Abstract: To control the dust emission of iron concentrate powder, chemical components, crystal structure, Zeta potential, SEM morphology and moisture content of Yanshan iron ore concentrate powder were investigated with water-based polymers dust suppressant. The suppressing efficiency in wet and stabilizing effect in dry were discussed. The results showed that dust suppressant promoted agglomeration of particles via crosslinking and H-bonding, improved the moisturizing ability of iron concentrate powder and thus effectively reduced wind erosion. At the temperature of 30 ℃, relative humidity of 35% and polymer dosage of 0.5%, the average moisture content was increased by 1.4 times compared with watering, and at wind rate of 9.5 m/s, the estimated suppressing efficiency in handling and open yard reached 71.43% and 94.86%, respectively. Cohesive forces of aggregates enhanced by polymers, and compressive strength was 0.91 MPa after 28 d, which was 10.6 times of the watering samples. Iron concentrate powder was sealed with dense aggregates surface, which saved water and suppressed dust over half a year. No harmful elements and impurities were induced by polymers. No adverse impacts which influences the future use were caused for the quality of iron concentrate raw materials.

Key words: Iron concentrate powder, Dust emission, Open yard, Suspended particles, PM2.5, Dust suppressant, Water saving