首页|Field assessment of control techniques and long-term dust variability for surface coal mine rock drills and bulldozers
Field assessment of control techniques and long-term dust variability for surface coal mine rock drills and bulldozers
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
NSTL
Airborne respirable dust surveys were conducted atsix surface coal mines to investigate the effectiveness of dustcontrol methods used on rotary rock drills and bulldozers. Dustcontrols commonly used on drills include a dry dust collectionsystem, exhausting from a shrouded area around the collared hole,and an enclosed drill operator cab, filtering airborne dust fromthe cab. Bulldozers arc also typically equipped with an enclosedoperator cab as a dust control measure. Airborne respirable dustsampling was conducted near each equipment's source ofgeneration and inside its enclosed cab. Silica analysis wasperformed on the dust samples to determine the percent silicacontent in the dust generated at the six mining operations. Anadditional eight-month follow-up of dust sampling was alsoconducted in the enclosed operator cabs of several rock drills andbulldozers. Data were analyzed for long-term variability ofaccepted control methods to abate dust and silica levels.The highwall rock drill was the major and most variable dustsource as compared to the bulldozer, generating dust levels, onaverage, one order of magnitude higher than dust levels of thebulldozer. Four of the six drills surveyed had dust containmentand capture problems at the shrouded drill table above the hole.Repairs or modifications to three of the drill dust collectionsystems were shown to reduce dust levels by more that 50 percentnext to the shrouded drill table. The enclosed operator cabsprovided more than 90 percent and more than 40 percent lowerdust levels than at the dust source for the drill and bulldozer,respectively. Long-term sampling of several of these highwalldrills and bulldozers showed that the dust levels in the drill cabswere frequently higher than 0.2 mglm~3 and more variable thanin the bulldozers. The bulldozer dust levels were frequentlybelow 0.2 mg/m~3. Future research should focus on improvingsome of the deficiencies present in the drill's primary dustcollection system, and developing quality control methods toensure the integrity of enclosed cab protection for equipment operators.
J.A.Organiscak、S.J.Page
展开 >
1999
International journal of surface mining, reclamation and environment
NSTL
