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

Xie, Weining, He, Yaqun, Luo, Cheng, Zhang, Xia, Li, Hong, Yu, Jiadong, Wang, Haifeng and Shi, Feng N. (2015) Comparison of float-sink and progressive release flotation of ground products of coal middlings.. Physiochemical Problems of Mineral Processing, 51 2: 675-684. doi:10.5277/ppmp150225

Author Xie, Weining
He, Yaqun
Luo, Cheng
Zhang, Xia
Li, Hong
Yu, Jiadong
Wang, Haifeng
Shi, Feng N.
Title Comparison of float-sink and progressive release flotation of ground products of coal middlings.
Journal name Physiochemical Problems of Mineral Processing
ISSN 1643-1049
Publication date 2015-01-01
Sub-type Article (original research)
DOI 10.5277/ppmp150225
Volume 51
Issue 2
Start page 675
End page 684
Total pages 10
Place of publication Wroclaw, Poland
Publisher Politechnika Wroclawska * Oficyna Wydawnicza / Wroclaw University of Technology
Language eng
Abstract 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.
Keyword Coal middlings
Progressive release flotation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Julius Kruttschnitt Mineral Research Centre Publications
Official 2016 Collection
Sustainable Minerals Institute Publications
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Created: Tue, 28 Apr 2015, 19:38:09 EST by Karen Holtham on behalf of Julius Kruttschnitt Mineral Research Centre