Additive reduction of the hexavalent chromium, its process of production, and applications of this additive, especially in the products of cements.

摘要

The additive to the reduction of hexavalent chromium in the case of products such as, in particular, the cement, the slag or plaster, comprises a stabilized aqueous solution of a reducing agent, of chromium (including: - water - a reducing agent, chromium, such as ferrous sulphate heptahydrate, - an acid, - a reducing agent of the dissolved oxygen in excess water, the solution having a ph of 4 to 6.pour the improvement of the grinding, the additive may comprise in addition to the éthanolamine.l' additive can be sprayed onto the cement in the course of grinding or added in the concrete mixer.