What is the best way to deal with coal mine dust in the world today

Generally, a water curtain is installed to reduce dust.

Answer: The common masking dust in coal mines mainly includes coal dust, gangue dust, smoke and dust generated by coal and rock, and wind dust generated during mine ventilation.

Explanation: A large amount of dust will be produced in the production process of coal mines, of which coal dust is one of the most important dusts, mainly generated in the process of coal mining, crushing, transportation and storage. In addition, gangue dust is mainly produced during the crushing, transportation and treatment of coal and gangue mixtures; The soot produced by coal blind dust rock is mainly due to the debris and particulate matter produced by coal and rock in the process; The wind and dust generated during the ventilation process of the mine are caused by the air flow and formation damage caused by underground operations.

These dusts have a great impact on the health and production safety of coal miners.

Expansion: In order to reduce the impact of dust on coal miners, coal mining enterprises need to take a series of measures, including strengthening ventilation, wet dust reduction, closed operations, and using dust-proof equipment. At the same time, a series of policies and regulations have also been introduced to regulate and supervise the dust control of coal mining enterprises to ensure the production safety and health of coal miners.

2.Gangue dust: Gangue dust generated during coal mining and high-level operations in the mining chain.

3.Rock dust: Rock dust generated during underground mining and tunnel construction.

4.Mineral dust: includes dust generated in the mining and processing of metallic minerals such as gold, silver, copper, zinc, and iron.

5.Chemical dust shed: dust produced by the volatilization of chemicals used in the production process of coal mines, such as lubricating oil and fuel.

6.Shedding of human body**, hair, fluff, etc., as well as dust, smoke and other impurities.

The most important factor in the production of coal powder is the surface moisture of the material, it is the biggest factor affecting the dust, when the surface moisture is equal to 7%, it is a turning point of the amount of dust, when it is greater than 7%, the amount of dust decreases rapidly, at 10%, the visible dust will not be produced, and when the surface moisture reaches 13%, there is basically no dust.

The surface moisture of the material can be used as an indicator for the dust control design of the coal conveying system, which can guide the dust pollution and improve and strengthen the dust removal design measures.

Mine dust control generally uses pulse bag dust collector to transfer crushing and screening belts for dust control.

Before doing a good job in coal mine dust control, let's first do a good job of personal respiratory protection.

Pneumoconiosis is caused by the fibrosis of lung tissues caused by inhalation of dust, which reduces the ability of the lungs to exchange oxygen, leading to a hypoxic response of the body. Long-term inhalation of dust is susceptible to pneumoconiosis. It is recommended to work under dust, and you must choose a dust mask scientifically.

A good dust mask can not only prevent dust, but also improve work efficiency. Now protective masks must implement the GB2626-2006 standard. According to the national standard, the scientific name of the dust mask is a self-priming filtering anti-particulate matter respirator.

According to the different protection objects, it is divided into oil-proof particulate matter (oil smoke, oil mist and non-oily particulate matter) and non-oily particulate matter (dust, smoke, fog, microorganisms, etc.).

Dust masks are divided into three grades: KN100, KN95 and KN90. KN100 can achieve nearly 100% (more) protection against ultrafine dust.

According to the nature of the use of masks, there are also three types: disposable masks, compound half masks, and full face masks.

The protective effect of a mask depends on 2 aspects. One is the filtration efficiency of the filter cotton. The second is the air leakage rate after the mask is mated to the face.

Therefore, masks must be divided into large and small sizes, and the air leakage rate between masks and faces varies from person to person. The scientific selection of dust masks certified by the GB2626-2006 standard helps to prevent lung damage.

1 Dust generation in coal mines Almost all the main links of coal mine production, such as coal mining, tunneling, transportation and lifting, produce dust to varying degrees. 2 Factors influencing dust generation Mining mechanization and mining intensity, coal mining methods and cutting parameters, ventilation conditions at the operation site, geological structure and coal seam occurrence conditions. 3 Basic properties of coal mine dust (1) Dust dispersion.

The composition of the size of the dust particles can be expressed in terms of dispersion (i.e., particle size distribution). Dust particles with an aerodynamic diameter of less than 7 1 m in the production environment, especially dust particles less than 2 m, are the main harmful dusts causing pneumoconiosis. (2) Dust adsorption.

The adsorption capacity of dust is closely related to the surface area of dust particles, and the larger the dispersion, the larger the surface area, and the greater the adsorption capacity. The main indicators are hygroscopicity and toxicity. (3) The charge of dust.

Dust particles can have an electric charge, which is the coal and rock charged due to friction in the crushing, or collide with ions in the air and charged, the amount of charge of dust particles depends on the size of the dust particles and is related to temperature and humidity, the charge increases when the temperature increases, and the charge decreases when the humidity increases. (4) The density of the dust. The mass per unit volume of dust is called the density of the dust, and the volume of dust referred to here, excluding the voids between the dust particles, is called the true density of the dust.

5) The resting angle of the dust. The angle of repose of dust is an important index to evaluate the fluidity of dust. (6) The best nature of coal dust.

After the coal is crushed into fine coal dust, the specific surface area is greatly increased, and the free surface energy of the system is also increased accordingly, which improves the chemical activity of coal dust, especially the ability to oxidize and generate heat.

The most important factor in the production of coal powder is the surface moisture of the material, it is the biggest factor affecting the dust, when the surface moisture is equal to 7%, it is a turning point of the amount of dust, when it is greater than 7%, the amount of dust decreases rapidly, at 10%, the visible dust will not be produced basically, and when the surface moisture reaches 13%, there is basically no dust generated.

The surface moisture capacity of the material can be used as an indicator for the dust control design of the coal conveying system, which can guide the dust pollution and improve and strengthen the dust removal design measures.

Preventing Coal Dust Ignition** – Best Precautions:

Improve the dust-proof water supply system to ensure that the water is sufficient.

Dust-proof water pipes should be laid to all locations that can generate and deposit dust, and water supply pipelines should be laid in underground mining areas and working faces as required to ensure normal water supply. In the roadway that needs to be washed and sprayed with water, a three-way valve is installed every l00m in the main transportation lane and return air lane; A three-way valve is installed every 50m between the belt conveyor lane and the inclined shaft of the belt conveyor.

In the roadway that needs to be flushed with water, set up a three-way valve in accordance with the pipeline installation requirements, and install a special soft water pipe with a length of not less than 50m and matching the three-way valve joint in time. The belt conveyor roadway and the inclined shaft of the belt conveyor should be equipped with at least a 25m long flushing roadway and fire-fighting soft water pipe on the three-way valve from the roadway.

Water supply pipelines should be inspected frequently, and problems should be dealt with in a timely manner.

Measures to prevent coal dust from accumulating and flying.

The 730 rail transportation alley, the underground parking lot and the 730 belt transportation alley are whitewashed once a year by the mechanical and electrical department.

The excavation face and other roadways shall be washed by the responsible unit in time according to the scope of the roadway division to clean up the dust.

Each excavation face must implement various dust-proof measures such as spraying, purifying water curtains, cannon spraying, internal and external spraying of roadheaders, and dust curtains. The ** drop of the belt conveyor shall not be exceeded, and when it is exceeded, a suitable chute or guide plate should be installed for transmission.

When the original natural moisture of the coal seam in the coal mining face is less than 4%, water injection and dust prevention measures should be taken in the coal seam.

The fully mechanized excavation face must be equipped with a dust removal fan and insisted on using it in accordance with the requirements, and the fully mechanized mining face must be equipped with a hydraulic support automatic spraying system.

All excavation faces are equipped with water pressure and water volume observation tables.

Measures to prevent coal dust from igniting and detonating.

Eliminate open flames and eliminate electrical ignition sources.

Strengthen the observation of natural fire in the exposed coal seam and prepare emergency measures.

Strict management of guns to prevent coal dust accidents caused by guns.

Eliminate the ignition source caused by friction and impact.

Strengthen gas management to prevent coal dust caused by gas.

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