Understanding the difficult selective separation characteristics of high-ash fine coal

• Autorzy: Yang Zili , Liu Min , Chang Guohui , Xia Yangchao , Li Ming , Xing Yaowen , Gui Xiahui

Identyfikatory

DOI

10.37190/ppmp/126427

• Języki publikacji: EN

Abstrakty

EN

As the supply of high-quality coals decreases and mechanical coal mining becomes more widespread, the high selective recovery of high-ash fine coal has become a prominent problem in the flotation process. Herein, we discuss the main reasons why the selective separation of high-ash fine coal is difficult. The analysis of high-ash fine coal properties shows that coarse particles (0.25-0.5 mm) account for 22.53% of the total size fraction and that 57.90% of the coal is moderate- or high-density (+1.4 g/cm3) intergrowth. Grinding experiments show that the traditional rod mill has little impact on the liberation of the intergrowth. Instead, its main function is to adjust the particle size composition to ensure that the particle sizes of high-ash fine coal are within the particle size range suitable for flotation. The flotation results show that a clean coal yield of 30.42%, with a 12.46% ash content, is obtained with the optimal flotation parameters through the roughing and cleaning flotation process. However, the flotation results also show that in the separation of high-ash fine coal, it is difficult to obtain clean coal with a high yield and low ash content at the same time. This is mainly due to the similar floatability of moderate-density and low-density coal particles, which allows a large number of moderate-density coal particles to be recovered, and a significant slime coating of clay on the coal’s surface that is generated during the flotation process. The results of this work provide valuable guidance for high-ash fine coal industrial flotation applications.

Słowa kluczowe

EN

high-ash fine coal; flotation; rod grinding; floatability; slime coating

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Physicochemical Problems of Mineral Processing
• Rocznik: 2020
• Tom: Vol. 56, iss. 5
• Strony: 874--883
• Opis fizyczny: Bibliogr. 28 poz., rys., tab.

Twórcy

autor

Yang Zili

• Chinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China

autor

Liu Min

• School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
• Chinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
• School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China

autor

Chang Guohui

• Chinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
• School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China

autor

Xia Yangchao

• Chinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
• School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China

autor

Li Ming

• Chinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
• School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China

autor

Xing Yaowen

• Chinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China

autor

Gui Xiahui

• Chinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China

Bibliografia

• ALI, D., HAYAT, M.B., ALAGHA, L., MOLATLHEGI, O.K., 2018. An evaluation of machine learning and artificial intelligence models for predicting the flotation behavior of fine high-ash coal. Adv. Powder Technol. 29(12), 3493-3506.
• ÇİÇEK, T., CÖCEN, İ., EEGİN, V.T., CENGİZLER, H., 2008. An efficient process for recovery of fine coal from tailings of coal washing plants. Energ. Source Part A 30(18), 1716-1728.
• DEMIRBAS, A., 2002. Demineralization and desulfurization of coals via column froth flotation and different methods. Energ. convers manage 43(7), 885-895.
• FUERSTENAU, M.C., JAMESON, G.J., YOON, R.H., 2007. Froth flotation: a century of innovation. SME. GHADYANI, A., NOAPARAST, M., SHAFAEI TONKABONI, S.Z., 2018. A study on the effects of ultrasonic irradiation as pretreatment method on high-ash coal flotation and kinetics. Int. J. Coal Prep. Util. 38(7), 374-391.
• GUI, X.H., CHENG, G., LIU, J.T., CAO, Y.J., LI, S.L., HE, Q.Q., 2013. Effects of energy consumption on the separation performance of fine coal flotation. Fuel Process. Technol. 115, 192-200.
• GUI, X.H., LIU, J.T., TAO, X.X., CAO, Y.J., WANG, Y.T., 2010. Studies on regulator experiment of a high-to-float highash fine coal, Applied Mechanics and Materials, 1104-1109.
• GUI, X.H., XING, Y.W., WANG, Y.W., XU, M.D., 2017. Fine coal flotation process intensification: Part 4-characteristics of easily floatable hard-to-separate fine coal flotation process. Coal Prep. Technol. (4), 92-97.
• HACIFAZLIOGLU, H., 2016. A new process for the production of medium quality fuels from coal washing plant coarse tailings. Energ. Source Part A 38(19), 2809-2815.
• HAN, O.H., KIM, M. K., KIM, B. G., SUBASINGHE, N., PARK, C. H., 2014. Fine coal beneficiation by column flotation. Fuel Process Technol. 126, 49-59.
• LEE, S.H., LEE, T.H., JEONG, S.M., LEE, J.M., 2019. Economic analysis of a 600 mwe ultra supercritical circulating fluidized bed power plant based on coal tax and biomass co-combustion plans. Renew Energ. 138, 121-127.
• LI, Z., FU, Y.H., YANG, C., YU, W., LIU, L.J., QU, J.Z., ZHAO, W., 2018. Mineral liberation analysis on coal components separated using typical comminution methods. Miner. Eng. 126, 74-81.
• LIU, J.T., 1999. Research on cyclonic-static micro-bubble flotation column and clean coal preparation. China University of Mining and Technology (Beijing), Beijing, pp. 18-23.
• NI, C., XIE, G.Y., LIU, B., PENG, Y.L., SHA, J., XIA, W.C., 2015. A design of an inclined froth zone in column flotation device to reduce ash content in clean coal. Inter. J. Coal Prep. Utiliz. 35(6), 281-294.
• PENG, Y.L., MAO, Y.Q., XIA, W.C., LI, Y.F., 2018. Ultrasonic flotation cleaning of high-ash lignite and its mechanism. Fuel 220, 558-566.
• SAHINOGLU, E., 2018. Cleaning of high pyritic sulfur fine coal via flotation. Adv. Powder Technol. 29(7), 1703-1712.
• SONG, S.X., VALDIVIESO, A.L., 1998. Hydrophobic flocculation flotation for beneficiating fine coal and minerals. Sep Sci. Technol. 33(8), 1195-1212.
• VAN NETTEN, K., GALVIN, K.P., 2018. Rapid beneficiation of fine coal tailings using a novel agglomeration technology. Fuel Process. Technol. 176, 205-210.
• WANG, Y.W., XING, Y.W., GUI, X.H., CAO, Y.J., XU, X.H., 2018. The characterization of flotation selectivity of different size coal fractions. Inter. J. Coal Prep. Utili. 38(7), 337-354.
• XIE, W.N., HE, Y.Q., ZHU, X.N., GE, L.H., HUANG, Y.J., WANG, H.F., 2013. Liberation characteristics of coal middlings comminuted by jaw crusher and ball mill. Inter. J. Min. Sci. Technol. 23(5), 669-674.
• XING, Y.W., GUI, X.H., CAO, Y.J., WANG, D.P., ZHANG, H.J., 2017a. Clean low-rank-coal purification technique combining cyclonic-static microbubble flotation column with collector emulsification. J. Clean. Prod. 153(1), 657-672.
• XING, Y.W., GUI, X.H., LIU, J.T., CAO, Y.J., ZHANG, Y., LI, S.L., 2016. Flotation behavior of hard-to-separate and highash fine coal. Physicochem. Probl. Mi. 52(2), 703-717.
• XING, Y.W., XU, X.H., GUI, X.H., CAO, Y.J., XU, M.D., 2017b. Effect of kaolinite and montmorillonite on fine coal flotation. Fuel 195, 284-289.
• XU, G.Q., CHEN, Y.R., BU, X.N., DONG, X.S., XIE, G.Y., SUN, Y.J., 2019. Separation performance of mechanical flotation cell and cyclonic microbubble flotation column: in terms of the beneficiation of high-ash coal fines. Energ. Source Part A, 1-11.
• XU, Z.H., LIU, J.J., CHOUNG, J.W., Zhou, Z., 2003. Electrokinetic study of clay interactions with coal in flotation. Inter J. Miner. Process. 68(1-4), 183-196.
• YANG, Z.L., XIA, Y.C., WEI, C.J., CAO, Y.J., SUN, W., LIU, P.K., CHENG, H.Z., XING, Y.W., GUI, X.H., 2019. New flotation flowsheet for recovering combustible matter from fine waste coking coal. J. Clean. Prod. 225, 209-219.
• YANG, Z.L., XING, Y.W., WANG, D.Y., XIA, Y.C., GUI, X.H., 2018. A new process based on a combination of gravity and flotation for the recovery of clean coal from flotation tailings. Energ. Source Part A 40(4), 420-426.
• ZHANG, Z.J., LIU, J.T., XU, Z.Q., MA, L.Q., 2013. Effects of clay and calcium ions on coal flotation. Inter. J. Min. Sci. Technol. 23(5), 689-692.
• ZOU, W.J., GONG, L., HUANG, J., ZHANG, Z.J., SUN, C.B., ZENG, H.B., 2019. Adsorption of hydrophobically modified polyacrylamide P(AM-NaAA-C16DMAAC) on model coal and clay surfaces and the effect on selective flocculation of fine coal. Miner. Eng. 142, 105887.