Application of high field and high gradient methods to the magnetic separation of mineral matter from micronized coal
In exploratory laboratory measurements, high field high gradient magnetic separation (HGMS) has removed as much as 74% of the mineral matter and 99% of the pyritic sulfur from micronized coals with mineral contents up to 16.39 wt%. Magnetic cleaning methods are limited by the fact that not all mineral matter in coal is magnetic. HGMS methods are further restricted when mineral matter levels generally exceed about 2 to 3% because of excessive capture-matrix loading which leads to poor clean coal weight yields. The use of selective flocculation of coal mineral matter and processing at high flow velocities (made possible with the use of high field superconductive magnet technology) offer hope for overcoming these process limitations and for extending use of HGMS technology to preparation of low ash and low sulfur coal-slurry fuels. Measurements of mineral matter and sulfur removals achieved in high field HGMS processing of water slurries of dispersed micronized coals are presented. Field strengths up to 15 Tesla, flow velocities up to 3 cm/s, and slurry solids up to 38.4% were investigated. The use of models of the magnetic capture mechanism for scaling laboratory data to commercial applications is discussed. 15 references, 9 figures, 8 tables.
- Research Organization:
- Exportech Co., Inc., Export, PA
- DOE Contract Number:
- AC01-83ER80037
- OSTI ID:
- 5508356
- Report Number(s):
- CONF-840415-
- Journal Information:
- Sep. Sci. Technol.; (United States), Journal Name: Sep. Sci. Technol.; (United States) Vol. 19:11-12; ISSN SSTED
- Country of Publication:
- United States
- Language:
- English
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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ASHES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CLEANING
COAL
COAL PREPARATION
CONCENTRATORS
DATA
DISPERSIONS
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
ELEMENTS
ENERGY SOURCES
EQUIPMENT
EXPERIMENTAL DATA
FEASIBILITY STUDIES
FLOTATION
FLOW RATE
FOSSIL FUELS
FUELS
HYDROGEN COMPOUNDS
INFORMATION
IRON COMPOUNDS
IRON SULFIDES
MAGNETIC FIELDS
MAGNETIC FLUX
MAGNETIC PROPERTIES
MAGNETIC SEPARATORS
MAGNETIC SUSCEPTIBILITY
MAGNETS
MATERIALS
MATHEMATICAL MODELS
MINERALS
MIXTURES
NONMETALS
NUMERICAL DATA
OXYGEN COMPOUNDS
PERFORMANCE TESTING
PHYSICAL PROPERTIES
PYRITE
RESIDUES
SCALING LAWS
SEPARATION PROCESSES
SLURRIES
SULFIDE MINERALS
SULFIDES
SULFUR
SULFUR COMPOUNDS
SULFUR CONTENT
SUPERCONDUCTING DEVICES
SUPERCONDUCTING MAGNETS
SUSPENSIONS
TESTING
TRANSITION ELEMENT COMPOUNDS
VELOCITY
VISCOSITY
WATER