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Glass-making |
Sodium bicarbonate is effective at the high temperatures (400° - 450°C) often required in this type of installation.
The residual sodium chemicals from the gas cleaning process are homogenous, consisting mainly of sodium sulphate, and can be recycled in the process.
Sodium bicarbonate is also highly effective in removing sulphur dioxide (the main pollutant in glass furnaces).
Depending on their composition, we can distinguish several types of glass, essentially flat, rounded glass and special. The glass is produced by using the heat to melt the mixture of sand, sodium bicarbonate and network stabilisers.
The manufacturing of 'Calcic soda' glass gives off acid components and dust (mainly sulphur dioxide). Sodium bicarbonate can neutralise the acid components of polluted gases to within the legal emission limits.
The salt formed by this reaction has to be separated out of the gas using an electrofilter or a bag filter, depending on the required precipation performance and the temperature of the gases.
Using sodium bicarbonate, the residual sodium chemicals from the purification, consisting essentially of sodium sulphate, can be recycled in the melting furnace, thereby refining the raw glassmaking materials.
Performance of sodium bicarbonate:
Sodium bicarbonate is highly effective in precipitating sulphur dioxide (SO2) and hydrofluoric acid (HF).
Legislation
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