氨氮废水处理用新型沸石化陶粒的制备  

Preparation of Novel Zeolitization Ceramsite for Ammonia Nitrogen Wastewater Treatment

作　　者：王宁 陈宇昕[1,2,3] 徐文盛 安胜利 彭军[1,2,3] 彭继华 WANG Ning;CHEN Yuxin;XU Wensheng;AN Shengli;PENG Jun;PENG Jihua(School of Material and Metallurgy,Inner Mongolia University of Science and Technology,Baotou 014010,China;Inner Mongolia Autonomous Region Key Laboratory of Advanced Ceramic Materials and Devices,Baotou 014010,China;Key Laboratory of Green Extraction&Efficient Utilization of Light Rare-Earth Resources,Ministry of Education,Baotou 014010,China)

机构地区：[1]内蒙古科技大学材料与冶金学院,包头014010 [2]内蒙古自治区先进陶瓷材料与器件重点实验室,包头014010 [3]轻稀土资源绿色提取与高效利用教育部重点实验室,包头014010

出　　处：《硅酸盐通报》2023年第5期1864-1874,共11页Bulletin of the Chinese Ceramic Society

基　　金：国家重点研发计划(2020YFC1909105);中国博士后科学基金(2022MD713770);内蒙古自然科学基金(2022LHMS05008)。

摘　　要：以粉煤灰、铁尾矿为主要原料,采用高温烧结活化-水热合成工艺制备了新型沸石化陶粒。利用高温烧结得到烧结陶粒的同时对原料中的莫来石等惰性相产生活化作用,后续采用水热反应对基础陶粒进行沸石化改性,增加其比表面积及吸附能力。研究表明最佳的制备工艺条件为:m(粉煤灰)∶m(铁尾矿)∶m(石英砂)=7∶1∶2,烧结温度1040℃,烧结时间30 min,NaOH溶液浓度1.5 mol/L,水热温度160℃,水热时间12 h。XRD、SEM、FT-IR和Raman结果表明,制备的沸石化陶粒的主晶相为P型沸石和方沸石,其比表面积从基础陶粒的1.068 m^(2)/g增加至35.770 m^(2)/g,同时,对NH_(4)^(+)-N离子的最大吸附容量由基础陶粒的1.82 mg/g增加至13.34 mg/g,分别增加至基础陶粒的33.49倍和7.33倍,结果表明沸石化陶粒在废水处理中具有潜在的应用前景。Fly ash and iron tailings were used as main raw materials,and a novel zeolitization ceramsite was successfully prepared by high temperature sintering activation-hydrothermal synthesis process.Basic ceramsite was obtained by high temperature sintering while activating inert phases such as mullite in the raw materials,then the zeolite modification of the basic ceramsite by hydrothermal reaction was carried out to increase the specific surface area and adsorption capacity of ammonia nitrogen.The results show that the optimum preparation conditions are as follows:m(fly ash)∶m(iron tailings)∶m(quartz sand)=7∶1∶2,sintering temperature is 1040℃,sintering time is 30 min,NaOH solution concentration is 1.5 mol/L,hydrothermal temperature is 160℃,hydrothermal time is 12 h.XRD,SEM,FT-IR and Raman tests show that the main crystal phase of the zeolitization ceramsite is zeolite P and analcime.And its specific surface area increases from 1.068 m^(2)/g of the basic ceramsite to 35.770 m^(2)/g,and the maximum adsorption capacity for NH_(4)^(+)-N increases from 1.82 mg/g of the basic ceramsite to 13.34 mg/g,which increase to 33.49 times and 7.33 times of the basic ceramsite,respectively.The present results of this experiment show that zeolitization ceramsite has potential applications in wastewater treatment.

关 键 词：粉煤灰 铁尾矿 沸石 陶粒 吸附 废水处理 

分 类 号：TQ536.4[化学工程—煤化学工程]