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Machine translation
1. (WO1980001799) PROCESS FOR TRANSFORMING HYDRARGILLITE INTO BOEHMITE
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1980/001799    International Application No.:    PCT/FR1980/000030
Publication Date: 04.09.1980 International Filing Date: 26.02.1980
IPC:
C01F 7/44 (2006.01), C01F 7/46 (2006.01)
Applicants:
Inventors:
Priority Data:
7905688 28.02.1979 FR
Title (EN) PROCESS FOR TRANSFORMING HYDRARGILLITE INTO BOEHMITE
(FR) PROCEDE DE TRANSFORMATION DE L"HYDRARGILLITE EN BOEHMITE
Abstract: front page image
(EN)Hydrothermal transformation process of hydrargillite into boehmite which comprises the preparation of a hydrargillite suspension in water (A) on the basis of 150g/l and 700g/l of dry material expressed in Al2O3, the pressurized thermal processing at a temperature comprised between 200 C and 270 C, the temperature raising speed of said suspension being at least 1 C/minute, and letting it stay during a time period comprised between 1 minute and 60 minutes in a stay area (D) at a temperature in the range of 200 C and 270 C. The boehmite obtained has a granulometry at least equal to that of the initial hydrargillite and is very poor in alkaline elements.
(FR)Procede de transformation hydrothermale de l"hydrargillite en boehmite qui consiste a preparer une suspension d"hydragillite dans de l"eau (a) a raison de 150 g/l et 700 g/l de matiere seche exprimee en Al203, a la traiter thermiquement sous pression a une temperature comprise entre 200 C et 270 C, la vitesse de montee en temperature de ladite suspension etant d"au moins 1 C/minute, et a la faire sejourner pendant un temps compris entre 1 minute et 60 minutes dans une zone de sejour (D) a une temperature comprise dans l"intervalle 200 C a 270 C. La boehmite obtenue dispose d"une granulometrie au plus identique a celle de l"hydrargillite initiale et est tres appauvrie en elements alcalins.
Designated States:
Publication Language: French (FR)
Filing Language: French (FR)