When preparing NaCl from wastewater, the crystal particles are too fine, making filtration difficult; a good crystallizer is needed
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When we prepare NaCl from distilled wastewater, the crystal particles are too fine, making filtration difficult; we need a good crystallizer! Currently, salt is produced using thin-film evaporation, with an output of 15 tons per day.
What type of centrifuge is being used, and what is the pore size of the filter screen? What is the discharge concentration? Is a thickener installed?
Thank you! A horizontal scraper-type automatic discharge centrifuge is used; the filter screen currently has a mesh size of 300, and the solid content is around 40%. After the film is scraped off, there are two 1 m3 tanks, but they do not function properly.
①Generally, the discharge concentration of sodium chloride material should be at least 43–45%; at this point it is supersaturated and exists in the form of nuclei. For crystals to grow and precipitate, these nuclei must pass through a thickener, meaning that the thickener must operate properly； ②Scraper-type centrifuges function properly for separation only in conditions with 15% or more solids; it is likely that the abnormal operation of your reactor is the cause ；