Ferric sulphate is a highly corrosive inorganic compound used in wastewater purification processes. It is produced from ferrous sulphate and is supplied as a reddish-brown liquid. It can be stored in appropriate containers and used in various industrial applications, including dyeing and water treatment. It is also used to remove natural organic substances from water.
Ferric sulphate is an inorganic chemical compound used to increase the sedimentation rate in wastewater purification processes. With a pH of less than two, this compound is highly corrosive and should not be touched with bare skin. It is also known by many synonyms including Combiron, Copperas, Ferobuff, Ferric Persulfate, Green Salt and Slow Fe. It is produced by treating ferrous sulphate with an oxidizing agent.
The chemical compound is written as Fe2(SO4)3, which means it contains a total of three naturally occurring chemical elements. Ferric sulfate is supplied as a reddish-brown liquid produced from mined magnetic iron ore, virgin sulfuric acid, liquid oxygen, and water. Before being used in its countless industrial applications, the solution is prepared by oxidation, converting the ferrous iron contained in its composition into ferric iron. Stable concentrations of iron in the resulting compound reach 14%. The resulting solution can also be converted into granular form.
Ferric sulfate must be stored in appropriate containers. Due to its corrosive nature in liquid form, tanks and piping must be made of strong materials such as fiberglass or cross-linked polyethylene. However, the compound can be fed directly into water systems or mixed with organic polyelectrolytes. It is not considered a marine pollutant and, despite its properties, is used to reduce odor and corrosion.
The many applications of this compound in the industrial sector include dyeing, coagulation for pigments or industrial waste, production of potable water, municipal and industrial wastewater treatment and sludge conditioning. It works to prevent odor by eliminating hydrogen sulphide. This compound also operates over a wide pH range and decomposes at high temperatures. In other non-industrial sectors, ferric sulphate is also used to remove natural organic substances present in water, such as bacteria, arsenic and heavy metals.
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