Numerical simulation of dust diffusion behavior after blasting in open-pit mine

In order to obtain the behavior of dust diffusion after blasting, dust concentration tests were conducted at an open-pit mine blasting site. ANSYS FLUENT was used to study the dust dispersion trend after blasting, and the numerical simulation results were consistent with the measured data trends. Some results are obtained: the airflow tends to produce some large vortices at the entrance and bottom of the mine; there are a large number of vortices in the vertical direction of the airflow movement, which makes the air flow very complicated and causes great obstruction to the airflow; influenced by air flow, the dust diffusion after blasting experienced complex processes such as rising, diffusion, separation and sedimentation; some small particles are difficult to settle and could only be discharged by ventilation. After 20 minutes of ventilation, the dust concentration at the measured point dropped from 59 mg/m ³ to 0.01 mg/m ³ , and the impact range and concentration of dust are greatly reduced.