Loading patent…
AssigneeChryso
InventorsJean-Phillipe Perez, Olivier Malbault, Martin Mosquet
Estimating the term…
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 CrO72−/CrO42− (−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.
An aqueous suspension of the hydroxide of at least one of a selected transition element and of tin, whose oxidation-reduction potential is less than that of the CrO42−/Cr(OH)3 couple wherein the aqueous suspension presents a pH between 2 and 11, limits excluded, is capable of reducing the chromium VI content of cement to a value at most equal to 2 ppm, includes from 0.5 to 80% by weight of dry matter of the hydroxide of at least one transition element and/or of tin with respect to the quantity of water and is stabilised by a hydrosoluble stabilisation agent.
(canceled)
(canceled)
A method for producing cements comprising a chromium VI content no greater than 2 ppm comprising the steps of:
(canceled)
(canceled)
Dependencies are inferred from the claim text.