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Publikováno v:
International Journal of Mining Science and Technology, Vol 31, Iss 6, Pp 1063-1074 (2021)
Physical upgrading of graphite is typically achieved with many stages of grinding and flotation to produce a concentrate with approximately 95% carbon grade. An innovative grinding and column flotation process has been developed for efficient graphit
Publikováno v:
International Journal of Mining Science and Technology, Vol 30, Iss 5, Pp 715-721 (2020)
The mineralogy and petrography of natural graphite in Saba Boru of Ethiopia indicate that there exists flake graphite with a slightly oval structured fine size according to our study on thin and polished sections. Herein, for estimating the carbon co
Publikováno v:
International Journal of Mining Science and Technology, Vol 30, Iss 3, Pp 387-395 (2020)
Nitrogen is widely used to prevent the spontaneous combustion of coal in underground coal mines. A spontaneous combustion-prone coal seam was studied to investigate the restraining effect of nitrogen on coal oxidation in different oxidation stages, b
Publikováno v:
International Journal of Mining Science and Technology, Vol 29, Iss 3, Pp 513-519 (2019)
Magnetically separable mesoporous activated carbon was prepared from brown coal in the presence of Fe3O4 as a bi-functional additive. Magnetic activated carbon (MAC) was characterized by low-temperature nitrogen adsorption, scanning electron microsco
Publikováno v:
International Journal of Mining Science and Technology, Vol 29, Iss 2, Pp 313-317 (2019)
Current use of enrichment and processing technologies of ores requires the introduction of closed circuits of water treatment. A decrease in technological properties is caused by accumulations of ion-molecular components in the circulating water. The
Autor:
Moshood Onifade, B. Genc
Publikováno v:
International Journal of Mining Science and Technology, Vol 28, Iss 6, Pp 933-940 (2018)
Spontaneous combustion of coal is a well-known phenomena around the globe. Apart from the coal itself, burning coal-shales is becoming a problem in the South African coal mines. Serious incidents of spontaneous combustion have been reported as a resu
Publikováno v:
International Journal of Mining Science and Technology, Vol 28, Iss 4, Pp 649-655 (2018)
Coal and coal-shale both tend to undergo spontaneous combustion under favourable atmospheric conditions. The Wits-Ehac index has been developed in South Africa since the late 1980’s to test the spontaneous combustion liability of coal. However, in
Autor:
Ya-Nan Wang, Wei-Tu Li, Yi-Bing Sun, Yang-Yang Zhang, Xian-Yong Wei, Fang-Jing Liu, Zhi-Min Zong
Publikováno v:
International Journal of Mining Science and Technology, Vol 28, Iss 2, Pp 335-342 (2018)
The extraction residue from Shengli lignite was sequentially dissolved in cyclohexane, benzene, methanol, ethanol, and isopropanol in an autoclave at 320 °C to afford soluble portions (SPs) 1–5 (SP1-SP5) and the final residue (FR). The total yield
Publikováno v:
International Journal of Mining Science and Technology, Vol 27, Iss 6, Pp 1043-1049 (2017)
Effects of collectors (butyl xanthate (BX), O-isopropyl-N-sulfur ethyl carbamate (Z-200) and emulsified kerosene), dereagent (sodium sulfide) and depressant thioglycollic acid (TGA) on the flotation of chalcocite and molybdenite were investigated thr
Autor:
Michael Camilleri, Zhejun Pan, Luke D. Connell, Deasy Heryanto, Nicholas Lupton, Regina Sander
Publikováno v:
International Journal of Mining Science and Technology, Vol 27, Iss 5, Pp 755-761 (2017)
Coal seams with high CO2 gas contents can be difficult to drain gas for outburst management. Coal has a high affinity for CO2 with adsorption capacities typically twice that of CH4. This paper presents an analysis of nitrogen injection into coal to e