Desulfurization of flue gas from volatilization kilns using the sodium-alkali method to recover sodium sulfite
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At our factory, the flue gas from the volatilization kiln is desulfurized using the sodium-alkali method to recover sodium sulfite; however, the content of sodium sulfate in the resulting sodium sulfite product is quite high. How should this be addressed? The oxygen content in the flue gas reaches 20% – please advise
These are the problems associated with all sodium-alkali processes: sodium sulfite is prone to oxidation; it reacts with the oxygen in flue gas to form sodium sulfate. This phenomenon cannot be avoided, but it can be reduced by taking certain measures. Common approaches include improving the absorption efficiency and reducing the liquid-to-gas ratio. Additionally, oxidizing agents such as p-phenylenediamine and hydroquinone can be added, in amounts of about one part in 100,000, to reduce the oxidation of sodium sulfite.