I would like to ask the experts on Haichuan: the reasons for the excessive sulfate content in 32% finished caustic soda, and the corresponding treatment measures.
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The sulfate concentration in the saline solution is 6.5 g/l; is there any connection between the two?
The excessive sulfate content in the finished alkali mainly comes from the salt water; this is likely due to poor efficiency of the ion exchange membrane. The sulfate level in salt water should be ≤8 g/l, and such a level has no impact on the sulfate content in the finished alkali.
Our Asahi Kasei cells are currently undergoing membrane and cell replacement. After the sulfate level in the finished caustic soda was found to be too high, samples were taken from each cell for analysis; the SO4 levels were high in both new and old cells, so it is likely a problem with the brine. Plan to reduce the SO4 level in the brine solution to below 5g and then see.
Can the sulfate ions at the cathode pass through?