Obtaining fillers based on limestone from deposit ”Darza”-Ulcinj for applications in various industries

Abstract

This paper presents results of investigations of the possibility of using “Darza”-Ulcinj limestone (Republic Montenegro) as filler in various industry branches. Micronization methods, granulometric composition, oil and water absorption and degree of whiteness were investigated, and chemical and thermal analyses (DT/TG) were performed. Physico-chemical properties of this limestone classify it among the poor in quality carbonate raw materials with relatively low CaCO3 content of 92.93%, as well as relatively high MgO content of 3.11% (6.53% content of MgCO3) and low silicate content (SiO2 0.186%). Its quality satisfies requirements of standards on using of calcium carbonate as filler in industry of paints and coatings; and in foundry industry. Due to the low degree of whiteness (85.10%) and low content of CaCO3 (92.93%) „Darza” limestone cannot be used in pharmaceutical and cosmetics industry, paper industry. Due to relatively low content of CaCO 3 and high content of MgO, “Darza” limestone cannot be used in: rubber and PVC industry; sugar industry glass industry; production of mineral fertilizers; production of cattle feed; for neutralization of acidic soils and metallurgy. Relatively high content of heavy metals Pb (30 ppm), Ni (17 ppm) and Cd (3 ppm), as well as biogenic elements Cu (8 ppm) and Fe (375 ppm), additionally limits the application of this material in production of cattle feed and for neutralization of acidic soils.