What is Calcite / Grounded Calcium carbonate (GCC) ?

Calcium carbonate, or CaCO3,  is one of the most useful and versatile materials known to man.  It is extremely common and found throughout the world in sedimentary, metamorphic and igneous rocks. Some geologists consider it to be a “ubiquitous mineral” – one that is found everywhere.

It comprises more than 4% of the earths crust and is found throughout the world. Its most common natural forms are chalk, limestone, and marble, produced by the sedimentation of the shells of small fossilized snails, shellfish, and coral over millions of years. Although all three forms are identical in chemical terms, they differ in many other respects, including purity, whiteness, thickness and homogeneity.

Calcium carbonate rocks are spread throughout the world, which is why they have been among the most widely used raw materials for more than 5000 years. Long ago, the Egyptians built their pyramids with limestone, and today we still use hundred of millions of tonnes of calcium carbonate in the building industry alone.

However, although the deposits are plentiful, only a few are of sufficiently high quality to be worked and even a fewer number of deposits will provide raw materials for industrial and agricultural uses other than the construction and roads building industry. Only if the purity, degree of whiteness, thickness and homogeneity are acceptable is commercial extraction worthwhile.

After quarrying, further treatment is required to process natural calcium carbonates of the highest quality, known generically as Ground Calcium Carbonate (GCC). Precipitated Calcium Carbonate (PCC) is a synthetic calcium carbonate produced industrially by means of a recarbonisation process. Both GCC or PCC can be used in a wide range of applications. For each end use there exists a tailor-made product, where fineness and particle size distribution are optimally balanced to meet the technical demands of that particular requirement.

Calcite has a hardness of 3.0 on the Mohs hardness scale and that makes it suitable as a low-hardness abrasive.

Calcium Carbonate as Chalk has been used as a writing tool for over 10,000 years and is a fine, microcrystalline material. As limestone, calcium carbonate is a biogenic rock, and is more compacted than chalk. As marble, calcium carbonate is a coarse-crystalline, metamorphic rock, which is formed when chalk or limestone is re-crystallized under conditions of high temperature and pressure.

It is Natural / Grounded Calcium Carbonate [chemical formula is CaCO3]. Also known as Calcite.

Synonyms of Calcite includes Grounded Calcium Carbonate (GCC), Limestone, Calcium Carbonate, French chalk, marble powder; chalk; choona powder;  carbonate etc.

Calcite properties:

The properties of calcite make it one of the most widely used minerals. It is used as a construction material, abrasive, agricultural soil treatment, construction aggregate, pigment, pharmaceutical, acid neutralization, Sorbents, monuments & statuary and more. It has more uses than almost any other mineral.  This makes it a very essential mineral in our day-to-day life.

Read More..

Calcium Carbonate is an exceptional mineral. The chemical formula CaCO3 covers a raw material, which is widespread throughout nature, whether dissolved in rivers and oceans, in molten form as “cold” carbonatite-lava, or solid as a mineral in the form of stalactites, stalagmites or as the major constituent of whole mountain ranges.

Plants and animals need calcium carbonate to form their skeletons and shells. In fact, when considering our lives, modern mankind could hardly imagine existing without calcium carbonate. Almost every product in our daily lives either contains calcium carbonate or has some association with the mineral during its production.

The Earth’s crust contains more than 4% calcium carbonate. As a result, the three calcium carbonate minerals – calcite, aragonite and vaterite – are among the most important rock-forming minerals. Rocks are not the only calcium carbonate deposits in nature, most stretches of water and countless plants and animals contain huge amounts of calcium carbonate. The link between these natural resources is the calcium carbonate cycle.

Plants and animals absorb calcium carbonate from water -where it exists, in most cases, in the dissolved form of calcium hydrogen carbonate Ca(HCO3)2 – and use it to build up their skeletons and shells. After their death, crustacea, coccoliths, algae and corals form sedimentary deposits on sea-beds, thus the rock forming process is put in motion. The first stage is the sedimentation process from which chalk and limestone originate.

Chalk is a poorly compacted sedimentary calcium carbonate rock, whose dia-genesis is incomplete. When the sedimentation process is completed this results in the formation of limestone. If the sedimentation process takes place in magnesium containing water a dolomitisation may occur. Part of the calcium ions in the crystal lattice are replaced by magnesium ions, a fact that leads to the formation of dolomite CaMg[CO3]2.

Marble is a metamorphic rock, which is the result of a recrystallisation process of limestone, under conditions of high pressure and temperature. The carbonate rocks, chalk, limestone, dolomite and marble rocks are subject to erosion, under the influence of wind, temperature and water they dissolve, and the cycle may start again.

 

Calcite Chemical Properties/Composition :

CaCO3 : Min. 98.5%
MgCO3 : max 1.0%
Fe2O3 : max 1.0%

 

Calcite Physical Properties :

Appearance : White fine powder
Sp. gravity : 2.6 – 2.8
Oil absorption : 12 to 15
PH of 10% slurry : 9 to 10
Water Soluble matter : max 1%
Volatile matter : max 0.5%
Purity as CaCO3 : 95%

 

Calcite Industrial Applications & Uses :

Calcium carbonate is the most widely used mineral, both as a filler and due to its special white color – as a coating pigment. Calcium carbonate, as it is used for industrial purposes, is ground calcium carbonate, or GCC. GCC, as the name implies, involves crushing and processing limestone to create a powdery-like form graded by size and other properties for many different industrial and day-to-day life applications.  i.e.,

  • A. Calcite in Paper industry: In the paper industry it is valued worldwide for its high brightness and light scattering characteristics, and is used as an inexpensive filler to make bright opaque paper. In past few decades, the use of calcium carbonate has grown significantly as technology in the paper industry has moved from acid to neutral sizing. Today, calcium carbonate is the most widely used mineral in paper-making. GCC and PCC are used both as a filler and a coating pigment, and help produce papers with high whiteness and gloss and good printing properties.
  • B. Calcite in Plastics industry: Calcium carbonate is by far the most important mineral for compounding with polymers. By weight it accounts for more than 60% of the filler and reinforcements market. Main applications include plasticized and rigid PVC, unsaturated polyesters, polypropylene and polyethylene.

    Other important areas of use include rubber, foamed latex carpet-backings, sealants and adhesives. Calcium carbonate is not only a filler added to reduce costs and extend petroleum based resources, many properties of the plastic can be influenced by the use of calcium carbonate. Breathable PE-films for hygiene products and the building industry, for example, can only be produced with the incorporation of a filler such as calcium carbonate.

  • C. Calcite in Paints and Coatings industry: As an extender, calcium carbonate can represent as much as 30% by weight in paints. Calcium carbonate also is used widely as a filler in adhesives, and sealants. In paints and coatings, calcium carbonate has established itself as the main extender. Fineness and particle-size distribution can contribute to the opacity of coatings. Moreover, calcium carbonate can offer improvements in weather resistance, anti-corrosion and rheological properties, coupled with low abrasiveness, low electrolyte content, and a pH stabilizing effect. In water-based systems calcium carbonate reduces the drying time.
  • D. Calcite in Pharmaceuticals and Food industry: Calcium carbonate is used widely as an effective dietary calcium supplement, antacid, phosphate binder, or base material for medicinal tablets. In products such as baking powder, toothpaste, dry-mix dessert mixes, dough, and wine. Calcium carbonate is the active ingredient in agricultural lime, and is used in animal feed.
  • E. Calcite in Environment protection: As a natural product, calcium carbonate is perfect for environmental protection applications. For example, flue gas desulphurization, drinking water treatment, waste water treatment and forest and lake liming for the neutralization of acid rain, are all growth areas for the use of calcium carbonate. It has a natural buffer-effect and works as a pollution-filter. These properties, likewise, apply to the derivative products.
  • F. Calcite in Agriculture industry: Calcium fertilizers were one of the first to be widely used. The Greeks and Romans were aware of their attributes. Their use guarantees an adequate supply of calcium to plants and stabilizes the pH-value of the soil. These characteristics make calcium carbonate an important fertilizer for the agriculture and forestry sectors. Europe is one of the biggest buyer of this material. Other agricultural-related uses of calcium carbonate include its use as a calcium supplement in animal feed compounds.
  • G. Calcite in Building Materials and Construction: Calcium carbonate is critical to the construction industry, both as a building material in its own right (e.g. marble), and as an ingredient of cement. It contributes to the making of mortar used in bonding bricks, concrete blocks, stones, roofing shingles, rubber compounds, and tiles. Calcium carbonate decomposes to form carbon dioxide and lime, an important material in making steel, glass, and paper. Calcium carbonate has found an innovative application in the concrete market. It is increasingly used as a quality filler in concrete applications, such as concrete wares (paving-stones, tubes, sewage-tanks), ready-mixed concrete and prefabricated elements. It improves the concrete density, pre-stability and durability. Its stable color quality increases the aesthetics which make it very suitable for architectural applications.
  • H. Calcite misc. Applications : these are as following :-

    • a. Used in pollution control, neutralizing chemicals for acid wash, source of calcium salt.
    • b. Applications of this is also in bulk like cement, steel and other industries.
    • c. Pulverized limestone and marble are often used as a dietary supplement in animal feed. Chickens that produce eggs and cattle that produce milk need to consume a calcium-rich diet. Small amounts of calcium carbonate are often added to their feeds to enhance their calcium intake.
    • d. Glass, ceramics and blackboard chalk, together with cleaning, dental care and cosmetic products are produced by the wide range of industrial manufacturers who rely on calcium carbonate.
    • e. As a natural mineral, calcium carbonate has a multitude of characteristics that make it an ideal raw material for widely differing uses.
    • f. No one calcium carbonate is exactly like another, whichever property is needed a high grade product is there to meet the demand.

    Diverse requirements such as low iron oxide content for the production of high-quality glasses, the authorization for uses in foodstuffs, good buffering-effect or low abrasion, can be met by an existing grade of calcium carbonate.

We ensure the highest grade & uniform particle size product for the industries like Plastics & paints.

Calcite  Price in India (Our suggested Calcite grades):

Calcite Grades / Model no. VC – 97H10 VC – 96M10 VC – 95L10 VC – 96MC10 VC – 95LC10
Product Name Premium quality Calcite powder superfine High grade limestone powder very fine Calcite powder for paint and plastics Coated Calcite powder (1.5% Stearic) Coated Calcite powder (1% Stearic)
Whiteness / Brightness (%) 97 96 95 96 95
Moisture (%) > 0.5 > 0.5 > 0.5 > 0.5 > 0.5
pH 10 to 11 9 to 10 9 to 10 9 to 10 9 to 10
Specific Gravity (g/cm3) 2.7 – 2.8 2.6 – 2.8 2.6 – 2.8 2.6 – 2.8 2.6 – 2.8
Oil Absorption (ml/100g) 18 to 20 14 to 18 12 to 15 18 to 22 16 to 20
Particle Size 10 micron 10 micron 10 micron 10 micron 10 micron
Top cut (micron) 25 micron 40 micron 40 micron 40 micron 40 micron
CaCO3 (%) > 98.7 93 – 95 > 90 93 – 95 > 90
MgO (%) < 0.5 1.0 – 1.5 1.5 – 2.0 1.0 – 1.5 1.5 – 2.0
Fe2O3 (%) < 0.5 0.5 max 1.0 max 0.5 max 1.0 max
SiO2 (%) < 0.5 2.0 – 2.5 2.0 – 3.0 2.0 – 2.5 2.0 – 3.0
Al2O3(%) < 0.2 < 0.2 < 0.3 < 0.2 < 0.3
Applications in Rubber, Plastic (gum), Paper, Paints & coatings, ink etc. In paints, Plastics, Rubber and Paper industry Filler in Paints & Plastics industry Coated filler in high quality Paints & Plastics in Paints & Plastics industry

For various applications we also manufacture & supply COARSE grade of Calcium Carbonate as per customers’ demand.

Packaging & Delivery Details:
Packaging: 50 kg pp bag; 1ton/bag; 1*20 container, can load 25-27 MT or upon clients’ requirement
Delivery: within 5 – 20 days (depending upon the delivery location) after receiving the deposit