Process for preparing cement with a low hexavalent chromium content

摘要

This invention relates to a process for producing cement having a hexavalent chromium content lower than 2 ppm, when hydrated, comprising the step of adding, to the cement or processing intermediate thereof ammonium, alkaline metal or earth alkaline metal disulphides and/or polysulphides. The present invention also relates to the product that can be obtained by such a process.