Brief introduction：
Ferrous sulfate heptahydrate, commonly known as green alum, is an inorganic compound with the formula FeSO4·7H2O. Mainly used in the manufacture of iron salt, ink, magnetic iron oxide, water purification agent, disinfectant, iron catalyst; It is used as coal dye, tanning agent, bleaching agent, wood preservative and compound fertilizer additive, and processing ferrous sulfate monohydrate.The properties, applications, preparation and safety of ferrous sulfate heptahydrate are introduced in this paper.
Nature
Ferrous sulfate heptahydrate is a blue crystal with a positive alternating crystal system and a typical hexagonal close-packed structure.
Ferrous sulfate heptahydrate is easy to lose crystal water in the air and become anhydrous ferrous sulfate, which has strong reducibility and oxidation.
Its aqueous solution is acidic because it decomposes in water to produce sulfuric acid and ferrous ions.
Ferrous sulfate heptahydrate has a density of 1.897g/cm3, a melting point of 64 ° C and a boiling point of 300 ° C.
Its thermal stability is poor, and it is easy to decompose at high temperatures to produce harmful gases such as sulfur dioxide and sulfur trioxide.
Application
Ferrous sulfate heptahydrate is widely used in industry.
First, it is an important source of iron, which can be used to prepare other iron compounds, such as ferrous oxide, ferrous hydroxide, ferrous chloride, etc.
Secondly, it can be used to prepare chemicals such as batteries, dyes, catalysts, and pesticides.
In addition, it can also be used in wastewater treatment, desulfurization, phosphate fertilizer preparation and other aspects.
The importance of ferrous sulfate heptahydrate is self-evident, and it has a wide range of applications in industrial production.
Preparation method
There are many methods for the preparation of ferrous sulfate heptahydrate, and the common methods are as follows:
1. Preparation of sulfuric acid and ferrous powder.
2. Preparation of sulfuric acid and ferrous ingot reaction.
3. Preparation of sulfuric acid and ferrous ammonia.
It should be noted that the reaction conditions should be strictly controlled during the preparation process to avoid harmful gases and unnecessary losses.
Security
Ferrous sulfate heptahydrate has a certain risk, need to pay attention to the following points:
1. Ferrous sulfate heptahydrate is a toxic compound and should not be directly touched. Inhalation, ingestion and contact with skin and eyes should be avoided.
2. In the preparation and use of ferrous sulfate heptahydrate, care should be taken to prevent harmful gases and fire and explosion hazards.
3. During storage and transportation, attention should be paid to avoid contact with chemicals such as oxidants, acids and alkalis to avoid reactions and accidents.
Summary
In summary, ferrous sulfate heptahydrate is an important inorganic compound and has a wide range of applications.
In industrial production and laboratories, attention should be paid to its risk, and appropriate measures should be taken for storage, transportation and use to ensure personal safety and environmental protection.
At the same time, attention should be paid to saving resources in the process of use to avoid waste and pollution.
Post time: Aug-15-2023