Granular ferrous sulfate
Ferrous sulfate particles are granular products made of powdered ferrous sulfate. It can be used as raw material of ferrous sulfate, ferrous sulfate and so on.
Application of granular ferrous sulfate
It is mainly used for water treatment, as coagulant, it has large coagulation particles, good water property of vegetables, fast sedimentation, good color removal effect, low cost of ferrous sulfate treatment agent, suitable for wastewater treatment with pH value above 8.5. It is widely used for flocculation, clarification and decolorization of printing and dyeing, papermaking, domestic sewage and industrial wastewater. Ferrous sulfate can also be used to treat wastewater containing chromium and cadmium. The treatment of wastewater with high alkalinity and high chroma can reduce the input of neutralization acid.
Generally, when using in water treatment, it is suggested that the concentration of ferrous sulfate solution should be about 10%. Soluble in water, easy to oxidize to yellow or rust color in wet air.
Mechanism of granular ferrous sulfate
Under acidic conditions, reducing agents such as ferrous sulfate, sodium sulfite, sodium bisulfite, sulfur dioxide are added to reduce hexavalent chromium to trivalent chromium, and then sodium hydroxide, calcium hydroxide and lime are added to adjust the pH value to form trivalent chromium hydroxide, which is separated from wastewater.
Advantages of granular ferrous iron:
It has the advantages of low price, good decolorization effect, large flocculent alum and fast settling speed. When used, 5% - 10% aqueous solution is prepared and added into raw water, and the pH value of raw water is adjusted to 9-11 with lime.