C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 22/06 (2006.01)
Patent
CA 2535022
The invention relates to a hydroxide aqueous suspension of at least one selected transition element of which the potential oxidation reduction is less than that of the pair CrO¿7??2-¿/CrO¿4??2-¿ (-0.12 V) having a pH between 2 and 11, limits excluded, for reducing the content of chrome VI of cement to a value no greater than 2 ppm. The suspension is characterized in that it contains 0.5 to 80 % by wt. of dry material of hydroxide of at least one transition element with regard to the quantity of water and in that it is stabilized by a hydrosoluble stabilizer. This suspension makes it possible to reduce the content of chrome VI of cements to a value no greater than 2 ppm.
L'invention concerne une suspension aqueuse d'hydroxyde d'au moins un élément de transition sélectionné, dont le potentiel d'oxydo~ réduction est inférieur à celui du couple Cr072-/Cr042- (-0.12 V) ayant un pH compris entre 2 et 11, bornes exclues, pour réduire la teneur en chrome VI du ciment a une valeur au plus égale à 2 ppm, qui se caractérise en ce qu'elle comprend de 0,5 à 80% en poids de matiere seche d'hydroxyde d'au moins un element de transition rapporte à la quantité d'eau et en ce qu'elle est stabilisée par un agent de stabilisation hydrosoluble. Cette suspension permet de réduire la teneur de chrome VI des ciments a une valeur au plus égale à 2 ppm.
Malbault Olivier
Mosquet Martin
Perez Jean-Philippe
Chryso
Robic
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