Preliminary Characterization of Respirable Rock Dust Generated from Cutting Potash in Laboratory Full-Scale Tests with Radial Picks at Different Stages of Wear  

作　　者：Syd Slouka Muhammed Ishaq Jurgen Brune Jamal Rostami Candace Tsai Evan Sidrow 

机构地区：[1]Department of Mining Engineering,Colorado School of Mines,Golden 80401,Colorado,USA [2]Earth Mechanics Institute Colorado School of Mines,Golden 80401,Colorado,USA [3]Department of Environmental Health and Industrial Hygiene,University of California Los Angeles,Los Angeles 90095,California,USA [4]Department of Statistics,University of British Columbia,Vancouver V6T 1Z4,Canada

出　　处：《Journal of Environmental Science and Engineering(A)》2022年第6期213-229,共17页环境科学与工程（A）

摘　　要：Airborne rock dust poses serious long-term health effects to workers in mining and tunneling underground rock environments.When inhaled,respirable crystalline silica particles commonly found in quartz and other minerals will scar sensitive lung tissue and cause irreversible lung diseases.Characteristics such as concentration,type of mineral,particle size,and particle shape can harm workers to various extents.Therefore,this study characterizes airborne rock dust particles that are released from mechanically cutting rock.Laboratory full scale linear cutting tests on samples of potash rock were performed with radial picks to generate dust and were collected with various instruments,including Dorr-Oliver cyclones.Three stages of pick wear were tested:new,moderately worn,and severely worn.Comparisons between different stages of pick wear to dust concentration,size distribution,and particle shape characteristics are drawn from this preliminary study using analytical methods,field-emission scanning electron microscope image capture techniques,and laser diffraction.Although further testing needs to be conducted to make viable and concrete conclusions,a review of the test results reveals a strong tendency in generated airborne and deposited dust to be linked to the bit tip wear,which was influenced by tip surface area geometry,such as a sharp tip,blunt tip,or undulating sharp tips.The moderately worn pick,or the pick with the bluntest tip,in these experiments released the highest concentration of dust.The moderately worn(bluntest)pick also generated particle shapes with the highest aspect ratio compared to the other two picks.Additionally,in terms of the particle size distributions,all the picks generated airborne particle size mean values between 0.7 and 1.2µm in aerodynamic diameter.As for deposited particle size distributions,all the picks generated particles with the mode of particle aerodynamic diameter sizes at 13µm.In the end,the results of this preliminary study paired with future testing can confirm and eventua

关 键 词：Respirable rock dust particle size distribution particle shape dust concentration 

分 类 号：TG1[金属学及工艺—金属学]