Surfactant-enhanced electroosmotic dewatering of mineral ultrafines

Journal Article · Tue Jan 01 00:00:00 EST 1991 · Separation Science and Technology; (United States)

DOI:https://doi.org/10.1080/01496399108050496· OSTI ID:5454619

Grant, C S; Matteson, M J; Clayfield, E J ^[1]

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1. Georgia Inst. of Tech., Atlanta (USA)

The rate and extent of electroosmotic dewatering of mineral ultrafines are dependent on the surface charge density which is quantitatively measured by the zeta potential. This research tailors the surface electrical properties of a naturally uncharged ochre (iron oxide) mineral slurry by altering the concentration of potential determining hydroxide ions to facilitate electroosmotic dewatering. The adsorption of hydroxide ions (9 {times} 10{sup {minus}4} to 9 {times} 10{sup {minus}3} M) onto the iron oxide surface provides the necessary increase in zeta potential; however, the resulting electrostatic dispersion of the particles severely limits the hydraulic permeability. Subsequent addition of cetyl trimethyl ammonium bromide (5 {times} 10{sup {minus}4} to 5 {times} 10{sup {minus}3} M), a cationic surfactant, reflocculates the particles, while maintaining sufficient zeta potential to generate an electroosmotic effect. Hydraulic performance of the treated slurries is characterized by measurement of flow rate data and specific resistance determination. Further characterization of the electrokinetic properties through electrophoretic mobility studies verifies the proposed adsorption mechanism.

• OSTI ID: 5454619
• Journal Information: Separation Science and Technology; (United States), Vol. 26:6; ISSN 0149-6395
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
MINERALS
WATER REMOVAL
TAILINGS
ADDITIVES
ADSORPTION
AMMONIUM HALIDES
BROMIDES
COAL
EFFICIENCY
ELECTRICAL PROPERTIES
ELECTROPHORESIS
ELECTROSTATICS
EXPERIMENTAL DATA
FILTRATION
FLOCCULATION
FLOW RATE
HYDRAULIC CONDUCTIVITY
IRON OXIDES
KINETICS
MOISTURE
OPTIMIZATION
OSMOSIS
PARTICLE SIZE
PERMEABILITY
PRESSURE DROP
SLURRIES
SODIUM HYDROXIDES
SURFACE POTENTIAL
SURFACE PROPERTIES
SURFACTANTS
SYNERGISM
TIME DEPENDENCE
VOID FRACTION
WASTE PROCESSING
ALKALI METAL COMPOUNDS
AMMONIUM COMPOUNDS
BROMINE COMPOUNDS
CARBONACEOUS MATERIALS
CHALCOGENIDES
DATA
DIFFUSION
DISPERSIONS
ENERGY SOURCES
FOSSIL FUELS
FUELS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
HYDROXIDES
INFORMATION
IRON COMPOUNDS
MANAGEMENT
MATERIALS
MIXTURES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POTENTIALS
PRECIPITATION
PROCESSING
REMOVAL
SEPARATION PROCESSES
SIZE
SODIUM COMPOUNDS
SOLID WASTES
SORPTION
SUSPENSIONS
TRANSITION ELEMENT COMPOUNDS
WASTE MANAGEMENT
WASTES
010300* - Coal
Lignite
& Peat- Preparation- (1987-)
010800 - Coal
Lignite
& Peat- Waste Management