Listing Description:
Belite is an industrial mineral important in Portland cement manufacture. Its main constituent is
dicalcium silicate, Ca2SiO4, sometimes formulated as 2
CaO · SiO2 (C2S in cement chemist notation).
Detailed Description:
Composition and structure
The belite found in Portland cement differs in
composition from pure dicalcium silicate. It is a solid solution and contains
minor amounts of other oxides besides CaO
and SiO2. A typical composition:[3]
Oxide
|
Mass %
|
CaO
|
63.5
|
SiO2
|
31.5
|
Al2O3
|
2.1
|
Fe2O3
|
0.9
|
MgO
|
0.5
|
SO3
|
0.1
|
Na2O
|
0.1
|
K2O
|
0.9
|
TiO2
|
0.2
|
P2O5
|
0.2
|
Based on this, the formula can be expressed as Ca1.94Mg0.02Na0.01K0.03Fe0.02Al0.07Si0.90P0.01O3.93.
In practice, the composition varies with the bulk composition of the clinker, subject to certain
limits. Substitution of calcium ions or orthosilicate ions requires that
electric charges be kept in balance. For instance, a limited number of orthosilicate (SiO44−)
ions can be replaced with sulfate (SO42−)
ions, provided that for each sulfate ion, two aluminate (AlO45−)
ions are also substituted.
PRICE
$19.8/KG OR $9/IB
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