Abstract: Methods and apparatus for processing and cooling a hot gaseous stream exiting a gasification reactor vessel at temperatures in excess of 1300° C. where the gas will come into contact with a corrosive aqueous liquid, including methods and apparatus for cooling the gaseous stream prior to quenching the gaseous stream as well as methods and apparatus for providing vessel construction able to provide for the contact of a hot gaseous stream at temperatures in excess of 1100° C. with a corrosive aqueous liquid.

Abstract: A spinel containing slip-casting composition, a method for preparing the spinel slip-casting composition and a method for casting the slip into usable forms are described. The spinel employed to prepare the castable slips is a pre-calcined spinel prepared in the manner of copending application Ser. No. 184,189, filed Sept. 4, 1980, which is ball-milled with water, then mixed with a deflocculant at pH 9 or below and optionally with a molding aid. The slurry or "slip" is cast into a mold porous to water until the desired thickness of solid has been obtained and the excess "slip" decanted or otherwise withdrawn from the mold i.e., drain cast method or the "slip" is solid cast and dried to produce a green solid casting. The green shape is retained in the mold until it gains green strength, 1 hour to 5 days, and thereafter placed in an oven wherein it is fired to above about 1400.degree. C. for from 1 to 20 hours until it has reached its maximum density of between about 55 and 99 percent of theoretical.