Preparation and modification of porous lightweight ceramsite and its performance investigation

In this study, fly ash was used as the main raw material to prepare a lightweight ceramsite which has a specific density close to that of water (0.95–1.05 g/cm3) and good wear resistance. The ceramsite was modified with positively charged iron oxide coating layer by heterogeneous coagulation and coa...

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Bibliographic Details
Published in:Desalination and water treatment 2013-06, Vol.51 (22-24), p.4651-4657
Main Authors: Lu, Mang, Xia, Guang-Hua, Liao, Run-Hua, Zhao, Xiao-Dong
Format: Article
Language:English
Subjects:
Adsorption
Applied sciences
Bulk density
Calcination
Coagulation
Coating
Coatings
Compressive strength
Crystal structure
Drinking water and swimming-pool water. Desalination
Electrical properties
Exact sciences and technology
Ferric chloride
Fly ash
Industrial wastewaters
Iron chlorides
Iron oxide
Iron oxides
Isoelectric point
Lightweight
Methylene blue
Modification
Morphology
Oxide coatings
Phase composition
Pollution
Porosity
Purification
Raw materials
Roasting
Surface chemistry
Thickness
Wastewaters
Water purification
Water treatment
Water treatment and pollution
Wear resistance
Weight reduction
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Summary:In this study, fly ash was used as the main raw material to prepare a lightweight ceramsite which has a specific density close to that of water (0.95–1.05 g/cm3) and good wear resistance. The ceramsite was modified with positively charged iron oxide coating layer by heterogeneous coagulation and coating method. The adsorption property, iron load, bulk density, apparent porosity, compressive strength, surface morphology, surface electrical property, and phase composition of the coating layer were characterized. The optimum modification conditions determined by methylene blue adsorption experiment were: 1 mol/L FeCl3 solution, calcination temperature 650°C, and calcination time 3 h. The modified ceramsite was covered with an iron oxide layer with uneven thickness. The main crystal phase of the coating layer was α-Fe2O3 which exhibited porous structures. The modified ceramsite has a good application prospect in water treatment and purification.
ISSN:1944-3986
1944-3994
1944-3986
DOI:10.1080/19443994.2012.745380