1. Used for flocculation purification of water and phosphate removal from urban and industrial sewage to prevent eutrophication of water.
2, used as a reducing agent, mainly reducing the chromate in cement.
A. used in the production of iron tannic ink and other inks. Wood dyeing mordant also contains ferrous sulfate.
B. used to stain concrete to a yellow rust color.
C. wood workers use ferrous sulfate to color maple wood silver.
5, used to regulate the soil pH to promote the formation of chlorophyll (also known as iron fertilizer). can prevent flowers and trees due to lack of iron caused by the yellow disease. It is an indispensable element of acid-loving flowers and trees, especially sago Cycas. Also be used as pesticides to control wheat smut, apple and pear scab, fruit tree rot; It can also be used as fertilizer to remove moss and lichen from tree trunks.
6. used as chromatographic reagent.