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C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
C01F7/06—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom by treating aluminous minerals or waste-like raw materials with alkali hydroxide, e.g. leaching of bauxite according to the Bayer process
C01F7/0613—Pretreatment of the minerals, e.g. grinding
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FR686894D1929-03-131929-03-13Perfectionnement aux procédés de préparation de l'alumine à partir de bauxites ou de minerais non halogénés d'alumine
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