NIOSHTIC-2 Publications Search
Addition of agglomerating agents for atmospheric dust suppression.
Am Ind Hyg Assoc J 1985 Jan; 46(1):B12
A technique was investigated for dust suppression in the processing of silica (14808607) sand and flour. Agglomerating agents were added to the product during milling, packing and handling. In one operation, Micro Foam was added as the agglomerating agent to sand during its transfer through the sand screening building via enclosed conveyor belt. A mixture of compressed air, water and Micro Foam was nebulized into the silica sand conveyor stream. Foam bubbles were formed which were between 100 and 200 microns in diameter and which intercepted fine dust particles and agglomerated them into larger, heavier, nonrespirable particles. At a point 4 feet downstream from the foam nozzle, Micro Foam reduced respirable dust levels by 20 percent. A 65 percent reduction was seen inside the hopper of a covered bulk loading railroad car. At another facility, water added at 1.5 percent by weight was the agglomerating agent at flour bag filler spouts during the packing of 100 pound bags. Respirable dust emissions were reduced through the formation of agglomerates from fine dust particles by more than 60 percent at packer stations and by about 85 percent at other bag handling stations, giving final concentrations of 40 micrograms/cubic meter (microg/m3) at packer stations and 50microg/m3 at conveyor belt unloading stations. There was less effective reduction of dust during manual loading of bags into box cars, with only a 23 percent reduction being achieved, reducing the level to about 1150microg/m3. The author suggests that these methods would be useful for control of other dust hazards where agglomerating agents would not interfere with further processing.
NIOSH-Author; Dust-control; Silica-dusts; Particulate-dust; Air-sampling; Quartz-dust; Respirable-dust; Airborne-dusts
Issue of Publication
American Industrial Hygiene Association Journal
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division