Request PDF | Sulfate reduction from phosphogypsum using a mixed culture of sulfate-reducing bacteria | Phosphogypsum (CaSO4), a primary by-product of phosphoric acid production, is accumulated in ...

The effect of temperature on phosphogypsum conversion was evidenced reacting a high concentration of phosphogypsum waste (1.3 M) with potassium hydroxide to produce portlandite Ca(OH) 2 and potassium sulfate K 2 SO 4. At 80 °C, the conversion is complete since we were able to avoid the formation of syngenite phase which blocked …

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 ...

This work shows the possibility of obtaining potassium sulfate by converting phosphogypsum and potassium carbotane by the reaction CaSO 4 + K 2 CO 3 → ↓ CaCO 3 + K 2 SO 4 . The optimal conditions for this process are determined.

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 calcium sulphate dihydrate and a by-product of the phosphate fertilizer industry. It is produced in huge quantities (300 MT/year), but only 15% of the PG produced is recycled.

Phosphogypsum, as a byproduct of wet-process phosphoric acid reaction, has caused many environmental pollution problems. To improve the property and purity of phosphogypsum in the wet-process phosphoric …

Phosphogypsum–a byproduct of phosphoric acid production–piled near eco-sensitive regions, poses both environmental and health risks. ... the transformation of the Moroccan phosphogypsum (PG) waste, considered a potential source of sulfate, into potassium sulfate compound could help reduce environmental impact and …

K 2 SO 4 has been studied at 25 • C and 0.0 bar gauge using a 33 wt.% ammonia solution (with Fig. 7. Effect of ammonia solution to phosphogypsum ratio on the production of potassium sulfate at ...

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 …

DOI: 10.1016/j.mset.2020.06.005 Corpus ID: 226712155; Utilization of phosphogypsum in CO2 mineral sequestration by producing potassium sulphate and calcium carbonate @article{Lachehab2020UtilizationOP, title={Utilization of phosphogypsum in CO2 mineral sequestration by producing potassium sulphate and calcium carbonate}, author={Adil …

the production of potassium sulfate from phosphogypsum and other matter such as sylvinite, KCl and potassium ... was achieved by using calcium sulfate isolated from sea salt production . J. Mater ...

Effect of ammonium sulfate and phosphogypsum application on nutrients dynamics and acidity of black soil. Effect of ammonium sulfate and phosphogypsum application on nutrients dynamics and acidity of black soil. Elina Zakharchenko. 2020, Vìsnik Sumsʹkogo nacìonalʹnogo agrarnogo unìversitetu.

The effect of temperature on phosphogypsum conversion was evidenced reacting a high concentration of phosphogypsum waste (1.3 M) with potassium …

Phosphogypsum (PG) is a calcium sulphate dihydrate and a by-product of the phosphate fertilizer industry. It is produced in huge quantities (300 MT/year), but only 15% of the …

Introduction. Phosphogypsum (PG) is a waste material generated during production of phosphoric acid (H 3 PO 4) from phosphate rock rich in apatite [Ca 5 (PO 4) 3 OH] via reaction with …

The manufacturing of fertilizers (ammonium sulphate, potassium sulphate, urea, sodium sulphate and calcium carbonate) (Ennaciri et al. 2016; IFA 2018). • Composting: PG is widely used as a ...

Section snippets The Phosphogypsum process. Potassium sulfate can be produced by the double decomposition reaction of potassium chloride and phosphogypsum in aqueous ammonia solution at low temperatures. 2 KCl + CaSO 4 ·2 H 2 O → K 2 SO 4 + CaCl 2 +2 H 2 O The presence of ammonia prevents the formation of …

The research progress of comprehensive utilization of phosphogypsum is introduced, including the production of sulfuric acid, calcium sulfate whiskers, potassium sulfate, ammonium sulfate, paper filler and coating pigment, building materials and products, nano-hydroxyapatite, as soil amendments, fertilizer, subgrade material, filling material ...

It is also possible to produce potassium sulfate by double decomposition of potassium chloride and phosphogypsum in aqueous ammonia solution at room temperature. The reaction is proposed by Fernandez and al [9]: CaSO 4,2H 2O + 2KCl→ K 2SO 4 + CaCl 2 + 2H 2O. In 1999, Abu-Eishah and al [10], prepared K 2SO 4 from the phosphogypsum …

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 …

Phosphogypsum (PG) is a solid waste product generated during wet-process phosphoric acid production. Various impurities considerably reduce the purity, whiteness, and application range of PG. This ...

Phosphogypsum (PG) is a solid waste product generated during wet-process phosphoric acid production. Various impurities considerably reduce the purity, …

– The reaction is made mole per mole between the phosphogypsum and the carbonate of potassium. – The phosphogypsum is wet. – The optimal limit concentration is 0.6 mol/l. – The time of the reaction is-1 hour and 30 min. Figure 3. Diffractograms of the filtrates obtained for the concentration 0.3 mol/l at different times. Table 1.

Abstract Phosphogypsum (PG) is a calcium sulphate dihydrate and a by-product ... (ammonium sulphate, potassium sulphate, urea, sodium sulphate and calcium carbonate) (Ennaciri et al. 2016;IFA 2018). ... the production cost in the dry process is much higher. However, the acid

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 ...

Potassium Sulfate in Mixed Solvents Sebastian Gutmann,Jürgen Gmehling,Xiaohua Lu,2007 ... the potential of phosphogypsum in the manufacture of fertilizer grade potassium sulfate with calcium chloride as a byproduct The ... impact associated with book production and transportation. Furthermore, Solubility Of Potassium Sulfate books …

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 …

For every ton of phosphoric acid produced, about 5 tons of phosphogypsum are generated, de-pending on the quality of the phosphate ore: 3H2SO4(l)+Ca3(PO4)2(s)+6H2O(l) …

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).