Properties:

Ferrous sulfate, commonly known as green vitriol, is a sulfate of iron consisting of sky-blue or green monoclinic crystals or crystalline powder, with a relative density of 1.8987 and melting point of 64 °C; it is odorless and convergent and weathers when exposed to air, with the surface turning into a white powder; it is subject to oxidization in moist air, with a brown ferric subsulfate appearing on the surface; it is water glycerol soluble and insoluble in alcohol; ferrous sulfate is reductive and turns from a heptahydrate into a tetrahydrate at 56.6°C, and into a monohydrate at 64.6°C; it loses six crystal water molecules at 90°C, and all the crystal water molecules at 300°C, and decomposes to give off SO2 and SO3 in red hot state; it is also corrosive and fluoresces in dry air; its anhydride form is a white powder, which turns blue-green when reacting with water.

Product Use:

Ferrous sulfate is mainly used as a flocculant and has good flocculation and decolorization; it can also be used to remove heavy metal ions, oils, and phosphorus and for sterilization; it is particularly applicable for decolorization and COD removal in printing and dyeing wastewater, and for ferrite co-precipitation in electroplating waste; it is low cost and the first choice in treatment of printing, dyeing, and electroplating wastewater.

Ferrous sulfate can also be used as a food additive, pigment, raw material for the electronics industry, hydrogen sulfide deodorant, soil conditioner, and industrial catalyst. Technical indicators: