- Title
- Kinetic and thermodynamic parameters of silica leaching from Camden power station fly ash
- Creator
- Falayi, Thabo, Ntuli, Freeman, Okonta, Felix Ndubisi
- Subject
- Fly ash, Leaching, Potassium silicate, Silicate leaching
- Date
- 2015
- Type
- Article
- Identifier
- uj:5142
- Identifier
- ISBN 978-1-61804-270-5
- Identifier
- http://hdl.handle.net/10210/14120
- Description
- Fly ash from a South African power station ash dam was used. The fly ash approximated Class F fly ash but had a loss on ignition greater than 6%. The leaching parameters investigated were leaching time, KOH concentration, agitation speed, fly ash particle size, leaching temperature and liquid solid ratio (L/S). It was found that the optimum leaching conditions were leaching time of 6 h, 3M KOH, 500 rpm agitation speed, 25 L/S ratio, leaching temperature of 100˚C. Silica leaching followed a modified Jander equation kinetics with an N value of 1.48 and an activation energy of 5.9 kJ/mol.
- Publisher
- Advances in Environmental and Agricultural Sciences
- Rights
- ©2015, authors
- Full Text
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