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 ...

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 this conversion ...

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 ...

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 ...

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 solutions of KCl, HCl, and mixtures of both has been first measured at various temperatures and concentrations.

The possibility of obtaining potassium sulfate by converting calcium sulfate (phosphogypsum) and potassium chloride in an ammonia solution was investigated. The …

Production of potassium sulfate from KCl and phosphogypsum (no ammonia, no alcohol for Runs No. 1 and 2), and (33% ammonia, no alcohol, and 4.32:1 ammonia solution to phosphogypsum ratio for Runs ...

PRODUCTION OF POTASSIUM SULPHATE 347 In order to intensify this process, it was also proposed to carry out the conversion of these salts in a aqueous ammonia solution [6, 7]. There are no clear recommen-dations on the process conditions for the interaction of phosphogypsum and KCl in order to obtain potassium sulfate.

The Egyptian phosphogypsum waste is treated using sulfuric acid prior the ammonium sulfate production. The relevant factors that would affect the removal efficiencies of some impurities are studied. The optimum conditions of the treatment are 8 M sulfuric acid solution and 1/4 solid/liquid ratio for 30 min contact time at 80 °C.

all over the world. Phosphogypsum is a large -capacity waste material resulting from the production of wet -process phosphoric ac id in the process of sulfuric decomposition of apatites and phosphorites. The phosphogypsum contains approximately 3% of potassium phosphate, sodium, aluminum and ferrum as well as phosphoric acid and salts of heavy ...

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 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 ...

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]: CaSO4, 2H2 O + 2 KCl → K2 SO4 + CaCl2 + 2H2 O.

Phosphogypsum (PG) is an acidic by-product residue from the attack of phosphate mining by the sulfuric acid in order to produce the phosphoric acid.

The production of potassium sulfate from phosphogypsum and potassium chloride in the presence of ammonia and isopropanol has been investigated. The solubility of …

This paper proposes a very attractive process for K2SO4 production via the wet conversion of phosphogypsum (PG) and K2CO3. A parallel study of the conversion of two synthetic types of gypsum by ...

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 ...

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 …

Effect of excess phosphogypsum on the production of potassium sulfate at 25 • C, 1 atm, 33% ammonia, 7% isopropanol, 4.32:1 ammonia solution to phosphogypsum ratio, and mixer speed=230 rpm ...

This paper proposes a very attractive process for K2SO4 production via the wet conversion of phosphogypsum (PG) and K2CO3. A parallel study of the conversion of two synthetic types of gypsum by ...

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 solutions ...

Solubility of calcium sulfate in concentrated aqueous chloride solutions is of particular significance in chloride hydrometallurgy and various crystallization processes, such as the production of potassium sulfate from phosphogypsum and potassium chloride. This paper examines an example of the second type of application in which gypsum and potassium chloride are …

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 ...

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]: CaSO4, 2H2 …

The energy of activation in this case was estimated to be 58.5 kJ/mol. Abu-Eishah [10] studied the production of potassium sulfate from potassium chloride and phosphogypsum using aqueous solutions ...

Solubility of calcium sulfate in concentrated aqueous chloride solutions is of particular significance in chloride hydrometallurgy and various crystallization processes, such as the production of …

The production of potassium sulfate from phosphogypsum and potassium chloride in the presence of ammonia and isopropanol has ... The Phosphogypsum process Potassium sulfate can be produced by the ...

1.1.3. Production of potassium sulfate from potash and sodium sulfate Potassium chloride can be reacted with various sulfate salts to form a double salt that can be decomposed to recover potassium ...

Solubility of calcium sulfate in concentrated aqueous chloride solutions is of particular significance in chloride hydrometallurgy and various crystallization processes, such as the production of potassium sulfate from phosphogypsum and potassium chloride. This paper examines an example of the second type of application in which gypsum and potassium …

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 …