氢氧化钠煅烧活化锅炉底渣的实验研究
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摘要
为了确定锅炉底渣的最佳煅烧活化条件,以氢氧化钠为活化剂对锅炉底渣煅烧活化工艺做了研究。通过扫描电镜(SEM)和X射线衍射(XRD)表征观察了锅炉底渣的微观形貌和锅炉底渣中矿物组成,采用滴定法测定不同煅烧活化条件下所得的活化产物中氧化铝与二氧化硅的溶出率,确定了锅炉底渣的最佳煅烧活化工艺参数:锅炉底渣与NaOH的质量比为1∶1.2、煅烧温度为700℃、保温时间为2.5 h、升温速率为4℃/min。在此工艺条件下,锅炉底渣中莫来石和石英相基本消失,转化为可溶性的硅铝酸钠,锅炉底渣得到充分活化,锅炉底渣中硅铝溶出率最佳。
In order to determine the optimum calcination activation conditions of boiler bottom slag, the activation process for burning boiler bottom slag with NaOH as accessory ingredient was investigated.The micro appearance of boiler bottom slag was tested by SEM and the phases of mineral of boiler bottom slag were characterized by XRD.The dissolution rates of SiO_2 and Al_2O_3 in activation products under different activation conditions were measured by the titration.The experimental results that the optimal parameters were obtained as follows:the mass ratio of boiler bottom slag and NaOH was 1∶1.2,the calcination temperature was 700 ℃,the holding time was 2.5 h,and the heating rate was 4 ℃/min.Under the optimal conditions,the mullite and quartz were basically disappeared and the product was mainly made up of soluble NaAlSiO_4.The boiler bottom slag was activated adequately and the dissolution rates of alumina and silica from boiler bottom slag was the best.
In order to determine the optimum calcination activation conditions of boiler bottom slag, the activation process for burning boiler bottom slag with NaOH as accessory ingredient was investigated.The micro appearance of boiler bottom slag was tested by SEM and the phases of mineral of boiler bottom slag were characterized by XRD.The dissolution rates of SiO_2 and Al_2O_3 in activation products under different activation conditions were measured by the titration.The experimental results that the optimal parameters were obtained as follows:the mass ratio of boiler bottom slag and NaOH was 1∶1.2,the calcination temperature was 700 ℃,the holding time was 2.5 h,and the heating rate was 4 ℃/min.Under the optimal conditions,the mullite and quartz were basically disappeared and the product was mainly made up of soluble NaAlSiO_4.The boiler bottom slag was activated adequately and the dissolution rates of alumina and silica from boiler bottom slag was the best.
引文
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[2]张亮,张洪达.灰渣排放利用中存在的问题以及对策研究[J].环境与生活,2014(18):158.
[3]马兴邦.循环硫化床锅炉灰渣在建材水泥行业中的应用[J].四川水泥,2014(10):139-140.
[4]冉帆.炉渣性质及其污水处理效果的应用研究[D].天津:天津城建大学环境与市政工程学院,2013.
[5]陈龙,王敏,王硕,等.生物质灰渣与化肥配施对土壤性质及油菜生长的影响[J].华中农业大学学报,2011,30(6):727-733.
[6]王丽华,王东升.利用粉煤灰制备氯化铝溶液的实验研究[J].桂林工学院学报,2005,25(2):202-204.
[7]曹君,方莹,范仁东,等.粉煤灰提取氧化铝联产二氧化硅的研究进展[J].无机盐工业,2015,47(8):10-13.
[8]Grzymek J,Derdacka-Grzymek A,Konik Z,et al.The new way of alumina lixiviation from sinters containing 12 Ca O·7 Al2O3in J.Grzymek′s Method[M]∥Light Metals.US:TMS,1988:129-133.
[9]Shigemoto N,Hayashi H,Miyaura K.Selective formation of Na-X zeolite from coal fly ash by fusion with sodium hydroxide prior to hydrothermal reaction[J].Journal of Materials Science,1993,28(17):4781-4786.
[10]蒲维,梁杰,雷泽明,等.粉煤灰提取氧化铝现状及工艺研究进展[J].无机盐工业,2016,48(2):9-12.
[11]程芳琴,王波,成怀刚.粉煤灰提取高附加值有价元素的技术现状及进展[J].无机盐工业,2017,49(2):1-4.
[12]张权笠,梁杰,蒲维等.粉煤灰制备硅酸钙粉体及其性能表征[J].无机盐工业,2017,49(6):69-72.
[13]万亚萌,王宝庆,王丹,等.粉煤灰回收氧化铝工艺研究进展[J].无机盐工业,2016,48(11):7-11.
[14]孙庆锋,王君凤,赵恒延.氟硅酸钾容量法测定二氧化硅的操作要点[J].水泥工程,2005(3):78.
[15]马秀艳,王震,赵孟群.EDTA容量法测定铝锰合金中铝[J].南方金属,2010(4):33-34,37.