Ferric trichloride is an important water treatment agent with good purity and high iron content. Ferric chloride can not only remove impurities in water, but also help coagulation and flocculation. It is a common water purification agent.

When ferric chloride is used in water treatment, it will react with hydrogen sulfide, phosphate, hydroxide and other alkaline substances in water to form precipitate. However, in the treatment of domestic water, ferric chloride is mainly hydrolyzed in water to form ferric hydroxide colloid with flocculation, which produces very good water purification effect. Ferric hydroxide, the hydrolysate of ferric trichloride, generally has a large number of positive charges. In industrial wastewater treatment, it can be well combined with the negatively charged particles in wastewater to form large alum and precipitate. In the treatment of industrial wastewater, ferric chloride has good effect on the treatment of raw water with low oil content, and the price is cheap. However, the wastewater after ferric trichloride treatment has a certain amount of iron ions, which will cause the water body to turn yellow.

Ferric chloride not only has a good effect in water treatment, but also has a good effect in the detection of metal industry, the production of circuit board in electronic industry, and the preparation of concrete in construction industry. Ferric chloride is an important industrial ferric salt, which is widely used in industrial production and plays an irreplaceable role.