water treatment chemicals: zeolite 4a chemical use in america

water treatment chemicals: zeolite 4a chemical use in america
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  • What is 4A zeolite?
  • 4A zeolite, whose ideal chemical structure formula is Na 12 [ (AlO 2) 12 (SiO 2) 12 ]·27H 2 O, is a type of crystalline aluminium-containing silicate with homogeneous microchannels ( García et al., 2015; Shen et al., 2017 ).
  • Can 4A zeolite be synthesised from Owr?
  • As it is known, a study about the synthesis of 4A zeolite from OWR has not been reported. This work provides a new material for synthesis of 4A zeolite and a new method for the removal of ammonium ion. Importantly, a novel method to utilize OWR producing during palygorskite mine exploitation was achieved.
  • What is the effect of impurities on synthesis of 4A zeolite?
  • It is observed that, compared with natural OWR, the SiO 2 mass of OWR after acid leaching increases from 83.15 to 89.26% and impurities, such as MgO, Fe 2 O 3, CaO, also clearly decrease. In other words, the impact of impurities for synthesis of 4A zeolite is diminished. Figure 1 presents XRD patterns of raw OWR and purified OWR.
  • Why are zeolites used in water treatment?
  • The unique ion exchange and adsorption properties, high porosity and excellent thermal stability of zeolites make them very suitable for many applications, also in water treatment processes. Many different studies have demonstrated their effectiveness in reducing the concentrations of contaminants (heavy metals, anions and organic matter) in water.