ADDITIF DE REDUCTION DU CHROME HEXAVALENT, SON PROCEDE D'OBTENTION ,ET APPLICATIONS DE CET ADDITIF NOTAMMENT DANS LES PRODUITS A BASE DE CIMENTS

The invention relates to an additive for reducing hexavalent chromium in products such as, in particular, cement, slag or gypsum, that comprises a stabilised aqueous solution of a chromium reducing agent, containing: water; a chromium reducing agent such as heptahydrated ferrous sulphate; an acid; a...

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Bibliographic Details
Main Author LANG GERARD
Format Patent
LanguageFrench
Published 13.08.2010
Subjects
CHEMISTRY
COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F
INORGANIC CHEMISTRY
METALLURGY
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Summary:The invention relates to an additive for reducing hexavalent chromium in products such as, in particular, cement, slag or gypsum, that comprises a stabilised aqueous solution of a chromium reducing agent, containing: water; a chromium reducing agent such as heptahydrated ferrous sulphate; an acid; an oxygen reducing agent dissolved in excess in water. The solution may have a pH from 4 to 6. In order to improve the grinding, the additive may further include ethanolamine. The additive can be sprayed on cement during grinding, or added in a concrete mixer.
Bibliography:Application Number: FR20070004153