Regeneration of sulfided dolomite

Details Regeneration of sulfided dolomite Regeneration of sulfided dolomite

C - Chemistry, Metallurgy

01

B

23/348, 252/36

C01B 17/60 (2006.01) B01D 53/48 (2006.01) C01F 5/06 (2006.01) C10K 1/26 (2006.01)

Patent

CA 1071614

ABSTRACT Calcined dolomite which has been used to remove sulfur and/or sulfur-containing compounds from gases by chemical reactions therewith is regenerated by passing through the spent sulfided dolomite an oxidizing gas consisting of steam and CO2 in a volume ratio of about 5:1 to 1:5 and about 0.5% to about 20% oxygen at a temperature in the range of about 1500°F up to the temperature at which the crystalline structure of the dolomite becomes permanently altered thereby rendering a major portion of the dolomite inaccessible to the reacting gases. By this method the dolomit is returned to a condition suitable for reuse as a hot-gas desulfurizing agent, and sulfuric acid or elemental sulfur can be recovered.

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