Analysis of Selective Resinite Flotation from Wasatch Plateau Coal by pH Control
作者:
J. D. MILLER,
QIANG YU,
K. BUKKA,
YI YE,
期刊:
Coal Preparation
(Taylor Available online 1993)
卷期:
Volume 13,
issue 1-2
页码: 31-51
ISSN:0734-9343
年代: 1993
DOI:10.1080/07349349308905120
出版商: Taylor & Francis Group
关键词: pH;Flotation;Resinite;Coal;Surface Hydrophobicity;Precipitation
数据来源: Taylor
摘要:
It has been found that selective resinite flotation from Wasatch Plateau coal can be achieved at high pH. For example, a high grade resin concentrate (>70% resin) was obtained at an excellent recovery (>90%) by single-stage flotation above pH 12 from a feed containing only 7.2% resin. This rougher concentrate was then cleaned to produce a cleaner concentrate containing >90% resin. The flotation results thus obtained by pH control can be explained to be due to: (1) improved dispersion of the resinite/coal suspension as evidenced by microscopic observation, electrokinetic behavior, and sedimentation phenomena: and (2) improved depression of coal particles; their hydrophilic state being stabilized by surface precipitation and/or adsorption of calcium species at higher pH values as determined by FTIR and XPS spectroscopic analysis.
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