Respirable dust poses long-term health issues to personnel working in mining and civil projects where mechanized mining and tunneling machines are used for hard rock excavation. Machines, such as longwall shearers, roadheaders, or continuous miners, use consumable picks to cut rock. However, rock dust is generated in the work environment each time the pick tip contacts the rock surface. Additionally, the generated dust can be reintroduced into the air further down in production, such as at transfer points. The purpose of this study is to characterize respirable dust particles generated at the pick tip at two stages of pick wear: new and moderately worn. Understanding dust characteristics in terms of concentration, size distribution, and particle shape throughout the life-cycle of the pick will provide a basis to mine and tunnel operators for changing out picks to mitigate dust generation at the source. This paper discusses the dust characteristics generated from preliminary full-scale cutting tests in a laboratory of an igneous rock block cut with conical picks at new and moderately worn levels of wear. The moderately worn pick generated a size distribution that favored smaller particle sizes compared to the new pick. The moderately worn pick also generated more overall dust, as the concentration level in mg/m³ was over double the amount of the new pick. Lastly, both picks generated particles that had similar aspect ratios and roundness measures.

可吸入粉尘对在使用机械化采矿和隧道掘进机进行硬岩挖掘的采矿和民用项目中工作的人员构成长期的健康问题。长壁采煤机、掘进机或连采机等机器使用消耗性镐来切割岩石。然而，每次镐尖接触岩石表面时，都会在工作环境中产生岩石粉尘。此外，产生的粉尘可以在生产过程的更下游重新引入空气中，例如在转运点。本研究的目的是描述在截齿磨损的两个阶段在截齿尖端产生的可吸入灰尘颗粒：新的和中度磨损的。从浓度、粒度分布等方面了解粉尘特性，截齿整个生命周期中的颗粒形状和颗粒形状将为矿山和隧道运营商更换截齿以减少源头产生的粉尘提供基础。本文讨论了在实验室进行的初步全面切割试验中产生的粉尘特性，该试验采用锥形截齿在新的磨损和中等磨损水平下切割火成岩块。与新的截齿相比，适度磨损的截齿产生的粒度分布有利于更小的颗粒尺寸。适度磨损的镐也产生了更多的整体粉尘，因为浓度水平以 mg/m 与新的截齿相比，适度磨损的截齿产生的粒度分布有利于更小的颗粒尺寸。适度磨损的镐也产生了更多的整体粉尘，因为浓度水平以 mg/m 与新的截齿相比，适度磨损的截齿产生的粒度分布有利于更小的颗粒尺寸。适度磨损的镐也产生了更多的整体粉尘，因为浓度水平以 mg/m³是新选秀权的两倍多。最后，两个拾取器都生成了具有相似纵横比和圆度测量值的粒子。