Potassium Sulfate from Syngenite by High–Temperature Extraction with Water

Clarke, Loyal; Partridge, Everett P.

doi:10.1021/ie50296a023

Cited by 11 publications

(6 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Changes in the crystallization areas of the individual salts are also considerable, especially in the cases of polyhalite, syngenite and magnesium sulphate (in comparison with the isotherms for the system K,SO,-Mg SO,-CaSO,-HH,O a t lower temperatures). Thus the polyhalite crystallization area, small at 308 K [5], and situated within the region of high MgSO, concentrations, at 373K undergoes a remarkable cnlargement [9] at the expense of the syngenite [14]). The solubility of calcium sulphate does not change a t temperatures above 373 K and it does not exceed 0,2y0.…”

Section: Resultsmentioning

confidence: 99%

Phase system K₂SO₄MgSO₄CaSO₄H₂O at temperatures above 373 K

Dankiewicz¹,

Kozinska²

1982

Zeitschrift anorg allge chemie

View full text Add to dashboard Cite

Studies on the phase relationships in the system K2SO4MgSO4CaSO4H2O were carried out at 423, 473 and 523 K. On the basis of experimental results, literature data on the solubilities of simple salts and the possibilities of paragenesis of salts known to occur in this system, 3 — dimensional phase diagrams were constructed for the three temperatures. The data obtained were utilized in developing a possible method of processing polyhalite — by causing its decomposition through the action of water at temperatures above 373 K.

show abstract

Section: Resultsmentioning

confidence: 99%

Phase system K₂SO₄MgSO₄CaSO₄H₂O at temperatures above 373 K

Dankiewicz¹,

Kozinska²

1982

Zeitschrift anorg allge chemie

View full text Add to dashboard Cite

show abstract

“…The syngenite decomposed into CaSO 4 , which was slightly soluble in water. When the concentration ratio of Ca 2+ /SO4 2− reached a certain value, K 2 SO 4 and CaSO 4 can form double salts in aqueous solution system [15]. Thus, the K and Ca was precipitated with the formation of K 2 Ca 2 (SO 4 ) 3 by crystallization.…”

Section: Effect Of Cao Addition On Water Leaching Productmentioning

confidence: 99%

“…This indicates that the reaction degree of desulfurization was increased. K 2 Ca 2 (SO 4 ) 3 easily decomposed into K 2 SO 4 and CaSO 4 in aqueous solution [15]. The recovery ratio of K remarkably increased, to 72-82%, due to the high solubility of K 2 SO 4 in water.…”

Section: X-ray Diffraction (Xrd) Analysismentioning

confidence: 99%

“…Consequently, the Al-O-Al bonds were broken, and Al 3+ in the framework of alunite was released and reacted with [SO4] tetrahedron groups to form Al 2 (SO 4 ) 3 . K 2 Ca 2 (SO 4 ) 3 easily decomposed into K 2 SO 4 and CaSO 4 in aqueous solution [15]. Since Al 2 (SO 4 ) 3 was soluble in water, the recovery ratio of Al increased significantly, from 1% to 10%.…”

Section: X-ray Diffraction (Xrd) Analysismentioning

confidence: 99%

See 1 more Smart Citation

Recovery of Soluble Potassium from Alunite by Thermal Decomposition: Effect of CaO and Phase Transformation

Zhong¹,

Qiu²,

Gao³

et al. 2019

Metals

View full text Add to dashboard Cite

As mining waste, alunite is a potential resource to produce potassium salt. The decomposition of alunite is closely associated with the recovery of soluble potassium. In this study, the effect of CaO on phase transformation of alunite in the desulfation stage was examined. The results showed that CaO was beneficial to the desulfation of alunite. The decomposition temperature to obtain soluble potassium salt (K2SO4) was reduced from 800 °C to 700 °C by adding CaO. When the mass ratio of CaO/alunite was 0.1, 81% of soluble potassium was extracted by water leaching after calcination at 700 °C for 2 h. The mechanism of CaO to promote the disintegration of alunite was proposed through analyzing the phase transformation sequences. Alkaline Ca ion was inclined to bond with acidic [SO4] groups, and thus the breakage of S–O linkages between [AlO6] octahedron and [SO4] tetrahedron were improved. Monomer [SO4] tetrahedrons were released to form K2SO4 at a lower decomposition temperature. With the increase of the amount of CaO, the excess CaO bonded with neutral Al. [AlO6] tetrahedrons in alunite transformed into [AlO4] octahedrons due to the breakage of the Al–O network. Al3+ was dissociated and bonded with [SO4] tetrahedron to form soluble Al salts.

show abstract

“…The data for 210°, 220°, and 230°C. have been plotted together with the data by Hill (11) for the equilibrium with dense anhydrite at 100°and with those by Clarke and Partridge (4) for the equilibrium at 200°C . ; these present a continuous curve from 100°to 230°C.…”

Section: Mixtures Of Complex Saltsmentioning

confidence: 99%

Potassium Sulfate from Polyhalite Extraction from Aqueous Mixtures in Which Calcium Sulfate Is Synthesized

Schoch¹

1935

Ind. Eng. Chem.

View full text Add to dashboard Cite

Since the discovery of minable beds of pure polyhalite in Texas in 1926, the writer has developed four processes for the manufacture of commercial products from it which are progressively of better economic promise. The first three processes are reviewed.INDUSTRIAL AND ENGINEERING CHEMISTRY VOL. 27, NO. 4 of boiling water. The progress of the solution is indicated by the following figures: Time of Boiling KiSO. MgSOt CaSOi Min.

show abstract

Potassium Sulfate from Syngenite by High–Temperature Extraction with Water

Cited by 11 publications

References 5 publications

Phase system K₂SO₄MgSO₄CaSO₄H₂O at temperatures above 373 K

Phase system K₂SO₄MgSO₄CaSO₄H₂O at temperatures above 373 K

Recovery of Soluble Potassium from Alunite by Thermal Decomposition: Effect of CaO and Phase Transformation

Potassium Sulfate from Polyhalite Extraction from Aqueous Mixtures in Which Calcium Sulfate Is Synthesized

Contact Info

Product

Resources

About

Potassium Sulfate from Syngenite by High–Temperature Extraction with Water

Cited by 11 publications

References 5 publications

Phase system K2SO4MgSO4CaSO4H2O at temperatures above 373 K

Phase system K2SO4MgSO4CaSO4H2O at temperatures above 373 K

Recovery of Soluble Potassium from Alunite by Thermal Decomposition: Effect of CaO and Phase Transformation

Potassium Sulfate from Polyhalite Extraction from Aqueous Mixtures in Which Calcium Sulfate Is Synthesized

Contact Info

Product

Resources

About

Phase system K₂SO₄MgSO₄CaSO₄H₂O at temperatures above 373 K

Phase system K₂SO₄MgSO₄CaSO₄H₂O at temperatures above 373 K