Continuous and simultaneous conversion of phosphogypsum …
— 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. …
A study on the new production process for potassiam sulfate …
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 …
A Novel Process to Recover Gypsum from Phosphogypsum
— 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):
Process of preparing chloride-free KNS compound …
— 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).
Continuous and simultaneous conversion of phosphogypsum …
— 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.
Effective and innovative procedures to use phosphogypsum …
— 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 …
Properties, Purification, and Applications of Phosphogypsum…
— 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 …
Effects of phosphorus impurities on the preparation of α …
— Impurity is an important factor that determines the crystallization process of α-calcium sulfate hemihydrate (α-CSH), but the effects of phosphorus impurities in waste phosphogypsum on the α-CSH prepared using the salt …
Conversion of phosphogypsum to potassium sulfate and …
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 …
Staged purification of phosphogypsum using pH-dependent separation process
— 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 …
Green method of phosphogypsum waste conversion to lithium sulfate
DOI: 10.1016/j.scp.2022.100850 Corpus ID: 252702923; Green method of phosphogypsum waste conversion to lithium sulfate monohydrate and calcium hydroxide @article{Zdah2022GreenMO, title={Green method of phosphogypsum waste conversion to lithium sulfate monohydrate and calcium hydroxide}, author={Ilham Zdah and Aziz Azifa …
Continuous and simultaneous conversion of …
— This process aims to produce potassium sulfate (K2SO4), a high-value fertilizer, from sulfate solutions obtained after dissolving PG in a NaOH medium.
Preparation of gypsum with high purity and whiteness from …
— Phosphogypsum (PG) is a solid waste product generated during wet-process phosphoric acid production. Various impurities considerably reduce the purity, …
Utilization of phosphogypsum in CO2 mineral sequestration …
— 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 …
(PDF) Phosphogypsum Processing Method
— 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.
Process Flow Sheet of Potassium Sulfate Production.
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 ...
Green method of phosphogypsum waste conversion to lithium sulfate
— The novel process presented in this work is to propose an economic and ecological process of phosphogypsum (PG) conversion using soft chemistry. ... (OH) 2, CaF 2) and lithium, sodium or potassium sulfates (Li 2 SO 4, Na 2 SO 4, K 2 SO 4) ... Ammonium sulfate preparation from phosphogypsum waste. J. Radiat. Res. Appl. Sci., ...
Phosphogypsum: Properties and Potential Use in Agriculture
— Phosphogypsum (PG) is a calcium sulphate dihydrate and a by-product of the phosphate fertilizer industry. ... potassium sulphate, urea, sodium sulphate and calcium carbonate) (Ennaciri et al ... Kandil AHT, Cheira MF, Gado HS, Soliman MH, Akl HM (2017) Ammonium sulfate preparation from phosphogypsum waste. J Rad Res Appl Sci …
Production of Potassium Sulphate by Conversion of …
The direct conversion of phosphogypsum and KCl to produce potassium sulfate or syngenite (K2SO4‧CaSO4‧H2O) is of greatest practical interest. The conversion of …
Ammonium sulfate preparation from phosphogypsum waste
— The obtained precipitate is the highly purified phosphogypsum which is used to obtain the highly purified ammonium sulfate fertilizer, the preparation of ammonium sulfate process is applied using the suspended of 500 g purified phosphogypsum which is contained 410.6 g calcium sulfate in 2 L of 3% ammonium sulfate solution (as initiator), …
Sustainable Utilization of Phosphogypsum in …
— This study contributes to sustainable construction practices by exploring the use of phosphogypsum, a commonly discarded byproduct, in the production of recycled aggregates. Addressing both …
Continuous and simultaneous conversion of …
— 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.
Process of preparing chloride-free KNS compound …
— 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). It is well known that every year the phosphate industries produce a large quantity of PG around the world (i.e., Currently, global production of this waste is …
(PDF) Conversion of phosphogypsum to …
— 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 ...
Valorization of phosphogypsum in cement-based materials…
— 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 …
A Novel Process to Recover Gypsum from Phosphogypsum …
— 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 …
Continuous and simultaneous conversion of …
— 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.
Effect of maleic acid and pH on the preparation of α-calcium sulfate …
— 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 …
(PDF) Conversion of phosphogypsum to potassium sulfate and …
— 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.
Research of new process preparing potassium sulfate from …
— To improve the process of potassium sulphate prepared from phosphogypsum (under study, no product, only method) in ammonia solution, the …
Process Flow Sheet of Potassium Sulfate Production.
The process of potassium sulfate crystallization from aqueous solutions in the presence of organic modifiers containing phosphonic, phosphate, sulfonic, sulfate and carboxyl...
Research of new process preparing potassium sulfate from phosphogypsum
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. Meanwhile, the process of potassium …
Temperature effect on phosphogypsum conversion into potassium …
— Phosphogypsum (PG) waste causes several environmental problems. The present work proposes an attractive process to recycle this industrial waste via the wet conversion and contributes to solve this problem. In our previous work, we tried to convert the PG by KOH at ambient temperature, but its total conversion was limited at the …
Research on Two-step Conversion Process to Make …
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 …
Morphology‐Controlled Preparation of α‐Calcium Sulfate …
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, …