Patent ID: 6337058
Filing Date: 2002-01-08
Classification: C01B,C01F,C22B

Abstract:
A process for producing calcium sulfide and calcium oxide comprising the steps of:providing a container housing having two drums, said drums each having a horizontal longitudinal center axis, said drums being connected by a passageway therebetween, wherein each of said drums contains a screw conveyor that extends continuously for the full length of the respective drum, said screw conveyor being generally parallel to the respective said horizontal center axis of said respective drum; providing an inlet passage for passing material into said drums; providing an outlet passage for passing material out of said drums; providing indirect heat to said materials within said drums; passing reactants comprising (i) a source of calcium sulfate and (ii) a source of carbon selected from the group consisting of charcoal, coal, and carbon into the first one of said two drums; supplying heat to said reactants in said first one of said two drums to dehydrate said reactants; passing said reactants to a second one of said two drums and maintaining the temperature of the atmosphere exterior to said second one of said two drums between 1800 and 2000Â° F.; converting said reactants to CaS and CaO within said second one of said two drums; moving said reactants and said products with said screw conveyors contained within said two drums; and passing said products out of said drums and said container, said product comprising calcium sulfide and calcium oxide.