Process for production of monohydrate alumina from...

C - Chemistry – Metallurgy – 01 – F

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C01F 7/14 (2006.01)

Patent

CA 2294478

Process for production of monohydrate alumina (boehmite) with precipitation from supersaturated sodium aluminate solutions starting at temperatures lower than 100 ~C. The current invention is referred to a new aluminium precipitation process from supersaturated sodium aluminate solutions at temperatures lower than 100 ~C in which aluminium is precipitated with the form of monohydrate alumina (boehmite, Al2O3.H2O). The process for production of monohydrate alumina (boehmite, Al2O3.H2O), from supersaturated sodium aluminate solutions, is characterised by precipitation at temperatures lower than 100 ~C. The process comprises a highly innovative variation of the precipitation step in the current Bayer process in which it is achieved 40 % energy reduction in the calcination stage and more than 10 % total energy savings in the Bayer process.

La présente invention concerne un procédé de production de d'oxyde d'aluminium hydraté (boehmite) à partir de solutions d'aluminate de sodium sursaturées en commençant à des températures inférieures à 100 ·C. L'invention concerne en l'occurrence un procédé de précipitation d'aluminium à partir de solutions d'aluminate de sodium sursaturées à des températures inférieures à 100 ·C, procédé selon lequel la précipitation de l'aluminium se fait sous la forme d'oxyde d'aluminium hydraté (boehmite, Al¿2?O¿3?.H¿2?O). Ce procédé de production de d'oxyde d'aluminium hydraté (boehmite, Al¿2?O¿3?.H¿2?O) se caractérise en ce qu'il fait intervenir une précipitation à des températures inférieures à 100 ·C. Le procédé de l'invention constitue une évolution de l'opération de précipitation du procédé Bayer permettant une économie d'énergie de 40 % pour l'opération de calcination, et de plus de 10 % pour l'ensemble du procédé Bayer.

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