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Calculation of risk for workers in dust working site

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Author(s): Slanèo Pavel | Bobro Milan | Geldová Erika

Journal: Acta Montanistica Slovaca
ISSN 1335-1788

Volume: 9;
Issue: 1;
Start page: 41;
Date: 2004;
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Keywords: dustiness risk | cumulative dust dose | respirable portion | factor of fibrogeneous effect | specific harmfulness of mineral dust

ABSTRACT
The fibrogeneous dust is considered as a specific harmful substance in the mine working site. Such kind of dust cumulates in lungs and this fact usually results in lungs dusting, so - called pneumoconiosis. Thus, dustiness risk poses a probability of lungs damage by pneumoconiosis. For the calculation of dustiness risk it is needed to know the following data: the value of average dustiness kC in the working site per a definite time period, the dispersivity of dust “D” (it determines a portion of dust particles with a diameter under 5 µm, so - called respirable particles) and the percentage content of quartz Qr in the respirable grain size fraction.The contribution presents the calculation of dustiness risk “R” according to the equation (1), where “R” is in percentage, “ša” is the analytically specific harmfulness and “KDc” is the total cumulative dust dose received by worker in time of its dust exposure.The total cumulative dust dose is calculated on the basis of the equation (4), where “kc” is the average dust concentration in the assessed time period, t–time of exposure, V –average amount of air inspired by exposed worker per time unit ( standardized on the value of 1,2 m3h-1),10-6-recalculation from mg to kg for “KDc”.If the values of “Qr”, “D” and “kc” during the worker exposure on a definite workplace are constant, the dustiness risk “R” is calculated according to the equation (1) and (5) respectively. In the case of “n” time intervals in that the values “Qr”, “D” and “kc” are known the dustiness risk “R” is calculated according to the equation (7). The total personal risk of worker is given by the equation (8).Conclusively, the influence of parameters change namely “Qr”, “D” and “kc” on the value of dustiness risk per equal time period is reported.
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