Method for the production of alumina

Details Method for the production of alumina Method for the production of alumina

C - Chemistry, Metallurgy

01

F

23/247

C01F 7/02 (2006.01)

Patent

CA 1120236

Abstract of the Disclosure The method resides in mixing alumina-containing raw material comminuted in a soda solution to obtain a frac- tion of more than 0.08 mm in an amount of more than 12 per- cent by weight with carbonate raw material and a soda solu- tion in a weight ratio which ensures in the charge a mole- cular ratio of alkali metal oxide to alumina of at least 1 to 1 and a molecular ratio of calcium oxide to silica equal to 2?0.03 to 1, and simultaneously comminuting the solid compo- nents of the resultant charge to obtain a fraction of more than 0.08 mm in an amount of 2 to 15 percent by weight. There- after the resultant charge is corrected and sintered, the sin- ter is leached, the aluminate solution obtained is desilicated and aluminium hydroxide is separated by carbonating and de- composing the aluminate solution, and aluminium hydroxide obtained is calcined. The method provides a 3 to 5 percent increase in the extraction of alumina and oxides of potassium and sodium from the sinter. In addition, the proposed method makes it possible to reduce power consumption for the preparation of the charge by 20 to 30 percent; compressed air consumption is two to three times lower than in the method known in the art.

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