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Calcium carbonate

Calcium carbonate
Calcium carbonate
CAS No.
471-34-1
Chemical Name:
Calcium carbonate
Synonyms
nz;pz;ccr;ccw;n34;n43;tm1;k250;omya;ss30
CBNumber:
CB2154602
Molecular Formula:
CCaO3
Formula Weight:
100.0869
MOL File:
471-34-1.mol

Calcium carbonate Properties

Melting point:
825 °C
Density 
2.93 g/mL at 25 °C(lit.)
refractive index 
1.6583
storage temp. 
Store at RT.
solubility 
5 M HCl: 0.1 M at 20 °C, clear, colorless
form 
random crystals
color 
White-beige to slightly beige-gray
PH
9.5-10.5 (100g/l, H2O, 20℃)(slurry)
Water Solubility 
Insoluble
Merck 
14,1657
BRN 
8008338
Stability:
Stable. Incompatible with acids, fluorine, ammonium salts, alum.
InChIKey
VTYYLEPIZMXCLO-UHFFFAOYSA-L
CAS DataBase Reference
471-34-1(CAS DataBase Reference)
EPA Substance Registry System
Carbonic acid calcium salt (1:1)(471-34-1)

SAFETY

Hazard Codes  Xi
Risk Statements  37/38-41-36/38-36
Safety Statements  26-36/37/39-37/39-37
WGK Germany  -
RTECS  FF9335000
TSCA  Yes
HS Code  28365000
Hazardous Substances Data 471-34-1(Hazardous Substances Data)

Calcium carbonate price More Price(79)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 12010 Calcium carbonate puriss., meets analytical specification of Ph. Eur., BP, USP, FCC, E170, precipitated, 98.5-100.5% (based on anhydrous substance) 471-34-1 1kg-r $57.8 2018-11-13 Buy
Sigma-Aldrich 1086403 Calcium Carbonate (AS) United States Pharmacopeia (USP) Reference Standard 471-34-1 1g $352.8 2018-11-22 Buy
Alfa Aesar 010679 Calcium carbonate, Puratronic?, 99.99% (metals basis) 471-34-1 25g $134 2018-11-16 Buy
Alfa Aesar 010679 Calcium carbonate, Puratronic?, 99.99% (metals basis) 471-34-1 5g $40.6 2018-11-16 Buy
Strem Chemicals 20-0200 Calcium carbonate (99.999%-Ca) PURATREM 471-34-1 10g $74 2018-11-13 Buy

Calcium carbonate Chemical Properties,Uses,Production

Description

Calcium carbonate occurs in nature as limestone in various forms, such as marble, chalk, and coral. It is probably the most widely-used raw material in the chemical industry. It has numerous applications, primarily to produce cement, mortars, plasters, refractories, and glass as building materials. It also is used to produce quicklime, hydrated lime and a number of calcium compounds. It is produced either as powdered or precipitated calcium carbonate. The latter consists of finer particles of greater purity and more uniform size. They also have many important commercial applications. Various grades of precipitated calcium carbonate are used in several products, such as textiles, papers, paints, plastics, adhesives, sealants, and cosmetics.

Chemical Properties

White or almost white powder.

Chemical Properties

Calcium carbonate occurs in two forms—hexagonal crystal known as calcite, and orthorhombic form, aragonite. Calcite decomposes on heating at 825°C, aragonite melts at 1,339°C (at 102.5 atm). Density 2.71 g/cm3 (calcite), 2.83 g/cm3 (aragonite); insoluble in water (15mg/L at 25°C); Ksp 4.8x10–9 ; soluble in dilute mineral acids.

Uses

Calcium Carbonate is the calcium salt of carbonic acid which is used as an anticaking agent and dough strengthener. it is available in varying particle sizes ranging from coarse to fine powder. it is practically insoluble in water and alcohol, but the presence of any ammonium salt or carbon dioxide increases its solubility while the presence of any alkali hydroxide reduces its solubility. it has a ph of 9–9.5. it is the primary source of lime (calcium oxide) which is made by heating limestone in a furnace. calcium carbonate is used as a filler in baking powder, for calcium enrichment, as a mild buffering agent in doughs, as a source of calcium ions in dry mix desserts, and as a neutralizer in antacids. it is also termed limestone.

Uses

Made by adding soluble carbonate to a calcium salt solution. The white powder or crystals are soluble in acid but not in water. Calcium carbonate was used to neutralize gold toning baths and as a fine abrasive added to water and alcohol for cleaning glass plates before they were coated with photographic binders.

Uses

Manufacture of paint, rubber, plastics, etc.

Production Methods

Calcium carbonate is obtained from natural limestone deposits. The purified compound, known as precipitated calcium carbonate, is synthesized from limestone. Limestone is calcined to calcium oxide and carbon dioxide in a kiln. The products are recombined after purification. Calcium oxide is hydrated  with water to give a slurry called milk of lime, which is then carbonated by bubbling CO2 through it. The reactions involved in the process are as follows:
CaCO3 CaO + CO2
CaO + H2O Ca(OH)2
Ca(OH)2+ CO2→CaCO3+ H2O
The crystal sizes required for various commercial applications may be controlled by temperature, pH, concentrations, and mixing rate.
Calcium carbonate also may be precipitated by mixing solutions of calcium chloride and sodium carbonate.

Definition

ChEBI: A calcium salt with formula CCaO3.

Reactions

Calcium carbonate decomposes to calcium oxide and CO2 on heating. Treatment with dilute mineral acids produces corresponding calcium salts with liberation of CO2:
CaCO3+ 2HCl →CaCl2+ H2O + CO2
In the presence of CO2 it dissolves in water with the formation of bicarbonate:
CaCO3+ H2O + CO2→Ca2++ 2HCO3 ¯
It is reduced to calcium carbide when heated with coke or anthracite in an electric furnace:
2CaCO3+ 5C→(high temperature)→2CaC2+ 3CO2

brand name

Cal-Sup (3M Pharmaceuticals); Children’s Mylanta Upset Stomach Relief (Johnson & Johnson-Merck Consumer); Chooz (Schering- Plough HealthCare); Mylanta Soothing Lozenges (Johnson & Johnson-Merck Consumer).

Calcium carbonate Preparation Products And Raw materials

Raw materials

Preparation Products


Calcium carbonate Suppliers

Global( 358)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Shenzhen Sendi Biotechnology Co.Ltd.
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0755-23311925 Abel@chembj.com CHINA 3218 55
Henan Tianfu Chemical Co.,Ltd.
0371-55170693
0371-55170693 info@tianfuchem.com CHINA 20795 55
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86-0551-65418684 18949823763
86-0551-65418684 info@tnjchem.com China 1582 55
Shanghai Zheyan Biotech Co., Ltd.
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021-51821727 shenlinxing@macklin.cn China 15835 55
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86-21-63290778 86-21-63218885 sj_scrc@sinopharm.com China 9975 79
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Calcium carbonate Spectrum


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