— 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. …
— 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 ...
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 ...
Phosphogypsum (PG), a by‐product of phosphoric acid industry, causes environmental issues. In this paper, PG was effectively transformed into alpha‐calcium sulfate hemihydrate (ɑ‐CSH) via a semi‐liquid method. The phase evolution and the effects of different organic acids and pH values on crystal morphology of the α‐CSH were investigated by SEM, …
— To improve the process of potassium sulphate prepared from phosphogypsum (under study, no product, only method) in ammonia solution, the …
— 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 hemihydrate (α-CSH) at atmospheric pressure using Mg(NO3)2 solution, which is an environmentally friendly chlorine-free salt solution. The …
— The work by Zemni et al. [44] provides a study on the generation of calcium silicate and sodium sulphate, through the chemical reactions between phosphogypsum and sodium silicate.The results showed that the solid produced during the reaction can sequester CO 2.Rashad [17] assessed the effect of PG on properties such as …
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 diagram}, …
— 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 …
— DOI: 10.1016/j.jrras.2016.11.001 Corpus ID: 99459389; Ammonium sulfate preparation from phosphogypsum waste @article{Kandil2017AmmoniumSP, title={Ammonium sulfate preparation from phosphogypsum waste}, author={Abdelhakim Kandil and Mohamed F. Cheira and Hady Soliman Gado and Madiha H. Soliman and …
— 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 was …
— The obtained results show the high efficiency of portlandite Ca(OH)2 resulting from the dispersion of phosphogypsum in alkaline potash solution followed by releasing of potassium sulphate as a co ...
— Phosphogypsum (PG) is an industrial by-product of the transformation of phosphate rocks. For decades, PG has been a source of environmental concern due to the massive amount produced thus far, i.e., 7 billion tons, with a current production rate of 200–280 million tons per year. Phosphate minerals contain various impurities that …
— Phosphogypsum (PG) waste is a by-product generated from wet-process phosphoric acid (H3PO4) 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 unused PG is usually …
— In this present work, the transformation of the Moroccan phosphogypsum (PG) waste, considered a potential source of sulfate, into potassium sulfate compound could help reduce environmental impact and create a new value chain for the phosphate industry. Generally, solid–liquid equilibria are frequently applied in chemical industries.
— In this study, we investigated a coarse phosphogypsum containing 49.63% SO3, 41.41% CaO, 10.68%, 4.47% SiO2, 1.28% P2O5, 0.11% F, CaSO4·2H2O purity of 80.65%, and whiteness of 27.68. Phosphogypsum contains calcium sulfate dehydrate as the main mineral, with small amounts of brushite, quartz, muscovite, and zoisite. Harmful …
— The aim of this process is to produce potassium sulfate, a high-value fertilizer, from sulfate solutions obtained after dissolving Moroccan phosphogypsum in NaOH medium.
— After calibration, the samples were tested. The purity of the calcium sulfate dihydrate in the phosphogypsum was determined by the content of crystallized water in the gypsum. The mass fraction of calcium sulfate dihydrate (G) in the sample was calculated using Equation (1). Gypsum recovery was calculated using Equation (2):
The process of potassium sulfate crystallization from aqueous solutions in the presence of organic modifiers containing phosphonic, phosphate, sulfonic, sulfate and carboxyl...
The direct conversion of phosphogypsum and KCl to produce potassium sulfate or syngenite (K2SO4‧CaSO4‧H2O) is of greatest practical interest. The conversion of …
— 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, carry …
— The aim of this process is to produce potassium sulfate, a high-value fertilizer, from sulfate solutions obtained after dissolving Moroccan phosphogypsum in NaOH medium.
Decomposition of phosphogypsum by potassium carbonate in aqueous solution Based on the previous works relative to the decomposition of the phosphogypsum by liquid route, we combined the reaction of preparing K2 SO4 from the phosphogypsum and KCl and the reaction of preparing (NH4 )2 SO4 from the phosphogypsum, the carbon dioxide and the …
A new preparing process for K 2SO 4 from (NH 4) 2SO 4 was developed. The effects of the raw material mole ratio, reaction temperature,crystal temperature, time and crystal improver on the comversion of the raw material and the compoisition of products were studied through orthogonal experiment and individual experiments. Meanwhile, the optimal …
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 ...
— Phosphogypsum (PG), commonly known as calcium sulfate, is a waste by-product generated during the production of phosphoric acid by the wet phosphoric acid process (WPA).
— The aim of this process is to produce potassium sulfate, a high-value fertilizer, from sulfate solutions obtained after dissolving Moroccan phosphogypsum in NaOH medium.
— In this present work, the transformation of the Moroccan phosphogypsum (PG) waste, considered a potential source of sulfate, into potassium sulfate compound could help reduce environmental impact and create a new value chain for the phosphate industry. Generally, solid–liquid equilibria are frequently applied in chemical industries. …
