Ferrous sulfate, commonly known as green vitriol, is a sulfate of iron consisting of sky-blue or green monoclinic crystals or crystalline powder. 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, cod removal in printing and dyeing wastewater, and for ferrite co-precipitation in electroplating waste.
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