·
Linear Formula CaSiO3
·
Molecular Weight 116.16
Calcium silicate (often referred to by its shortened trade
name Cal-Sil or Calsil) is the chemical compound
Ca2SiO4, also known as calcium orthosilicate and
sometimes formulated 2CaO.SiO2.
Detailed description
It is one of a group of compounds obtained by reacting calcium oxide and silica in various ratios[4] e.g. 3CaO•SiO2, Ca3SiO5; 2CaO•SiO2, Ca2SiO4; 3CaO•2SiO2,
Ca3Si2O7 and CaO•SiO2, CaSiO3. Calcium silicate
is a white free-flowing powder derived from limestone and diatomaceous earth.
It has a low bulk density and high
physical waterabsorption. It is used in roads,
insulation, bricks, roof tiles, table
salt[5] and occurs in
cements, where it is known as belite (or in cement chemist notation C2S).
It is used as an anti-caking agent in food
preparation and an antacid. It is approved by
the United Nations' FAO and WHO bodies as a safe food additive in a large
variety of products.[
High temperature insulation
Calcium silicate is commonly used as a safe
alternative to asbestos for high
temperature insulation materials. Industrial grade piping and equipment
insulation is often fabricated from calcium silicate. Its fabrication is a
routine part of the curriculum for insulation apprentices. Calcium silicate
competes in these realms against rockwool as well as proprietary insulationsolids,
such as perlite mixture and vermiculite bonded
with sodium silicate.
Although it is popularly considered an asbestos substitute, early uses of
calcium silicate for insulation still made use of asbestos fibers.
Passive fire protection
One of the most successful materials in fireproofing in Europe is calcium silicate. Where North Americans use spray
fireproofing plasters, Europeans are more
likely to use cladding made of
calcium silicate.[why?] High
performance calcium silicate boards retain their excellent dimensional
stability even in damp and humid conditions and can be installed at an early
stage in the construction program, before wet trades are completed and the
building is weather-tight. For sub-standard products, silicone treated sheets
are available to fabricators to mitigate potential harm from high humidity or general
presence of water. Fabricators and
installers of calcium silicate in passive fire protection often also install firestops.
While the best possible Reaction to Fire
Classifications are A1 (construction applications) and A1Fl (flooring
applications) respectively, both of which mean "non-combustible"
according to EN 13501-1: 2007, as classified by a notified laboratory in
Europe, some calcium silicate boards only come with Fire Classification of A2
(limited combustibility) or even lower classifications (or no classification),
if they are tested at all.
Acid mine drainage remediation
Calcium silicate, also known as slag, is produced when molten iron is made from iron ore, silicon dioxide and calcium carbonate in a blast furnace. When this material
is processed into a highly refined, re-purposed calcium silicate aggregate, it
is used in the remediation of acid mine drainage (AMD)
on active and passive mine sites.[7] Calcium
silicate neutralizes active acidity in AMD systems by removing free hydrogen
ions from the bulk solution, thereby increasing pH.
As its silicate anion captures H+ ions (raising the pH), it
forms monosilicic acid (H4SiO4), a neutral solute.
Monosilicic acid remains in the bulk solution to play other important roles in
correcting the adverse effects of acidic conditions. As opposed to limestone (a
popular remediation material), calcium silicate effectively
precipitates heavy metals and does not armor over, prolonging its effectiveness
in AMD systems.
As a product of sealants
When sodium silicate is applied as
a sealant to cured concrete or the shells
of fresh eggs, it chemically
reacts with calcium hydroxide or carbonate to form calcium silicate hydrate,
sealing pores with a relatively impermeable material.
PRICE
$2085.52/KG OR $947.96/IB
For more information:
mobile: +2348039721941
contact person: emeaba uche
e-mail: emeabau@yahoo.com
No comments:
Post a Comment