Calibration of a modified Sierra Model 235 slotted cascade impactor

Technical Report · Sun Jul 01 04:00:00 EDT 1979

DOI:https://doi.org/10.2172/5798734· OSTI ID:5798734

Knuth, R. H.

For measurements of ore dust in uranium concentrating mills, a Sierra Model 235 slotted cascade impactor was calibrated at a flow rate of .21 m/sup 3//min, using solid monodisperse particles and an impaction surface of Whatman No. 41 filter paper soaked in mineral oil. The reduction from the impactor's design flow rate of 1.13 m/sup 3//min (40 cfm) to 0.21 m/sup 3//min (7.5 cfm) increased the stage cut-off diameters by an average factor of 2.3, a necessary adjustment because of the anticipated large particle sizes of ore dust. The underestimation of mass median diameters, often caused by the rebound and reentrainment of solid particles from dry impaction surfaces, was virtually eliminated by using the oiled Whatman No. 41 impaction surface. Observations of satisfactory performance in the laboratory were verified by tests of the impactor in ore mills.

• Research Organization: Department of Energy, New York (USA). Environmental Measurements Lab.
• OSTI ID: 5798734
• Report Number(s): EML-360
• Country of Publication: United States
• Language: English

Related Subjects

500300* -- Environment
Atmospheric-- Radioactive Materials Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AEROSOLS
CALIBRATION
CASCADE IMPACTORS
COLLOIDS
DATA
DATA COMPILATION
DATA FORMS
DESIGN
DIAGRAMS
DISPERSIONS
DUSTS
ELECTRON MICROSCOPY
EQUIPMENT
FILTERS
FLOW RATE
GRAPHS
INFORMATION
MICROSCOPY
MILL TAILINGS
NUMERICAL DATA
ORES
PARTICLE SIZE CLASSIFIERS
PROBABILITY
RADIOACTIVE AEROSOLS
RADIOACTIVITY
SCANNING ELECTRON MICROSCOPY
SOLID WASTES
SOLS
TABLES
TAILINGS
URANIUM ORES
WASTES