The difference between China hexahydrate ferric chloride and china tetrahydrate ferrous chloride

Ferric Chloride Hexahydrate
Grade : pharmaceutical, high purity USP ,EP CP grade ,AR grade

The difference between hexahydrate ferric chloride and tetrahydrate ferrous chloride
1. Differences in raw materials
Ferric chloride hexahydrate (FeCl ∝· 6H ₂ O)

Main raw materials: Iron or iron oxides (such as iron filings and iron powder) react with hydrochloric acid to form ferric chloride solution, which crystallizes to obtain hexahydrate 46.
Source of by-products: Some can be further purified by oxidation of ferrous chloride to prepare 8.
Tetrahydrate ferrous chloride (FeCl ₂ · 4H ₂ O)

Main raw materials: Steel pickling waste liquid (containing ferrous chloride) is concentrated and crystallized, or synthesized by reacting potassium chloride with iron powder to form 13.
Purity control: It is necessary to avoid oxidation and stabilize the product through nitrogen protection or vacuum packaging.
2. Comparison of production processes
Characteristic: hexahydrate ferric chloride tetrahydrate ferrous chloride
The core reaction involves the direct reaction of iron with hydrochloric acid to produce ferric chloride solution, which crystallizes into hexahydrate. The acid washing waste liquid (containing Fe ² ⁺) is concentrated and crystallized or synthesized from potassium chloride and iron powder
Oxidation control requires controlling reaction conditions to avoid the generation of by-products (such as FeCl ₂). Oxygen must be strictly isolated to prevent oxidation to ferric chloride; Vacuum/nitrogen protection process is commonly used
After evaporation and cooling of the crystallization process solution, brownish yellow crystals precipitate, which are prone to moisture absorption and need to be sealed for storage. 68. Green crystals need to be dried at low temperatures to avoid decomposition or oxidation caused by high temperatures

3. Differences in application fields
Hexahydrate ferric chloride

Water treatment: efficient flocculant used to remove suspended solids and heavy metal ions from wastewater.
Electronic industry: preparation of circuit board etchants and magnetic materials (such as synthesis of iron oxide powder) 28.
Chemical synthesis: Production of organic reaction catalysts (such as phenol chlorination) and dye intermediates.
Tetrahydrate ferrous chloride

Wastewater treatment: The decolorization effect of printing and dyeing wastewater is significant, better than ferrous sulfate 35.
Magnetic material: High purity iron oxide powder is generated by high-temperature calcination and used for the production of manganese zinc ferrite.
Food and Agriculture: Preservatives, Fertilizer Additives (must meet low toxicity standards) 5.
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There are significant differences between hexahydrate ferric chloride and tetrahydrate ferrous chloride in terms of raw material sources, production processes, and core applications. The former focuses on oxidizing trivalent iron and is suitable for high oxidation scenarios such as etching and catalysis; The latter is characterized by reducing divalent iron and is more suitable for fields such as decolorization and preparation of magnetic materials that require oxidation inhibition.

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