Abstract: A process for the recovery of soluble alumina values from alumina-bearing ores comprising simultaneously contacting a stream containing an effective amount of a reducing agent such as SO.sub.2 and a stream containing an effective amount of an oxidizing agent such as Cl.sub.2 with an aqueous slurry of the alumina-bearing ores for a time sufficient to remove at least about 50 weight percent of the soluble alumina values from said ores is disclosed.

Abstract: Apparatus for making ethylene dichloride by reacting ethylene and chlorine in liquid reaction medium includes a reaction zone having gas inlets for the ethylene and chlorine at the lower portion thereof, the reaction zone being connected by conduits to externally located indirect heat exchange means so as to provide a path for continuous circulation of the liquid reaction medium through the reaction zone and the heat exchange means caused by thermosyphon effect generated by heat of reaction and/or the gas-lift effect induced by the introduction of the reactants. The reaction zone has a vapor outlet at the upper portion thereof in communication with condenser means for condensing vaporous ethylene dichloride product to recover liquid ethylene dichloride.