UTILIZATION OF CONSTRUCTION WASTE AS RAW MATERIAL IN MANUFACTURING OF GYPSUM-BASED COMPOSITES

This paper presents a laboratory investigation of new application opportunity of building waste materials and potential usage as a component in production of gypsum based building materials. Production of new type eco-friendly gypsum based composites was studied as a potential utilisation sector. The main focus is directed on gypsum binder mixture properties examination with different proportion of incorporated construction waste materials 5-45%. It was designed and tested fresh state behaviour of gypsum-waste mixture and specimens in standard water/binder ratio. Construction waste material is a fines obtained by combined crushing-sorting installations. Slump flow test of gypsum-waste suspension and dry samples characteristics as compressive and flexural strength, water absorption and shrinkage were tested. On the basis of the obtained results, it was established that the prepared gypsum-waste mixture is an alternative for the production of gypsum based building products. Using the tested mixture in manufacturing processes lead to reduction in the energy and water consumption

TAILINGS CHARACTERIZATION OF "CHELOPECHENE" TAILINGS POND

The composition of Kremikovtzi deposit is complex. The main component is iron and secondary components are barite, lead, manganese. The beneficiation in the Mineral Processing Plant by 1990 year included magnetizing roasting and is produced iron and barite concentrates. The technological tailings (called „black tailings“) are stored at “Chelopechene” Tailings Pond. The black tailings were characterized. The data from laboratory tests indicate that this tailings product is suitable to be used as raw material for flotation recovery of barite if an appropriate technology is developed