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Why is sodium bicarbonate so effective ? |
The acid neutralisation using sodium bicarbonate involves in fact a stage of thermal activation: brought into contact with the hot flue gases, the sodium bicarbonate converts rapidly into sodium carbonate, with a high specific surface and porosity (see the electronic microscope photographs below).
2 NaHCO3 → Na2CO3 + CO2 + H2O
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Sodium bicarbonate prior to thermal activation : very smooth grain surface |
Sodium carbonate with a high specific surface after thermal activation of the sodium bicarbonate : highhly porous grain surface. |
The conversion of the sodium bicarbonate into 'activated carbonate' makes the NEUTREC® process an excellent way of neutralising acids (hydrochloric acid, sulphur dioxide, hydrofluoric acid, etc.) and absorbing heavy metals, dioxins and furans.
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