What are the characteristics of dust? Briefly describe the characteristics of dust

Dust chargeability: After measurement and ultra-microscopic observation, the dust particles floating in the air have 90 95 positive or negative charges, and 5 10 dust particles are not charged. The ** of this charge is either generated by friction during crushing and flowing, or adsorbs charged ions in the air, or is charged by contact with the surface of other charged objects.

The same dust particles can be positively charged, negatively charged, or uncharged. The charge of dust particles has a certain effect on the stability of dust in the air. Same-sex charges repulsion, increase the retention time of dust particles floating in the air and increase the amount of human inhalation, opposite-sex charges attract, can make dust particles condense and settle when impacted, we often use the charge property of dust for dust removal.

Dust: Coal, sugar, flour and sulfur with high dispersion.

The unique properties of hemp, lead, zinc, aluminum and other dusts. The conditions for this to occur are that there must be high temperatures (flames, sparks, discharges) and dust in the air to reach a sufficient concentration.

Water absorption of dust: The water absorption of dust is determined by the composition, size, state of charge, temperature and air pressure of the dust. Water absorption increases with increasing pressure, decreases with increasing temperature, and decreases with smaller dust particles. Dust is easily moistened by water and is called hydrophilic.

Dust, on the contrary, is called hydrophobic dust. For hydrophobic dust, wet dust removal and purification should not be used. Some dusts absorb water to form water-insoluble hard scale, called hydraulic dust, which can cause blockages and cause the dust removal system to malfunction.

The contact area is large, flammable and explosive.

1) Mixing, screening, packaging and transportation of powdered materials, such as the production and transportation process of cement, flour, etc.

2) Mechanical crushing and grinding of solid materials, such as mineral processing, ore crushing process in refractory workshop and various grinding processes.

3) The oxidation and condensation of the steam generated when the substance is processed in the air, such as the zinc steam generated in the process of ore sintering and metal smelting, will condense and oxidize into zinc oxide solid particles when it is cooled in the air.

4) The combustion of substances, such as the amount of soot produced when coal is burned, accounts for more than 10 of the amount of coal burned.

When the particles dispersed in the gas are solid, they are called "dust"; When the particles dispersed in the gas are liquid, they are called "fog".

The nature of the dust, of course, is particularly important for the performance of these dust collectors.

The nature mainly includes that the teacher has drawn in this week, and what are the hidden crossover information with your skills, and it mainly includes non-city and his. These properties of simplicity should have a bright glow

These properties do not have a big impact on some of the performance of the dust collector, so this property should be included quite a lot.

This case, I think it's going to have no effect, it's all normal, there's nothing okay.

What are the main types of sex? Of course, this includes some of the features he chooses for the dust collector.

1. The particle size of the dust is stupid;

2. The bulk density of dust;

3. The best nature of dust;

4. The charge and specific resistance of dust rise;

5. Wettability of dust.

Dust refers to solid particles suspended in the air. It is customary to have many names for dust, such as dust, dust, soot, mineral dust, sand, powder, etc., and there is no clear boundary between these nouns. The International Organization for Standardization (ISO) defines suspended solids with a particle size of less than 75 m as dust.

The presence of dust in the atmosphere is one of the main reasons for maintaining the temperature of the earth, and too much or too little smiling dust in the atmosphere can have a catastrophic impact on the environment. However, in life and work, production dust is the natural enemy of human health and the main cause of a variety of diseases.

Dust is the powder of soil or other substances that are finely dried and powdered; something that has been reduced to a tiny part; Fine powder. Dust is the enemy of human health, so people especially hate it because it carries many bacteria, viruses and insect eggs everywhere and spreads diseases. Industrial dust and fine dust can make workers suffer from a variety of difficult occupational diseases, excessive dust can also cause environmental pollution, affect people's normal life and work, induce human respiratory diseases and so on.

However, the credit of dust must not be erased. If there is no dust in the atmosphere, sunlight cannot be absorbed, reflected, scattered and refracted, and the sky is either too bright or too dark. Since dust is a hygroscopic particle, without its core, the water vapor in the air cannot condense, and it is difficult for clouds in the sky to form, and the surface of the earth will become arid and barren without the cover of clouds, and the weather will either be too hot or too cold.

Without dust, many harmful rays in the universe would break into the Earth's surface unhindered and pose a deadly threat to humans and various living beings. In addition to these benefits, dust condenses water vapor. Let them become droplets, or everything will be wet.

Dust is the most widespread and harmful pollutant in the atmospheric environment. Dust in the atmospheric environment is divided into two types: floating dust and dust reduction. Dust is a matter of floating particles with dust particles of less than 10 microns, and dust falls from substances that are deposited by their own weight as pollutants in the atmosphere.

People who work in dusty places for a long time are more likely to develop bronchitis or silicosis than the general population. I used to work in the silicosis department (occupational disease), where patients were working in dusty areas for a long time. Dyspnea is a prominent feature.

In severe cases, it can turn into cancer. I'm not scaring you, these are some of the symptoms of his illness. If you have been in a dusty environment for a long time, it is recommended that you go to the hospital for a check-up.

In addition, you should take protective measures and wear a mask of moderate thickness.

Dust belongs to dust while dust does not belong to dust.