Comparison of float-sink and progressive release flotation of ground products of coal middlings

• Autorzy: Xie W. , He Y. , Luo C. , Zhang X. , Li H. , Yu J. , Wang H. , Shi F.

Identyfikatory

DOI

10.5277/ppmp150225

• Języki publikacji: EN

Abstrakty

EN

An additional recovery of coking coal middlings can be utilized for increasing of the concentrate yield of coking coal. A combined flow sheet of comminution and flotation can realize this target. To investigate the effect of grinding process on further flotation of ground products, progressive release flotation tests were used to compare with the float-sink tests, which were regarded as a criterion. Coal middlings were ground by wet-milling with iron balls to <0.5 mm. Curves of ash vs. cumulative yields of sized products indicated that the concentrate yield of coal separated by progressive release flotation was lower than that of coal benefited by the float-sink test, with the same ash for four size fractions (0.5-0.25 mm, 0.25-0.125 mm, 0.125-0.074 mm and <0.074 mm). Distributions of elements conducted by energy disperse spectroscopy (EDX) showed that associated kaolinite was liberated and exposed on the surface. It led to the shift of local surface property from hydrophobicity to hydrophilicity. Meanwhile, analyses of chemical property performed by an X-Ray photoelectron spectrometer (XPS) depicted that the hydrophilic mineral FeOOH, which generated in the grinding process, was adsorbed on the coal surface. Flotation of the ground products were worsened due to the increase of hydrophilicity of the coal surface.

Słowa kluczowe

EN

coal middlings; float-sink; progressive release flotation; XPS; EDX

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Physicochemical Problems of Mineral Processing
• Rocznik: 2015
• Tom: Vol. 51, iss. 2
• Strony: 675--684
• Opis fizyczny: Bibliogr. 20 poz., rys., tab.

Twórcy

autor

Xie W.

• School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China

autor

He Y.

• School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China
• Advanced Analysis and Computation Center, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China

autor

Luo C.

• School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China

autor

Zhang X.

• School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China

autor

Li H.

• School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China

autor

Yu J.

• School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China,

autor

Wang H.

• School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China

autor

Shi F.

• University of Queensland, Sustainable Minerals Institute, Julius Kruttschnitt Mineral Research Centre

Bibliografia

• BECKER D., CHERKASHININ G., HAUSBRAND G., JAEGERMANN W., 2013, XPS study of diethyl carbonate adsorption on LiCoO2 thin films. Solid State Ionics 230: 83-85.
• BOKANYI L., CSOKE B., 2003, Preparation of clean coal by flotation following ultrafine liberation. Appl. Energ. 74: 349-358.
• Bruckard W.J., Sparrow G.J., Woodcock J.T., 2011, A review of the effects of the grinding environment on the flotation of copper sulphides. Int. J. Miner. Process. 100: 1-13.
• CUI L., AN L., GONG W., JIANG H., 2007, A novel process for preparation of ultra-clean micronized coal by high pressure water jet comminution technique. Fuel 86: 750-757.
• ELHAM D., HADI Z., BEHDAD M., 2013, A combined experimental and theoretical study on aboratory-scale comminution of coal and biomass blends. Powder Technol. 235:412-421.
• FU X., SHAN X., JIANG H., 2006, Study on the flotation technology for deep-cleaning of coal slime. J. China Coal Soc. 31:90-93.
• GONCALVES K.L.C., ANDRADE V.L.L., PERES A.E.C., 2003, The effect of grinding conditions on the flotation of a sulphide copper ore. Miner. Eng. 16: 1213-1216.
• GU G., ZHONG Z., 2008, Electrochemical properties on surface of galena in grinding system and its influence on flotation. J. Central South Univer. (Sci. Technol.) 9: 54-58.
• GUO Y., TANG Y., WANG S., LI W., JIA L., 2013, Maceral separation of bark liptobiolite and molecular structure study through high resolution TEM images. J. China Coal Soc. 38:1021-1024.
• LIU F., LI W., GUO H., ET AL., 2011, XPS study on the change of carbon-containing groups and sulfur transformation on coal surface. J. Fuel Chem. Technol. 39: 81-84.
• LYTLE J.M., DANIEL J.L., TINGEY G.L., 1983, Concentration of sulphur and mineral rich components in particle classes during coal comminution. Fuel 61:1299-1303.
• MIETTUNEN H., KAUKONEN R., CORIN K., OJALA S., 2012, Effect of reducing grinding conditions on the flotation behaviour of low-S content PGE ores. Miner. Eng. 36:195-203.
• MOSLEMI H., SHAMSI P., HABASHI F., 2011, Pyrite and pyrrhotite open circuit potentials study: Effects on flotation. Miner. Eng. 24: 1038-1045.
• SHI F., ZUO W., 2014, Coal breakage characterization-Part 1: Breakage testing with the JKFBC. Fuel 117: B: 1148-1155.
• SOKOLOVIC J., STANOJLOVIC R., MARKOVIC Z., 2012, Activation of oxidized surface of anthracite waste coal by attrition. Physicochem. Probl. Miner. Process. 48: 5-18.
• XIA W., YANG J., ZHAO Y., ET AL., 2012, Improving floatability of taixi anthracite 176 coal of mild oxidation by grinding. Physicochem. Probl. Miner. Process. 48: 393-401.
• XIA W., YANG J., LIANG C., 2013, Effect of microwave pretreatment on oxidized coal flotation. Powder Technol. 233: 186-189.
• XIE W., HE Y., ZHU X., ET AL, 2013, Liberation characteristics of coal middlings comminuted by jaw crusher and ball mill. Int. J. Min. Sci. Technol. 23: 669-674.
• ZHAO W., 2010, Study on modification of macerals in Shenfu coals and its flotability. Master thesis Xidian University.
• ZUO W., ZHAO Y., HE Y., ET AL., 2012, Relationship between coal size reduction and energy input in Hardgrove mill. Int. J. Min. Sci. Technol. 22: 121-124.