What is the difference between reducing iron powder and iron powder? Reducing iron powder is obtained by reducing ferric oxide with hydrogen at a high temperature. Water atomized pure iron powder has particularly strong reducibility and very lively properties. Powder is easy to ignite spontaneously in the air and belongs to dangerous goods. Ordinary iron powder is the powder of elemental iron. Iron powder is not a tube product and can be purchased.

Reduced iron powder

Carbon monoxide is used to reduce pure magnetite (Fe3O4) or hydrogen oxide is used to reduce iron oxide powder generated during rolling. The elemental iron powder produced by these two methods is called "reduced iron powder"; because of its good porosity and sponge-like microstructure, it is also called "sponge iron powder".

Reduced iron powder is generally produced by the reduction of triiron tetroxide in a hydrogen flow or a carbon monoxide flow under high heat conditions. The main component is loose elemental iron. The reduced iron powder itself is powdery and its microstructure is very loose, so its surface area is extremely large. It is often used as a high-quality reducing agent in chemical production and laboratory operations.

Reducing iron powder is popularly referred to as iron powder prepared by a reduction method, also called reduced iron powder (pure iron). A highly active iron powder, because of its strong reducing ability, is prone to oxidation reactions, and even burns slightly in the air, because of its characteristics, it is often used for welding rails, chemical reduction, prevention Oxidative deterioration and so on.

The micropores in the internal structure of elemental iron powder reduced with hydrogen are also smaller than those in the internal structure of elemental iron powder reduced with carbon monoxide, so that it is highly absorbed by the human body. When added to food, the micropores of these two kinds of elemental iron powder can be filled with oil, and they can cry on their own. The micropores of these two elemental iron powders also enlarge the surface area of the elemental iron powder particles and accelerate the rate of dissolution in the stomach with a lower pH value. In other words, reduced iron powder is very loose iron powder.

Iron powder

Iron powder mainly includes reduced iron powder and atomized iron powder, which are named because of different production methods. Is the main raw material for powder metallurgy. According to the particle size, it is customarily divided into five grades of coarse powder, medium powder, fine powder, fine powder and ultrafine powder. Iron powder with a particle size in the range of 150 to 500 μm is coarse powder, particle size is 44 to 150 μm is medium powder, 10 to 44 μm is fine powder, 0.5 to 10 μm is extremely fine powder, and less than 0.5 μm is ultra fine powder. Generally, the powder that can pass through a 325 mesh standard sieve, that is, the particle size is less than 44 μm, is called sub-sieve powder. For more high-precision screening, only air classification equipment can be used. Do it with a nitrogen protective classifier.

Pure metallic iron is silver-white, and iron powder is black. This is an optical problem because the surface area of the iron powder is small and there is no fixed geometry, and the crystal structure of the iron block is geometric, so the iron block absorbs some visible light. The other part of the visible light is reflected by the mirror, showing white; the light that has not been absorbed by the iron powder is diffusely reflected, and there is less visible light that can enter the human eye, so it is black.

Pig iron powder

Pig iron powder refers to pig iron ground into powder, and pig iron is an iron alloy with a carbon content of more than 2%.

The main difference between pig iron, wrought iron and steel is the carbon content. Iron with a carbon content of more than 2% is called pig iron; iron with a carbon content of less than 0.05% is called wrought iron;

Pig iron powder: It is also known as cast iron powder, which is a metal powder with 0 to 200 or less after being ground and machined with pig iron. Its elemental iron content generally ranges from 85 to 95.

Chemical reduced iron powder (other names: cast iron powder, pig iron powder) is widely used in medicine and dye intermediates, health products, sewage treatment, preservatives, counterweight iron and other industries.