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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
environmental science
Phosphate sludge: Thermal transformation and use as lightweight aggregate material
Journal of Environmental Management, Volume 130, Year 2013
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Description
Phosphate sludge generated from beneficiation plants of Moroccan phosphate rocks was investigated at 900-1200°C by X-ray diffraction, scanning electron microscopy, thermal analysis and Fourier-transform infrared spectroscopy. Mixtures of the phosphate sludge and a swelling clay (up to 30wt.%) were investigated and their properties (shrinkage, density, water absorption and compressive strength) were measured as a function of temperature and clay addition. The results showed that gehlenite neoformed from lime of decomposed carbonates and breakdown products of clay minerals and that fluorapatite (original mineral) resisted heating until fusion. The measured properties were mainly controlled by temperature, and the effect of clay addition was less regular, except for water absorption. Considering the mixtures densities (1.44-3.02g/cm3), lightweight agglomerates can be produced at 900 or 1100°C, but their compressive strengths were relatively low (2-4.5MPa). Based on SiO2-Al2O3-Fluxes diagram and taking account of the chemical composition of the materials used, the production of expanded aggregates requires clay additions as high as 80wt.%. © 2013 Elsevier Ltd.
Authors & Co-Authors
Loutou, Mohamed
Morocco, Marakech
Faculté Des Sciences Semlalia
Morocco, Marakech
Université Cadi Ayyad
France, Toulon
Université de Toulon
Hajjaji, M.
Morocco, Marakech
Faculté Des Sciences Semlalia
Mansori, Mohammed
Morocco, Marakech
Université Cadi Ayyad
Favotto, Claude L.
France, Toulon
Université de Toulon
Hakkou, R.
Morocco, Marakech
Université Cadi Ayyad
Statistics
Citations: 74
Authors: 5
Affiliations: 3
Identifiers
Doi:
10.1016/j.jenvman.2013.09.004
ISSN:
03014797
Research Areas
Environmental