In Engis, Belgium, SUEZ Environnement is using 4 CENTRAC from EXTRACTION SYSTEMS. An automatic crane system fills the hoppers with sawdust and compost. New silo building for cement additives. n Barroso, Brazil, 4 CENTRAC are in use for the cement manufacturer Holcim. They are discharging pozzolana, clay, limestone and marl from new silos.