C - Chemistry – Metallurgy – 01 – F
Patent
C - Chemistry, Metallurgy
01
F
C01F 11/00 (2006.01) C01B 35/12 (2006.01) C01B 35/18 (2006.01) C30B 29/10 (2006.01)
Patent
CA 2234650
An improved method is provided for producing crystalline calcium hexaborate tetrahydrate, synthetic nobleite, by the reaction of boric acid and lime in an aqueous slurry. Reaction conditions include boric acid to water molar ratios of greater than 0.25:1, lime to boric acid molar ratios in the range of 0.05-0.15:1 and temperatures in the range of 85 °C - 105 °C. A novel crystalline product is produced having a unique crystal habit resulting in improved physical properties. Dehydration of this product produced a novel amorphous, anhydrous product having similar crystal habit and physical properties.
L'invention concerne un procédé amélioré pour l'élaboration d'une forme synthétique de la nobléite minérale, le tétrahydrate d'exaborate de calcium cristallin, par réaction entre de l'acide borique et de chaux dans une suspension aqueuse. Les conditions de réaction sont les suivantes: rapport molaire acide borique/eau supérieur à 0,5:1, rapport molaire chaux/acide borique compris entre 0,05 et 5,15:1, et températures oscillant entre 85 DEG et 105 DEG . Ce nouveau produit cristallin a un habitus cristallin inédit qui lui confère de propriétés physiques améliorées. Sa déshydratation donne un matériau amorphe et anhydre de type nouveau qui a un habitus cristallin et des propriétés physiques analogues.
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
U.s. Borax Inc.
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