The leaching of aluminium in spanish clays,coal mining wastes and coal fly ashes by sulphuric acid

摘要

The acid leaching of aluminium from several non tradivtional ores,bayerite,kaolinite,different clays,coal mining wastes and coal fly ashes,and the kinetic of their dissolution are described.The effects of time,temperature,acid concentration,sample calcination,particle size were examined.The leaching of aluminium is dependent on acid concentration and strongly on temperature.Generally,the time to reach a fixed percentage of dissolution decreases with increasing acid concentration in the range 6