Manufacture method of single phase aragonite precipitated...

C - Chemistry – Metallurgy – 01 – F

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C01F 11/18 (2006.01)

Patent

CA 2633808

The present invention is related to the methods of manufacture of single-phase aragonite by controlling calcium ions, particularly, to the methods of manufacture of single-phase aragonite in the solution process by controlling the rate of elution of calcium ions in the suspension of calcium hydroxide by adding the highly concentrated aqueous solution of sodium hydroxide to the suspension of calcium hydroxide and adding the aqueous solution of sodium carbonate to the above mixed aqueous solution at a constant rate. The method of manufacture of single-phase aragonite according to the present invention is characterized by containing no calcite practically since this method is comprised of the steps of manufacturing a suspension in which calcium hydroxide is dispersed in distilled water; controlling calcium ions in the suspension of calcium hydroxide by adding the aqueous solution of sodium hydroxide to the suspension; and supplying the aqueous solution of sodium carbonate at a constant rate while stirring the suspension of calcium hydroxide.

La présente invention concerne des procédés de fabrication d'aragonite à phase simple par le contrôle d'ions de calcium, notamment à des procédés de fabrication d'aragonite à phase simple dans le procédé de solution par le contrôle du taux d'élution d'ions de calcium dans la suspension d'hydroxyde de calcium par l'ajout de la solution aqueuse de concentration élevée d'hydroxyde de sodium à la suspension d'hydroxyde de calcium et l'ajout de solution aqueuse de carbonate de sodium à ladite solution aqueuse mélangée à un taux constant. Le procédé de fabrication d'aragonite à phase simple selon la présente invention est caractérisé par l'absence quasi totale de calcite étant donné que le procédé comprend les étapes suivantes: la fabrication d'une suspension dans laquelle l'hydroxyde de calcium est dispersé dans de l'eau distillée; le contrôle d'ions de calcium dans la suspension d'hydroxyde de calcium par l'ajout de la solution aqueuse d'hydroxyde de sodium à la suspension; et la fourniture de la solution aqueuse de carbonate de sodium à un taux constant tout en agitant la suspension d'hydroxyde de calcium.

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