NDLI: Magnetite-coal separation by continuous HGMS

Content Provider	IEEE Xplore Digital Library
Author	Dobby, G. Kelland, D.
Copyright Year	1965
Abstract	Magnetite, slurried in water, is used to create an apparent heavy medium in which fine coal (0.1 to 2.4 mm) is cleaned of its mineral impurities. The magnetite is much finer in size (1 to 44 μm) than the coal and is usually recovered from the coal and refuse by magnetic drum separators. Their performance suffers from changes in feed conditions and a number of them are needed for the average coal cleaning plant. We have adapted 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 μm (avg. size) magnetite without entraining 2 mm coal has been incorporated in a 1.85 m diameter continuous 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. In preparation for this continuous program, tests of slurry densities from 20 to 35% solids and coal/magnetite ratios'from 3:1 to 1:4 showed almost no variation in recovery or entrainment. 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.
Sponsorship	IEEE Magnetics Society
Starting Page	1698
Ending Page	1700
Page Count	3
File Size	800027
File Format	PDF
ISSN	00189464
Volume Number	18
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1982-11-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic separation Particle separators Slurries Minerals Impurities Waste materials Feeds Cleaning Turning Magnetic cores
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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