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Ferric Chloride used in water treatment

Iron(III) chloride - Physico-chemical Properties
Molecular Formula:Fecl3

Molar Mass:162.2

Density:2,804 g/cm3

Melting Point:304°C(lit.)

Boling Point:316 °C

Flash Point:316°C

Water Solubility:920 g/L (20 ºC)

Solubility:H2O: soluble

Vapor Presure:1 mm Hg ( 194 °C)

Vapor Density:5.61 (vs air)


Specific Gravity:2.804


Exposure Limit:ACGIH: TWA 1 mg/m3NIOSH: TWA 1 mg/m3


PH:1 (200g/l, H2O, 20℃)

Storage Condition:Store below +30°C.

Stability:Stable. Very sensitive to moisture. Incompatible with strong oxidizing agents; forms explosive mixtures with sodium, potassium. Hygroscopic.


Refractive Index:n20/D1.414

Physical and Chemical Properties:Character black-brown hexagonal crystal. In the transmission of light in the pomegranate red, reflected light under the metal Green.
melting point 306 ℃
relative density 2.898

Iron(III) chloride - Names and Identifiers

Name:Iron(III) chloride

Flores martis
Ferric chloride
iron trichloride
Ferric trichloride
Iron(III) chloride
Iron chloride (FeCl3)
Iron chloride (Fe2Cl3)
ferric chloride anhydrous
Ferric chloride, anhydrous
Iron (III) chloride anhydrous
Ferric Chloride Manufacturer
Ferric chloride test solution(ChP)





Ferric Chloride 99% MIN
FeCl3 96 MIN 99.40% GB/T 1621-2008
FeCl2 2% MAX 0.20% GB/T 1621-2008
INSOLUBLE 1.5% MAX 0.25% GB/T 1621-2008

erric chloride is an important water treatment agent. Its real feature is that it not only has the function of coagulant because it can remove impurities in water, but also has the flocculation function of coagulant aid, so it has multi-functionality. It is an aqueous solution obtained by oxidizing ferrous chloride with chlorine gas. Its outstanding features are pure quality and high iron content. However, the alum flower produced by the trivalent iron coagulant has weak hydration, high mechanical strength, and is not easily broken. , and non-toxic. The performance of trivalent iron coagulant in removing humus and other organic matter is also better than that of aluminum coagulant.

After ferric chloride reacts with hydroxide alkalinity in water, a variety of hydrolysis products are formed, which are then combined into Fe(OH)3. These hydrolysis products have a lot of positive charges, so they can neutralize the negative charges on the colloidal particles and combine with the negatively charged particles and iron trihydroxide. Due to this binding ability, it has the ability to flocculate and form alum flowers.

Ferric chloride reacts with hydrogen sulfide (H2S), phosphate (PO4), arsenate (AsO4), and hydroxide alkalinity (OH) in water to form a precipitate. However, in the treatment of drinking water, the main function of ferric chloride is the coagulant and coagulant of the product after it reacts with the alkalinity of hydroxide.

Since the alum flowers produced by ferric chloride are discrete and dense, the precipitation is fast, and the precipitation is also good in low temperature water. This kind of dense alum has a lot of positive charges, so it has a strong interaction with colloidal particles in water. Since the ratio of the charge on the ferric chloride hydrolysis product to its mass is large, its action and adsorption on emulsified and semi-emulsified organic substances (such as oil, fat and other natural and synthetic organic substances) in water The ability is strong, so ferric chloride has a strong ability to remove the precursors of total organic carbon and disinfection by-products in water.

The hydrolysis product of ferric chloride (ie ferric hydroxide) is different from the hydrolysis product of ferric sulfate, aluminum sulfate, and other sulfates. In terms of physical properties, the particles of ferric chloride have strong discreteness. Dense and positively charged. On the contrary, the alum flower particles produced by the hydrolysis of ferric sulfate and aluminum sulfate are weakly discrete and look like loose fluff or floating clouds. Apparently, this situation is due to the different binding forms of the hydrolyzate. This difference leads to differences in the properties and functions of ferric chloride and sulfate-based coagulants. For waterworks, in order to obtain the same water treatment effect, the dosage of ferric chloride can be reduced by 30% compared with aluminum sulfate (based on the weight of anhydrous matter)

Another characteristic of ferric chloride is that it can form alum flowers in a wide range of pH values. Compared with aluminum hydroxide, the solubility of ferric hydroxide is very low. Due to these characteristics, the ferric chloride coagulant has a very wide range of pH values, and the treated water will not take away a large amount of iron from the clarification process to cause hysteresis precipitation. Due to the above advantages, all users who have used it have fully affirmed this.

The reaction between ferric chloride solution and waste water produces ferric hydroxide precipitation and hydrolysis, which produces strong cohesion and has excellent flocculation performance. The precipitation speed is higher than that of aluminum salt flocculants (such as polyferric sulfate, polyaluminum chloride, etc.), Impact on performance: high settling speed, compact alum formation, less sludge volume, greatly saving sludge treatment costs. Liquid ferric chloride is used as a flocculant for drinking water, industrial water, industrial wastewater, urban sewage and swimming pool water treatment. It has obvious effects on the removal of heavy metals and sulfides, decolorization, deodorization, oil removal, sterilization and phosphorus removal. Ferric chloride is a high-efficiency flocculant for the treatment of domestic sewage and industrial wastewater. It can remove heavy metals and sulfides, decolorize, deodorize, degrease, sterilize, and remove phosphorus. It can obviously reduce the COD and BOD of effluent.

Ferric Chloride 99% MIN
FeCl396 MIN99.40%GB/T 1621-2008
FeCl22% MAX0.20%GB/T 1621-2008
INSOLUBLE1.5% MAX0.25%GB/T 1621-2008

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