消除沥青混凝土中H_2S的理论及实践研究
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摘要
硫磺改性沥青可在有效提高沥青混凝土理化性能的同时,降低原材料成本。为解决添加硫磺后H_2S气体过量排放的问题,在第一步研究了改善硫磺高温稳定性的基础上,作为减少H_2S气体排放研究的第二步,通过在硫磺中添加Fe_2O_3等纳米颗粒和赤泥微粉进行改性。研究结果表明,通过在碱性环境下将FeCl_2饱和水溶液在硫磺粉末中进行加热搅拌水解蒸发,可在硫磺中获得直径约数百纳米左右的分散性良好的纳米Fe_2O_3颗粒。在沥青混凝土制备过程中,纳米Fe_2O_3颗粒可有效地在140℃左右与H_2S进行反应,生成高熔点的FeS,从而达到有效降低H_2S等有害气体释放的目的。实验室H_2S气体排放检测结果表明,本研究的硫磺沥青改性剂(简称GL改性剂)的有害气体释放水平与基质沥青混凝土制备时的释放水平基本相当。
Sulfur modified asphalt can effectively improve the physical and chemical properties of asphalt concrete and reduce the cost of the material.In order to solve the problem of excessive emission of H_2S gas after adding sulfur,following the improvement of high temperature stability of sulfur,as the second step of the study,asphalt is modified by adding nano-particles such as Fe_2O_3 and red mud in this paper.Fe_2O_3 particles with good dispersion of about hundreds of nm can be obtained by hydrolyzing and heating the FeCl_2 saturated aqueous solution in the alkaline environment made by red mud.Nano-Fe_2O_3 particles can effectively react with H_2S at about 140℃temperature to eliminate the release of the harmful gases.Laboratory tests also show that the harmful gas release level of the sulfur asphalt modifier(GL modifier for short)is equivalent with the pure asphalt concrete.
Sulfur modified asphalt can effectively improve the physical and chemical properties of asphalt concrete and reduce the cost of the material.In order to solve the problem of excessive emission of H_2S gas after adding sulfur,following the improvement of high temperature stability of sulfur,as the second step of the study,asphalt is modified by adding nano-particles such as Fe_2O_3 and red mud in this paper.Fe_2O_3 particles with good dispersion of about hundreds of nm can be obtained by hydrolyzing and heating the FeCl_2 saturated aqueous solution in the alkaline environment made by red mud.Nano-Fe_2O_3 particles can effectively react with H_2S at about 140℃temperature to eliminate the release of the harmful gases.Laboratory tests also show that the harmful gas release level of the sulfur asphalt modifier(GL modifier for short)is equivalent with the pure asphalt concrete.
引文
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[5]杨现茂,张晓华,张蓉.硫磺改性沥青混合料路用性能探讨[J].西南公路,2011,(2):2-6.
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[7]祥芹,黄晓双,刘斌清.硫磺沥青路面技术在广西的应用前景分析[J].西部交通科技,2011,51(10):14-17.
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[9]葛守飞,张洪亮.纳米改性沥青综述[J].公路交通科技,2013,(11):39-44.
[10]Ruoyu Li,Feipeng Xiao,Serji Amirkhanian,Zhanping You,Jia Huang.Developments of nano materials and technologies on asphalt materials-A review[J].Construction and Building Materials,2017,(143):633-648.
[11]沈洪波,张辉,刘应书,等.改性Fe2O3脱硫剂脱除H2S反应特性[J].环境工程学报,2015,(9):4458-4464.
[12]张金升,张贤军,庞来学,等.氯化铁水溶液和氯化亚铁水溶液性能研究[J].山东交通学院学报,2012,20(1):81-86.
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[15]J A迪安.兰氏化学手册:第二版[M].北京:科学出版社,2003.