Affiliation:
1. Université de Lorraine, GeoRessources Laboratory, France
2. BRGM, Orléans, France
Abstract
This work deals with the extraction of phosphorus chlorinated compounds from
phosphate materials using chlorination with gaseous chlorine. An industrial
sample of dicalcium phosphate dihydrate, after transformation into calcium
pyrophosphate (Ca2P2O7), is subjected to reactions with Cl2+CO+N2 and
Cl2+C+N2 at temperatures ranging from 625 to 950?C using boat experiments.
Gathering results of the thermodynamic predictions and TG/DT analysis with
those of SEM and XRD examinations of the chlorinated residues allowed the
interpretation of phenomena and reactions mechanism occurring during the
calcium pyrophosphate carbochlorination. Reaction rate of Ca2P2O7 by
Cl2+CO+N2 at 950?C is slowed down due to the formation of a CaCl2 liquid
layer acting as a barrier for the diffusion of the reactive gases and further
reaction progress. While, the carbochlorination with Cl2+C+N2 led to almost
full chlorination of Ca2P2O7 at 750?C and the process proceeds with an
apparent activation energy of about 104 kJ/mol between 625 and 750?C.
Carbochlorination technique can be considered as an alternative and selective
route for the valorization of low grade phosphates and for the phosphorus
extraction from its bearing materials.
Publisher
National Library of Serbia
Subject
Materials Chemistry,Metals and Alloys,Mechanics of Materials,Geotechnical Engineering and Engineering Geology
Cited by
6 articles.
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