Method for crystallizing soluble salts of divalent anions...

C - Chemistry – Metallurgy – 01 – D

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C01D 3/14 (2006.01) C01D 3/16 (2006.01) C01D 5/00 (2006.01) C01D 7/00 (2006.01)

Patent

CA 2584696

The invention pertains to removing soluble alkali metal or ammonium salt of a divalent anion from brine comprising following steps: obtaining brine with NaCl-concentration between 150g/L and saturation in the presence or absence of a crystal growth inhibitor for NaCl (CGI-NaCl), or with NaCl concentration above saturation in the presence of a CGI-NaCl, said brine optionally comprising a crystal growth inhibitor for the alkali metal or ammonium salt of the divalent anion (CGI-DA) ; if necessary, acidifying the solution to pH<11.5; if the concentration of CGI-DA is less than 20 mg/L, adding CGI-DA to obtain at least 20 mg CGI-DA/L; subjecting the solution to a membrane filtration; if the concentration of CGI-DA in the concentrate from the separation is less than 20 mg/L, adding CGI-DA to obtain at least 20 mg CGI- DA/L; crystallizing the concentrate; removing the crystallized alkali metal or ammonium salt of the divalent anion.

La présente invention a trait à l'extraction d'un sel d'ammonium ou de métal alcalin d'un anion divalent issu d'une saumure, comprenant les étapes suivantes: obtention d'une saumure ayant une concentration en NaCl comprise entre 150g/L et la saturation en la présence ou en l'absence d'un inhibiteur de croissance de cristal pour NaCl (CGI-NaCI), ou ayant une concentration en NaCl supérieure à la concentration de saturation en la présence d'un CGI-NaCI, ladite saumure comprenant éventuellement un inhibiteur de croissance de cristal pour le sel d'ammonium ou de métal alcalin de l'anion divalent (CGI-DA); acidification de la solution à un pH <11.5; si la concentration en CGI-DA est inférieure à 20 mg/L, adjonction de CGI-DA pour obtenir au moins 20 mg de CGI-DA/L; mise en oeuvre d'un filtrage membranaire sur la solution; si la concentration en CGI-DA dans le concentré issu de la séparation, est inférieure à 20 mg/L, adjonction de CGI-DA pour obtenir au moins 20 mg CGI-DA/L; cristallisation du concentré; extraction du sel d'ammonium ou de métal alcalin de l'anion divalent.

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