Technical assistance: What are the quality requirements for quartz sand used in anion and cation exchange beds?
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This post was last edited by cdpulin on 2010-4-9 09:55. What are the quality requirements for quartz sand used in anion and cation exchange beds? Are there any relevant technical standards?
This post was last edited by cdpulin on 2010-4-9 at 09:55. OP, be sure to choose high-quality quartz sand; it’s best if it’s pickled. 32-16, 16-8, 8-4, 4-2, 2-0.5. One of my projects ran into problems because the quartz sand supplied by the procurement department was of substandard quality. Firstly, SiO2 does not react with acids (with the exception of HF). If impure SiO2 is used in the anion exchange resin, the regeneration liquid HCl will react with these impurities, resulting in the formation of white powdered precipitates (which may also be calcium salts that have detached from the quartz sand), along with a large amount of gas. It is estimated that HCl reacts with CaCO3 to produce CO2, H2O, and CaCl2; CaCl2 then reacts with CO2 to form CaCO3 again. Due to the limited concentration of HCl, it is not possible for it to react with all of the CaCO3, so most of the CaCO3 detaches from the SiO2. ), the anode bed is basically fine.