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Flotation and enhanced gravity separation based on different separation principles were carried out to investigate the desulphurization and deashing efficiency of fine oxidized coal. Surface properties of fresh and oxidized coals were tested by XPS and results showed that the contents of hydrophobic functional groups decreased while the content of hydrophilic functional groups increased after oxidization. Floatability and density analysis results showed that the floatability of coal samples decreased sharply because of oxidation, however, density composition of coal sample only had slight changes. Separation results showed that yields of gravity concentrates outclassed that of flotation concentrates, meanwhile, ash contents and sulfur contents of gravity concentrates were far lower than that of flotation concentrates. Yields and ash contents increased with the collector dosage and achieved to be 17.83 and 26.94% respectively when the collector dosage was 1600 g•Mg-1. Yields and ash contents of gravity concentrates decreased with the centrifugal force and increased with the recoil water flow with similar sulfur content. Clean coal with yield of 53.86%, ash content of 9.81%, sulfur content of 1.47% and with a corresponding desulphurization efficiency of 44.53% was achieved at centrifugal force of 107 g and recoil water flow of 13.3 dm3•min-1. For fine oxidized coal, enhanced gravity separation has a significant advantage of the separation efficiency compared with flotation.
Rocznik
Tom
Strony
634--646
Opis fizyczny
Bibliogr. 27 poz., rys., tab.
Twórcy
autor
- School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
autor
- Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
- Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
autor
- School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
autor
- School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
autor
- School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
Bibliografia
- BOYLU F., LASKOWSKI J.S., 2007, Rate of water transfer to flotation froth in the flotation of low-rank coal that also requires the use of oily collector, Int. J. Miner. Process. 83, 125-131.
- CINAR M., 2009, Floatability and desulfurization of a low-rank (Turkish) coal by low-temperature heat treatment, Fuel Process. Technol. 90, 1300-1304.
- GALVIN K.P., CALLEN A.M., SPEAR S., 2010, Gravity separation of coarse particles using the Reflux Classifier, Miner. Eng. 23, 339-349.
- HARRIS G.H., DIAO J., FUERSTENAU D.W., 1995, Coal flotation with nonionic surfactants, Coal Prep. 16, 135-147.
- HONAKER R.Q., WANG D., H.O.K., 1996, Application of the falcon concentrator for fine coal cleaning, Miner. Eng, 11 (9), 1143-1156.
- HONAKER R.Q., 1998, High capacity fine coal cleaning using an enhanced gravity concentrator, Miner. Eng. 11 (12), 1191-1199.
- IBRAHIM S.S., EL-ANADOLY B.E., FARAHAT M.M., SELIM A.Q., EL-MENSHAWY A.H., 2014, Separation of Pyritic Sulfur from Egyptian Coal Using Falcon Concentrator, Particul. Sci. Technol. 32, 588-594.
- JENA M.S., BISWAL S.K., RUDRAMUNIYAPPA M.V., 2008, Study on flotation characteristics of oxidized Indian high ash sub-bituminous coal, Int. J. Miner. Process. 87 (1-2), 42-50.
- JIA R., HARRIS G.H., FUERSTENAU D.W., 2000, An improved class of universal collectors for the flotation of oxidized and/or low-rank coal, Int. J. Miner. Process. 58, 99-118.
- KROLL-RABOTIN J., BOURGEOIS F., CLIMENT E., 2012, Experimental validation of a fluid dynamics based model of the UF Falcon concentrator in the ultrafine range, Sep. Purif. Technol. 92, 129-135.
- KROLL-RABOTIN J., BOURGEOIS F., CLIMENT E., 2013, Physical analysis and modeling of the Falcon concentrator for beneficiation of ultrafine particles, Int. J. Miner. Process. 121, 39-50.
- KROLL-RABOTIN J., SANDERS R.S., 2014, Implementation of a model for Falcon separation units using continuous size-density distributions, Miner. Eng. 62, 138-141.
- ORUC F., OZGEN S., SABAH E., 2010, An enhanced-gravity method to recover ultra-fine coal from tailings: Falcon concentrator, Fuel 89, 2433-2437.
- PI Kin S., Akgun M., 1997, The effect of premixing on the floatation of oxidized Amasra coal, Fuel Process. Technol. 51, 1-6.
- ROYAEI M.M., JORJANI E., CHELGANI S.C., 2012, Combination of Microwave and Ultrasonic Irradiations as a Pretreatment Method to Produce Ultraclean Coal, Int. J. Coal. Prep. Util. 32, 143-155.
- SIVRIKAYA O., 2014, Cleaning study of a low-rank lignite with DMS, Reichert spiral and flotation, Fuel 119, 252-258.
- SOKOLOVIC J.M., STANOJLOVIC R.D., MARKOVIC Z.S., 2012, Activation of oxidized surface of anthracite waste coal by attrition, Physicochem. Probl. Miner. Process. 48 (1), 5-18.
- SOKOLOVIC J.M., STANOJLOVIĆ R.D., MARKOVIĆ Z.S., 2012, The Effects of Pretreatment on the Flotation Kinetics of Waste Coal, Int. J. Coal Prep. Util. 32 (3), 130-142.
- TAO Y., LUO Z., ZHAO Y., TAO D., 2006, Experimental Research on Desulfurization of Fine Coal Using an Enhanced Centrifugal Gravity Separator, Int. J. Mining Sci. Technol. 16 (4), 399-403.
- XIA W., YANG J., ZHU B., 2012a, Flotation of oxidized coal dry-ground with collector, Powder Technol. 228, 324-326.
- XIA W., YANG J., ZHAO Y., ZHU B., WANG Y., 2012b, Improving floatability of Taixi anthracite coal of mild oxidation by grinding, Physicochem. Probl. Miner. Process. 48 (2), 393–401.
- XIA W., YANG J., LIANG C., 2013a, A short review of improvement in flotation of low rank/oxidized coals by pretreatments, Powder Technol. 237, 1-8.
- XIA W., YANG J., LIANG C., 2013b, Effect of microwave pretreatment on oxidized coal flotation, Powder Technol. 233, 186-189.
- XIA W., YANG J., 2013, Effect of pre-wetting time on oxidized coal flotation, Powder Technol. 250, 63-66.
- XIA W., YANG J., LIANG C., 2014, Investigation of changes in surface properties of bituminous coal during natural weathering processes by XPS and SEM, Appl. Surf. Sci. 293, 293-298.
- XIA W., YANG J., 2014, Changes in surface properties of anthracite coal before and after inside/outside weathering processes, Appl. Surf. Sci. 313, 320-324.
- ZHANG T., HE Y., WANG F., GE L., ZHU X., LI H., 2014, Chemical and process mineralogical characterizations of spent lithium-ion batteries: An approach by multi-analytical techniques, Waste Manage. 234, 1051-1058.
Typ dokumentu
Bibliografia
Identyfikator YADDA
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