22.10.2024

New aspects on the reduction of chromates - increase in shelf life for finished products

 
Because of the highly oxidizing and alkaline conditions of the kiln, during the clinker production chromium(III), which is naturally contained in traces in the clinker, is partially converted to toxic water soluble chromium(VI). As a result, Portland clinkers and cements contain soluble chromates which are reported to be the main cause for skin irritation (allergic contact dermatitis). The European Commission has issued its Directive 2003/53/EC in 2005 to control the Cr6+ content in cements. The study discusses the various options to chemically reducing Cr(VI) in cements and downstream products and the physical dosing and dispersion mechanisms of reducers both in liquid and in powder form. An even dispersion of the reagents is essential to obtain additional properties in the finished, packaged products such as extended shelf-life.
Duration: 20:55
Speaker: Dr Enver Akin
Company: MIG Material Innovative Gesellschaft
Conference: ECS Conference
Location: Nuremberg
Date: 27.03.2023