Directional synthesis of zeolites with silicon and aluminum dissolved from fly ash
-
摘要: 基于水热合成沸石条件下研究获得的内蒙古乌海乌云电厂粉煤灰和呼和浩特呼一电厂粉煤灰中硅、铝的溶出规律,添加适量外源硅、铝调配硅铝比,采用水热合成法定向合成A型和X型沸石,采用XRD鉴定了合成产物,考察了碱度对沸石合成的影响.结果表明:两种粉煤灰中硅的溶出量随时间延长而增加,而铝的溶出量先增加后减小,可溶出的硅、铝量远小于粉煤灰组成中的硅、铝含量;碱度的增加有利于A型沸石晶核的形成和生长;此外,还定向合成了X型沸石.论文研究证实,水热合成条件下粉煤灰中溶出的有效硅、铝才是合成沸石时可利用的有效成分,以溶出的硅铝量指导水热合成,可定向合成出多型沸石.Abstract: Two fly ashes were sampled from Wuhai Wuyun power plant and Hohhot Huyi power plant,respectively.Dissolution characteristics of Si and Al from these fly ash samples at hydrothermal synthesis circumstance were studied,and then they were used as a guide to adjust the SiO2/Al2O3 molar ratio of gel system,as a result A-zeolite and X-zeolite were synthesized directionally by hydrothermal synthesis method.X-ray diffraction (XRD) was used to identify the type of zeolite.Effect of alkalinity on the synthesis of zeolite was investigated.The results show that the amount of Si and Al dissolved from fly ash are much less than that in the chemical composition of fly ash;with the increase of dissolution time,amount of dissolved Si increases,while amount of dissolved Al rises first and drops later.Higher alkalinity is beneficial to the formation and growth of A-zeolite crystal nucleus.Besides,X-zeolite also can be synthesized directionally.It could be concluded that it is the Si and Al dissolved from fly ash at hydrothermal circumstance that are available components in the hydrothermal synthesis of zeolite,under guide of which a variety of zeolites can be synthesized directionally.
-
Key words:
- fly ash /
- alkaline dissolution /
- directional synthesis /
- zeolites
-
[1] 张利萍,付克明.Si/Al等因素对粉煤灰水热合成沸石种类的影响研究[J].硅酸盐通报,2010,29(4):940-943. [2] Zhang Liping,Fu Keming.Influence analysis of Si/Al on species of synthesizing zeolites with hydrothemal method from fly ash[J].Bulletin of the Chinese Ceramic Society,2010,29(4):940-943. [3] 杨文焕,张雪峰,郭俊温,等.粉煤灰合成P型沸石及其对氨氮吸附性能研究[J].硅酸盐通报,2012,31(6):1559-1563,1575. [4] Yang Wenhuan,Zhang Xuefeng,Guo Junwen,et al.Study on adsorption performance of ammonia nitrogen by P-style zeolite synthesized from fly ash[J].Bulletin of the Chinese Ceramic Society,2012,31(6):1559-1563,1575. [5] Izidoro J D C,Fungaro D A,Abbott J E,et al.Synthesis of zeolites X and A from fly ashes for cadmium and zinc removal from aqueous solutions in single and binary ion systems[J].Fuel,2012,103(1):827-834. [6] 崔杏雨,张徐宁,陈树伟,等.利用粉煤灰合成4A沸石分子筛的研究[J].太原理工大学学报,2012,43(5):539-543. [7] Cui Xingyu,Zhang Xuning,Chen Shuwei,et al.Synthesis of zeolite 4A from coal fly ash[J].Journal of Taiyuan University of Technology,2012,43(5):539-543. [8] Inada M,Eguchi Y,Enomoto N,et al.Synthesis of zeolite from coal fly ashes with different silica-alumina composition[J].Fuel,2005,84(2/3):299-304. [9] 代红艳,王霞,王增长.粉煤灰制备沸石分子筛及处理废水的研究现状[J].科技情报开发与经济,2008,18(34):81-82. [10] Dai Hongyan,Wang Xia,Wang Zengzhang.The present situation of synthesizing the zeolites with fly ash and the treatment of waste water[J].Sci-tech Information Development & Economy,2008,18(34):81-82. [11] 曾正中,李勃,南忠仁.陈化时间及灰水比对粉煤灰合成A型沸石的影响[J].煤炭科学技术,2009,37(4):124-128. [12] Zeng Zhengzhong,Li Bo,Nan Zhongren.Aging time and ash-water rate affected to fly ash synthesized A type zeolite[J].Coal Science and Technology,2009,37(4):124-128. [13] 王春峰,李健生,韩卫清,等.碱熔融法合成NaA和NaX型粉煤灰沸石的品质表征[J].环境工程学报,2008,2(6):814-819. [14] Wang Chunfeng,Li Jiansheng,Han Weiqing,et al.Property characterization of zeolites NaA and NaX from fly ash using alkaline fusion method[J].Chinese Journal of Environmental Engineering,2008,2(6):814-819. [15] 赵世永.粉煤灰在不同碱源条件下水热合成A型沸石[J].煤炭科学技术,2008,36(4):106-108. [16] Zhao Shiyong.Research on hydrothermal synthesis A type zeolite with fly ash in different alkali source conditions[J].Coal Science and Technology,2008,36(4):106-108. [17] 解强,张子伟,姜晓琳.利用工业废弃物定向制备的人工沸石及其制法和应用:中国,2015 10362911.3[P].2015-11-11. [18] 张子伟,姜晓琳,解强.粉煤灰中硅铝溶出规律及定向合成X型沸石研究[J].硅酸盐通报,2015,34(11):3095-3101. [19] Zhang Ziwei,Jiang Xiaolin,Xie Qiang.Dissolution of silicon and aluminum from fly ash and directional synthesis of X-type zeolite[J].Bulletin of the Chinese Ceramic Society,2015,34(11):3095-3101. [20] 徐如人,庞文琴,屠昆岗,等.沸石分子筛的结构与合成[M].长春:吉林大学出版社,1987:276-305. [21] 中国科学院大连化学物理研究所.沸石分子筛[M].北京:科学出版社,1978. [22] 付克明,朱虹.粉煤灰合成4A分子筛的机理及工艺技术参数分析[J].矿产综合利用,2007(4):38-42. [23] Fu Keming,Zhu Hong.Analysis of the mechanism and technological parameters for synthesizing 4A molecular sieve from coal fly ash[J].Multipurpose Utilization of Mineral Rescoures,2007(4):38-42. [24] 白妮,王爱民,沈朴.浅析粉煤灰沸石合成的影响因素[J].硅酸盐通报,2011,30(6):1343-1348. [25] Bai Ni,Wang Aimin,Shen Pu.Analysis of various influencing factors on the synthesis of zeolite from fly ash[J].Bulletin of the Chinese Ceramic Society,2011,30(6):1343-1348. [26] Chang H L,Shih W H.Synthesis of zeolites A and X from fly ashes and their ion-exchange behavior with cobalt ions[J].Industrial & Engineering Chemistry Research,2000,39(11):4185-4191. [27] 孔德顺,宋说讲,王茜,等.粉煤灰碱熔-水热法制备P型分子筛的研究[J].硅酸盐通报,2016,35(3):922-926. [28] Kong Deshun,Song Shuojiang,Wang Qian,et al.Preparation of P-type molecular sieve from fly ash by alkali melting and hydrothermal method[J].Bulletin of the Chinese Ceramic Society,2016,35(3):922-926. [29] 张中华,王宝冬,孙琦,等.工业固体废弃物粉煤灰制备沸石分子筛的研究[C].2015年中国环境科学学会学术年会论文集,2015:3828-3833. [30] Molina A,Poole C.A comparative study using two methods to produce zeolites from fly ash[J].Minerals Engineering,2004,17(2):167-173. [31] Angell C L,Flank W H.Mechanism of zeolite A synthesis[C].ACS Symposium Series,1977:194-206. [32] 马淑杰,刘孔凡,崔美珍,等.A型沸石的生成机理[J].高等学校化学学报,1984,5(2):158-162. [33] Ma Shujie,Liu Kongfan,Cui Meizhen,et al.Mechanism of zeolite A synthesis[J].Chemical Journal of Chinese Universities,1984,5(2):158-162. [34] 申少华.廉价矿物原料水热法制备沸石分子筛的形成机理与晶体生长模型研究[D].长沙:中南大学,2001.
点击查看大图
计量
- 文章访问数: 578
- HTML全文浏览量: 5
- PDF下载量: 259
- 被引次数: 0