Regarding the issue of brine purification
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I would like to ask the experts here a question: Our company currently produces alkali using the all-halide process, and in the purification of brine, we follow a process that involves removing ammonia first, followed by calcium. However, during the production process, the high levels of inorganic ammonia and calcium result in excessive free chlorine in the system after ammonia removal, which affects calcium removal and also leads to high consumption of sodium sulfite. I would like to ask the experts: Is it feasible to remove calcium first and then ammonia? Are there any cases in the industry?
OP, what type of ammonia removal process do you use? Personally, I believe it is not feasible to remove calcium first and then ammonia, as the addition of hyposodium and sodium hydrosulfite during ammonia removal will inevitably introduce impurities, which can affect subsequent electrolysis processes.
At present, in addition to the ammonia removal process, we use sodium hypochlorite and sodium hydroxide; ammonia is then removed at 55–65°C through a blower-based removal method
This post was last edited by dengfree on 2020-7-8 at 19:27. You’ve raised a great question; you can try removing ammonia after preprocessing