水性聚合物对铁矿粉的抑尘性能与现场应用

Dust suppression performance and field application of waterborne polymer on iron ore powder

为控制扬尘污染,采用水性聚合物抑尘剂将澳洲铁矿粉稳定化,表征了铁矿粉的含水率、Zeta电位、表面形貌、化学组成与晶体结构,研究了聚合物的抑尘性能和现场应用效果。结果表明,抑尘剂可促进铁矿粉聚集、提高内聚力,可在湿润状态下延缓水分挥发、干燥状态下紧密封闭粉体,有效降低风力侵蚀性。在30℃、35%相对湿度下的平均含水率比洒水提高了1.2倍,装卸过程和露天堆场估算的扬尘控制效率分别达到67.78%和93.96%。露天料场24 h PM2.5和PM10的控制效率分别为75.0%和80.95%,与估算结果接近;30 d的观察期间,堆体的封闭状态稳定,实现了现场有效抑尘。

In order to control the dust pollution,the Australian iron ore powder was stabilized by waterborne polymeric dust suppressant.The moisture content(MC),Zeta potential,surface morphology,chemical composition and crystal structure of the iron ore powder were characterized.The dust suppression performance and field application effects of the polymer were investigated.The results show that the dust suppressant could promote the powder aggregation and improve the cohesive force,then delay the evaporation of water in the wet state,tightly seal the powder in the dry state,and thus effectively reduce the wind erodibility.The average MC of iron ore powder at 30°C and 35%relative humidity was 1.2 times higher than that of watering.The dust control efficiencies(CE)estimated by handling process and open storage yard were 67.78%and 93.96%,respectively.The CEs of PM2.5 and PM10 after 24 hours were 75.0%and 80.95%,respectively,which was close to the estimated results.During the 30 d observation period,the sealed state of the open storage yard was stable,and the effective dust suppression on site was achieved.