Japanese Patent JPS5436160

B2

In a process for extracting alumina from alumina-containing ores on a two-stream system by individually preheating a slurry of alumina-containing ores and an aqueous alkali solution each in preheaters of indirectly heating, mixing the preheated slurry with the preheated aqueous alkali solution, and extracting alumina from the ores in a digester of either the heating type involving the direct injection of live steam or the heat-insulated type, the alumina is extracted from the ores by preparing the slurry of alumina-containing ores with water or a diluted aqueous alkali solution, such as from the drain obtained by recovering steam from an evaporator for cooling the slurry resulting from extraction, and utilizing the recovered steam in preheating the slurry of the alumina-containing ores or decomposition solution or both, preheating the slurry of alumina-containing ores, and mixing the preheated slurry with an aqueous alkali solution preheated as another stream as the decomposition solution. Scale formation can be prevented completely or substantially on an inside surface of the preheater for the slurry of alumina-containing ores.

WO/2003/078055	CONTINUOUS PROCESS AND APPARATUS FOR THE EFFICIENT CONVERSION OF INORGANIC SOLID PARTICLES
WO/2005/123591	IMPROVEMENT TO THE BAYER PROCESS FOR THE PRODUCTION OF ALUMINA TRIHYDRATE BY MEANS OF ALKALINE LEACHING OF BAUXITE, SAID METHOD COMPRISING A PREDESILICIFICATION STEP

JP9428076A

November 07, 1979

August 06, 1976

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C01F7/062

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