Preparation method of polyferric sulfate (PFS)
A technology for polymerizing ferric sulfate and persulfate, which is applied in the fields of ferric sulfate, flocculation/precipitation water/sewage treatment, etc., can solve the problems of increased process cost, waste of oxidant, complicated equipment structure, etc., and achieves easy control of the injection speed and suitable pH. Wide range of effects with simple operation process
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Embodiment 1
[0016] Taking ferrous sulfate as a soluble ferrous salt as an example, the method for preparing polyferric sulfate is: weigh 13.9g FeSO 4 Placed in a 250mL Erlenmeyer flask, add 50mL of distilled water to FeSO 4 The concentration is 56g / L, add 7.14 g Na 2 S 2 o 8 , FeSO 4 with Na 2 S 2 o 8 The molar ratio of 1:0.6 ensures that Fe in the solution 2+ with S 2 o 8 2- The molar ratio is 1:0.6, heated to 65°C in a water bath and stirred for 2 hours to obtain polyferric sulfate.
Embodiment 2
[0018] Taking ferrous sulfate as a soluble ferrous salt as an example, the method for preparing polyferric sulfate is: weigh 13.9g FeSO 4 Placed in a 250mL Erlenmeyer flask, add 50mL of distilled water to FeSO 4 The concentration is 56g / L, add 4.76g Na 2 S 2 o 8 , FeSO 4 with Na 2 S 2 o 8 The molar ratio was 1:0.4, and the reaction was stirred at 25°C for 3 hours to obtain polyferric sulfate.
Embodiment 3
[0020] Taking ferrous sulfate as a soluble ferrous salt as an example, the method for preparing polyferric sulfate is: weigh 13.9g FeSO 4 Placed in a 250mL Erlenmeyer flask, add 50mL of distilled water to FeSO 4 The concentration is 56g / L, add 9.52g Na 2 S 2 o 8 , FeSO 4 with Na 2 S 2 o 8 The molar ratio is 1:0.8, heated to 60°C in a water bath and stirred for 1 hour to obtain polyferric sulfate.
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