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- Title
FLOTATION BEHAVIOR OF HARD-TO-SEPARATE AND HIGH-ASH FINE COAL.
- Authors
Yaowen XING; Xiahui GUI; Yijun CAO; Yi ZHANG; Shulei LI; Jiongtian LIU
- Abstract
The flotation behavior of hard-to-separate and high-ash fine coal was investigated using conventional flotation with constant power input. A new flotation process, based on energy input and distribution, was designed to lower the ash content of concentrate. The results obtained using Fourier transform infrared (FTIR) analysis show that the coal samples have good floatability because of many hydrophobic and few hydrophilic functional groups. Under a constant power input, a large number of ashforming materials floated into a froth product at the start of flotation. Based on the Fuerstenau upgrading curves, it was determined that the 0.25-0.074 mm size fraction range showed the worst selectivity when compared with 0.50-0.25 mm and -0.074 mm size fractions. The desired concentrate with an ash content of 13.98%, 27.59% of ash recovery, and 80.01% combustible matter recovery could be obtained by transferring the excess energy of the flotation-conditioning stage to the pre-conditioning stage and increasing the power input step-by-step in the flotation-conditioning stage at equal total energy consumption.
- Subjects
FLOTATION; MINERAL inclusions in coal; FOURIER transform infrared spectroscopy; HYDROPHOBIC compounds; HYDROPHILIC compounds
- Publication
Physicochemical Problems of Mineral Processing, 2016, Vol 52, Issue 2, p703
- ISSN
1643-1049
- Publication type
Article
- DOI
10.5277/ppmp160215