Converting calcium sulphide to calcium oxide

Details Converting calcium sulphide to calcium oxide Converting calcium sulphide to calcium oxide

1978-10-17

1980-08-05

Vertiz, O. R.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

C01F 1110

Patent

active

042161975

ABSTRACT:
CaS is converted to CaO with increased production of SO.sub.2 and decreased production of CaSO.sub.4 by passing CaS-containing particles into one region of a conversion bed wherein they are fluidized at an elevated temperature by an upwardly-passing oxygen-containing fluidizing gas, removing particles of increased CaO content from a second region of the bed, and providing a reducing agent (e.g. a hydrocarbon gas, liquid or carbonaceous solid) in the bed between the first and second regions, preferably nearer the latter, to produce a mildly reducing atmosphere which reduces any CaSO.sub.4 and increases the yield of SO.sub.2. The removed particles may be circulated to a fluidized gasification bed wherein a sulphur-containing fuel is converted to substantially sulphur-free fuel gas and wherein the sulphur is fixed as CaS in the particles, which particles are thereafter recirculated to the conversion bed.

REFERENCES:
patent: 3582276 (1971-06-01), Campbell et al.
patent: 3807090 (1974-04-01), Moss
patent: 4102989 (1978-07-01), Wheelock

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