How to make iron oxide? How to prepare iron oxide?

Iron powder reacts with hydrochloric acid to form ferrous solution, and ammonia is added to form Fe(OH)2 gel. Oxygen from hydrogen peroxide and manganese dioxide is passed into the Fe(OH)2 gel and heated to give a Fe(OH)3 precipitate. Separate the precipitate from the solution.

Fe(OH)3 is burned to give iron oxide.

Manganese dioxide is added to the hydrogen peroxide solution until no more bubbles are produced (filtered, can be omitted) (at this time, H2O2 becomes distilled water), the hydrogen peroxide solution after the reaction is heated with an alcohol lamp, and the generated steam is passed into a horizontal test tube filled with iron powder, heated with an alcohol blowtorch (as we all know, ethanol is alcohol), and at this point, iron oxide is generated.

Iron oxide is ferric oxide, and its chemical formula is Fe2O3.

There are two preparation methods (wet and dry):Wet

feso4+2naoh=fe（oh）2+na2so44fe（oh）2+o2+2h2o=4fe（oh）34feso4+4h2o+o2=2fe2o3↓+4h2so4fe+h2so4=feso4+h2↑

A certain amount of 5% ferrous sulfate solution is quickly reacted with excess sodium hydroxide solution (excess alkali is required, and air is introduced at room temperature to make it all turn into a reddish-brown iron hydroxide colloidal solution, which is used as the crystal nucleus for depositing iron oxide. With the above-mentioned crystal nucleus as the carrier, with ferrous sulfate as the medium, the air is introduced, in the presence of metallic iron, the ferrous sulfate reacts with oxygen in the air to generate iron oxide (i.e., iron red) deposited on the crystal nucleus, and the sulfate in the solution reacts with the metal iron to regenerate ferrous sulfate, and the ferrous sulfate is oxidized into iron red by the air and continues to be deposited, so that the cycle ends to the end of the whole process, and the red iron oxide is generated.

Dry process

Nitric acid reacts with iron to form ferrous nitrate, which is cooled and crystallized, dehydrated and dried, and calcined at 600 700 for 8 10h after grinding, and then washed, dried and crushed in water to obtain iron oxide red products.

4Fe(NO3)3 2Fe2O3+12NO2 +3O2 Fe2O3·NH2O Fe2O3+NH2O can also be used as raw material for iron oxide yellow, which is calcined at 600 700 to obtain iron oxide red.

is: 4Fe + 3O2 = 2Fe2O3 under the condition of ignition.

Elemental iron ignites in the air and can produce iron oxide and ferric tetroxide under different conditions.

There are three products of ferrous oxide. The formation of iron oxide usually requires the formation of ferrous oxide, which then continues to burn to form iron oxide.

The uses of iron oxide are:

As a pigment, iron oxide is widely used in high-grade automotive coatings, architectural coatings, anti-corrosion coating materials, and powder coatings.

It is a good environmentally friendly coating, and the annual consumption of iron oxide pigments in the world exceeds 1 million tons, second only to titanium dioxide, ranking second in inorganic pigments.

The use of iron oxide as a pigment not only maintains the good heat resistance and weather resistance of general inorganic pigments.

and absorbing ultraviolet rays.

and other advantages, and can be well dispersed in oily carriers, and the coatings or inks prepared with it have satisfactory transparency. Paints made of iron oxide, which has semiconductor properties, have high conductivity and can be used for electrostatic shielding.

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The properties of iron oxide:

Iron oxide is a reddish-brown to reddish-brown powder. Odorless. Insoluble in water, organic acids and organic solvents.

Soluble in inorganic acids. There are two types: -type (positive magnetic) and -type (diamagnetic). The fineness of products produced by the dry process is generally less than 1 m.

It is stable to light, heat and air cracking liquid. It is relatively stable to acids and alkalis. Strong tinting strength.

Refractive index. The melting point is 1550, and it decomposes in about 1565.

The above content refers to Encyclopedia - Iron Oxide.

Iron oxide is also known as burnt limonite, burnt ochre, iron dan, iron red, red powder, etc.

The appearance is reddish-brown powder, easily soluble in strong acid, medium strong acid, its red-brown powder is a low-grade pigment, industrially called iron oxide red, used in paint, ink, rubber and other industries, can be used as a catalyst, glass, gemstones, metal polishing agent, can be used as ironmaking raw materials.

There are wet and dry preparation methods. Wet products have fine crystals, soft particles, easy to grind, and are easy to use as pigments. Dry products have large crystals and hard particles, and are suitable for magnetic materials and polishing and grinding materials.

The use of iron oxide is that iron oxide is widely used as a pigment in high-grade automotive coatings, architectural coatings, anticorrosive coatings, powder coatings, and is a better environmentally friendly coating, with an annual consumption of iron oxide pigments in the world exceeding 1 million tons, second only to titanium dioxide, ranking second in inorganic pigments.

The use of iron oxide as a pigment not only maintains the advantages of good heat resistance, group resistance and ultraviolet absorption of general inorganic pigments, but also can be well dispersed in the oily carrier, and the paint or ink with which it is used to modulate the collapse has satisfactory transparency. Paints made of iron oxide, which has semiconductor properties, have high conductivity and can be used for electrostatic shielding.

Physical properties of iron oxideIron oxide is a reddish-brown to reddish-brown powder. Odorless. Insoluble in water, organic acids and organic solvents.

Soluble in inorganic acids. There are two types: -type (positive magnetic) and -type (diamagnetic). The fineness of products produced by the dry process is generally less than 1 m.

Stable to light, heat and air. It is relatively stable to acids and alkalis. Strong tinting strength.

Refractive index. The melting point is 1550, and it decomposes in about 1565.