The Effect of Microwave Energy on Grindability of a Turkish High-Ash Coal

M.S. Delıbalta, O. Y. Toraman

Abstract


In the present study, the effect of microwave energy on grindability of high-ash (46.39%) and sulphur (3.99%) Turkish coal has been investigated. Coal samples (-9.52+3.18 mm) was treated by microwave at a frequency of 2.45 GHz with different power levels (0.48-0.64-0.80 kW) and residence times (30-150 s.). In order to determine the crushing/grinding resistance of low ranked lignite coal samples treated by microwave oven, the Impact Strength Index (ISI) test was applied for each treated and untreated sample and compared with each other. Experimental results have shown that significant increases in grindability were achieved when the coal samples were exposed to microwave radiation. The ISI of samples decreased up to 96%.

Key words: Microwave energy; Low rank coal; Crushability; Grindability; Impact strength ındex (ISI)


Keywords


Microwave energy; Low rank coal; Crushability; Grindability; Impact strength ındex (ISI)

Full Text:

PDF

References


[1] Harrison P.C., & Rowson, N.A. (1996). The Effect of Heat Treatment on the Grindability of Coal. I. Chem. E. Res. Event, 268-271.

[2] Jones, D.A., Lelyveld, T.P., Mavrofidis, S.D., Kingman S.W., & Miles, N.J. (2002). Microwave Heating Applications in Environmental Engineering-A Review. Resour. Conserv. Recycl. 34(2), 75-90.

[3] Lytle, J., Choi, N., & Prisbrey, K. (1992). Influence of Preheating on Grindability of Coal. Int. J. Miner. Process., 36(1-2), 107–112.

[4] Meikap, B.C., Purohit, N.K., & Mahadevan, V. (2005). Effect of Microwave Pretreatment of Coal for İmprovement of Rheological Characteristics of Coal-Water Slurries. J. Colloid Interface Sci., 281(1), 225–235.

[5] Sahoo, B.K., Prakash, R., & Meikap, B.C. (2007). International Conference on Beneficiation of Fines and İts Technology (pp. 42–48). Jamshedpur: Tata Steel Ltd.

[6] Marland, S., Han, B., Merchant A., & Rowson, N. (2000). The Effect of Microwave Radiation on Coal Grindability. Fuel, 79(11), 1283-1288.

[7] Harrison P.C., & Rowson, N.A. (1997). The Effect of Microwave and Conventional Heat Treatment on the Comminution of Coal. Fuel and Energy Abstracts, 38(5), 292.

[8] Toraman, O.Y., Kahraman, S., & Cayirli, S. (2010). Predicting the Crushability of Rocks from the Impact Strength Index. Minerals Engineering, 23(9), 752-754.

[9] Ozbayoglu G., & Depci, T. (2006, Oct.). Microwave Radiation Effect on Coal Grindability. 15th Int. Coal Prep. Congress, Beijig, China.

[10] Sahoo, B.K., De, S., & Meikap, B.C. (2011). Improvement of Grinding Characteristics of Indian Coal by Microwave Pre-treatment. Fuel Processing Technology, 92(10), 1920–1928.

[11] Protodyakanov, E.I. (1950). Determination of Coal Strength at Mines. Ugol, 25, 20-24.

[12] Evans I., & Pomeroy, C.D. (1966). The Strength, Fracture and Workability of Coal. London: Pergamon Press.

[13] Paone, J., Madson, D., & Bruce, W. E. (1969). Drillability Studies-Laboratory Percussive Drilling. USBM RI 7300.

[14] Tandanand, S., & Unger, H. F. (1975). Drillability Determination-a Drillability İndex of Percussive Drills. USBM RI 8073.

[15] Rabia, H., Brook, W. (1980). An Empirical Equation for Drill Performance Prediction. In: Proc. 21st US Symp. Rock Mech Univ., Missouri-Rolla (pp. 103–111).

[16] Kahraman, S. (2001). Evaluation of Simple Methods for Assessing the Uniaxial Compressive Strength of Rock. Int. J. Rock Mech. &Mining Sci., 38(7), 981-994.

[17] Toraman, O.Y. (2010). The Effect of High Power Microwave Energy on the Grindability of Turkish Cayirhan Lignite. Energy Sources, Part A, 32, 1794-1800.

[18] Su, O., Toroglu I., & Akcın, N.A. (2010). An Evaluation of the Impact Strength Index as a Criterion of Grindability. Energy Sources, Part A, 32, 1671-1678.




DOI: http://dx.doi.org/10.3968%2Fj.est.1923847920120302.293

Refbacks

  • There are currently no refbacks.


Reminder

If you have already registered in Journal A and plan to submit article(s) to Journal B, please click the CATEGORIES, or JOURNALS A-Z on the right side of the "HOME".


We only use three mailboxes as follows to deal with issues about paper acceptance, payment and submission of electronic versions of our journals to databases: caooc@hotmail.com; est@cscanada.net; est@cscanada.org

Copyright © 2010 Canadian Research & Development Centre of Sciences and Cultures
Address: 730, 77e AV, Laval, Quebec, H7V 4A8, Canada

Telephone: 1-514-558 6138
Http://www.cscanada.net Http://www.cscanada.org

E-mail: est@cscanada.net est@cscanada.org