Calcium carbonate is a chemical compound with the formula CaCO3. It
is a common substance found in rocks as the minerals calcite and
aragonite (most notably as limestone, which is a type of
sedimentary rock consisting mainly of calcite) and is the main
component of pearls and the shells of marine organisms, snails, and
eggs. Calcium carbonate is the active ingredient in agricultural
lime and is created when calcium ions in hard water react with
carbonate ions to create limescale. It is medicinally used as a
calcium supplement or as an antacid, but excessive consumption can
Calcium carbonate chunks from clamshell
Eggshells, snail shells and most seashells are predominantly
calcium carbonate and can be used as industrial sources of that
chemical.Oyster shells have enjoyed recent recognition as a source
of dietary calcium, but are also a practical industrial source.
Dark green vegetables such as broccoli and kale contain dietarily
significant amounts of calcium carbonate, however, they are not
practical as an industrial source.
Calcium carbonate is one of the earliest and largest fillers used
in the rubber industry. Calcium carbonate is filled in rubber in
large quantities, which can increase the volume of the product,
thereby saving expensive natural rubber and reducing costs. Calcium
carbonate can be obtained by filling rubber. Pure rubber sulphide
has higher tensile strength, tear strength, and a significant
reinforcing effect in natural rubber and synthetic rubber, while
adjusting the consistency.
The main use of calcium carbonate is in the construction industry,
either as a building material, or limestone aggregate for road
building, as an ingredient of cement, or as the starting material
for the preparation of builders' lime by burning in a kiln.
However, because of weathering mainly caused by acid rain,calcium
carbonate (in limestone form) is no longer used for building
purposes on its own, but only as a raw primary substance for
Calcium Carbonate is an important and widely used inorganic salt
with the chemical formula caco3 , carbonic acid
Calcium is non-toxic, odorless, non-irritating, usually white, and
has a relative density of 2. 7 to 2. 9 . The crystal body mainly
has three sides
Calcite and orthorhombic aragonite are stable at normal temperature
and pressure, and aragonite is quasi-stable.
Mainly based on calcite.
At normal pressure, calcite is heated to 898 °C and aragonite is
heated to 825 °C, which will decompose into calcium oxide and
Calcium reacts with all strong acids to form water and the
corresponding calcium salts (such as calcium chloride CaCl2) while
releasing carbon dioxide;
At a temperature of (25 °C), the concentration of calcium carbonate
in water is 8. 7 × 1029, and the solubility is 0. 0014. The pH of
the aqueous calcium carbonate solution.
The value of the pH of the aqueous saturated calcium carbonate
solution is 8. 0~8. 6 .