煤气化渣基氨氮吸附剂的制备及吸附性能研究  

Research on preparation and adsorption properties of ammonia nitrogen sorbent based on coal gasification slag

作　　者：马超[1,2] 王兵 樊盼盼[1,2] 严晓辉[3] 鲍卫仁 常丽萍 王建成[1,2] MA Chao;WANG Bing;FAN Panpan;YAN Xiaohui;BAO Weiren;CHANG Liping;WANG Jiancheng(State Key Laboratory of Clean and Efficient Coal Utilization,Taiyuan University of Technology,Taiyuan 030024,China;Key Laboratory of Coal Science and Technology,Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China;China Energy Investment Group Co.,Ltd.,Beijing 100010,China)

机构地区：[1]太原理工大学省部共建煤基能源清洁高效利用国家重点实验室,山西太原030024 [2]太原理工大学煤科学与技术教育部重点实验室,山西太原030024 [3]国家能源投资集团有限责任公司,北京100010

出　　处：《洁净煤技术》2021年第3期109-115,共7页Clean Coal Technology

基　　金：国家重点研发计划资助项目(2019YFC1904300);国家能源集团宁夏煤业有限公司气化炉滤饼高效分选富碳及资源化利用项目(RH2000003244)。

摘　　要：水中氨氮含量过高,会导致“水华”、“赤潮”等现象,破坏生态平衡。为了实现对工业和生活废水中氨氮的高效去除,以煤气化过程中产生的大宗煤气化渣经过水介旋流器分选后,得到富碳细渣(RCS)产物为原料,制备了煤气化基氨氮吸附剂,并对其氨氮吸附性能进行研究。物理吸附结果显示,吸附剂比表面积为311 m^(2)/g。通过X射线衍射(XRD)、扫描电子显微镜(SEM)、傅里叶变换红外吸收(FT-IR)光谱等对吸附剂进行结构表征。RCS水热后生成了较为规整的A型沸石和SAPO-20型分子筛杂晶。氨氮吸附试验表明,在固液比为10 g/L、溶液初始pH=6.8、氨氮初始浓度为60.0 mg/L、接触时间为1 min时,吸附剂对氨氮的平衡吸附量为3.5 mg/g,去除率达51.0%。但同等条件下RCS对氨氮的去除率仅为8.1%。吸附剂对氨氮吸附等温线符合Freundlich方程,吸附剂吸附氨氮行为符合准一级动力学方程。The high content of ammonia nitrogen in water will lead to“bloom”,“red tide”and other phenomena,destroy the ecological balance.In order to realize the efficient removal of ammonia nitrogen from industrial and domestic wastewater,the coal gasification based ammonia nitrogen adsorbent was prepared by using the product of rich carbon slag(RCS)from the bulk coal gasification slag separated by a water-medium cyclone,and its ammonia nitrogen adsorption performance was studied.The physical adsorption results show that the specific surface area of the adsorbent is 311 m^(2)/g.The structure of the adsorbent was characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM)and Fourier transform infrared absorption(FT-IR)spectroscopy.Relatively regular zeolite A and SAPO-20 molecular sieve heterocrystals were formed After the RCS hydrothermal treatment.Ammonia nitrogen adsorption experiments show that when the adsorbent solid-liquid ratio is 10 g/L,the initial pH value of the solution is 6.8,the initial ammonia concentration is 60.0 mg/L,and the contact time is 1 min,the equilibrium adsorption capacity of the adsorbent for ammonia nitrogen is 3.5 mg/g,and the removal rate reaches 51.0%.However,under the same conditions,the removal rate of ammonia nitrogen by RCS is only 8.1%.The adsorption isotherm of ammonia nitrogen by adsorbents conforms to Freundlich equation,and the adsorption behavior of ammonia nitrogen by adsorbents conforms to the quasi-first-order kinetic equation.

关 键 词：煤气化渣 富碳细渣 水热合成 氨氮 吸附剂 沸石 

分 类 号：X784[环境科学与工程—环境工程] X703