Airborne Dust from Taconite Tailings.
Yardley-DH; Lacabanne-WD; Nelson-RC
NTIS: PB/82-143173 :53 pages
The objective of this report was to evaluate a variety of dust suppressants to determine their effectiveness in mitigating dust from taconite tailings. Field test plots were established on taconite tailings and wind tunnel laboratory tests were conducted. The tests consisted of comparing treated and untreated samples at wind velocities of 40 mph using a weight-loss method and direct dust emission measurements. It was shown that the emission of fine dust from taconite tailings in the 4.5- to 0.85-Micrometer range could be reduced by 99 pct using certain chemical suppressants. It was also shown that a straight water spray on coarse tailings reduced dust emission by 95 pct. Although eight different chemicals were tested, most of the tests were made using coherex, ammonium lignin sufonate, and sodium silicate. These dust suppressants were used singly and in combination on almost 75 field test plots. The coherex appears to provide the best results in terms of economics and durability. Wind tunnel tests on treated and untreated cu-ni tailings showed that applications of dust suppressants reduced fugitive fine dust by better than 99 pct.
CP; Final Contract Report;
NTIS Accession No.
University of Minnesota