Process for the production of aluminate lye from agglomerate containing alkali metal aluminates

摘要

The invention relates to process engineering involving the extraction of useful components from solids into solution. The invention is based on the leaching of the agglomerate (1) with a recycled lye (2) from the production of alumina and a weak alkali lye (3), to obtain a suspension (4), whose liquid phase represents the aluminate lye (5). The process also comprises multistage washing of the solid phase (6) of the suspension (4) in countercurrent, obtaining a wash water (9) at every stage of the wash (C1, C2, ..., Cn), and also obtaining, in the first stage (C1), a weak alkali lye (3), and in the last stage (Cn), the leached sludge (10). The quantities of the materials introduced into the leaching process are set as follows: agglomerate (1) - proportional to the sum of the mass flow of the recycled lye (2) and of the weak alkali lye (3); recycled lye (2) - proportional to the mass flow of the weak aqueous alkali metal hydroxide (3); weak alkali lye (3) - proportional to the content of caustic soda in the leached sludge (10). The sum of the volumes of the solid phase (6) of the suspension (4), and of the wash water (9) is kept constant either by changing the mass flow of the wash water (9), which is supplied to the stage in question of the wash, or, in the last stage (Cn), by changing the amount of the water (7) which is supplied to the wash process. The concentration of the caustic soda in the aluminate lye (5), the alkaline ratio of the aluminate lye ... Original abstract incomplete. <IMAGE>