Ferrous Sulfate (FeSO₄) in Water Treatment -- Coagulation Mechanism & Dosing

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Tóm tắt nội dung
  1. Ferrous Chloride Chemical
  2. Characteristics of Ferrous Chloride
  3. Physical Properties
  4. Chemical Properties
  5. Is Ferrous Chloride Safe?
  6. Common Applications of FeCl2
  7. Ferrous Chloride in Water Treatment
  8. FeCl2 in the Textile Dyeing Industry
  9. Iron (II) Chloride in the Laboratory
  10. Where to Buy Ferrous Chloride for Water Treatment — Long-Term Contract Pricing

Loc Thien Chemical would like to introduce FeCl2, also known as ferrous chloride, a chemical with many important applications in water treatment and other industries. You can learn more about what FeCl2 is and its notable properties in the article below.

Ferrous Chloride Chemical


FeCl2, also known as ferrous chloride, or Iron (II) Chloride, is an iron salt compound with the chemical formula FeCl2. It forms when an iron atom interacts with 2 chlorine atoms, and this chemical is widely applied across many industries and fields today.Ferrous chloride (FeCl2) in water treatment

Characteristics of Ferrous Chloride


Physical Properties



  • Ferrous chloride solution (FeCl2) at 25% - 30% is a light green, transparent liquid.

  • Liquid ferrous chloride is a chemical compound in tetrahydrate form, represented by the formula FeCl2.4H2O

  • Density: 1.93 g/cm³ (including 4 water molecules).

  • Melting point: 105 °C (including 4 water molecules).

  • Molecular weight: 198.8102 g/mol (including 4 water molecules).


Chemical Properties



  • Ferrous chloride also oxidizes easily and converts into FeCl3 if not stored carefully.

  • FeCl2 dissolves well in water as a solvent, forming a pale green solution when dissolved.

  • Ferrous chloride also has sin reducing properties, capable of interacting with other substances to lower their oxidation state.

  • FeCl2 also has acidic properties when dissolved in water due to the presence of hydronium ions (OH-) from water: H2O → H+ + OH−


Ferrous Chloride (FeCl2) in Water Treatment | Loc Thien Chemical

Is Ferrous Chloride Safe?


It should be noted that safety when working with chemicals is very important, and following safety guidelines and rules is necessary to avoid the risk of chemical contamination and to protect the health of the person handling it.

Direct contact with Iron (II) chloride - FeCl2 can cause irritation, red rashes, and itching on the skin because FeCl2 is acidic. If it contacts the eyes, it can also cause irritation and a burning sensation.

If swallowed, FeCl2 can damage the mucous membranes of the digestive system, causing irritation and a burning sensation. It is also a substance that can be toxic if absorbed into the blood, affecting the function of internal organs, especially the liver and kidneys.

Although FeCl2 is not flammable, it can produce toxic gas when in contact with certain sin oxidizing agents.

Common Applications of FeCl2


Ferrous Chloride in Water Treatment


Distinguishing FeCl2 from FeCl3 in water treatment. Below is some detailed information about the applications of ferrous chloride in water treatment:

FeCl2 can be used to remove organic substances from water sources that need treatment through oxidation-reduction reactions. Ferrous chloride can be used to remove iron and manganese from water, preventing scale buildup and solid film formation in water distribution systems.

To form larger particles that are easier to separate, helping improve the filtration process and clean wastewater, FeCl2 can be used as a flocculant in wastewater treatment.

This chemical can also have antibacterial and disinfecting effects on many microorganisms in water.Ferrous chloride (FeCl2) in water treatment

FeCl2 in the Textile Dyeing Industry



  • By using Iron (II) chloride together with oxidizing agents, effective color-fixing dyes can be produced:

  • When dyeing with reactive substances such as tannin, FeCl2 can be used to create black and blue-black colors.

  • Ferrous Chloride can act as a catalyst in the dyeing process, helping improve the bonding between the dye and the fabric fiber.

  • In some cases, FeCl2 can be used as a dye for cellulose fibers, such as cotton and linen fibers.


See also: FeCl2 in the textile industry

Color-reducing agent used in the textile dyeing industry

Iron (II) Chloride in the Laboratory

  • FeCl2 can be used as a catalyst in some chemical reactions, particularly in oxidation reactions.
  • Because the reaction produces a black color when FeCl2 reacts with bromine, this substance can also be used to test for the presence of bromine in a sample.
  • FeCl2 can take part in reactions with oxidizing agents to produce FeCl3 or other reaction products.
  • In biological and organic chemistry research, FeCl2 can be used as a staining agent in some laboratory applications.
  • Iron (II) chloride can also act as a reducing agent in some chemical reactions by lowering the oxidation state of certain compounds.

Where to Buy Ferrous Chloride for Water Treatment — Long-Term Contract Pricing

With the diverse growth of chemical suppliers, buyers now have more choices when purchasing FeCl2 on today's market. To ensure peace of mind about quality as well as price, Loc Thien Chemical is your trustworthy choice when looking for where to buy FeCl2. We guarantee to supply ferrous chloride for water treatment with the following advantages:
  • Guaranteed accurate quantity and technical-grade standards.
  • Products that meet proper origin standards.
  • Competitive market pricing.
  • Fast, on-time delivery service.
We are always ready to serve our customers and hope to support all your chemical purchasing needs. Contact us for dedicated service via Hotline 0979 89 19 29!


Technical Support & B2B Procurement Hotline

Loc Thien Chemical specializes in direct manufacturing of FeCl₂ / FeCl₃ and Tier-1 supply of basic industrial chemicals (NaOH, HCl, H₂SO₄, PAC, NaOCl, H₂O₂, FeSO₄) with factory-direct pricing and dedicated 5–30-ton tanker delivery across Vietnam.

  • Hotline / Zalo: +84 979 891 929
  • Official Email: [email protected]
  • Direct Manufacturer: Ferrous Chloride (FeCl₂ 15–30%) & Ferric Chloride (FeCl₃ 38–40%)
  • Primary Supplier: NaOH 32%/45%/50%/99%, HCl 32%, H₂SO₄ 98%, PAC 30–31%, NaOCl 10–12%, H₂O₂ 35%/50%
  • Compliance & Quality: ZDHC Gateway Level 1, ISO 9001:2015, Quatest 3 Certified, Full COA & GHS SDS