Magnetic desulfurization of airborne pulverized coal

Details Magnetic desulfurization of airborne pulverized coal Magnetic desulfurization of airborne pulverized coal

1976-07-09

1977-10-04

Dees, Carl F.

Fuel and related compositions

Liquid fuels

Aluminum or heavy metal, other than lead, containing

201 17, C10L 910, C10B 5700

Patent

active

040521702

ABSTRACT:
A process for removing pyrite particles from coal by pulverizing and fluidizing a coal in the presence of (a) heated air, followed by removing pyrite particles with a high-gradient magnetic separator; or (b) a hot, inert gas from which condensables are separated, followed by countercurrently further heating the coal in a succession of fluidized stages with hot oxygen-containing gas to a temperature at which the pyrite particles are sufficiently converted to pyrrhotite, magnetite, and gamma-hematite to raise the average magnetic susceptibility to at least 2 .times. 10.sup.6, and removing the pyrite minerals by magnetic separation means. The beneficiated coal or semicoke particles are fed with heated air and evolve volatile matter to the combustion zone of a furnace.

REFERENCES:
patent: 3463310 (1969-08-01), Ergun et al.
patent: 3725241 (1973-04-01), Chervenak
patent: 3736233 (1973-05-01), Sass et al.

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