Methods for removing calcium using mirabilite
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This post was last edited by Du Xiaoping on 2015-9-6 20:05. Seeking advice from experts on methods for removing calcium using sodium sulfate?
This post was last edited by yjqin1 on 2015-9-6 17:29. Your question provides the responder with several possible paths. Are you asking whether 1) there is calcium sulfate (or calcium carbonate) in the solid sodium sulfate? 2) Are there calcium ions in the sodium sulfate aqueous solution? In the second case, an appropriate excess of sodium carbonate is added to precipitate calcium carbonate, followed by filtration, ultrafiltration, and so on ； Then, use sulfuric acid to lower the pH to around 5-6, and blow out the carbon dioxide with air; that’s about it – the concentration can be reduced to around 1 mg/L. If it is necessary to reduce it to below 0.001 mg/L, chelating resins can be used again. If the mirabilite solid product contains calcium ions, then it is necessary to start with the material solution, following the same steps.
Many times, when posting a thread, the original poster fails to explain their process clearly and goes straight to the point; many conditions and details are not addressed, which leaves everyone confused. As a result, people express their own opinions and views, leading to diverse opinions. It’s obvious that the original poster made the same mistakes when posting this thread.