Ferrous sulfate is a common chemical reagent in daily life, which is generally divided into anhydrous ferrous sulfate and ferrous sulfate heptahydrate. Anhydrous ferrous sulfate is mostly white powder or granular, which is made by drying ferrous sulfate heptahydrate. Therefore, the price is slightly higher than ferrous sulfate heptahydrate, but anhydrous ferrous sulfate is better than ferrous sulfate heptahydrate in all aspects.

The content of anhydrous ferrous sulfate is higher than that of ferrous sulfate heptahydrate, generally between 98% and 99%, while the content of ferrous sulfate heptahydrate is only between 85% and 90%. Although the price of anhydrous ferrous sulfate is higher than that of ferrous sulfate heptahydrate, the flocculation effect is better. When anhydrous ferrous sulfate is used for water treatment, it has the advantages of large flocculation amount, fast settling speed, and good removal of sulfide and phosphate.

Anhydrous ferrous sulfate has the advantages of long shelf life, generally about 1 year, no caking and moisture absorption. Compared with ferrous sulfate heptahydrate, its shelf life is only 1 to 3 months. Anhydrous ferrous sulfate can be used as soil conditioner, battery raw material, preservative, disinfectant, catalyst and so on.

Therefore, in daily life and production, anhydrous ferrous sulfate has better use effect and scope.