C - Chemistry – Metallurgy – 01 – F
Patent
C - Chemistry, Metallurgy
01
F
C01F 11/46 (2006.01)
Patent
CA 2372170
A chemical process for the purification of CaSO4 utilises the ability of an aqueous solution of a chelating agent to selectively dissolve CaSO4, in that the initial extraction can be carried out at certain pH and CaSO4 can be recovered by titration to a different pH (usually a lower pH) following a mechanical treatment, such as centrifugation or filtration, to separate the aqueous chelate solution from insoluble material. Also claimed are an apparatus and the use of chelating agents therefor.
La présente invention concerne un processus chimique permettant de purifier CaSO4, qui utilise la capacité d'une solution aqueuse d'un agent chélateur de dissoudre de façon sélective CaSO4. On peut réaliser l'extraction initiale à un certain pH et on peut récupérer CaSO4 par titration à un pH différent (habituellement un pH plus faible) à la suite d'un traitement mécanique, tel qu'une centrifugation ou une filtration, de façon à séparer la solution aqueuse chelatée des matériaux insolubles. Cette invention concerne aussi un appareil et l'utilisation d'agents chélateurs dans cet appareil.
Mineral Recovery Limited
Oyen Wiggs Green & Mutala Llp
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