Electrokinetic study on the oil flotation of oxidized coal. [Separation from ash materials and pyrite]

Conference · Thu Jan 01 04:00:00 EST 1981 · Sep. Sci. Technol.; (United States)

OSTI ID:5952205

Wen, W W ^[1]; Sun, S C

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1. Pittsburgh Mining Technology Center, PA

The objective of this investigation was to study the electrokinetic behavior of oxidized coals and of hydrocarbon emulsion droplets of flotation reagents to indicate the feasibility of separating the oxidized coals from ash materials and pyrite by an oil flotation process. The effects of surfactants and hydrolyzed metal ions were also included. The electrokinetic behavior of the oxidized coals and the hydrocarbon emulsion droplets were studied by an electrophoresis technique. Generally the isoelectric point (IEP) of the coals decreased with increasing degree of oxidation. A model of selective flotation of oxidized coal is postulated on the basis of the electrokinetic results. This model simply states that in the presence of a suitable amount of collector and frother, the optimal selective flotation of oxidized coal will occur at the IEP of the oxidized coal. To achieve this condition at the coal surface, it is necessary to adsorb heavy metal hydroxide ions prior to flotation and to absorb hydrocarbon oil droplets containing positively charged organic functional groups during flotation. Oxidized coal becomes more hydrophobic at its IEP because most of its surface is relatively non-polarizable surfaces and remain in suspension even when they are at an IEP. 14 figures.

• OSTI ID: 5952205
• Report Number(s): CONF-810520-
• Conference Information: Journal Name: Sep. Sci. Technol.; (United States) Journal Volume: 16:10
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600 -- Coal
Lignite
& Peat-- Properties & Composition
013000* -- Coal
Lignite
& Peat-- Transport
Handling
& Storage
ASHES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL
COAL PREPARATION
COLLOIDS
COMMINUTION
DISPERSIONS
DROPLETS
ELECTRODYNAMICS
ELECTROPHORESIS
ELEMENTS
EMULSIONS
ENERGY SOURCES
FLOTATION
FOSSIL FUELS
FUELS
IRON COMPOUNDS
IRON SULFIDES
MATERIALS
METALS
MINERALS
OXIDATION
PARTICLES
PETROLEUM
PYRITE
RESIDUES
SEPARATION PROCESSES
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
SURFACTANTS
TRANSITION ELEMENT COMPOUNDS