PED: Pressurized electroosmotic dewatering

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5929689

Heath, L W

The strength of electroosmosis is in its independence of pore size, whereas pressure removes the free water from the larger pores rapidly and causes consolidation to occur. Electroosmosis has no intergranular effects, so consolidation is beneficial to the electroosmotic process in that the pores remain saturated for a longer time, menisci do not form and an induced hydraulic gradient opposing the electroosmotic gradient is not established as soon. The experimental program investigated the optimization of pressurized electroosmotic dewatering (PED) of ultra-fine coal suspensions. The slurry characteristics of greatest interest were the particle size distribution and zeta potential. The particle size distribution controls the maximum packing density and thus, the lowest pore volume, obtainable. A reduction in pore volume increases the degree of saturation for a given quantity of water. The zeta potential of a suspension directly governs the electroosmotic flow rate. A computerized data acquisition system was built to monitor the PED tests. This enhanced the research by allowing more test data to be obtained in a short time and more testing to be completed because of the reduced test analysis time. Also, other suspended materials such as kaolinite slurries, lignite slurries, phosphate slimes, red mud, fly ash scrubber slimes and diamond slimes were tested using PED.The test results provide a basis for pilot-scale testing of PED in a continuous manner. A pilot-scale study will provide process algorithms for economic commercial applications of PED and incorporate full-scale equipment constraints.

• Research Organization: Iowa State Univ. of Science and Technology, Ames (USA)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 5929689
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800* -- Coal
Lignite
& Peat-- Waste Management
013000 -- Coal
Lignite
& Peat-- Transport
Handling
& Storage
AEROSOL WASTES
ALUMINIUM COMPOUNDS
ALUMINIUM SILICATES
ASHES
BROWN COAL
CARBONACEOUS MATERIALS
COAL
COAL FINES
COAL PREPARATION
COMPUTERIZED CONTROL SYSTEMS
CONCENTRATORS
CONTROL SYSTEMS
CRYSTAL STRUCTURE
DATA ACQUISITION SYSTEMS
DEWATERING EQUIPMENT
DIFFUSION
DISPERSIONS
ENERGY SOURCES
FLY ASH
FOSSIL FUELS
FUELS
KAOLINITE
LIGNITE
MATERIALS
MICROSTRUCTURE
MINERALS
MIXTURES
OSMOSIS
OXYGEN COMPOUNDS
PARTICLE SIZE
POROSITY
POTENTIALS
PRESSURIZING
REMOVAL
RESIDUES
SEPARATION PROCESSES
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
SIZE
SLUDGES
SLURRIES
SURFACE POTENTIAL
SUSPENSIONS
WASTES
WATER REMOVAL