Sodium carbonate Dense (Soda Ash)

Hscode: 283620 Chemical formula: Na2-C-O3 CAS Nu: 497-19-8 UN Nu: NA Hazard Class: NA Synonyms: Crystal Carbonate, Disodium Carbonate, Sal Soda, Soda Asha, Washing Soda

Dense soda ash, also known as sodium carbonate (Na2CO3), is a crystalline white powder that

shares similar chemical properties with light soda ash. However, it differs in terms of its density

and particle size. Dense soda ash has a higher density and larger particle size compared to light

soda ash. Here are some key points about dense soda ash:


  1. Chemical Composition: Dense soda ash has the same chemical formula as light soda

ash, Na2CO3, indicating that it consists of two sodium (Na) atoms, one carbon (C) atom,

and three oxygen (O) atoms.

  1. Production: The production of dense soda ash is also commonly carried out through the

Solvay process, which involves the reaction of sodium chloride (salt) with ammonia and

carbon dioxide. This process results in the formation of dense soda ash as a solid


  1. Physical Properties: Dense soda ash appears as a dense, granular or crystalline powder

with a higher density than light soda ash. It typically has a density of around 2.5 to 2.6

grams per cubic centimeter.

  • Glass Manufacturing: Dense soda ash is a crucial component in the production of glass, especially container glass and flat glass. It helps to lower the melting point of silica and other ingredients, facilitating the glass-making process.

  • Chemical Manufacturing: It is used as a raw material and an alkaline agent in various chemical manufacturing processes, including the production of detergents, soaps, paper, textiles, and dyes.

  • Water Treatment: Dense soda ash is utilized in water treatment plants to adjust the pH of water, neutralize acidity, and aid in the removal of certain impurities.

  • Mining and Metallurgy: In mining operations, dense soda ash is employed to adjust the pH of solutions and control the precipitation of metals during mineral processing. It also finds applications in metal refining and smelting processes.

  • pH Regulation: Similar to light soda ash, dense soda ash is used for pH adjustment in swimming pools, soil treatment, and other applications where pH control is necessary.

  • Safety Considerations: Dense soda ash is generally considered safe to handle and use. However, it is advisable to follow appropriate safety precautions, such as wearing protective gloves and goggles, to avoid eye or skin irritation. Ingestion or inhalation of large amounts can be harmful, so it is important to handle it responsibly.

Chemical composition Unit Min Max
Sodium carbonate (Na2CO3) % Wt. 98.9 99.2
Sodium chloride (Nacl) % Wt. 0.3 0.5
Sodium bicarbonate (NaHCO3) % Wt. 0.1 0.5
Sodium sulfate (Na2So4) % Wt. 0.05
Iron (Fe) ppm 30 50
Loss on Heat % Wt. 0.2
MOISTURE % Wt. 0.2
Ni ppm 30
Cr ppm 10
Mn ppm 10
Cu ppm 65
Chemical composition UNIT MIN MAX
Total Alkalinity (Na2O) %Wt. 57.85 58.42
Pouring density g/cm³ 0.90 1.0
Mesh <49 %wt. —- 40
40-140 —- 59
>140 —– 1
Remarks: This report is according to the average of analyzed samples.

Acceptable limits are according to the ISIRI 614_1.


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