calcium carbonate

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Related to Caco3: Cucl2

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 ?
e, Ca2+, Mg2+, at cell surfaces offering unique precipitation site for CaCO3 crystals (Ercole et al.
Factor 3 is dominated by OM and available Mn in soil samples of alfalfa farms or by CaCO3 and total Cu accounting for 14.
Segun los ensayos realizados se puede afirmar que las muestras tratadas con hidroxido de sodio y calcinadas a 500[grados]C por 2 horas son las mas recomendables para obtener CaCO3 a partir de los residuos de cascara de huevo.
The use of CaCO3 in any combination with PVA resulted in low calorific value due to an increase in the non- combustible content of the resulting briquettes; however, its presence in one sample resulted in increasing the vertical axis disintegration strength.
The casing material, consisting of 20 liters of peat moss, 100 g of CaCO3 and 10 liters of water, was adjusted to pH 5.
En la etapa 1 se observa que en ambos reactores predominaron condiciones de inestabilidad, lo que se controlo con la adicion de bicarbonato de sodio (6000 mg de NaHCO3 / L) para garantizar una relacion DQO : CaCO3 entre 1:0.
PT Tandan Pulpindo will, in addition to bleaching pulp, produce inorganic chemicals such as natrium sulfide (4,000 tons/year), caustic soda (15,000 tons/y), Chlorine (4,000 tons/y), CaCO3 (10,000 tons/y) and Na2CO3 95,000 tons/y).
Times the number of drops by 20, the total mg/L in CaCO3, and then divide by 17.
Table 3 A B CPE, 36% CI 100 100 Calcined clay 60 60 CaCO3 40 40 Ester plasticizer 20 20 Litharge 12 - X-1141 litharge blend - 12
0 mm hdpe in landfill capping works liner leak detection test validation of cylinder test results for appropriate protection geotextile on cell formation validation of leachate stone drainage suitability in relation to stone size, permeability and caco3 content validation of fid surveys for leak detection on existing cap 1.
Por otro lado, la temperatura de degradacion disminuye a medida que aumentan las generaciones hasta en un 5,21%, pero con el uso de la carga mineral talco se observa un aumento del 2,37% y CaCO3 2,02% (Tabla 1).