Ferrous sulfate, green vitriol, commonly known as green vitriol, is an inorganic compound. When heated to 70 degrees Celsius, 3 crystal waters will be lost and ferrous sulfate tetrahydrate will be produced; when heated to 75 degrees Celsius, 4 crystal waters will be lost and ferrous sulfate trihydrate will be produced; when heated to 80~123 degrees Celsius, 6 crystals will be lost. Water produces ferrous sulfate monohydrate; ferrous sulfate is mainly used to make iron salts, inks, magnetic iron oxides, water purifiers, disinfectants, iron catalysts; used as coal dyes, tanning agents, bleaching agents, Wood preservatives and compound fertilizer additives, as well as processing of ferrous sulfate monohydrate, etc. Drying grade ferrous sulfate (the content of ferrous sulfate heptahydrate is between 95-99%)
Drying ferrous sulfate includes: ferrous sulfate tetrahydrate, ferrous sulfate trihydrate, ferrous sulfate monohydrate

Application fields of ferrous sulfate
1. Water treatment Ferrous sulfate is used for flocculation and purification of water, and for removing phosphate from urban and industrial sewage to prevent eutrophication of water bodies.
2. Reducing agent A large amount of ferrous sulfate is used as a reducing agent, mainly reducing chromate in cement.
3. Medicinal
a. Ferrous sulfate drugs are used to treat iron deficiency anemia; they are also used to add iron to food.
b. In medicine, it can also be used as a local astringent and blood tonic, and can be used for chronic blood loss caused by uterine fibroids.
4. Food or feed additive ferrous sulfate can be added to food, beverages, feed and other products to treat iron deficiency anemia.
5. Colorants
a. The production of iron tannate ink and other inks requires the use of ferrous sulfate. Ferrous sulfate is also contained in mordants for wood dyeing.
b. Ferrous sulfate can be used to dye concrete into a yellow rust color.
c. Carpenters use ferrous sulfate to dye maple wood with a silver color.
6. Agriculture regulates soil pH and promotes the formation of chlorophyll (also known as iron fertilizer), which can prevent and treat yellowing of flowers and trees caused by iron deficiency. It is an indispensable element for acid-loving flowers and trees, especially iron trees. In agriculture, it can also be used as a pesticide to prevent and treat wheat smut, scab of apples and pears, and fruit tree rot; it can also be used as a fertilizer to remove moss and lichen from tree trunks.
7. Analytical Chemistry Ferrous sulfate can be used as a chromatographic analysis reagent.
8. The production of lithium battery materials ferrous sulfate can produce iron phosphate, which is used in the production of lithium iron phosphate batteries.
9. Ferrous sulfate for pigment production can be used to make iron salts, iron oxide pigments, mordants, water purifiers, preservatives, disinfectants, etc.