Iron powder is a very important raw material in metallurgical industry. It can be divided into different grades and produce different effects. How to store iron powder correctly?

Iron powder is the main raw material of powder metallurgy. According to the particle size, it is usually divided into five grades: coarse powder, medium powder, fine powder, fine powder and ultra-fine powder. The iron powder composed of particles with a particle size of 150-500 μ m is coarse powder, medium particle size of 44-150 μ m, fine particle size of 10-44 μ m, ultra-fine particle size of 0.5-10 μ m, and ultra-fine particle size of less than 0.5 μ M. Powder. Generally, the powder that can pass 325 mesh sieve, that is, the powder whose particle size is less than 44 μ m, is called sub sieve powder. If higher precision screening is used, only gas classification device can be used, but for some easily oxidized iron powder, only JZ can be used

DF. Nitrogen maintenance grading machine should be done. Iron powder mainly contains reduced iron powder and atomized iron powder, which are named after different production methods.

Pure metal iron is silvery white, and iron powder is black. This is an optical problem. Because the surface area of iron powder is small, there is no fixed geometry, and the crystal structure of iron block is geometric, so iron block absorbs some visible light, reflects other visible mirrors, and shows white. Light that iron powder does not absorb is diffusely reflected, and there is less visible light that can enter human eyes, so it is Black.

Precautions for iron powder operation: close the operation and exhaust part of the air. Iron powder operators must pass special training and strictly abide by the operating procedures. It is recommended that operators wear self-priming filter dust mask and chemical safety protection device. Glasses, wear-resistant rubber acid and alkali resistant clothing, wear-resistant rubber acid and alkali resistant gloves. Keep away from flammable and combustible materials. Avoid dust. Avoid contact with alkali and alcohol. Pay special attention to avoid contact with water. Prevent damage to packaging and containers. Equip emergency equipment for leakage. Empty containers may contain harmful substances.

Precautions for iron powder storage: store in a cool, dry and well ventilated warehouse, away from fire and heat source. Keep the relative humidity below 75%. Iron powder packaging is necessary to seal, do not get damp, should be easy (can) separate storage of fuel, alkali, wine, etc., should not be mixed storage. It should not be stored for a long time to avoid deterioration. The storage area should have proper information to keep the leakage.