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Effect of humic substances on the flotation response of coal

Journal Article · · Coal Preparation (Gordon and Breach); (USA)
;  [1];  [2]
  1. Pittsburgh Energy Technology Center, U.S. Dept. of Energy, Pittsburgh, PA (US)
  2. Dept. of Natural Science, Univ. of Maryland, MD (US)
+ Show Author Affiliations

This study investigated the generation of humic substances from the coal and the coal surface, and evaluated the effect of humic substances on the surface property of coal. The humic substances in aqueous solution were readily adsorbed on the surface of fresh coal. The adsorption affects the surface hydrophobicity of the coal and, hence, the flotation recovery of coal. The adsorption of humic substances is maximum at neutral pH and diminishes toward both the alkaline pH and the acid pH. This effect is reflected in the flotation responses of the fresh coal. Solutions of humic substances were oxidized with oxygen gas and ozone. The oxidation of humic substances in solution resulted in an adsorption that greatly enhanced the hydrophilicity of the coal and thus impaired the floatability of the coal. On the other hand, the ozonation of humic substances in solution resulted in the decomposition of humic substances and an improvement in the flotation response of the coal. Direct oxidation and ozonation of coal surface decreased the hydrophobicity of the coal, which resulted in a decrease in the flotation response.

OSTI ID:
7019661
Journal Information:
Coal Preparation (Gordon and Breach); (USA), Journal Name: Coal Preparation (Gordon and Breach); (USA) Vol. 7:1; ISSN 0734-9343; ISSN COAPD
Country of Publication:
United States
Language:
English

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Related Subjects

01 COAL, LIGNITE, AND PEAT
010300* -- Coal
Lignite
& Peat-- Preparation-- (1987-)
010402 -- Coal
Lignite
& Peat-- Purification & Upgrading
ADSORPTION
AQUEOUS SOLUTIONS
CARBONACEOUS MATERIALS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COAL
DISPERSIONS
ENERGY SOURCES
FLOTATION
FOSSIL FUELS
FUELS
HUMIC ACIDS
KINETICS
MATERIALS
MIXTURES
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDATION
PH VALUE
REACTION KINETICS
SEPARATION PROCESSES
SOLUTIONS
SORPTION