It is mainly used as a water purifier for drinking water and a precipitant for wastewater treatment.It is used as an oxidant and mordant in dyeing and dyeing of indigo dye in printing and dyeing industry.Organic synthesis of dichloroethane and other production catalysts.Chlorination leaching agent for silver and copper ores.An etchant for photographic and printing platemaking. Raw materials for the manufacture of iron salts, medicines, pigments, and inks.It can increase the building strength, corrosion resistance and prevent water seepage when the solution is permeated into the building concrete.Used for electronic industry circuit board and fluorescent digital tube production.Coagulants in the recovery of glycerol from soap waste liquid.
Black-brown hexagonal crystal system
1 mm Hg ( 194 °C)
5.61 (vs air)
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