Experimental examination of factors that affect dust generation by using heubach and MRI testers.
Plinke-MA; Maus-R; Leith-D
Am Ind Hyg Assoc J 1992 May; 53(5):325-330
The influence of type of bulk material, particle size distribution of the material, moisture content, and test apparatus on the amounts of dust generated was investigated. Dusts were generated from silicon-carbide (409212) and aluminum-oxide (1344281) by MRI and Heubach dustiness testers that had been modified by adding Andersen impactors. The bulk materials consisted of fine, middle sized, and coarse particles and contained 0.001 to 0.4% moisture. The amounts of dust generated were measured gravimetrically. The particle size distributions were determined from the impactors. The Heubach tester generated about six times as much dust as the MRI tester. Aluminum-oxide and silicon-carbide generated similar amounts of dust with similar particle size distributions in either tester. For materials having the same moisture content, the finer materials produced more dust. The amounts of dust generated and the dust generation rate decreased with increasing moisture content. Moisture content of the bulk material had no effect on the particle size distribution of the generated dust. The size specific generation rate increased with increasing particle diameter. The authors conclude that use of a single dustiness tester is sufficient for investigating factors that affect dust generation and particle size distribution. The chemical properties of a dusty material are less important for dust generation than physical properties such as moisture content or particle size distribution. The amounts of dust generated decrease with increasing moisture content of the bulk material for all particle sizes. Dust suppression can best be accomplished by adding moisture to the bulk material.
NIOSH-Publication; NIOSH-Grant; Control-technology; Dust-particles; Industrial-dusts; Dust-analysis; Laboratory-testing; Industrial-hygiene; Dust-suppression
Epidemiology Univ of North Carolina Rosenau Hall 201 H Chapel Hill, NC 27514
American Industrial Hygiene Association Journal
University of North Carolina Chapel Hill, Chapel Hill, North Carolina