Zpravodaj Hnědé uhlí 2011, 51(1)

Particle size distribution of resuspendable components of samples taken at brown coal open pit mine in resuspension chamber

Mgr. Martin Civiš¹, RNDr. Jan Hovorka, Ph.D.², RNDr. Devraj Thimmaiah, Ph.D.²

¹ Fyzikální ústav AV ČR, v. v. i.

² Ústav pro životní prostředí, Přírodovědecká fakulta UK

A cylindrical chamber for resuspension of solid particles was constructed (V=0,437 m3, S=3,5 m2, S/V=8,38 m-1) for measuring particle size distribution, counting formed aerosol particles, and withdrawing particle fractions segregated by size. Samples of brown coal, fly-ash, flue gas desulfurization gypsum, and overburden material taken at north-western open pit Nástup were investigated. The samples were pneumatically dispersed in the chamber at defined temperature and humidity conditions (20 °C and relative humidity 50 %). Average particle size distributions were determined. According to measurements, fly-ash and coal powder originating from mine roads showed highest concentration by weight after dispersion in the resuspension chamber.

Keywords: resuspension, coarse aerosol

Published: March 1, 2011  Show citation