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Mechanisms for selective coalescence of coals: Fossil energy quarterly report, January 1--March 31, 1988

Technical Report ·
OSTI ID:6642259
; ; ; ; ; ;
Coal, pyrite, and graphite particles were agglomerated individually with heptane to obtain a more complete picture of the interacting effects of several parameters on particle recovery. The parameters included particle hydrophobicity, heptane dosage, and the ionic strength of the suspending medium. The relative hydrophobicity of the different solids was determined by measuring the induction time, or time required for attachment of one or more particles to a small gas bubble when brought into contact with it. Increasing the ionic strength of the suspending medium increased both the apparent hydrophobicity and recovery of highly hydrophobic coals and graphite, whereas it decreased both the hydrophobicity and recovery of weakly hydrophobic materials. The hydrophobicity of various materials was also evaluated by measuring the heat of immersion of the materials in water and sodium chloride solutions with a microcalorimeter. Results seemed to correlate with both oil agglomeration recovery and induction time measurements. The application of various pyrite depressants such as Ca(OH)/sub 2/ or the salts of magnesium, copper, and aluminum to the cleaning of Upper Freeport coal by oil agglomeration showed that both the sulfur and ash contents of the coal were reduced significantly by the depressants. Results indicated that the successful application of such depressants will depend on several critical factors including the type of coal, depressant concentration, pH, oil dosage, and coal particle size. 4 refs., 16 figs., 3 tabs.
Research Organization:
Ames Lab., IA (USA)
DOE Contract Number:
W-7405-ENG-82
OSTI ID:
6642259
Report Number(s):
IS-4965; ON: DE89003761
Country of Publication:
United States
Language:
English

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Related Subjects

01 COAL, LIGNITE, AND PEAT
010300* -- Coal
Lignite
& Peat-- Preparation-- (1987-)
010600 -- Coal
Lignite
& Peat-- Properties & Composition
ADDITIVES
ADSORPTION
AGGLOMERATION
ALKALINE EARTH METAL COMPOUNDS
ALKANES
ALUMINIUM COMPOUNDS
ALUMINIUM NITRATES
ASH CONTENT
CALCIUM COMPOUNDS
CALCIUM HYDROXIDES
CARBON
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL PROPERTIES
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CLEANING
COAL
COALESCENCE
COPPER CHLORIDES
COPPER COMPOUNDS
COPPER HALIDES
DOCUMENT TYPES
ELEMENTAL MINERALS
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
GRAPHITE
HALIDES
HALOGEN COMPOUNDS
HEPTANE
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROXIDES
IRON COMPOUNDS
IRON SULFIDES
MAGNESIUM CHLORIDES
MAGNESIUM COMPOUNDS
MATERIALS
MEASURING METHODS
MINERALS
NITRATES
NITROGEN COMPOUNDS
NONMETALS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PARTICLES
PH VALUE
PROGRESS REPORT
PYRITE
SORPTION
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
SULFUR CONTENT
SURFACE PROPERTIES
TRANSITION ELEMENT COMPOUNDS