Process and apparatus for obtaining material of value from a bauxite residue
AssigneeKRSYS GmbH
InventorsEberhard Krause, Horst Schmidt-Bischoffshausen
Life of this patent
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Abstract
The invention relates to a process for obtaining material of value from a bauxite residue which is obtainable or has been obtained by the Bayer process. This process comprises the steps of a) providing an aqueous suspension of the bauxite residue, b) setting a pH of the suspension to a value between 7.2 and 12.2, c) at least partly deagglomerating suspended mineral agglomerates of the bauxite residue, and d) separating the resulting mixture into an iron-rich fraction and into at least one further, preferably silicate-rich fraction. The invention further relates to an apparatus (10) for carrying out the process.
Claims22
Process for obtaining material of value from a bauxite residue, which is obtained by the Bayer process, including the steps of:
- a) providing an aqueous suspension of the bauxite residue, wherein said aqueous suspension has a pH value between 12 and 14;
- b) adjusting pH of the suspension to a value between 7.2 and 12.2;
- c) at least partially disagglomerating suspended mineral agglomerates of the bauxite residue, wherein the suspended mineral agglomerates are disagglomerated by generation of cavitation;
- and
- d) separating a resulting mixture of the disagglomerated suspended mineral agglomerates into an iron-rich fraction and into at least one further fraction.
Dependencies are inferred from the claim text.