C - Chemistry – Metallurgy – 01 – F
Patent
C - Chemistry, Metallurgy
01
F
C01F 11/18 (2006.01) C01F 3/00 (2006.01) C01F 5/24 (2006.01)
Patent
CA 2393278
A method of producing a rheologically stable concentrated aqueous suspension of a particulate alkaline earth metal carbonate which method comprises the following steps: (a)preparing a dilute aqueous suspension of the carbonate having a solids content of not more than 40% by weight;(b)dewatering the dilute aqueous suspension to form a carbonate suspension having a solids content in the range of from 45% to 65% by weight;(c)further dewatering the suspension formed in step (b) by thermal evaporation under reduced pressure to raise the solids content of the suspension by a further differential amount of at least 5% by weight; and (d)after at least some of the dewatering in step (b) treating the suspension by a mechanical working process in which at least 1 kW.hr per tonne of carbonate on a dry weight basis is dissipated to refluidise the suspension.
L'invention porte sur un procédé de production de suspensions aqueuses concentrées et rhéologiquement stables de particules de carbonate de métaux alcalino terreux comportant les étapes suivantes: (a) préparation d'une suspension aqueuse étendue du carbonate dont la teneur en solides en poids ne dépasse pas 40 %; déshydratation de la solution jusqu'à l'obtention d'une teneur en solides de 45 à 65 % en poids; (c) mélange facultatif de la solution obtenue en (b) avec un agent disperseur pour former une suspension fluide; (d) nouvelle déshydratation de la suspension fluide formée en (b) par évaporation thermique sous atmosphère réduite augmentant d'une nouvelle quantité différentielle de 5 % en poids; (e) après une partie au moins de la déshydratation effectuée en (c), traitement de la suspension par un procédé mécanique dépensant au moins 1 kWh/heure par tonne de carbonate pour refluidiser la suspension.
Mortimer Mark Daniel
Purdey John Anthony
Skuse David Robert
Thrale Deborah Susan
Imerys Minerals Limited
Sim & Mcburney
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