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), Vol. 19:11-12; Conference: 187. national meeting of the American Chemical Society, St. Louis, MO, USA, 8 Apr 1984
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COAL
CLEANING
FLOTATION
COAL PREPARATION
SCALING LAWS
MINERALS
MAGNETIC SUSCEPTIBILITY
SEPARATION PROCESSES
PYRITE
SULFUR
SUPERCONDUCTING MAGNETS
FEASIBILITY STUDIES
ASHES
EXPERIMENTAL DATA
FLOW RATE
MAGNETIC FIELDS
MAGNETIC FLUX
MAGNETIC SEPARATORS
MATHEMATICAL MODELS
PERFORMANCE TESTING
SLURRIES
SULFUR CONTENT
VELOCITY
VISCOSITY
WATER
CARBONACEOUS MATERIALS
CHALCOGENIDES
CONCENTRATORS
DATA
DISPERSIONS
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
ELEMENTS
ENERGY SOURCES
EQUIPMENT
FOSSIL FUELS
FUELS
HYDROGEN COMPOUNDS
INFORMATION
IRON COMPOUNDS
IRON SULFIDES
MAGNETIC PROPERTIES
MAGNETS
MATERIALS
MIXTURES
NONMETALS
NUMERICAL DATA
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RESIDUES
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
SUPERCONDUCTING DEVICES
SUSPENSIONS
TESTING
TRANSITION ELEMENT COMPOUNDS
010402* - Coal
Lignite
& Peat- Purification & Upgrading
013000 - Coal
Lignite
& Peat- Transport
Handling
& Storage
010600 - Coal
Lignite
& Peat- Properties & Composition
420201 - Engineering- Cryogenic Equipment & Devices