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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sulfur dioxide gas generated by the thermal decomposition of gypsum to commercially acceptable sulfuric acid, the leaching agent wet process acid producers …
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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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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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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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The attack of nitric acid upon phosphate rock to produce soluble phosphate is represented by equation 1. 20HNO 3 + Cal0(PO4)6F2---~ 6H3PO 4 + 10Ca(NO3) 2 + 2HF (1) The chemistry is seen to be similar to that ob- tained when sulfuric acid is employed, except that the by-product phosphogypsum is replaced
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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 "wet process", in which phosphate rock and sulfuric acid react, is the most common method for producing phosphoric acid (PA) ... that more than 90 % of rare earth elements would dissolve in the leaching solution using hydrochloric or nitric acid for the decomposition of phosphate rocks (Amine et al., 2019; Habashi, ...
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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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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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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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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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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 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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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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They were produced by reacting sulphuric acid with phosphate rock (Tunisia) in the DH-process. ... As the moisture content of the acidulated rock charged to the autoclave is increased, the decomposition of mono-calcium phosphate to di- calcium phosphate and phosphoric acid becomes less pronounced. In this work when the moisture content of the ...
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A typical process is described as follows: Calculated quantities of concentrated sulfuric acid (60° to 66° B.) diluted with weak phosphoric acid and a recirculated slurry of partly decomposed phosphate rock are fed continuously to one or more agitator tanks, then discharged into the first of a series of mixing tanks to which weighed ...
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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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Strontium phosphate reacts with sulfuric acid, H2SO4, to form strontium sulfate and phosphoric acid, H3PO4. A) Write a balanced equation for the reaction. B) If 6.45 g of strontium phosphate and 5.50 g of sulfuric acid are used and 5.68 g of strontium sul
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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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were carried out in the range of sulfuric acid concentration of 56-64 % and the norm of 80-100 % of stoichiometry. The stoichiometric rate of sulfuric acid for the decomposition of phosphate raw materials to dihydrogen phosphate-calcium was calculated taking into account the content of P2O5, CaO, and CO2 in it.
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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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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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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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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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(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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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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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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It has been recognized that the nitric acid decomposition of phosphate rock for the production of phosphoric acid is generally feasible and desirable., which has a promising future. Because of the limitations of HF generation efficiency, a significant amount of SiO 2 in phosphate rock products is still filtered and separated as nitric acid ...
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