process for the production of sulphur dioxide and ammonia

摘要

A mixt. of (NH4)2SO4 and a granular solid is passed (downwards) in counter-current to a reducing gas, so that the temp. of the mixt. rises from 200 (100-200) degrees C to 400 (500-1500) degrees C in the direction of flow. The solid can be an inert material; a bed of coal or coke, from which the reducing gas is obtd. by partial combustion of this material at the end of the bed; a metalliferous ore; or sand.