二氧化硅对污泥烧结陶粒结构强度和孔隙率的影响
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摘要
市政污泥富含金属氧化物可以促进结晶体的形成,高温下有机质产气可以作为成孔剂,同时发热有利于内部烧结温度的提高,污泥作为原料有利于烧制陶粒。研究结果表明,烧结陶粒强度较高的化学成分配比为:SiO262%、Al2O314%、其他氧化物24%。此时陶粒强度为4.89 MPa,颗粒密度为1320 kg/m3,符合GB/T 17431.1—2010《轻集料及其试验方法第1部分:轻集料》对800级人造轻集料的要求。试验细化了陶粒内SiO2、Al2O3及其他氧化物组分建立的三角相图。烧结的最佳温度为1050℃。污泥烧结中释放热量有利于高温产生流动相和小孔汇聚,但是污泥放气会对小孔汇聚产生扰动,二者之间相互抗衡,由此提出污泥陶粒烧结中孔隙和结构形成的假设。
Municipal sludge is rich in metal oxides to promote the formation of crystals. At high temperatures,organic matter gas can be used as a pore forming agent,and released heat is beneficial to the increase of internal sintering temperature. So sludge sintered is beneficial to the preparation of ceramsite. The results show that the sintered ceramsite has the higher strength in the zone:SiO2=62%,Al2 O3=14%,other oxides =24%. The strengths is 4.89 MPa,and the grain density is 1320 kg/m3,which meets the requirements of GB/T 17431.1—2010 "Lightweight Aggregates and Its Test Method Part 1:Lightweight Aggregates" for 800-grade artificial light aggregate. The triangular phase diagram established by SiO2,Al2 O3 and other oxidized components in the ceramsite is refined. The optimum temperature for sintering is 1050 ℃. The release of heat during sludge sintering facilitates the formation of liquid phases and the accumulation of small pores therein at high temperatures. However,the gas released from combustion of the sludge will disturb the small pores convergence,and the two effects will compete with each other. Therefore,the assumption of the formation of internal pores and structures in the sintering of sludge ceramsite is proposed.
Municipal sludge is rich in metal oxides to promote the formation of crystals. At high temperatures,organic matter gas can be used as a pore forming agent,and released heat is beneficial to the increase of internal sintering temperature. So sludge sintered is beneficial to the preparation of ceramsite. The results show that the sintered ceramsite has the higher strength in the zone:SiO2=62%,Al2 O3=14%,other oxides =24%. The strengths is 4.89 MPa,and the grain density is 1320 kg/m3,which meets the requirements of GB/T 17431.1—2010 "Lightweight Aggregates and Its Test Method Part 1:Lightweight Aggregates" for 800-grade artificial light aggregate. The triangular phase diagram established by SiO2,Al2 O3 and other oxidized components in the ceramsite is refined. The optimum temperature for sintering is 1050 ℃. The release of heat during sludge sintering facilitates the formation of liquid phases and the accumulation of small pores therein at high temperatures. However,the gas released from combustion of the sludge will disturb the small pores convergence,and the two effects will compete with each other. Therefore,the assumption of the formation of internal pores and structures in the sintering of sludge ceramsite is proposed.
引文
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[2]张树国,吴志超,张善发,等.上海市污水处理厂污泥处置对策研究[J].环境工程,2004,22(1):75-78.
[3] Andrés A,Ibáez R,Ortiz I,et al.Experimental study of the waste binder anhydrite in thesolidification/stabilization process of heavy metal sludges[J].Journal of Hazardous Materials,1998,57(1-3):155-168.
[4] Xu G,Zou J,Li G.Ceramsite made with water and wastewater sludge and its characteristics affected by SiO2and Al2O3[J].Environmental Science and Technology,2008,42(19):7417-7423.
[5] Acchar W,Vieira F A,Hotza D.Effect of marble and granite sludge in clay materials[J].Materials Science&Engineering A,2006,419(1):306-309.
[6]王乐乐,杨鼎宜,刘亚东,等.轻质污泥陶粒研制及其膨胀机理的探讨[J].混凝土,2013(4):40-43.
[7]杨久俊,张磊,侯雪洁,等.赤泥复合硅酸盐水泥的力学性能及其放射性研究[J].天津城建大学学报,2012,18(1):52-55.
[8] Ma L,Li G Z. Influence of sintering temperature on performance of red mud lightweight ceramsite[J].Advanced Materials Research,2013,662:323-326.
[9] Qin J,Jiao Y,Li X,et al.Sludge char-to-fuel approaches based on the catalytic pyrolysisⅡ:heat release[J].Environmental Science and Pollution Research,2018,36:36581-36588.
[10]刘明伟,刘芳.二氧化硅含量对污泥底泥制备陶粒性能的影响研究[J].东北电力大学学报,2016,36(3):86-90.
[11] Xu G R,Zou J L,Li G B. Ceramsite obtained from water and wastewater sludge and its characteristics affected by(Fe2O3+CaO+MgO)(SiO2+Al2O3)[J].Water Research,2009,43(11):2885-2893.
[12] Riley C M. Relation of chemical properties to the bloating of clays[J].Journal of the American Ceramic Society,2006,34(4):121-128.
[13]翁焕新,章金骏,曹彦圣,等.污泥陶粒的性能特征与烧制工艺[J].浙江大学学报(工学版),2011,45(10):1877-1883.
[14]闫振甲,何艳君.陶粒生产实用技术[M].北京:化学工业出版社,2006.
[15]林子增,黄瑛,谢文理.污泥陶粒制备工艺烧结温度影响研究[J].功能材料,2013,44(z1):89-93.
[16] Yue D,Yue Q,Gao B,et al.Preparation and bloating mechanism of porous ultra-lightweight ceramsite by dehydrated sewage sludge and Yellow River sediments[J].Journal of Wuhan University of Technology,2014,29(6):1129-1135.
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