Effect of Humic Substances on the Flotation Response of Coal
| Autor: | Ralph W. Lai, Joseph M. Okoh, Wu-Wey Wen |
|---|---|
| Rok vydání: | 1989 |
| Předmět: |
Ozone
Aqueous solution business.industry Inorganic chemistry Fossil fuel technology industry and agriculture respiratory system Geotechnical Engineering and Engineering Geology complex mixtures Chemical reaction Decomposition respiratory tract diseases chemistry.chemical_compound Fuel Technology Adsorption chemistry otorhinolaryngologic diseases Coal business Energy source |
| Zdroj: | Coal Preparation. 7:69-83 |
| ISSN: | 1545-5831 0734-9343 |
| DOI: | 10.1080/07349348908960543 |
| Popis: | 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 a 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 reponses 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 flotability 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 ... |
| Databáze: | OpenAIRE |
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