Heavy medium recovery in coal washing by continuous high gradient magnetic separation. Final report

Technical Report · Thu Sep 01 04:00:00 EDT 1983

OSTI ID:6200345

Kelland, D R

We have adapted high grade magnetic separation (HGMS) for magnetite recovery because of its insensitivity to coal/magnetite ratio and slurry density and its ability to capture fine magnetite at high velocity. An open vertical matrix able to capture 10 ..mu..m (avg. size) magnetite without entraining 2 mm coal has been incorporated in a 1.85 m diameter continuous high gradient magnetic separator. Three-quarter ton samples of magnetite (in 1000 gallons of water) have been recovered with the matrix ring turning at 40 cm/s through a field of 6 kOe. A laminated core demagnetizing coil followed by water sprays removes the recovered magnetite. The recovery is high, particularly for two passes which could be accomplished by two magnet heads on a single carousel ring. Coal entrainment is low for a wide range of operating conditions. A 4.8 m diameter separator, the largest currently available, with multiple heads, should be able to treat 350 tons of magnetite and coal per hour. 29 references, 52 figures, 13 tables.

• Research Organization: Massachusetts Inst. of Tech., Cambridge (USA). Francis Bitter National Magnet Lab.
• DOE Contract Number: AT01-76ET13014
• OSTI ID: 6200345
• Report Number(s): DOE/ET/13014-T1; ON: DE85005606
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
013000* -- Coal
Lignite
& Peat-- Transport
Handling
& Storage
CARBONACEOUS MATERIALS
CHALCOGENIDES
CLEANING
COAL
COAL FINES
COAL PREPARATION
CONCENTRATORS
DATA
DISPERSIONS
ENERGY SOURCES
EXPERIMENTAL DATA
FOSSIL FUELS
FUEL SLURRIES
FUELS
HEAVY MEDIA SEPARATION
INFORMATION
IRON COMPOUNDS
IRON ORES
IRON OXIDES
MAGNETIC SEPARATORS
MAGNETITE
MATERIALS
MINERALS
MIXTURES
NUMERICAL DATA
ORES
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
RECOVERY
SEPARATION PROCESSES
SLURRIES
SUSPENSIONS
TRANSITION ELEMENT COMPOUNDS
WASHING