Development of a more efficient classifying cyclone

Rong, R and Napier-Munn, TJ (2003) Development of a more efficient classifying cyclone. Coal Preparation, 23 4: 149-165. doi:10.1080/07349340390211004


Author Rong, R
Napier-Munn, TJ
Title Development of a more efficient classifying cyclone
Journal name Coal Preparation   Check publisher's open access policy
ISSN 0734-9343
Publication date 2003
Sub-type Article (original research)
DOI 10.1080/07349340390211004
Volume 23
Issue 4
Start page 149
End page 165
Total pages 17
Editor J.S. Laskowski
Place of publication Philadelphia, USA
Publisher Taylor and Francis
Collection year 2003
Language eng
Subject C1
290702 Mineral Processing
650302 Coal
Abstract A more efficient classifying cyclone (CC) for fine particle classification has been developed in recent years at the JKMRC. The novel CC, known as the JKCC, has modified profiles of the cyclone body, vortex finder, and spigot when compared to conventional hydrocyclones. The novel design increases the centrifugal force inside the cyclone and mitigates the short circuiting flow that exists in all current cyclones. It also decreases the probability of particle contamination in the place near the cyclone spigot. Consequently the cyclone efficiency is improved while the unit maintains a simple structure. An international patent has been granted for this novel cyclone design. In the first development stage-a feasibility study-a 100 mm JKCC was tested and compared with two 100 min commercial units. Very encouraging results were achieved, indicating good potential for the novel design. In the second development stage-a scale-up stage-the JKCC was scaled up to 200 mm in diameter, and its geometry was optimized through numerous tests. The performance of the JKCC was compared with a 150 nun commercial unit and exhibited sharper separation, finer separation size, and lower flow ratios. The JKCC is now being scaled up into a fill-size (480 mm) hydrocyclone in the third development stage-an industrial study. The 480 mm diameter unit will be tested in an Australian coal preparation plant, and directly compared with a commercial CC operating under the same conditions. Classifying cyclone performance for fine coal could be further improved if the unit is installed in an inclined position. The study using the 200 mm JKCC has revealed that sharpness of separation improved and the flow ratio to underflow was decreased by 43% as the cyclone inclination was varied from the vertical position (0degrees) to the horizontal position (90degrees). The separation size was not affected, although the feed rate was slightly decreased. To ensure self-emptying upon shutdown, it is recommended that the JKCC be installed at an inclination of 75-80degrees. At this angle the cyclone performance is very similar to that at a horizontal position. Similar findings have been derived from the testing of a conventional hydrocyclone. This may be of benefit to operations that require improved performance from their classifying cyclones in terms of sharpness of separation and flow ratio, while tolerating slightly reduced feed rate.
Keyword Energy & Fuels
Mining & Mineral Processing
Classifying Cyclone
Separation Efficiency
Efficiency Curve
Separation Size
Flow Ratio
Hydrocyclone Performance
Separation
Model
Flow
Classification
Hydrodynamics
Q-Index Code C1

 
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