白云鄂博稀土尾矿对半焦助燃脱硝的影响研究
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摘要
针对白云鄂博稀土尾矿利用率低的问题,为拓展其利用范围,研究了白云鄂博稀土尾矿对半焦助燃脱硝的影响。在自制的燃烧平台对稀土尾矿的脱硝效果进行分析,采用热重分析仪对配入不同稀土尾矿比率的半焦试样的着火点、燃尽温度、燃尽时间、综合燃烧特性指数等参数进行了分析,探讨了稀土尾矿的配入量对半焦燃烧性能的影响,同时利用扫描电镜和X射线衍射对燃烧后试样进行对比分析,进一步研究稀土尾矿对半焦燃烧影响的原因,结果表明,稀土尾矿的加入有助于半焦燃烧产物中氮氧化物的减少,在加入适量的稀土尾矿时有助于半焦的燃烧,当稀土尾矿的加入量在20%及以下时其对半焦助燃脱硝效果最好。
Influence of Baiyun Obo rare earth tailings on semi coke combustion and denitration was studied on homemade burning platform. Ignition point, burnout temperature, burning time and burning characteristics of semi-coke samples with different addition of the tailings were investigated by thermal gravimetric analyzer. The combustion residues were analyzed with SEM and XRD. The results showed that addition of the tailings was beneficial to reduce content of nitrogen oxide in semi-coke combustion residues; Adding suitable amount of the tailings improved the combustion of semi-coke; When amount of the tailings was not more than 20%, the combustion-supporting and denitration effect of semi-coke was the best.
Influence of Baiyun Obo rare earth tailings on semi coke combustion and denitration was studied on homemade burning platform. Ignition point, burnout temperature, burning time and burning characteristics of semi-coke samples with different addition of the tailings were investigated by thermal gravimetric analyzer. The combustion residues were analyzed with SEM and XRD. The results showed that addition of the tailings was beneficial to reduce content of nitrogen oxide in semi-coke combustion residues; Adding suitable amount of the tailings improved the combustion of semi-coke; When amount of the tailings was not more than 20%, the combustion-supporting and denitration effect of semi-coke was the best.
引文
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[2] 王鑫,林海,董颖博,张悦,周闪闪,许晓芳.不同磁浮工艺对综合回收某稀土尾矿中稀土、铁、铌和萤石的影响[J].稀有金属,2014,38(5):846-854.Wang X, Lin H, Dong Y B, Zhang Y, Zhou S S, Xu X F.Recovery of rare-earth,iron,niobium and fluorite in rare-earth tailings with different magnetic separation and flotation technologies[J].Chinese Journal of Rare Metals,2014, 38(5):846-854.
[3] 韩华,李保卫,李解,王建英,王介良,张波.基于单因素实验的稀土尾矿浮选工艺优化[J].稀土,2016,37(1):60-67.Han H, Li B W, Li J, Wang J Y, Wang J L, Zhang B.Process optimization in flotation of RE tailings based on single factor experiment[J].Chinese Rare Earths, 2016, 37(1): 60-67.
[4] 俞秀金,林建新.利用稀土尾矿制备高强度高活性氨合成催化剂[J].稀土,2005,26(3):47-51.Yu X J, Lin J X.Preparation of high intensity and activity catalyst for ammonia synthesis using the remnants of rare earth ores[J].Chinese Rare Earths, 2005, 26(3):47-51.
[5] 魏可镁,肖益鸿,詹瑛瑛,蔡国辉.汽车尾气三元催化剂及其制备方法[P].中国:CN 1413769,2003-04-30.Wei K M, Xiao Y H, Zhan Y Y, Cai G H.Automobile tail gas three-way catalyst and its preparation method[P].Chinese: CN 1413769, 2003-04-30.
[6] 白丽.白云鄂博稀土尾矿焙烧—氯化反应的研究[D].沈阳:东北大学,2008.Bai L.Roast decomposition and chlorination of baiyunebo tailings[D].Shenyang:Northeastern University, 2008.
[7] 张光伟,崔学奇.我国稀土尾矿资源的综合回收利用现状及展望[J].矿业研究与开发,2012,32(6):116-119.Zhang G W, Cui X Q.Current status and prospect of comprehensive recovery and utilization of rare earth tailings in China[J].Mining R&D, 2012, 32(6):116-119.
[8] 周洪萍,曾人杰.CuO对ZnO-Bi2O3-B2O3系玻璃结构及热处理结果影响[J].陶瓷学报,2010,31(4):568-575.Zhou H P, Zeng R J.Effects of CuO on structure and heat treatment of ZnO-Bi2O3-B2O3 glasses[J].Journal of Ceramics, 2010, 31(4): 568-575.
[9] Liu H Q, Wei G X, Liang Y, Dong F Y. Glass-ceramics made from aro-melting slag of waste incineration fly ash[J].J Central South Univ Technol, 2011, 18(6): 1945-1952.
[10] Lu H X, He M, Liu Y Y, Guo J F, Zhang L W, Chen D L, Wang H L, Xu H L, Zhang R. A preparation and performance study of glass-ceramic glazes derived from blast furnace slag and fly ash [J]. J Ceram Process Res, 2011, 12(5): 588-591.
[11] 王磊,马建新,谢敏明,张益群,周伟. 稀土氧化物上SO2和NO的催化还原(Ⅲ)——用CO作还原剂的同步脱硫和脱氮[J].高等学校化学学报,2002,23(5):897-901.Wang L, Ma J X, Xie M M, Zhang Y Q, Zhou W.Catalytic reduction of SO2 and NO by CO on rare earth oxides(Ⅲ)——simultaneous reduction by using CO as reducing agent[J].Chemical Journal of Chinese Universities, 2002, 23(5): 897-901.
[12] 欧阳曙光,王志,付乐乐,许杰,杨超,吕青青.焦化除尘灰的燃烧性研究[J].广东化工,2012,39(229):23-25.Ouyang S G, Wang Z, Fu L L, Xu J, Yang C, Lv Q Q.Study on the combustibility of coking fly ash[J].Guangdong Chemical, 2012, 39(229): 23-25.
[13] 唐强,王丽朋,闰云飞.富氧气氛下煤粉燃烧及动力学特性的实验研究[J].煤炭转化,2009,32(3):55-59.Tang Q, Wang L P, Run Y F.Study on combustion and kinetic characteristics of pulverized coal in oxygenenriched environments[J].Coal Conversion, 2009, 32(3): 55-59.
[14] 王志.干熄焦除尘灰的高炉喷吹性能研究[D].武汉:武汉科技大学.2013.Wang Z. Research on injection performance of CDQ ash injection into BF[D].Wuhan:Wuhan University of Science and Technology. 2013.
[15] 葛仕福,赵培涛,李扬,闫伟伟,陈振乾.污泥-秸秆衍生固体燃料燃烧特性[J].中国电机工程学报,2012,(32)17:110-116,152.Ge S F, Zhao P T, Li Y, Yan W W, Chen Z Q.Combustion characteristics of sewage sludge-straw derived fuel[J].Proceedings of the CSEE, 2012, 32(17): 110-116,152.