A process for the reduction of chromium (VI) in cements using an additive product

摘要

The invention relates to an additive product for its inclusion in cements, either during any of the cement manufacturing phases or at the time of its use, intended for the reduction of chromium (VI) in cement. The additive can be used in solid or liquid state and basically contains antimony (III) potassium tartrate. In solid state, the additive is only a chromium (VI) reducer, whereas in liquid state it can further behave as a polyfunctional additive, with the double mission as chromium (VI) reducer and grinding additive for cement. The efficiency of the additive is favored with the use of co-additives of the type of antioxidants or antioxidant synergistic substances, whereas in the case of the additive in liquid state, this efficiency is also increased with a suitable pH control.