What is the main composition of ferric hydroxide and its harm to the environment?

Iron hydroxide has brown or reddish brown powder or dark brown flocculent precipitation, which is difficult to dissolve in water. Iron hydroxide residue can be divided into iron hydroxide colloid and iron hydroxide precipitation, and their physical properties are also different. Ferric hydroxide colloid can only exist in liquid, has strong adsorption, and can produce the phenomenon of butyl Dahl.

A large amount of iron hydroxide residue accumulation not only brings great pollution to the environment, but also pollutes the atmosphere. Many mines have the risk of shutdown due to the treatment of iron hydroxide residue.