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C01F7/20—Preparation of aluminium oxide or hydroxide from aluminous ores using acids or salts
C01F7/26—Preparation of aluminium oxide or hydroxide from aluminous ores using acids or salts with sulfuric acids or sulfates
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FR812394D1935-09-211936-07-22Procédé d'extraction par l'acide sulfurique de l'alumine contenue dans les argiles, kaolins, bauxites, etc.
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