Experimental study and numerical simulation on fly ash separation with different plate voltages in rotary triboelectrostatic separator
Ling Zhang 1,   Youjun Tao 2  
,   Dongping Tao 3,   Weichi Zhang 1,   Lu Yang 1
 
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1
School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
2
China University of Mining and Technology
3
School of Mining Engineering, University of Science and Technology Liaoning, Anshan, 114051, Liaoning, China
CORRESPONDING AUTHOR
Youjun Tao   

China University of Mining and Technology, No1,Daxue Road,Xuzhou,Jiangsu,P.R.China, 221116 Xuzhou, China
 
Physicochem. Probl. Miner. Process. 2018;54(3):722–731
 
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ABSTRACT
As the main solid wastes of coal-fired power plants, fly ash particles with different electrical properties are usually recycled using triboelectrostatic separator. The purpose of this study was to investigate the effect of different plate voltages on the separation of fly ash in a rotary triboelectrostatic separator with experiments and numerical simulation. The maximum values of yield of ash products (48.30%), and decarbonisation rate (50.89%) and the minimum loss-on-ignition (6.61%) were obtained when the plate voltage was 24 kV in the separation experiments, while 55.98%, 59.46%, 5.80% were reached respectively when the plate voltage was 26 kV in the simulation. In general, experimental data were similar with numerical simulation. The turning points appeared around 25 kV due to the increasing mismatch in products, which resulted from the reinforced rebound phenomena, namely the charged particle rebound from the electrode plate with a larger reflection velocity, when the plate voltage increased from 18 to 28 kV. It was validated by the numerical simulation results.
 
REFERENCES (16)
1.
ALTUN, N. E., XIAO, C., AND HWANG, J. Y., 2009. Separation of unburned carbon from fly ash using a concurrent flotation column. Fuel Process. Technol., 90(12), 1464-1470.
 
2.
CHEN, J., HONAKER, R., 2015. Dry separation on coal–silica mixture using rotary triboelectrostatic separator. Fuel Process. Technol., 131, 317-324.
 
3.
DWARI R. K., RAO K. H., 2009. Fine coal preparation using novel tribo-electrostatic separator. Miner. Eng., 2009, 22(2):119-127.
 
4.
DANIEL, T., FAN, M. M., JIANG, X. K., 2009. Dry coal fly ash cleaning using rotary triboelectrostatic separator. Min. Sci. Tech., 19(5), 642-647.
 
5.
DANIEL, T., MOHAMMAD, A.H., 2010. Beneficiation study of Eshidiya phosphorites using a rotary triboelectrostatic separator. Min. Sci. Tech., 20(3), 357-364.
 
6.
DANIEL, T., SOBHY, A., LI, Q., HONAKER, R., ZHAO, Y., 2011. Dry cleaning of pulverized coal using a novel rotary triboelectrostatic separator (RTS). Int. J. Coal Prep. Util., 31(3-4), 187-202.
 
7.
LI, H. S., ZHANG, X. X., CHEN, Y. H., 2012. Collision characteristics of particles in the friction device of triboelectrostatic separator. J. China U. Min. Technol., 41(4), 607-612.
 
8.
HURST, V. J., STYRON, R. W., 1978. Fly ash beneficiation process. U.S. Patent No. 4,121,945.
 
9.
HUANG, Y., TAKAOKA, M., TAKEDA, N., 2003. Removal of unburned carbon from municipal solid waste fly ash by column flotation. Waste Manage., 23(4), 307-313.
 
10.
MÜHLICH, P., CASE, W., HÖRMANSPERGER, J., BEYRER, M., WINDHAB, E. J., 2016. Particle image velocimetry (PIV) in food powders during vacuum-steam-vacuum (VSV) treatment. Powder Technol., 299, 1-8.
 
11.
MOHANTA, S. K., ROUT, B., DWARI, R. K., REDDY, P. S. R., MISHRA, B. K., 2016. Tribo-electrostatic separation of high ash coking coal washery rejects: Effect of moisture on separation efficiency. Powder Technol., 294, 292-300.
 
12.
WANG H., CHEN S., CAI B., GE L., CHEN Q., 2014. Triboelectric Separation Study on the Dynamics of Tribocharged Coal and Mineral Particles in Free-Fall Triboelectric Separator. Sep. Sci. Technol. 49(18):2990-2998.
 
13.
TAO Y., ZHU X., TAO D., DENG M., ZHANG X., 2016. Optimization of triboelectrostatic decarbonization experiment of fly ash by Design-Expert. J. China coal Soc., 41(2), 475-482.
 
14.
TAO Y., ZHANG, J., WANG, X., DENG, M., TAO, D., 2014. Study of rotary triboelectrostatic separation and decarbonization of fly ash. J. China U. Min. Technol., 43(4), 672-677.
 
15.
ZHANG, W., HONAKER, R., 2015. Studies on carbon flotation from fly ash. Fuel Process Technol., 139, 236-241.
 
16.
ZHANG, X. X., DUAN, C. H., FENG-QIN, Y. U., GAO, M. H., JING-MIN, H. E., 2005. Electric property and tribocharging of fine coal. J. China U. Min. Technol., 34(6), 694-697.
 
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