Study on the Spatial and Temporal Distribution and Migration Law of Perforated Dust in Open-Pit Mine
The dust from the open-pit mine is concentrated,and the dust concentration near the operation area is high,which seriously damages the health of the operators.In order to take effective dust suppression measures to reduce the dust concentration near the operation area and improve the environment of open-pit mine perforation operation,it is necessary to explore the spatial and temporal distribution and migration law of drilling dust.The dust generated by the drilling rig perforation operation was collected on site,and the Malvern particle size analyzer was used for analysis to obtain the particle size distribution data of dust samples.On this basis,according to the gas-solid two-phase flow theory,the Euler-Lagrangian research method was adopted,SolidWorks modeling was used,and the numerical simulation software Fluent was used to analyze the spatial and temporal distribution and migration of drilling dust.It is found that during the drilling operation,the dust particles are sprayed out from the bottom of the hole to the orifice at high speed,and the dust particles with a particle size of more than 150 pm basically settle within 20 m of the wind direction of the borehole.Most of the dust particles less than 150μm diffuse to the outside of the stope with the wind flow,and a small part settles on the ground of the stope.The dust mass concentration increases rapidly with time,then stabilizes in a certain concentration range for a period of time,and finally decreases rapidly.The dust concentration monitor was set at the height of the breathing zone in the stope air flow direction.The monitoring results show that the dust mass concentration reaches the maximum value of 341 mg/m3 rapidly with the distance,then decreases rapidly to 189 mg/m3,and finally decreases slowly.The field test results show that the dust concentration is basically consistent with the numerical simulation analysis results,which verifies the feasibility of using the discrete phase model to simulate the dust migration in the open-pit mine.
Open-pit mineDrilling dustDistribution characteristicsMigration law
万方数据
维普
