Document Type: Research Article
Laboratory of Biomonitoring of the Environment. Coastal Ecology and Ecotoxicology Unit, Carthage University, Faculty of Sciences of Bizerte, Zarzouna7021, TUNISIA
Laboratory quality control, cement Bizerte Baie Sabera, 7018 Bizerte, TUNISIA
Centre for Marine and Environmental Research (CIMA), Faculty of Sciences and Technology, University of Algarve, Portugal Campus de Gambelas 8005-139 Faro, PORTUGAL
Laboratory of Biomonitoring of the Environment. Coastal Ecology and Ecotoxicology Unit, Carthage University, Faculty of Sciences of Bizerte, Zarzouna7021
This study aims to determine the major elements of Portland cement type I and II (CEMI and CEMII) in a cement factory in north Tunisia and which metal elements are introduced into the production process. We determine also the metal input rate and their distribution at the entrance and exit of the process. The major elements were analyzed and the trace elements (Arsenic, barium, lead, mercury, boron, strontium, Cadmium, Chromium, copper, manganese, nickel, and zinc) were identified. The concentrations of heavy metals in CEMI showed no significant difference p<0.05 with those in CEMII. All refractory metals generally tend to be incorporated into the clinker (Ba, Sr, Mn, Ni, Cu, Zn, Cr, and V), while the lower part, especially volatile and semi-volatile metals accumulate in the cement dust. Most metals in cement are infused with clinkers.Heavy metals in the cement can originate from a variety of processes in cement manufacture, including its initial presence in raw materials and fuel, incorporation into kiln refractory brick, metal erosion from the raw mill grinding process, and in other forms such as gypsum, and cement kiln dust.