superphosphate (9% P) is manufactured by reacting ground rock phosphate with sulfuric acid while double (16% P) and triple (19% P) superphosphate are produced by reacting ground rock phosphate with phosphoric acid. Where N and P additions are required, monoammonium phosphate (MAP) and diammonium phosphate (DAP) are often used.
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Recovery of P and REE from phosphate rock by leaching with sulphuric acid, hydrochloric acid and nitric acid has been studied, Wang 2010, Shlewit 2011, Jorjani 2011, Sandström 2012. For the ...
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In the wet processes, phosphoric acid is produced by reacting sulfuric acid with phosphate rock. It should be mentioned that this reaction takes place in the presence of an excessively large amount of H 3 PO 4.When a sufficient degree of crystallization of gypsum is achieved, the crystals are separated by filtration.
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The reaction between phosphate rock and sulphuric acid is self-limiting. because an insoluble layer of calcium sulphate forms on the surface of the. ... thus causing the decomposition of fluosilicic.
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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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It was found that the use of sulfuric acid with a concentration of 75 and 80% leads to an increase in the moisture content in the composition of the complex fertilizer. The main components of a complex fertilizer obtained by nitric-sulfuric acid decomposition of unfortified phosphate rock
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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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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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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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Wang et al. [34] used hydrochloric acid decomposition of phosphate ore, lime milk neutralization, and oxalic acid precipitation in a two-step process, obtaining a total rare earth yield of 70–79 %. In order to avoid the adulteration of impurity elements, Xie et al. [43] used liquid membrane separation technology to separate REEs from 90 % of ...
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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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The decomposition coefficient of phosphate rock by 93% sulfuric acid depending on the interaction time Phosphorus reserves of the Kyzylkum deposit Figures - available via license: Creative Commons ...
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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 phosphoric acid alone.
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This is attributed to the fact that even though the actual phosphate rock used does not completely absorb SO 2, the total amount of SO 2 in the liquid phase continues to increase with increasing SO 2 concentration and is then oxidized to produce SO 4 2-. Sulfuric acid, in turn, reacts with phosphate to produce more phosphoric acid.
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However, phosphate rocks decomposition by sulfuric acid remains the most widely used method (Sinirkaya et al., 2014; IMPHOS, 2004) and over 90% phosphoric acid produced worldwide is manufactured by digestion of phosphate rocks with sulfuric acid (Calmanovici et al., 1997).
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The methods for producing simple superphosphate by two-stage sulfuric acid decomposition of natural phosphates are analyzed. For the first stage, the process of decomposition of high-carbonate ...
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Although this is the first time that REEs are leached from Abu Tartur phosphate rock with phosphoric acid, the idea of directly leaching REEs from a raw material as a preprocessing step is not new ...
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Download scientific diagram | The decomposition coefficient of phosphate rock by 93% sulfuric acid depending on the interaction time from publication: IOP Conference Series: Earth and ...
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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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Download scientific diagram | The decomposition coefficient of phosphate rock by 93% sulfuric acid depending on the interaction time from publication: Simple superphosphate by two-stage acid...
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(14) are not in good agreement of the experimental results for a leaching phosphate rock into sulfuric acid. The gap is substantial for the high reaction time (Fig. 6). The reason of this is that the formation of the solid (gypsum) can clog …
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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 …
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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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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 the degree of suspension of mineral particles as well as the leaching rate increased about 10% under the ...
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Download Citation | Decomposition of phosphate rock with mixed sulfuric acid and potassium bisulfate | In order to explore a producing method of agricultural potassium dihydrogen phosphate with ...
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Answer to Phosphoric acid can be prepared by reaction of. Science; Chemistry; Chemistry questions and answers; Phosphoric acid can be prepared by reaction of sulfuric acid with "phosphate rock" according to the equation: Ca3(PO4)2 + 3H2SO4 → 3CaSO4 + 2H3PO4 Suppose the reaction is carried out starting with 133 g of Ca3(PO4)2 and 93.0 g of H2SO4.
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