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Mathematical modeling of the dissolution of phosphate rock into …
(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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(PDF) Flow of simple superphosphate using two-stage decomposition …
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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Advances in Phosphogypsum Calcination and Decomposition …
The process employs electric heating, resulting in high energy and electricity consumption. 7 (2) The sulfuric acid method, 1 in which phosphoric acid is extracted by decomposing phosphate rock with sulfuric acid, is more widely known as the wet process for producing phosphoric acid. 3,8,9 The most prominent feature of this method is that ...
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Phosphate Rock Properties
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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The decomposition coefficient of phosphate rock by …
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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Recovery of Rare Earth Elements from Phosphate Rock by
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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Treatment of phosphate rocks with hydrochloric acid
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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Effect of phosphate rock quality on the efficiency of …
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 …
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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DEVELOPMENT OF TECHNOLOGY FOR PRODUCING NP …
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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Enhanced absorption of SO2 from phosphogypsum decomposition …
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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Sustainable Approach for Recovery of Sulfur from Phophogypsum
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 PRODUCTION OF DI-CALCIUM PHOSPHATE FTY TEE DIRECT ACIDULATION …
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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Dissolution of Djebel Onk phosphate ore using sulfuric acid
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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Sustainable Approach for Recovery of Sulfur from Phophogypsum
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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Leaching kinetics for magnesium extraction from phosphate rock …
In 2010, Zhang (Zhang et al., 2010) on the background of magnesium removing from the Sichuan Mabian phosphate ore by sulfuric acid, the kinetic models for magnesium and phosphorus removals from ore are set up. ... the study of the kinetic models for the decomposition of phosphate rock are gradually mature (Bhuiyan et al., 2009, Zhang et al., ...
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Rigid-Flexible Combined Impeller Enhancement in Leaching …
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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Advances in Phosphogypsum Calcination and Decomposition …
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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Enhanced absorption of SO2 from phosphogypsum …
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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Waste Treatment and Resource Utilization: Removal and …
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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Dissolution of Djebel Onk phosphate ore using sulfuric acid
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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Phosphoric acid can be prepared by the reaction of sulfuric acid …
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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Fluosilicic Acid: Recovery System and Aluminum Fluoride production
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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EVALUATION OF POTENTIAL COMMERCIAL …
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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Quality of Phosphate Rocks from Various Deposits Used in Wet …
The accuracy and precision of the used methods were evaluated by analysis of standard reference materials (SRM) for Western Phosphate Rock (NIST 694). The recovery was 85.3% for U and 109% for K 2 O, and the RSD ranged from 0.67% to 12.8%. Keywords: phosphate rock, wet phosphoric acid, phosphate fertilizers, elemental analysis. 1. Introduction
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A novel process for the separation and recovery of phosphorus …
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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On the Modelling of Phosphate Rock Acidulation Process
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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Review Recovery of rare earth elements from phosphate rock by
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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Decomposition of phosphate rock with mixed sulfuric acid and …
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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Technological aptitude of some Brazilian phosphate rocks for acid
Fundamentals of the Wet-Process Phosphoric Acid Production. 2. Kinetics and Mechanism of CaSO4·0.5H2O Surface Crystallization and Coating Formation. ... Kinetics and Mechanism of the Phosphate Rock Dissolution. Industrial & Engineering Chemistry Research 1996, 35 ... Dissolution of Djebel Onk phosphate ore using sulfuric acid. Environmental ...
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