- Title
- Mechanism and fine coal beneficiation of a pulsating airflow classifier
- Creator
- Yang, Yong; Ge, Linhan; He, Yaqun; Xie, Weining; Ge, Zhenzhou
- Relation
- International Journal of Coal Preparation and Utilization Vol. 39, Issue 1, p. 20-32
- Publisher Link
- http://dx.doi.org/10.1080/19392699.2017.1288622
- Publisher
- Taylor & Francis
- Resource Type
- journal article
- Date
- 2019
- Description
- Traditional air classifiers produce binary splits based on the terminal velocity rather than the density of the feed. In this study, a pulsating air with a sine-like shape wave was introduced into a vertical column air classifier to achieve the density dominant separation on -6+3 mm fine coal. A lab-scale separation device was used to investigate the effects of pulsating characteristics (amplitude and frequency) and particles volumetric concentration on pulsating airflow separation in a batch process. The optimum operating conditions of 34.1 cm pulsation amplitude, 2.45 Hz frequency and 500 g feed amount achieved 48.08% separation efficiency, 68.22% combustible matter recovery and produced a clean coal with 17.98% ash (from a feed containing 42.02% ash), 47.73% yield and Ep value of 0.17. The results showed that the pulsating air classifier has a potential for fine coal dry beneficiation. The motion of particles in a pulsating airflow field under a hindered settling condition has been presented.
- Subject
- dry beneficiation; fine coal; inertia force; pulsating air classifier
- Identifier
- http://hdl.handle.net/1959.13/1424026
- Identifier
- uon:38013
- Identifier
- ISSN:1939-2699
- Language
- eng
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