C - Chemistry – Metallurgy – 01 – F
Patent
C - Chemistry, Metallurgy
01
F
C01F 7/00 (2006.01) B01J 20/06 (2006.01) B01J 20/08 (2006.01) B01J 21/02 (2006.01) B01J 23/00 (2006.01) C01B 13/18 (2006.01)
Patent
CA 2564744
Process for the preparation of an additive-containing anionic clay comprising the steps of (a) preparing a physical mixture by mixing a dry divalent metal compound with a dry trivalent metal compound, said physical mixture being solid at room temperature, (b) calcining said physical mixture at a temperature in the range 200-800~C without performing a prior aging or shaping step, thereby forming a product containing at least 5 wt% of a hydratable compound, and (c) hydrating the calcined mixture in aqueous suspension containing an additive to form the additive-containing anionic clay. This process provides a simple and cost-effective way of preparing additive~containing anionic clays. The process does neither require aging or reaction steps before calcination, nor does it require precipitation of metal salts or the handling of inhomogeneous slurries.
L'invention concerne un procédé destiné à la préparation d'une argile anionique contenant un additif, consistant (a) à préparer un mélange physique à l'aide d'un composé métallique divalent sec et d'un composé métallique trivalent sec, ce mélange physique étant solide à température ambiante, (b) à calciner ledit mélange physique à une température comprise entre 200 et 800 ·C sans étape préalable de vieillissement ou de façonnage, pour former un produit contenant au moins 5 % en masse d'un composé pouvant être hydraté, et (c) à hydrater le mélange calciné dans une suspension aqueuse contenant un additif pour former l'argile anionique contenant l'additif. Ce procédé permet de préparer de manière simple et rentable des argiles anioniques contenant un additif. Le procédé ne nécessite aucune étape de vieillissement ou de réaction avant la calcination, ni d'étape de précipitation des sels métalliques ou de gestion des suspensions épaisses non homogènes.
Brady Michael F.
Jones William
O'connor Paul
Stamires Dennis
Albemarle Netherlands B.v.
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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