Cements with high levels of soluble chromates

Some years have passed since the introduction of the obligation to maintain the level of soluble chromates below 2 ppm (Directive 2003/53 of the European Community). The use of suitable reducing agents such as ferrous and stannous salts or antimony compounds has been widely described. Factors influencing the choose of the most suitable product range from economical to technical considerations. In some cases, clinkers present extremely high levels of soluble chromates: the differences in technical performances of reducing agents become the critical point for facing the challenging task of producing a CrVI-free cement.

Author: M. Magistri, P. Recchi

Section: Ecology and safety

Keywords: cement, soluble chromates, reducing agent