Mikrokal Calcite Raw Material
Calcite or calcium carbonate as its molecule name (CaCO₃ ) is bright, transparent, delicate and its mineral hardness is 3 on the Mohs scale, its specific weight is 2,6 – 2,8 gr/cm3 in 20 °C and the most used filling material in painting, paper, plastic etc. sectors after being ground at micronized levels due to its whiteness, cheapness and other qualities. Calcite is supplied from industrialized countries or imported and then added to products and the more it is consumed, the more developed the industry is, as it indicates.
The following qualities are required for CaCO₃ to be used in the industry:
- The closeness to the usage area of the source and to the ports,
- The reserve of the said source,
- It's chemical purity and impurities,
- It's homogeneity,
- It's whiteness.
What Is Calcite?
Calcite crystals are trigonal-rhombohedral, though actual calcite rhombohedra are rare as natural crystals. However, they show a remarkable variety of habits including acute to obtuse rhombohedra, tabular forms, prisms, or various scalenohedra. Calcite exhibits several twinning types adding to the variety of observed forms. It may occur as fibrous, granular, lamellar, or compact. Cleavage is usually in three directions parallel to the rhombohedron form. Its fracture is conchoidal, but difficult to obtain.
Calcite, like most carbonates, will dissolve with most forms of acid. Calcite can be either dissolved by groundwater or precipitated by groundwater, depending on several factors including the water temperature, pH, and dissolved ion concentrations. Although calcite is fairly insoluble in cold water, acidity can cause dissolution of calcite and release of carbon dioxide gas. Ambient carbon dioxide, due to its acidity, has a slight solubilizing effect on calcite. Calcite exhibits an unusual characteristic called retrograde solubility in which it becomes less soluble in water as the temperature increases. When conditions are right for precipitation, calcite forms mineral coatings that cement the existing rock grains together or it can fill fractures. When conditions are right for dissolution, the removal of calcite can dramatically increase the porosity and permeability of the rock, and if it continues for a long period of time may result in the formation of caves. On a landscape scale, continued dissolution of calcium carbonate-rich rocks can lead to the expansion and eventual collapse of cave systems, resulting in various forms of karst topography. (Wikipedia)
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