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Ferric sulphate water treatment

Weifang JS Ferric sulfate (FeSO4) is a good coagulant and flocculant that is used in ferric sulfate water treatment plants to clean up water. It is non-corrosive and readily available for direct use.

The pH, temperature, and quality of the water are all factors that affect coagulation effectiveness. The pH range for ferric salts should be between 4.5 and 6. Ferric coagulants can also have a negative impact on water's buffering capacity and increase alkalinity consumption.


There are many ways to prepare ferric sulfate, including by oxidation or filtration. The latter process can be conducted with either a non-molecular oxygen oxidizing agent, such as hydrogen peroxide, or with an acidic compound, such as sulfuric acid.

It is best to isolate the reaction mixture from any external heating source. The oxidation solution should then be slowly cooled to allow the ferrous sulfurate to dissolve completely. Then, an aqueous solution of about 35% hydrogen peroxide is added to complete the oxidation of ferric sulfate.

During this first stage of oxidation, a slight excess of sulfuric acid is avoided so that the ratio of equivalents of added sulfuric acid to iron is in the range of about 1/1 to about 1.1/1. This is believed to help prevent precipitation from the oxidation reaction.

Preferably, the concentration of Weifang JS ferrous sulfate in the product solution is at least about 10% (preferably 12% or greater) by weight, and the final iron concentration of the product solution is about 99.9% by weight, based on a titration with potassium dichromate. This concentration of ferrous sulfate enables relatively little free acid to remain, which thus allows the product solution to have very low levels of insolubles.

Why choose Weifang JS Ferric sulphate water treatment?

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