Coal mine dust is produced by various coal particles and rock particles in the process of coal production. Some mineral dust will fly in the air to form floating dust. According to the impact of coal mine dust on human body, coal mine dust can be divided into respiratory dust and non respiratory dust. How to deal with coal mine dust?
Respirable dust is characterized by dust particle size less than 7 μ m. When the human body inhales this kind of dust, it will deposit in the lungs of the inhaler, causing great damage to the body.
The first links where coal dust will occur at the coal mining face include coal falling, coal breaking, coal transportation, hydraulic support transfer, transportation transfer, blasting, artificial shovel coal and coal drawing at the coal drawing mouth. The dust in conflict is characterized by large particles and large quantity, while the dust thrown is mostly respiratory dust.
Dust treatment
Conflict is the primary mechanism of coal mine dust. In order to reduce the amount of coal mine dust, it is necessary to often replace the coal producing pick and pay attention to the sharpness of the pick.
The first links of coal mine dust at the heading face include mechanical coal breaking, blasting, coal loading, bolting and shotcreting, and loaders. Generally speaking, the coal mine dust occurring on the rock roadway driving face contains a lot of free silica, which is harmful to human body.
There is also high concentration of dust at coal loading and unloading points. Instantaneous mine dust concentration can occur at the coal loading and unloading point, and may even reach the concentration limit of coal dust blasting. Coal mine dust treatment is more important.
The combination of sound insulation and sound absorption is generally adopted in the noise management of industrial plants to avoid affecting the normal rest of residents near the plant. Therefore, noise management in industrial plants is important. How to manage noise in industrial plants?
Double window structure shall be used for noise management. Install another one on top of the original single-layer glass. Re install glass windows with good quality and high sound insulation. Sound insulation doors shall be selected for the doors in the plant, and all gaps shall be treated tightly with seam tape.
The noise frequency in the plant is high and the loudness is large. It is simply refracted repeatedly and radiated to the surrounding environment. Keep the original wall, and add wooden keel to fill in the sound insulation data after the sound insulation board is pasted outside.
Noise management
Dismantle the original wall, install the sound insulation board on both sides and fill with sound absorbent cotton. Compared with the former, the sound insulation effect is the same, only different in space.
The purpose of sound insulation and noise reduction can be achieved by making a sound insulation room, but the doors and windows on the sound insulation room should also use sound insulation doors and windows, and set ventilation ducts to ensure the normal heat dissipation and cooling of indoor mechanical equipment.
The noise sources in industrial plants are complex, and appropriate methods should be adopted to achieve reasonable sound insulation and noise reduction.
