A process for removal of impurities from secondary alumina...

Details A process for removal of impurities from secondary alumina... A process for removal of impurities from secondary alumina...

C - Chemistry, Metallurgy

01

F

C01F 7/46 (2006.01)

Patent

CA 2470297

The invention relates to a process for removal of impurities from secondary aluminia fines and alumina and/or fluorine containing materiel comprising. (a) acidification by adding an acid (2,12, 32) to the material to be purified (1,11,31); (b) heating the acidified mixture (3,13,35) ; (c) leaching the mixture in a solution of an acid (6,16,39) ; (d) separating the solid and liquid.

L'invention concerne un procédé d'élimination d'impuretés à partir de fines d'alumine secondaire et d'une matière contenant de l'alumine et/ou du fluor. Ce procédé consiste (a) à réaliser une acidification par ajout d'un acide (2, 12, 32) à la matière à purifier (1, 11, 31), (a) à chauffer le mélange acidifié (3, 13, 35), (c) à lixivier ledit mélange dans une solution d'un acide (6, 16, 39), et (d) à séparer le solide du liquide.

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