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ABSTRACT
A novel classified gravity system, comprised of a three-product cyclone and a fine high-frequency screen, was developed and tested for recovery of fine coal. The three-product cyclone is characterized by the primary cylinder and a secondary cyclone. The effects of major parameters of the secondary cyclone, such as vortex finder diameter, vortex finder length, and spigot diameter, were investigated by single-factor experiments. Regression models of the yield and ash content of clean coal were developed with statistical design of experiments and showed good correlations of experimental results. The regression models indicated that the spigot diameter had the largest impact on the yield and ash content of clean coal. It also indicated that spigot diameter and vortex finder diameter jointly affect performances of the three-product cyclone. The cylinder played a significant role in desliming of the feed, giving the secondary cyclone a better gravity-separation condition. Ash reductions of +0.150 mm fractions were all above 70%, which showed that the cyclone had significant effects on fine coal separation in the classified gravity system.
Acknowledgements
The assistance with lab testing that was provided by Quncang Wang is greatly appreciated.
Funding
Financial support for this work provided by the Fundamental Research Funds for the Central Universities (No. N130601003), the National Natural Science Foundation of China (Grant No. 51574061), SDUST Research Fund (2012KYTD102), and PuYang ZhongYuan Restar Petroleum Equipment Co., Ltd, are gratefully acknowledged.