- Title
- Upgrading of positively buoyant particles using an inverted reflux classifier
- Creator
- Kiani, A.; Zhou, J.; Galvin, K. P.
- Relation
- ARC.LP110100666 http://purl.org/au-research/grants/arc/LP110100666
- Relation
- Advanced Powder Technology Vol. 26, Issue 1, p. 119-125
- Publisher Link
- http://dx.doi.org/10.1016/j.apt.2014.08.014
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2015
- Description
- This paper is concerned with the separation of cenosphere particles from fly ash. Cenospheres are hollow alumina silicate micro-shells found in fly ash. They are positively buoyant in water, thus allowing gravity-separation to be used to achieve separation from negatively buoyant fly ash particles. In this study an Inverted Reflux Classifier, a combination of parallel inclined channels and a vertical fluidized bed, was used for the first time to recover and concentrate cenospheres from a real fly ash feed obtained from a coal fired power station. The effects of different operating parameters such as the feed rate, product rate, and fluidization rate were investigated. The device was fed at a solids flux of about 2600 kg/(m² h). A product grade of 76% was achieved from a feed with a grade of only 0.51%, corresponding to an upgrade of 149. Here, the recovery of the cenospheres was 42%. By increasing the overflow product rate, a significantly higher recovery of 64% was achieved, but at a reduced upgrade of 33. In both cases most of the losses were attributed to the relatively fine cenosphere particles being entrained to the underflow.
- Subject
- buoyant; cenosphere; fly ash; reflux classifier; fluidization
- Identifier
- http://hdl.handle.net/1959.13/1335755
- Identifier
- uon:27493
- Identifier
- ISSN:0921-8831
- Language
- eng
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