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Dust source and classification

Dust source and classification

In the actual production of many industries, there will be a lotof dust, such as cotton mills, metal cutting plants, sand and gravel plants. Infact, the classification and source of dust in different industries are alsodifferent, let the mine equipment industry engaged in more than sixty years ofZK CORP to unveil the mystery of the dust family.

The solid particles that can be floating in the air for a longtime are called dust. The generation of dust has a serious impact on theworking environment and physical health of operators. It may even cause avariety of serious diseases. It requires us to provide more protection in theproduction process. To a great extent, reduce the harm it brings.

The dust formed in the production process is called productiondust. From a colloidal chemistry point of view, dust is an aerosol in which thedispersion medium is air and the dispersed phase is solid particles. There aremany sources of dust in the production process. Here are some of the mainsources of dust.

First, the main source of dust

1. Machining or crushing of solid materials, such as metalgrinding, cutting, drilling, blasting, crushing, grinding, processing ofagricultural and forestry products, etc.

2. The dust particles formed when the substance is heated andcondensed or oxidized in the air, such as metal smelting, welding, casting,etc.

3. Particles formed by the incomplete combustion of organicsubstances, such as smoke, dust, etc. produced when wood, oil, coal, etc. areburned.

4. The sanding of the castings and the mixing of the powderedsubstances of the sand-washing, the filtering, packing, and handlingoperations, as well as the deposition of dust due to vibration or air movement,causes the deposited dust to float again in the air (secondary dust generation) is also a source of dust.

Second, the classification of dust

There are usually two methods for classifying dust, one is theclassification of the nature of the dust and the other is the classification ofthe size of the dust particles.

1. According to the nature of dust can be divided into:

(1) Inorganic dust: Including mineral dust (such as sand, coal):metallic dust (such as iron, tin, lead and its compounds), artificial inorganicdust (such as corundum, cement, glass fiber).

(2) Organic dust: Includes plant dust (such as wood, tobacco,flour) animal dust (such as animal skin, keratin, hair), artificial organicdust (such as explosives, organic dyes, plastics, chemical fiber).

(3) Mixed dust, a mixture of the above-mentioned various dusts(such as metal, abrasive dust mixture, etc.). In the work, it is often based onthe nature of the dust to initially determine the mechanism and extent ofdamage to the human body.

2. According to the size of dust particles can be divided into:

(1) Dust: The diameter of dust particles is greater than 10microns. In still air, it accelerates sedimentation and does not spread.

(2) Dust fog: The diameter of the dust particles is between 10 and0.1 μm. It can be dropped at constant speed in still air, and it is difficultto diffuse.

(3) Smoke: Dust particle diameter of 0.1 ~ 0.001 microns, becauseits size is close to the air molecules, by the collision of air moleculesshowed Brownian motion (irregular movement), almost completely no settlement orvery slow and tortuous landing.

Due to the different sizes of dust particles, the length of timethey stay in the air is also different, and the governance methods adopted by thedust in the air are different. No matter what kind of dust is, it is verydangerous to exist in a large number of production workshops. The ZK CORPreminds all enterprises that attention must be paid to dust concentration inthe workshop factory. According to the different types of dust, correspondingdust collection methods should be adopted to collect dust.

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