Kalkstein Chemische Eigenschaften,Einsatz,Produktion Methoden
R-Sätze Betriebsanweisung:
R37/38:Reizt die Atmungsorgane und die Haut.
R41:Gefahr ernster Augenschäden.
S-Sätze Betriebsanweisung:
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.
Beschreibung
Calcite is one of the most common minerals on the face of
the earth, comprising about 4% by weight of the earth’s
crust and is formed in many different geological environments.
Calcite can form rocks of considerable mass
and constitutes a significant part of all three major
rock classification types. It forms oolitic, fossiliferous
and massive limestones in sedimentary environments
and even serves as the internal cement for many sandstones
and shales.Calcite is even a major component in the igneous rock called carbonatite and forms the
major portion of many hydrothermal veins. Not necessarily
a variety of calcite, cave formations are certainly
a unique aspect of calcite’s story.
Chemische Eigenschaften
Calcium carbonate is a white, odorless
powder, or crystalline solid.
Verwenden
Source of lime; neutralizing agent, filler, and
extender in rubber, plastics, paints; opacifying agent
in paper; fortification of bread; putty; tooth pow-
ders; antacid; whitewash; Portland cement; sulfur
dioxide removal from stack gases; metallurgical
flux; analytical chemistry; carbon dioxide gener-
ation (laboratory).
synthetische
The calcite present is derived mostly from the remains of organisms
such as clams, brachiopods, bryozoa, crinoids and
corals. These animals live on the bottom of the sea and
when they die their shells accumulate into piles of shelly debris. This debris can then form beds of limestone.
Some limestones may have been derived from nonbiogenic
calcite formation.
Definition
Aragonite: An
anhydrous mineral form of calcium carbonate,
CaCO
3, which occurs associated
with limestone and in some metamorphic
rocks. It is also the main ingredient of
pearls. It is not as stable as calcite, into
which it may change over time.
Calcite:A mineral form of calcium
carbonate occurring in limestone,
chalk, and marble.
Charlk: A natural form of calcium carbonate
(CaCO
3) formed originally by marine
organisms. (Blackboard chalk is calcium
sulfate, CaSO
4.).
Allgemeine Beschreibung
Odorless, white to tan powder.
Reaktivität anzeigen
CALCIUM CARBONATE has generally low chemical reactivity. Is non-combustible. Decomposes at high temperature (825°C) to give gaseous carbon dioxide and calcium oxide (quicklime). Incompatible with acids, alum, ammonium salts, fluorine, magnesium. Reacts with acids and acidic salts to generate gaseous carbon dioxide with effervescence (bubbling). The reaction is rapid and exothermic with concentrated solutions of acids. The efferversence can create extensive foaming. Ignites on contact with fluorine.
Hazard
A nuisance particulate dust.
Health Hazard
Calcium carbonate is considered
to be a nuisance dust.
Although no adverse effects have been
reported in the literature among workers
exposed to calcium carbonate, high concentrations
of the dust would be expected to act as a
physical irritant to the eyes and skin.1 Fourteen
British workers exposed to heavy calcium carbonate
concentrations for 12–35 years showed
no trace abnormalities due to dust or any
clinical sign of pneumoconiosis or chronic
bronchitis on X ray.2 Long exposure to high
dust concentrations of pure calcium carbonate
(quartz content less than 1.1%) did not result
in lung fibrosis.
Landwirtschaftliche Anwendung
Limestone or dolomite, used in agriculture for liming the soil, is ground to a fineness to ensure that 50% of the particles pass through a 1.70mm Indian Standards (IS) sieve, and 50% is retained on a 150micron IS sieve.
Sicherheitsprofil
A nuisance dust. An
eye and skin irritant. Igmtes on contact with
F2. Incompatible with acids, ammonium
salts, (Mg + H2). Calcium carbonate is a
common air contaminant. See also
CALCIUM COMPOUNDS.
mögliche Exposition
Calcium carbonate is used as a source
of lime; neutralizing agent; manufacturing or rubber, plastics, paint and coatings; sealants, paper, dentifrices, ceramics, putty, polishes and cleaners, insecticides, inks and
cosmetics; whitewash; Portland cement; antacids; analytical
chemistry, and others
Inkompatibilitäten
Calcium carbonate decomposes in high
temperature forming carbon dioxide and corrosive
materials
Waste disposal
Landfills. It is the responsibility of chemical waste generators to determine if a discarded
chemical is classified as a hazardous waste. See 40 CFR
Parts 261.3 for United States Environmental Protection
Agency guidelines for the classification determination. In
addition, in order to ensure complete and accurate classification, waste generators must consult state and local hazardous waste regulations.
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