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Causes of Dust in Mine Processing Plants and Methods of Dust Removal

Posted: 2022-05-20

Dust is one of the main reasons that seriously restrict the efficient, safe, and clean production of mining processing plants. Dust can be generated from the process of conveying, transferring, crushing, screening, and entering the production workshop. Therefore, strengthening the improvement of production processes is the main method to control the diffusion of dust, fundamentally eliminate the harm of dust, and then achieve the goal of environmentally friendly production.

1. Cause of dust

According to the way of dust generation and the inducing factors, the reasons for dust generation can be divided into two types:

A.In the process of processing bulk materials, the air mobility is significantly increased, and then the fine granular materials are brought out to form dust (primary dust).

B.Due to the operation of equipment and other equipment in the production workshop, the indoor air mobility is significantly increased, which in turn causes the re-dusting (secondary dusting) of indoor dust.

2. Dust control method for crushing and screening

A. Airtight ventilation and dustproof method

The dust in the mine dressing plant mainly comes from the workshop that handles bulk ore materials, and its crushing, screening, and transportation equipment are all sources of dust. Therefore, for this workshop, the method of closed ventilation can be used to control and eliminate dust. It can effectively control the outward diffusion of dust, and can also provide basic conditions for exhaust and dust removal.

The core technology of closed dust removal is to arrange closed dust hoods at the main dust-generating positions. Effectively control the source of dust, and then suck the dust into the dust cover through the power of the fan in the exhaust equipment, and discharge it from the corresponding pipeline after being treated by the dust collector.

Therefore, the dust collector is the main component of the process, and the selection should consider the following points:

a. Consider the properties of the gas to be removed, including its humidity, temperature, dust concentration, corrosiveness, etc.

b. Consider the properties of dust, such as dust composition, particle size, corrosiveness, viscosity, explosiveness, specific gravity, hydrophilicity, heavy metal content, etc.

c. Consider evolving air quality requirements, such as dust content in the gas.

B. Wet dustproof method

Wet dust removal is the most commonly used dust removal method, which increases the humidity of ore materials by spraying water during the transportation, crushing and screening of ore materials. It indirectly increases the humidity, specific gravity and viscosity of fine materials, making it difficult for fine materials to mix with air to generate dust. Or spray the generated dust at the dust-raising point, so that the dust particles in the air will settle due to the increase in humidity, so as to achieve the purpose of dust removal.

Compared with spray dust removal, spray dust removal is a simpler and more economical method, and the effect is good. It is mainly composed of two parts: spray system (atomizer, electric ball valve, water supply device, and pipeline), and electric control system.

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