Calcite is main additive of gypsum based dry mortar products. Production of calcite more economical than supplying of calcite from other suppliers for biggest capacities. Additive range of calcite 20-30% it is changed from product to product. Production process of calcite is very similar plaster process.
Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO3). The mohs scale mineral hardness, based on scratch hardness comparison, defines value 3 as "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.
It has a defining Mohs hardness of 3, a specific gravity of 2.71, and its luster is vitreous in crystallized varieties. Color is white or none, though shades of gray, red, orange, yellow, green, blue, violet, brown, or even black can occur when the mineral is charged with impurities.
Calcite is transparent to opaque and may occasionally show phosphorescence or fluorescence. A transparent variety called Iceland spar is used for optical purposes. Acute scalenohedral crystals are sometimes referred to as "dogtooth spar" while the rhombohedral form is sometimes referred to as "nailhead spar".
UNITS and MAIN MACHINES
- Crushing and Screening (Jaw crusher, Impact crusher, vibratory screen etc.)
- Drying unit (Weighing belt conveyor, rotary dryer, jet pulse filter, fan)
- Milling classifying unit (Beater plate mill, classifier, cyclone, fan)
- Storage unit (Silos and conveying equipments)