— 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 …

 — 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., ...

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 ...

 — 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 ...

 — 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 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 …

 — Phosphogypsum (PG) is a solid waste generated during the production of wet -process phosphoric acid.The silicon and phosphorus impurities in PG greatly affect its resource utilization.In this study, these impurities were removed at atmospheric pressure using a two-step gradient method that simultaneously converted the calcium sulfate …

 — 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 …

 — 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 ...

 — As phosphogypsum constitutes a large amount of solid waste material, its purification treatment and comprehensive utilization have close connection with economic development and ecological environmental protection. For the moment, the storage quantity of phosphogypsum is still rising as a result of the increasing phosphate fertilizer …

 — 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 conditions for two-step conversion of phosphogypsum to make K2SO4 are obtained from single factor experiment: The optimal experimental condition for the first …

 — 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 …

 — 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.

 — 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 …

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 ...

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...

 — 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 …

 — 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. …

 — 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 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), …

 — 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 ...

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 …

 — 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 …

 — 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.