Abstract: The dust production capacity, the dust air flow space-time evolution rules and the particle size distribution at discharge port in the high-deep straight well of Xiadian Gold Mine were analyzed. Among the dust-laden airflow at the discharge port, the proportion of dust with particle size above 10 μm is 7%, while the proportion of dust with particle size below 10 μm is about 93%, and the proportion of respirable dust is high. Based on the on-site ventilation conditions, the size and area of the discharge port and the rule of dust production, the Fluent software was used to simulate the movement track of dust-laden airflow before and after closed dust extraction, and the control measures of closed dust extraction and purification were put forward. After treatment, the total dust concentration at discharging port of the high-deep straight well was reduced from 420 mg/m3 to 8.7 mg/m3 with the dust reduction efficiency of over 97%. Thus, the problem of dust emission pollution at discharging port of the high-deep straight well can be effectively solved.

Key words: Deep straight well, Discharge side, Dust production, Closed dust collection, Dust reduction efficiency