Chemical and structural changes of raw phosphate during heat treatment - IMT Mines Albi-Carmaux Accéder directement au contenu
Article Dans Une Revue High-temperature materials and processes Année : 2004

Chemical and structural changes of raw phosphate during heat treatment

Résumé

In the wet phosphoric acid production using calcined phosphate particles, physical structure and chemical composition of used material have an impact on the reaction speed. In this study, porous properties of phosphate fraction size 125-200 mum after heating at different temperature between 240degreesC to 940degreesC were investigated. Fluorapatite, carbonate fluorapatite (Francolite), dolomite and calcite constitute the major minerals of the phosphate rock used. The results of TG/DTA, CRTA, IP, and ESEM observations were used to understand the chemical changes observed. The decline of the specific surface area (SSA) from 16.61 m(2)/g down to 0.81 m(2)/g was interpreted according to the thermal results. The increasing of the linear shrinkage % by sintering process is observed. This process begins near 240degreesC and reaches a maximum near 940degreesC. These results are in agreement with those in the literature. Some kinetic tests were undertaken at laboratory scale to elucidate the relationship between reactivity and porous properties of phosphate particles.
Fichier principal
Vignette du fichier
2004.A.Mgaidi et al.(chemical change of raw phosphate....)-HAL.pdf (2.19 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-01626708 , version 1 (08-03-2018)

Identifiants

  • HAL Id : hal-01626708 , version 1

Citer

A Mgaidi, F Ben Brahim, Driss Oulahna, Ange Nzihou, M El Maaoui. Chemical and structural changes of raw phosphate during heat treatment. High-temperature materials and processes, 2004, 23 (3), p.185-194. ⟨hal-01626708⟩
119 Consultations
493 Téléchargements

Partager

Gmail Facebook X LinkedIn More