Magnetic separation of iron pyrite from coal

Details Magnetic separation of iron pyrite from coal Magnetic separation of iron pyrite from coal

1977-01-28

1979-06-12

Halper, Robert

Classifying, separating, and assorting solids

Magnetic

Paramagnetic

209227, B03C 110

Patent

active

041579534

ABSTRACT:
A high gradient magnetic separator particularly for the desulfurization of coal. The process and apparatus are continuous and suitable for high volumes of material in a fluid stream. They employ the concept of a high gradient magnetic field through a stream of material that has some portion of magnetic particles which are to be separated. Within the separator is a matrix of magnetizable material, such as stainless steel wool. A magnetic field is formed of a series of magnetic coils surrounding the stream of material from the inlet to an outlet. Each of the coils are magnetized and then demagnetized in sequence so as to drop or release magnetic particles from the steel wool to the fluid stream as it flows through the separator.
As the magnetic particles concentrate they are flushed out through a diverter valve for a short moment and the process continues. Passage of the stream of material is continuous for all practical purposes. During all other portions of the cycle the field is turned on and the magnetic particles attach to the matrix until the next cycle of demagnetization when they go into the fluid stream (gas or slurry) and concentrate and pass through the diverter valve. The main stream of material is thus cleared of magnetic particles. The frequency of the sequential flushing would be dependent upon the concentration of the magnetic particles in the stream of materials. In any event the demagnetization would be sequenced with speed of the fluid stream.

REFERENCES:
patent: 1425235 (1922-08-01), Bradley
patent: 3294237 (1966-12-01), Weston
patent: 3567026 (1971-03-01), Kolm
patent: 3822016 (1974-07-01), Jones
patent: 3887457 (1975-06-01), Marston
patent: 3994801 (1976-11-01), Colburn

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