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Title:
FLOTATION METHOD FOR COAL HAVING POOR FLOATATION
Document Type and Number:
WIPO Patent Application WO/2017/219923
Kind Code:
A1
Abstract:
A flotation method for a coal having poor floatation comprises the following steps: supplying, by means of a pump (E), a solution containing nanobubbles (5) to a mineral slurry mixing tank (F), and simultaneously supplying an appropriate amount of coal (7) and a flotation reagent (8) to the mineral slurry mixing tank (F); and supplying, by means of a material feeding pump (G), a mineral slurry mixture (9) to a countercurrent static micro-bubble flotation column (H) to undergo floatation, thereby obtaining two resulting products, a fine coal (10) and a tailing (11). The flotation reagent consists of the following components: a kerosene, isopropyl ethylthionocarbamate, Tween 40, sodium alcohol ether sulphate, p-Toluenesulfonic acid, Span 60, phthalic anhydride, sodium dodecyl benzene sulfonate, and benzenedicarboxylic anhydride. The method utilizes a property of nanobubbles that the same preferentially gather at a hydrophobic surface, increasing the difference in hydrophobicity between the fine coal and coal gangue. The gathering of the nanobubbles also significantly reduces a fine mud covering a coal particle surface, thereby greatly reducing contamination caused by the fine mud, and increasing a recycling rate of the fine coal.

Inventors:
GUI, Xiahui (No. 1, Daxue RoadXuzhou, Jiangsu 6, 221116, CN)
XING, Yaowen (No. 1, Daxue RoadXuzhou, Jiangsu 6, 221116, CN)
LI, Chenwei (No. 1, Daxue RoadXuzhou, Jiangsu 6, 221116, CN)
CAO, Yijun (No. 1, Daxue RoadXuzhou, Jiangsu 6, 221116, CN)
YANG, Zili (No. 1, Daxue RoadXuzhou, Jiangsu 6, 221116, CN)
WANG, Dongyue (No. 1, Daxue RoadXuzhou, Jiangsu 6, 221116, CN)
Application Number:
CN2017/088699
Publication Date:
December 28, 2017
Filing Date:
June 16, 2017
Export Citation:
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Assignee:
CHINA UNIVERSITY OF MINING AND TECHNOLOGY (No. 1, Daxue RoadXuzhou, Jiangsu 6, 221116, CN)
International Classes:
B03D1/02
Domestic Patent References:
WO2011028738A22011-03-10
Foreign References:
CN106000658A2016-10-12
CN106076658A2016-11-09
US20090288995A12009-11-26
CN205253375U2016-05-25
Other References:
FAN, MAOMING ET AL.: "Nanobubble generation and its applications in froth flotation (part IV) mechanical cells and specially designed column flotation of coal", MINING SCIENCE AND TECHNOLOGY, vol. 20, no. 5, 31 October 2010 (2010-10-31), pages 641 - 671, XP027338652, ISSN: 2095-2686
Attorney, Agent or Firm:
BEIJING TIANDA INTELLECTUAL PROPERTY OFFICE (Room C07, 3rd Floor Guotu Culture Plaza,No. 91, West 3rd Ring North Road,Haidian District, Beijing 8, 100048, CN)
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