by treating aluminous minerals with sodium carbonate, e.g. sinter processes (C01F7/0613, C01F7/066 take precedence)

Full Title

Compounds of aluminium > Aluminium oxide; Aluminium hydroxide; Aluminates > Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom (C01F7/028 takes precedence) > by treating aluminous minerals with sodium carbonate, e.g. sinter processes (C01F7/0613, C01F7/066 take precedence)

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• C01F 7/085 according to the lime-sinter process