قائمة الطعام
This process aims to produce potassium sulfate (K 2 SO 4), a high-value fertilizer, from sulfate solutions obtained after dissolving PG in a NaOH medium.
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Sustainable process for the preparation of potassium sulfate by electrodialysis and its concentration and purification by a nanofiltration process. ... The production of potassium sulfate from phosphogypsum and potassium chloride in the presence of ammonia and isopropanol has been investigated. The solubility of phosphogypsum in aqueous ...
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The factors affecting the conversion of potassium chloride to potassium sulfate, such as aqueous ammonia to phosphogypsum ratio, weight percent of isopropanol in the solution, weight percent excess phosphogypsum, and reaction temperature and pressure have also been investigated.The optimum reaction conditions obtained at 25°C and atmospheric ...
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The present invention relates to a process for producing sodium sulphate from phosphogypsum, comprising: a step (101) of lixiviation of phosphogypsum by means of a basic solution so as to obtain a sodium sulphate solution (S) containing metal impurities, said basic solution comprising a chelating agent suitable for forming …
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Analytical grade glycerol (C 3 H 8 O 3), sodium sulfate (Na 2 SO 4) and citric acid (C 6 H 8 O 7 ·H 2 O) were purchased from Tianjin Zhiyuan Chemical Reagent Co., Ltd., China. PG was collected from a phosphate fertilizer plant in Guizhou Province, China. The X-ray diffraction (XRD) (X'Pert PRO, PANalytical Company, Netherlands) …
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The paper discusses process conditions of preparing potassium sulfate with phosphogypsum by one-step process.The best process factors are obtained by …
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The aim of this process is to produce potassium sulfate, a high-value fertilizer, from sulfate solutions obtained after dissolving …
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As both CaHPO 4 ·2H 2 O and CaSO 4 ·2H 2 O belong to monoclinic crystal system and possess comparable lattice constants, HPO 4 2− can easily replace part of SO 4 2− during the production of wet-process phosphoric acid and enter the calcium sulfate lattice, thus forming eutectic phosphorus. By comparing the FTIR spectra of PG raw …
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The main mineral phase of the raw phosphogypsum was characterized by X-ray diffraction analysis. As shown in Fig. 2 b, the XRD results confirmed that the mainly composed of phosphogypsum is calcium sulfate CaSO 4 ·2H 2 O The major peaks of CaSO 4 was identified at 11.71°, 20.80°, 23.44° and 29.16°, while some minor peaks …
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Phosphogypsum. Phosphogypsum is the primary waste byproduct of the wet-acid process for producing phosphoric acid. During this process sulfuric acid dissolves phosphate rock creating a solid/liquid mixture (slurry) of phosphoric acid and calcium sulfate (phosphogypsum).
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The valorization of co-products in different fields is an interesting way to minimize many serious problems for ecosystems and human health. The novel process presented in this work is to propose an economic and ecological process of phosphogypsum (PG) conversion using soft chemistry.It makes possible to recover …
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Phosphogypsum (PG) is an industrial byproduct primarily composed of calcium sulfate dihydrate (DH, CaSO 4 ·2H 2 O), generated from the wet process production of phosphoric acid. Currently, the ...
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process of producing sulfuric acid and lime based on phosphogypsum was proposed, in which thephosphogypsum was calcined below 1200 °C directly without adding other raw materials. This reduced the content of Si, Al, Na, F, Cl, and other elements so that the lowest eutectic point of the raw materials was >1200 °C.26 The process of preparing
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Section snippets Materials. Analytical grade glycerol (C 3 H 8 O 3), sodium sulfate (Na 2 SO 4) and citric acid (C 6 H 8 O 7 ·H 2 O) were purchased from Tianjin Zhiyuan Chemical Reagent Co., Ltd., China. PG was collected from a phosphate fertilizer plant in Guizhou Province, China. The X-ray diffraction (XRD) (X'Pert PRO, PANalytical …
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A substantial stockpile of phosphogypsum (PG) not just consumes land resources, but also poses environmental contamination risks. Herein, the conversion of PG into high-value α-hemihydrate gypsum (α-HH) whisker by the atmospheric pressure salt solution method with simple process, high efficiency and low energy consumption was …
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Process of preparing chloride-free KNS compound fertilizers from phosphogypsum waste using a quaternary phase diagram. ... Conversion of phosphogypsum to potassium sulfate and calcium carbonate in aqueous solution. MATEC Web Conf., 5 (2013), p. 04006. CrossRef View in Scopus Google Scholar.
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Phosphogypsum (PG) is a by-product of the wet-process phosphoric acid process, which causes serious environmental issues. In this work, PG was taken as raw material to prepare α-calcium sulfate ...
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The objective of this work is to present a simple process permitting to produce K 2 SO 4 via the wet conversion of phosphogypsum (PG) waste generated …
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The process conditions for two-step conversion of phosphogypsum to make K2SO4 are obtained from single factor experiment: The optimal experimental condition for the first …
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The process comprises four basic units: preparation of the ore and flotation, production of ite and its recovery, leaching of the ... In this production process, potassium sulfate is ...
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The process of potassium sulfate crystallization from aqueous solutions in the presence of organic modifiers containing phosphonic, phosphate, sulfonic, sulfate and carboxyl functional groups has ...
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Abstract The possibility of obtaining potassium sulfate by converting calcium sulfate (phosphogypsum) and potassium chloride in an ammonia solution was investigated. The optimal conditions for the process at various concentrations of ammonia solution were determined. When using a 25% solution of NH3, the stirring time is 30–60 …
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Phosphogypsum (PG) is a by-product produced during the wet process of phosphoric acid (H3PO4) production from natural phosphate rocks. Approximately 4–6 tons of PG is produced per ton of phosphoric acid production, where worldwide PG generation exceeds 300 million tons annually. The vast majority of produced PG is discarded …
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To improve the process of potassium sulphate prepared from phosphogypsum (under study, no product, only method) in ammonia solution, the influence of solvent such as Methanol, Methanol-ammonia on the yield of potassium oxide was studied. The result revealed that the system of ethanol and ammonia was optimal. …
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DOI: 10.1016/j.psep.2023.07.037 Corpus ID: 260042788; Process of preparing chloride-free KNS compound fertilizers from phophogypsum waste using a quaternary phase diagram @article{Bouargane2023ProcessOP, title={Process of preparing chloride-free KNS compound fertilizers from phophogypsum waste using a quaternary phase …
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This paper describes a novel hydrothermal method for preparing potassium sulfate and zeolite NaA from K-feldspar ore. The 3-step process involves the hydrothermal decomposition of K-feldspar, the ...
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1. process for preparing potassium sulfate with more by-products, with phosphogypsum and Repone K is raw material, with the solution that contains ammonia at least is liquid-phase catalyst, it is characterized in that phosphogypsum and Repone K soak that to be dissolved in ammonia concentration be in 25～36% the catalyst solution, …
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Phosphogypsum (PG) waste is a by-product generated from wet-process phosphoric acid (H 3 PO 4) manufacturing during phosphate rock decomposition.Worldwide, the annual production of PG ranges between 100 and 300 million tons, with only a few quantities utilized in several application domains (about 15%), the …
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Ammonium and potassium sulfate In the hemihydrate or dehydrate state, it is used aiming to recover the SO 4 content in manufacturing of ammonium or potassium sulfate by the double de-composition ...
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