1 Industrial applications: used in the manufacture of iron salts, inks, used as coal dyes, tannins, bleaching agents, water purifiers , wood preservatives and disinfectants . 2 Agricultural applications: used as fertilizers, herbicides and pesticides, to treat wheat smut , prevent orchard pests and fruit tree rot , and root moss and lichens of tree stalks. It can also be used as waste, it is a catalyst for plants to produce chlorophyll , and plays an important role in plant absorption. 3 pharmaceutical applications: as a topical pharmaceutically astringent and tonic agents, it is the iron-containing material synthesized in vivo red blood cells.

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