Preparation method 2 of polymeric ferric sulfate

Preparation method 2 of polymeric ferric sulfate

The preparation of polymeric ferric sulfate mainly includes direct oxidation method and catalytic oxidation method. Most PFS are prepared using direct oxidation method, which has a relatively simple process route and can reduce equipment investment and production links in industrial production, lowering equipment costs. However, this production process must rely on inorganic oxidants such as H2O2, KClO3, HNO3, etc. Catalytic oxidation method generally uses a catalyst to prepare polymeric ferric sulfate by oxidation with oxygen or air.

Potassium (sodium) chlorate oxidation method:
Potassium chlorate is a strong oxidant widely used in the explosives and match industries, which can also oxidize ferrous to trivalent iron
6FeSO4 + KClO3 + 3(1-n/2)H2SO4 —→ 3[Fe2(OH)n(SO4)3-n/2]+ 3(1-n)H2O + KCl
When preparing, add sulfuric acid, ferrous sulfate, and water in proportion to the reaction kettle, and add potassium chlorate while stirring at room temperature or slightly higher temperature. The test can be completed by reducing the concentration of ferrous ions to the specified level.
This method has a simple production process, low equipment investment, good product stability, high reaction efficiency, and no air pollution. The product contains chlorate, which can be used as both a coagulant and a fungicide. However, there are high levels of residual chloride ions and chlorate ions in the product, which are not suitable for drinking water treatment. Meanwhile, due to the high price of potassium chlorate, the product cost is high. B