General
- Sodium silicate, also known as
water glass or liquid glass, available in aqueous solution and in solid
form, is a compound used in cements, passive fire protection, refractories,
textile and lumber processing.
- Sodium silicates are solids where the
proportion between silicon, oxygen and sodium determines what will be the
resulting silicate(s). They are based on the silicone atom ability to
coordinate four oxygen atoms in a tetraeder.
Process
The major process steps of manufacture of sodium silicate
are:
-
Mixing of soda ash and silica sand
-
Fusing of mixer in furnace for 12 to 16 hours at
about 1200 to 14000C
-
Drawing of fused melt into RCC Tank
-
Cooling by spraying of cold water
-
Dissolving of sodium silicate fragments with
preheater steam
-
Clarification/ setting of dissolved sodium silicate
to a desired gravity by mixing with
-
Hot water
- Packing in drums
Application
- Sodium Silicate find its application
in:
- Detergent Industry
- Civil Engineering
- Chemical grouting
- Ceramic Industry
- Paper and cardboard industry
Technology
-
A variety of solid-state NMR techniques were applied in
order to assign resonances in the 29Si and 23Na NMR spectra of a new
crystalline silicate to crystallographically distinct silicon and sodium
sites, respectively.
-
Rapid advances are occurring in core design and production
because of the need for reducing foundry and machining scrap and the need
for binders that are environmentally friendly.
Market
-
DEMAND
1999: 1,215 thousand short tons; 2000: 1,225
thousand short tons; 2004: 1,260 thousand short tons, projected. Demand
equals production plus imports (1999: 30 thousand s.t.; 2000: 44 thousand
s.t.) less exports (1999: 59 thousand s.t.; 2000: 49 thousand s.t.).
GROWTH
Historical (1995 - 2000): -0.3 percent per
year; future: 0.7 percent per year through 2004.
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