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Granular
soda ash, like other varieties of soda ash, is
a white, odourless, uniform product, free from
dirt and other foreign matter.
Physical
and chemical properties
Soda ash has a tendency to absorb moisture from
the atmosphere. The moist soda ash then starts
absorbing atmospheric carbon dioxide. This phenomenon
of absorption of moisture and carbon dioxide by
soda ash is known as weathering. After weathering,
soda ash is likely to contain appreciable moisture
and sodium bicarbonate, but its total alkali content
does not change. Soda ash has a tendency to cake
when it comes in contact with moisture and, consequently,
becomes lumpy.
Chemical
formula:
Na2CO3
O
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Structural formula: Na -- O -- C -- O --
NA
Common
names: Sodium carbonate, calcined soda, disodium
carbonate
Specification:
T. C. Specification
CAS
registry number: 497-19-8
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Characteristics
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IS
251 : 1998 specifications
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TCL-assured
specifications
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Units
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Molecular
weight
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106
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Bulk
density
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751
- 950
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751
- 950
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Kg/m3
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Volatile
matter content (at the time of packing)
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2
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0.80
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%,
max
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Total
alkalinity (as Na2CO3)
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98.5
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99.0
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%,
min
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Sulphates
(as Na2SO4)
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0.08
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0.03
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%,
max
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Chlorides
(as NaCl)
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1.0
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0.80
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%,
max
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Iron
(as Fe2O3)
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By
colorimetric method
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0.0029
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%,
max
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By
spectrophotometric method
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0.007
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0.002
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Matter
insoluble in water
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0.15
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0.03
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%,
max
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Manufacturing
process
Common salt and limestone are the raw materials
used in the manufacture of granular dense soda
ash. In the Solvay process, soda ash is manufactured
by dissolving salt in seawater. This is followed
by purification. The purified brine is ammoniated
and carbonated to get crude bicarbonate slurry,
which is filtered and calcined to get light soda
ash. This light soda ash is packed directly in
the auto silo. Tata Chemicals has tailored its
manufacturing process to meet the specific needs
of its customers.
Applications
Granular soda ash finds use in the steel industry
and is used in blast furnaces to remove sulphur
from iron ore. It imparts fluidity to the slag,
ensuring smooth and continuous operation of the
blast furnace. It is also used in jaggery-based
industries. Granular soda ash can be a substitute
for dense soda ash.
Packaging
Available in 50-kg HDPE / PP bags with lamination.
Storage
Soda ash should be stored under cover in a cool,
dry place and the bags should not be stacked more
than 15 bags high.
For
more information about this product or to place
orders, please contact:
ZN Langrana at:
znlangrana@tatachemicals.com
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