Chemistry of inorganic compounds – Sulfur or compound thereof – Oxygen containing
Patent
1989-12-13
1991-11-19
McFarlane, Anthony
Chemistry of inorganic compounds
Sulfur or compound thereof
Oxygen containing
423168, 423171, 423178, 423555, 423539, C01B 1750
Patent
active
050664743
ABSTRACT:
A method for production of sulfur dioxide from calcium sulfate by high temperature thermal reduction. Calcium sulfate, preferably in the form of calcined phosphogypsum, is desulfurized using a fossil fuel as a heat source, the combustion products resulting therefrom being used as a reductant. The fuel and reductant may be coal, coke, liquid hydrocarbons or natural gas; high sulfur, medium or low rank coal is preferred. The fuel is combusted with air or oxygen-enriched air. The solid feeds are introduced as finely-divided particles entrained in reactant gases, and the temperature is sufficiently hot to cause residual processed materials to melt and drain from the reaction vessel in the form of a liquid slag, yet not hot enough to produce significant amounts of fine silicon oxide dust. Iron pyrite, sand and/or clay can be added to reduce the slag melting point and to control its viscosity.
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McFarlane Anthony
Science Ventures Inc.
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