Sustainable Mining and Metallurgy

To effectively control the dust in the working face and ensure the safe and efficient production in the coal mine, taking the fast excavation working face of 20202 return airway in Sunjiacha Longhua Coal Mine as an example, by analyzing the dust production characteristics and dust migration distribution law of the working face, the dust control technology was studied for the main dust source points. The results show that the main dust source of the fast excavation working face of the 20202 return airway is the continuous high-strength cutting and caving impact of the anchor machine drum. The dust in the fully mechanized excavation face enters the eddy current area with the air flow, so that the high concentration dust is mainly concentrated in the eddy current area. The dust concentration exceeds 1000mg/m³, but the dust diffusion range is small in the rear. Furthermore, the organic comprehensive dust control technology system of “dust suppression, dust control and dust removal” was proposed. A fast-connecting air-control dust removal device with a length of 1.5m, a weight of no more than 5kg, a radial air outlet around the periphery, an axial air outlet at the front end, and a simple axial and radial air adjustment was developed, and an airborne negative pressure dust removal system and supporting processes were developed to form a supporting dust prevention technology and equipment. After the application of the above comprehensing treatment technology in the working face, the dust reduction efficiency of the workers at the operating site of the driving anchor machine platform reached 88.1%; the dust reduction efficiency at 4-5m after the bolter is 81.21%, which effectively realizes the comprehensive dust control of the working face.