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| Light soda ash is a white, odorless, uniform product, free from dirt and other foreign matter. |
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| PHYSICAL & CHEMICAL PROPERTIES : |
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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 the total alkali content of the bag does not change. Soda ash has a tendency to cake when it comes in contact with moisture and, consequently, becomes lumpy. |
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| Chemical formula : Na2CO3 |
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| Characteristics |
IS 251 : 1998
specifications
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TCL-assured specifications |
Units |
| Molecular weight |
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106 |
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| Bulk density |
500 – 750 |
550 – 720 |
Kg/m3 |
Volatile matter content
(at the time of packing) |
2 |
0.80 |
%, max |
| Total alkalinity (as Na2CO3) |
98.5 |
99.0 |
%, min |
| Sulphates (as Na2SO4) |
0.08 |
0.03 |
%, max |
| Chlorides (as NaCl) |
1.0 |
0.80 |
%, max |
Iron
(as Fe2O3) |
By colorimetric method |
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0.0029 |
%, max |
| By spectrophotometric method |
0.007 |
0.002 |
| Matter insoluble in water |
0.15 |
0.03 |
%, max |
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Common salt and limestone are the raw materials that are processed and converted into light soda ash and calcium chloride.
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 individual needs of its customers. |
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| Light soda ash is one of the most important basic industrial chemicals. Light soda ash is used to regulate pH in many chemical process streams. The superior buffering capacity of soda ash versus caustic soda offers advantages in adjusting plant wastewater pH ranges. |
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| Soda ash is used as the sodium source for sodium sulfite/bi-sulfite pulping liquors used in the sulfite, CMP, and CTMP processes, and in NSSC pulping. |
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| It is also possible to replace a portion of the caustic soda in many pulp bleaching applications such as caustic extraction or hydrogen peroxide bleaching of mechanical or chemical pulps. However, the higher pH requirements of these applications may necessitate the continued use of some caustic soda. |
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| It is also possible to replace a portion of the caustic soda in many pulp bleaching applications such as caustic extraction or hydrogen peroxide bleaching of mechanical or chemical pulps. However, the higher pH requirements of these applications may necessitate the continued use of some caustic soda. |
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| In addition, it is the most widely used fixed alkali for the manufacture of other alkali products, sodium salts, glass, soap, sodium silicates, detergent, bicarbonates, bichromates, cellulose and rayon, iron and steel, aluminum, cleaning compounds, textiles and dyestuffs, drugs and many other materials. It is also used as an alkali for household purposes and as washing powder by laundries. |
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| Available in 50-kg HDPE / PP bags and 750-kg PP jumbo bags with lamination / liner. |
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Soda ash should be stored under cover in a cool, dry place and the bags should not be stacked more than 15 bags high. |
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