Process for recovery of alumina and silica

Details Process for recovery of alumina and silica Process for recovery of alumina and silica

C - Chemistry, Metallurgy

01

F

C01F 7/22 (2006.01) C01B 33/12 (2006.01) C01B 33/187 (2006.01) C01F 7/30 (2006.01) C01F 7/46 (2006.01)

Patent

CA 2240067

A process for the simultaneous recovery of substantially pure alumina and silica from an aluminosilicate. The process comprises the following steps: (i) heating the aluminosilicate with hydrated CaCl2 to obtain calcium-alumino- silicate and calcium-aluminate products, wherein the CaCl2 is substantially free of MgCl2; (ii) leaching the products with HCl to form a solution comprising AlCl3 and CaCl2, and insoluble silica; (iii) separating the insoluble silica from the solution; and (iv) crystallizing AlCl3 from the solution and recovering the alumina from the crystallized AlCl3. The process may further comprise the following steps: (v) substantially removing MgCl2 from the CaCl2 solution of step (iv); and (vi) recycling the CaCl2 solution for use in step (i).

L'invention concerne un procédé pour récupérer simultanément de l'alumine et de la silice sensiblement pures à partir d'aluminosilicate. Le procédé consiste à: (i) chauffer l'aluminosilicate avec du CaCl¿2? hydraté pour obtenir de l'aluminosilicate de calcium et de l'aluminate de calcium, le CaCl¿2? étant sensiblement exempt de MgCl¿2?; (ii) lessiver le produit obtenu avec du HCl, pour former une solution contenant du AlCl¿3? et du CaCl¿2?, la silice restant insoluble; (iii) séparer la silice insoluble de la solution et (iv); cristalliser l'AlCl¿3? de la solution et récupérer l'alumine à partir du AlCl¿3? cristallisé. Le procédé peut, en outre, comprendre les étapes additionnelles consistant à: (v) éliminer l'essentiel du MgCl¿2? de la solution de CaCl¿2? de l'étape (iv); et (vi) recycler la solution de CaCl¿2? pour l'utiliser à l'étape (i).

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