Preparation And Properties Of Compound Dust Suppressant On Construction Site

In recent years,the problem of air pollution in some parts of China has become increasingly severe,and smog weather has repeatedly erupted.The various suspended particulates exceeding the standard in the atmosphere are the main causes of smog.Monitoring shows that dust pollution caused by construction sites has become one of the main causes of haze weather.According to statistics,the dust suppressant researched at home and abroad is mainly for coal dust,mine dust and road dust.The dust suppressant suitable for dust on the construction site is relatively small,especially the composite dust suppressant suitable for dust on the construction site.Therefore,it is urgent to study the compound dust suppressor at the construction site.This paper takes the Ministry of Railways Dust Control Industry Standard(GB/T 3210)as the standard,and determines the optimal ratio of composite dust suppressant on the construction site through single factor test and response surface test design model.The composite type is prepared.The dusting agent has the characteristics of water retention,cohesiveness and surface activity,and has passed the performance test and application test to verify the excellent dust suppression effect of the composite dust suppressant at the construction site.Firstly,through the method of single factor test,taking water retention,cohesiveness and surface activity as reference,under the premise of satisfying its function,the test raw materials which are non-toxic,harmless,easy to obtain,low in price and will not cause secondary pollution are selected.The triethanolamine(A-2)with the best water retention effect is selected as the water retention agent raw material of the composite dust suppressant,and the polyacrylamide(B-1)is the raw material of the binder,sodium dodecyl benzene sulfonate(C-3)is a surfactant.By establishing a response surface test design model,the optimal ratio of each component of the composite dust suppressant is optimized: 2.5%triethanolamine(A-2),2.0% polyacrylamide(B-1)and 1.0% the sodium dodecyl benzene sulfonate(C-3),and the design verification test verified the established model,the predicted value is close to the experimental value,indicating that it is reasonable to apply the sound test design model to optimize the ratio of the composite dust suppressant.The performance of the composite dust suppressant on the construction site was characterized.The dust suppressor has a pH of 7.10,and a viscosity of 51.59 mPa·s.The water retention effect was excellent and the evaporation resistance was good.After spraying the dust suppressant The wind erosion rate is 10m/s,the wind erosion rate is 0.04% at 30 m/s,the wind erosion rate is 0.12% at 10m/s,and the wind erosion rate is 10.00% at 30 m/s.In the case of the net,the wind erosion rate of 10 m/s reached 4.67%,and the wind erosion rate of30 m/s reached 53.54%.The composite dust suppressant is non-toxic,harmless,non-irritating and non-toxic,and has a freezing point of-4°C.Corrosion test results show that the corrosionrate of the composite dust suppressant is similar to that of distilled water.By conducting a pilot test to monitor the concentration of TSP in the atmosphere of the spray dust suppressant,the reduction rate of TSP concentration is about 70%.The composite dust suppressant can effectively suppress the pollution of the surrounding environment by the construction site dust.Based on the analysis of the economic benefit of the compound dust suppressant,the economic performance of the dust suppressant in construction site is obviously better than that of sprinkling water and covering dust net,which saves the economic cost and greatly improves the effect of dust control.In summary,the composite dust suppressant for building construction site developed in this paper has better dust suppression effect.