Aqueous solution of chromium salt and method for producing same

C - Chemistry – Metallurgy – 01 – G

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C01G 37/14 (2006.01) C01B 25/37 (2006.01) C23C 22/27 (2006.01) C23C 22/30 (2006.01)

Patent

CA 2545320

Disclosed is an aqueous solution of a chromium salt which is characterized in that the oxalic acid content is not more than 8 weight% relative to chromium. In this aqueous solution of a chromium salt, the total organic carbon is not more than 4 weight% relative to chromium. The chromium salt may preferably be a chromium chloride, a chromium phosphate or a chromium nitrate. The chromium chloride may preferably contain a basic chromium chloride represented by the following composition formula: Cr(OH)xCly (wherein 0 < x <= 2, 1 <= y < 3, and x + y = 3). The chromium phosphate may preferably be one represented by the following composition formula: Cr(H3-3/nPO4)n (wherein n is a number satisfying 2 <= n <= 3). The chromium nitrate may preferably be a basic chromium nitrate represented by the following composition formula: Cr(OH)x(NO3)y (wherein 0 < x <= 2, 1 <= y < 3, and x + y = 3).

L'invention concerne une solution aqueuse de sel de chrome caractérisée en ce que la teneur en acide oxalique est inférieure à 8 % en poids par rapport au chrome. Dans cette solution aqueuse de sel de chrome, la teneur totale en carbone organique est inférieure à 4 % en poids par rapport au chrome. Le sel de chrome peut de préférence être un chlorure de chrome, un phosphate de chrome ou un nitrate de chrome. Le chlorure de chrome peut de préférence contenir un chlorure de chrome de base représenté par la formule de composition suivante : Cr (OH) ¿x?Cl¿y? (dans laquelle 0 < x = 2, 1 = y < 3, et x + y = 3). Le phosphate de chrome peut de préférence être représenté par la formule de composition suivante : CR (H¿3-3/n?PO¿4?)¿n? (dans laquelle n est un nombre satisfaisant à l'équation 2 = n = 3). Le nitrate de chrome peut de préférence être un nitrate de chrome de base représenté par la formule de composition suivante : Cr (OH)¿x?(NO3)¿y? (dans laquelle 0 < x = 2, 1 < 3, et x + y = 3).

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