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1. (WO1997022554) PROCESS FOR RECOVERY OF ALUMINA AND SILICA
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1997/022554    International Application No.:    PCT/IL1996/000179
Publication Date: 26.06.1997 International Filing Date: 12.12.1996
Chapter 2 Demand Filed:    15.07.1997    
IPC:
C01B 33/12 (2006.01), C01F 7/22 (2006.01), C01F 7/30 (2006.01)
Applicants: MASHAL ALUMINA INDUSTRIES LTD. [IL/IL]; 2 Kaufman Street, 61500 Tel Aviv (IL) (For All Designated States Except US).
NEHARI, Shlomo [IL/IL]; (IL) (For US Only).
GORIN, Chanoch [IL/IL]; (IL) (For US Only).
LIN, Israel, J. [IL/IL]; (IL) (For US Only).
BERKOVICH, Amos [IL/IL]; (IL) (For US Only)
Inventors: NEHARI, Shlomo; (IL).
GORIN, Chanoch; (IL).
LIN, Israel, J.; (IL).
BERKOVICH, Amos; (IL)
Agent: REINHOLD COHN AND PARTNERS; P.O. Box 4060, 61040 Tel Aviv (IL)
Priority Data:
116409 15.12.1995 IL
Title (EN) PROCESS FOR RECOVERY OF ALUMINA AND SILICA
(FR) PROCEDE POUR RECUPERER DE L'ALUMINE ET DE LA SILICE
Abstract: front page image
(EN)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 CaCl¿2? to obtain calcium-alumino-silicate and calcium-aluminate products, wherein the CaCl¿2? is substantially free of MgCl¿2?; (ii) leaching the products with HCl to form a solution comprising AlCl¿3? and CaCl¿2?, and insoluble silica; (iii) separating the insoluble silica from the solution; and (iv) crystallizing AlCl¿3? from the solution and recovering the alumina from the crystallized AlCl¿3?. The process may further comprise the following steps: (v) substantially removing MgCl¿2? from the CaCl¿2? solution of step (iv); and (vi) recycling the CaCl¿2? solution for use in step (i).
(FR)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).
Designated States: AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, CA, CH, CN, CU, CZ, DE, DK, EE, ES, FI, GB, GE, HU, IL, IS, JP, KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MD, MG, MK, MN, MW, MX, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, TJ, TM, TR, TT, UA, UG, US, UZ, VN.
African Regional Intellectual Property Organization (KE, LS, MW, SD, SZ, UG)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, CH, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, ML, MR, NE, SN, TD, TG).
Publication Language: English (EN)
Filing Language: English (EN)