Solar drying and thermodynamic sorption properties of phosphate sludge downstream of mine waste reclamation processes. (2022)

• Record Type: Journal Article
• Authors: Abdenouri, Naji; Mazouz, Hamid; Hasnaoui, Mohammed; Salhi, Issam; Doubabi, Said; Flamant, Gilles
• Is Part Of: Materials today. Volume 51:Part 6(2022)
• Page Start: 1924
• Page End: 1930
• Publication Date: 2022
• Subjects: Hybrid solar dryer -- Phosphate sludge -- Sorption -- Thermodynamics properties -- Sludges storage -- Energy efficiency; Materials science -- Congresses -- Periodicals; 620.1
• DOI: 10.1016/j.matpr.2021.03.136
• Languages: English
• ISSNs: 2214-7853

Abstract

Abstract: Phosphate sludge generated at the end of the phosphate enrichment operations can be reused after being subject to drying processes. For efficient drying treatment and also for saving storage, the hygroscopic properties of the phosphate sludge have to be determined. In this paper, the adsorption and desorption behaviors were studied. The drying of phosphate sludge in a hybrid solar dryer requires between 90 min at 60 °C and 180 min at 40 °C. The isosteric energy was calculated from the experimental tests and varies from 2 kJ/mol to 25 kJ/mol respectively from the wetted to dried product. From the moisture content evolution, the computed water diffusivity inside tailing varies from 1.70 10 -7 m 2 /s at 30 °C to reach 2.49 10 -7 m 2 /s at 60 °C.