Calciumcarbonat Produkt Beschreibung
- Englisch Name:Calcium carbonate
- Synonyma:Calciumcarbonat;Carbonsäure Calciumsalz
Calciumcarbonat physikalisch-chemischer Eigenschaften
- Schmelzpunkt: :825 °C
- Dichte :2.93 g/mL at 25 °C(lit.)
- Brechungsindex :1.6583
- storage temp. :Store at RT.
- Löslichkeit :5 M HCl: 0.1 M at 20 °C, clear, colorless
- Aggregatzustand :random crystals
- Farbe :White-beige to slightly beige-gray
- Wichte :2.93
- PH :9.5-10.5 (100g/l, H2O, 20℃)(slurry)
- Wasserlöslichkeit :Insoluble
- maximale Wellenlänge (λmax) :λ: 260 nm Amax: ≤0.09
λ: 280 nm Amax: ≤0.06
- Merck :14,1657
- BRN :8008338
- Solubility Product Constant (Ksp) :pKsp: 8.54
- Stabilität: :Stable. Incompatible with acids, fluorine, ammonium salts, alum.
- InChIKey :VTYYLEPIZMXCLO-UHFFFAOYSA-L
- CAS Datenbank :471-34-1(CAS DataBase Reference)
- EPA chemische Informationen :Carbonic acid calcium salt (1:1)(471-34-1)
Calcium carbonate Chemische Eigenschaften,Einsatz,Produktion Methoden
- ERSCHEINUNGSBILD GERUCHLOSES, GESCHMACKLOSES PULVER ODER KRISTALLE.
- CHEMISCHE GEFAHREN Zersetzung beim Erhitzen auf 825°C unter Bildung ätzender Rauchemit Calciumoxid. Reagiert mit Säuren, Aluminiumund Ammoniumsalzen.
TLV nicht festgelegt.
MAK nicht festgelegt.
- AUFNAHMEWEGE Aufnahme in den Körper durch Inhalation.
- LECKAGE Verschüttetes Material in Behältern sammeln. Persönliche Schutzausrüstung: Atemschutzgerät, P1-Filter für inerte Partikel.
R37/38:Reizt die Atmungsorgane und die Haut.
R41:Gefahr ernster Augenschäden.
R36/38:Reizt die Augen und die Haut.
R36:Reizt die Augen.
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S36/37/39:Bei der Arbeit geeignete Schutzkleidung,Schutzhandschuhe und Schutzbrille/Gesichtsschutz tragen.
S37/39:Bei der Arbeit geeignete Schutzhandschuhe und Schutzbrille/Gesichtsschutz tragen.
- Aussehen Eigenschaften CaCO3; Kreide, Mamor, Kalk. Weißes Pulver ohne Geruch.
- Gefahren für Mensch und Umwelt Reizt die Augen.
- Schutzmaßnahmen und Verhaltensregeln Geeignete Schutzhandschuhe als kurzzeitiger Staubschutz.
Verhalten im Gefahrfall
Trocken aufnehmen. Der Entsorgung zuführen.
Auf Umgebung abstimmen.
Nach Hautkontakt: Abwaschen.
Nach Augenkontakt: Mit reichlich Wasser bei geöffnetem Lidspalt mindestens 10 Minuten ausspülen. Bei Beschwerden Augenarzt hinzuziehen.
Nach Einatmen: Frischluft.
Nach Verschlucken: Beim Verschlucken größerer Mengen viel Wasser nachtrinken und bei Unwohlsein Arzt konsultieren.
Nach Kleidungskontakt: Kontaminierte Kleidung ausklopfen und waschen.
Ersthelfer: siehe gesonderten Anschlag
- Sachgerechte Entsorgung Als feste Laborchemikalienabfälle.
- Beschreibung 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.
- Chemische Eigenschaften 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.
- Chemische Eigenschaften White or almost white powder.
- Chemische Eigenschaften Calcium carbonate occurs as an odorless and tasteless white powder or crystals.
- Physikalische Eigenschaften Calcium carbonate is a naturally occurring compound found in organisms and throughout the earth’s crust. After quartz, calcium carbonate, primarily in the form of calcite, is the most common mineral found in the crust. Geologically, calcium carbonate exists in several mineral forms: calcite, aragonite, and vaterite. Calcite is the most common calcium carbonate mineral, whereas vaterite is a very rare form. The different mineral forms of calcium carbonate are based on their crystalline structure. The form of calcium carbonate depends on the conditions at its formation such as temperature and pressure.
Calcium carbonate has the molecular formula
of CaCO3and the molecular weight of 100.0924 g/mol.
It is a common substance found in rock in all parts of
the world, and is the main component of the shells of
many marine organisms such as snails and conches. It
is the main ingredient in eggshells of birds and pearls
obtained from oysters.
Calcium carbonate is the active ingredient in “limestone” used as “agricultural lime” and is the principal cause of “hard water” since most subterranean streams used for fresh water come from wells where underground water flows through limestone beds which are eroded due to its passage. Calcium carbonate occurs in nature as limestone in various forms, such as marble, chalk, and coral.
- Physikalische Eigenschaften Limestone is a very common sedimentary rock of biochemical origin. It is composed mostly of the mineral calcite. Sometimes it is almost pure calcite, but most limestones are filled with lots of other minerals and sand and as such are called dirty limestones.
Humans primarily use calcium carbonate as a primary source of calcium to combat osteoporosis. Most limestone is used today as construction material. In addition to its use as a construction material, calcium carbonate is also used in numerous industrial processes. Two forms commonly used are ground calcium carbonate (gcc) and precipitated calcium carbonate (pcc).
Calcium carbonate is used widely in papermaking as filler and coating pigment to whiten paper. Calcium carbonate is used in place of more expensive optical brightening agents in paper and as a fill to replace more expensive wood pulp fiber; it also helps control the pH in an alkaline range.
The second most common industrial use of calcium carbonate (after papermaking) representing the largest use of gcc is in the production of plastics. It is used in the production of polyvinyl chloride (PVC), thermoset polyesters, and polyolefins. Calcium carbonate can be used to replace resins that are more expensive. Similar to its use in the paper industry, it is used as an optical brightener and whitening agent. It also is used to increase strength and absorb heat during exothermic processes.
Calcium carbonate is also used in the production of polyethylene and polypropylene. It is an additive to paints and coatings for several purposes including particle size distribution, opacity control, weather resistance, pH control, and anticorrosion. Calcium carbonate is used to buff er acidic soils.
Calcium carbonate has also been used to mitigate the effects of acid precipitation on water bodies. Another environmental application of calcium carbonate is for gas desulfurization in scrubbers used to reduce sulfur emissions from air pollution sources.
- Verwenden Manufacture of paint, rubber, plastics, etc.
- Verwenden 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.
- Verwenden 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.
- Verwenden Calcium carbonate 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 is also used to produce quicklime, hydrated lime and a number of calcium compounds.
- Verwenden Limestones are important rocks. They can be used for building materials but are not quite as strong as sandstone and are easily weathered by acidic conditions. Limestones are the primary source of lime for cements. Cement is considered one of the most important construction materials ever invented by man. Limestone can be crushed and used as road ballast. Significant quantities of limestone are quarried around the world for these purposes.
- Definition calcium carbonate: A white solid,CaCO3, which is only sparingly solublein water. Calcium carbonatedecomposes on heating to give calciumoxide (quicklime) and carbondioxide. It occurs naturally as theminerals calcite (rhombohedral; r.d.2.71) and aragonite (rhombic; r.d.2.93). Rocks containing calcium carbonatedissolve slowly in acidifiedrainwater (containing dissolved CO2)to cause temporary hardness. In thelaboratory, calcium carbonate is precipitatedfrom limewater by carbondioxide. Calcium carbonate is used inmaking lime (calcium oxide) and isthe main raw material for theSolvay process.
- synthetische Calcium carbonate may also be produced by mixing solutions of calcium chloride and sodium carbonate. In some cases, the presence of sodium is objectionable so that the ammonium carbonate salt is preferable.
- Vorbereitung Methode Precipitated calcium carbonate is made by subjecting calcium carbonate to processes in order to produce a product with specific characteristics with respects to form (calcite or aragonite), size, and properties. Precipitated calcium carbonate is made by heating (calcining) limestone to calcium oxide (lime, CaO) at temperatures between 600℃and 900℃: CaCO3(s)→ CaO(s) + CO2(g). Calcium oxide is then slacked with water to produce calcium hydroxide (Ca(OH)2): CaO(s) + H2O(l) → Ca(OH)2(aq). The calcium hydroxide is then combined with carbon dioxide, which is produced when the limestone is calcined, to give a suspension of calcium carbonate and water: Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O(l). The calcium carbonate produced in the last step is separated by filtration and various other separation methods to give precipitated calcium carbonate. By modifying the process of making pccusing different temperatures and limestone sources, numerous forms of calcium carbonate that vary in structure, size, and properties can be made for various applications.
- Vorbereitung Methode Calcium carbonate is prepared by double decomposition of calcium chloride and sodium bicarbonate in aqueous solution. Density and fineness are governed by the concentrations of the solutions. Calcium carbonate is also obtained from the naturally occurring minerals aragonite, calcite, and vaterite.
- Definition ChEBI: A calcium salt with formula CCaO3.
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.
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
- Trademarks 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 (CaCO3) can be found in clinical applications such as antacids, but not that an excessive intake can be hazardous.
A variety of calcium salts are used for clinical application, including calcium carbonate, calcium chloride, calcium phosphate, calcium lactate, calcium aspartate and calcium gluconate. Calcium carbonate is the most common and least expensive calcium supplement. It can be difficult to digest and may cause gas in some people because of the reaction of stomach HCl with the carbonate and the subsequent production of CO2.
Calcium carbonate is recommended to be taken with food, and the absorption rate in the intestine depends on the pH levels. Taking magnesium salts with it can help prevent constipation. Calcium carbonate consists of 40% Ca2+, which means that 1000 mg of the salt contains around 400 mg of Ca2+. Often, labels will only indicate the amount of Ca2+ present in each tablet and not the amount of calcium carbonate.
Calcite or crystalline calcium carbonate (CaCO3), is used
for liming acidic soils. It is a dominant source of calcium
in both arid and semi-arid soils.
Calcite crystallizes as a colorless or white crystalline material in a rhombohedral system with a hardness of 3 on the Mho scale. It exhibits the double refraction property, which is apparent in icelandspar, the transparent variety of calcite.
Calcite is very slightly soluble in water and is a major constituent of limestone, marbles and carbonates. It gives brisk effervescence with hydrochloric acid (HCl) and is sometimes used for bonding materials. The depth to which free CaCO3 leaches out is a measure of the depth of true leaching and the thickness of the solum.
Calcite is the main source of quicklime and hydrated lime or slaked lime. It is widely used as a metallurgical flux to scavenge siliceous impurities by forming a slag in smelting furnaces. It provides the essential calcium oxide component in common glasses and cement.
Calcium carbonate (CaCO3) is a naturally occurring
white solid that is sparingly soluble in water. It is most
commonly used to neutralize soil acidity to the required
level in a process called liming.
The major sources of calcium carbonate are calcitic limestone, dolomitic limestone, marl, chalk and marble. Calcium carbonate is made by passing carbon dioxide (CO2) into limewater. Pure calcium carbonate is assumed to have a 100% neutralizing value. The values of other liming materials are measured against the neutralizing value of pure calcium carbonate. Calcium carbonate, on heating, decomposes to give calcium oxide (quick lime) and carbon dioxide.
Limestone, which consists mainly of calcium carbonate, is called calcitic limestone or high calcium limestone. Limestone containing more than 10% magnesium carbonate is called dolomitic limestone or dolomite. These forms contain about 12% magnesium. Agricultural dolomitic limestone is a fine, grey to white powder of a double carbonate of calcium and magnesium with 12.8% magnesium and 17% calcium. The double carbonate is much less soluble in water than the individual carbonates.
Calcium carbonate, employed as a pharmaceutical excipient, is
mainly used in solid-dosage forms as a diluent. It is also used as
a base for medicated dental preparations, as a buffering agent,
and as a dissolution aid in dispersible tablets. Calcium carbonate is
used as a bulking agent in tablet sugar-coating processes and as an
opacifier in tablet film-coating.
Calcium carbonate is also used as a food additive and therapeutically as an antacid and calcium supplement.
Calcium carbonate is mainly used in oral pharmaceutical formulations
and is generally regarded as a nontoxic material. However,
calcium carbonate administered orally may cause constipation and
flatulence. Consumption of large quantities (4–60 g daily) may also
result in hypercalcemia or renal impairment. Therapeutically, oral
doses of up to about 1.5 g are employed as an antacid. In the
treatment of hyperphosphatemia in patients with chronic renal
failure, oral daily doses of 2.5–17 g have been used. Calcium
carbonate may interfere with the absorption of other drugs from the
gastrointestinal tract if administered concomitantly.
LD50 (rat, oral): 6.45 g/kg
- Lager Calcium carbonate is stable and should be stored in a well-closed container in a cool, dry place.
- Inkompatibilitäten Incompatible with acids and ammonium salts.
- Regulatory Status GRAS listed. Accepted for use as a food additive in Europe. Included in the FDA Inactive Ingredients Database (buccal chewing gum, oral capsules and tablets; otic solutions; respiratory inhalation solutions). Included in nonparenteral medicines licensed in the UK. Included in the Canadian List of Acceptable Non-medicinal Ingredients.
Calcium carbonate Upstream-Materialien And Downstream Produkte
- 1,3-Diphenylaceton Dinatrium-4-amino-3-[[4'-[(2,4-diaminophenyl)azo][1,1'-biphenyl]-4-yl]azo]-5-hydroxy-6-(phenylazo)naphthalin-2,7-disulfonat Calciumdiformiat Calciumbis(2-(1-carboxylatoethoxy)-1-methyl-2-oxoethyl)distearat Calciumdihexa-2,4-dienoat 2-Hydroxy-4-methylbenzolsulfonsure Calciumbromid DL-Apfelsure Calciumnitrat Polymyxin B, N-Sulfomethylderivat, Natriumsalz Wollastonit (Ca(SiO3)) Calciumdipropionat 7-Aminonaphthalin-1,3,5-trisulfonsure Strontiumsulfat Natriumnaphthalin-2-sulfonat 4-Anilino-3-nitro-N-phenylbenzolsulfonamid Tricalciumdicitrat (4-(4-Aminophenyl)(4-iminocyclohexa-2,5-dienyliden)methyl)-2-methylanilinhydrochlorid Cycloserin Butan-1,2,4-triol 1-Hydroxybutan-2-on Dinatrium-7-hydroxy-8-[[4-[1-[4-[(4-hydroxyphenyl)azo]phenyl]cyclohexyl]phenyl]azo]naphthalin-1,3-disulfonat
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471-34-1, Calcium carbonate Verwandte Suche:
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- CI 77220
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