calcium carbonate

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calcium carbonate,

CaCO3, white chemical compound that is the most common nonsiliceous mineral. It occurs in two crystal forms: calcite, which is hexagonal, and aragonite, which is rhombohedral. Calcium carbonate is largely insoluble in water but is quite soluble in water containing dissolved carbon dioxide, combining with it to form the bicarbonate Ca(HCO3)2. Such reactions on limestonelimestone,
sedimentary rock wholly or in large part composed of calcium carbonate. It is ordinarily white but may be colored by impurities, iron oxide making it brown, yellow, or red and carbon making it blue, black, or gray. The texture varies from coarse to fine.
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 (which is mainly composed of calcite) account for the formation of stalactites and stalagmites in caves. Iceland spar is a pure form of calcium carbonate and exhibits birefringence, or double refractionrefraction,
in physics, deflection of a wave on passing obliquely from one transparent medium into a second medium in which its speed is different, as the passage of a light ray from air into glass.
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Calcium Carbonate

 

CaCO3, a salt.

Calcium carbonate occurs in nature in two mineral forms with differing crystalline structures: aragonite and the widely distributed calcite. Calcium carbonate decomposes when heated above 900°C: CaCO3 = CaO + CO2 (a means of obtaining lime). It is sparingly soluble in water (14 mg calcite per liter at 18°C) and readily soluble in acids. Natural calcium carbonate (limestone, marble) is used as a construction material; chalk (powdered calcium carbonate) serves as a filler for rubber stock, paper, and linoleum. A softer and finer product, called precipitated calcium carbonate (obtained through the reaction of CaCl2 and Na2CO3), is used in the manufacture of tooth powderand cosmetics.

calcium carbonate

[′kal·sē·əm ′kär·bə‚nāt]
(inorganic chemistry)
CaCO3 White rhombohedrons or a white powder; occurs naturally as calcite; used in paint manufacture, as a dentifrice, as an anticaking medium for table salt, and in manufacture of rubber tires.

calcium carbonate

A low-density white pigment for use in paint; provides little opacity; used mainly to provide bulk and flatness.

calcium carbonate

a white crystalline salt occurring in limestone, chalk, marble, calcite, coral, and pearl: used in the production of lime and cement. Formula: CaCO3
References in periodicals archive ?
began pelletizing its own CaCO3 concentrate 18 months ago in its North Vernon, Ind.
CORPORATE DEVELOPMENTS 9 Carmeuse Takes Over Oglebay-Norton 9 Readymix Plc Announces Acquisition of Limestone Reserves 9 Positive Associates Merges with RaKeM 9 Tata Steel Inks a Joint Venture Deal with Al Bahja 9 KASVINA Commences Construction of a CaCO3 Plant 9 Aracruz Signs a Deal with SMI 10 Jordan Minerals Plans to Set Up a New Mill 10 ShengdaTech and Jinan Anne Paper Unveil New NPCC Product 10 ShengdaTech Introduces NPCC Product for PE Plastics 10 Omya Acquires Huber 10 Colorcon Takes Over Chr.
o limestone powder for flue gas desulphurization, in an amount of 240 000 tonnes, with the following parameters Parameter guaranteed quality parameters - CaCO3 min.
Also high CaCO3 and pH, high amounts of bicarbonate in irrigation water and high usage of phosphorus fertilizer in soil have negative effect on absorbability of Zn and Mn and by lasting time, the absorbability of these elements decreased.
From 10 feet to 90 feet all assays were 100% CaCO3 with the exception of four 5 foot intervals that assayed at 98.
BNR-5 - CaCO3 BNR-6 - CaCO3 BNR-7 - CaCO3 0-25' - 40.
At neutral to slightly basic pH, where CaCO3 forms, B exists as boric acid and borate.
The quality parameters - Fertilizer - biokondycjoner soil, resulting in faster release of the soil organic matter,- Contains an extract of seaweed - Pheoflore complex,- Content - 4% N nitrogen in ammonium form,- 11% SO3 soluble in water,- 2% of magnesium oxide MgO,- 68% CaCO3 Mezocalc.
The initial phase will be to re-open the Monarch Mine in eastern Kern County, California to supply central and southern California customers with very high grade calcium carbonate (CaCO3) in the range of 97% to 99% CaCO3 with a whiteness grade of plus 96% Hunter and GE brightness.
The composition of the water and sludge involves high levels of CaCO3 which has huge environmental impacts, in large quantities this composition causes soil pores to clog which reduces rainfall infiltration thus lowering the quality of the soil.
A series of known chemical reactions occur that produce sediments, such as SiO2, Mg (OH)2, CaCO3 and MgCO3, that are the main components of scale formation in untreated water.
2H2O and CaCO3 and a rare earth oxide, wherein the gradient bioceramic coating comprises a first gradient layer, a second gradient layer and a third gradient layer and wherein the first gradient layer and the second gradient layer are composed of powdery titanium and powdery composite ceramics, and the third gradient layer consists of powdery composite ceramics.