煤矸石催化气化耦合气化灰提铝过程中K2CO3和Na2CO3作用的对比研究  

Comparative study of K 2CO3 and Na 2CO3 in the process of coal gangue catalytic gasification coupled with aluminum extraction from gasification ash

作　　者：苗恒洋 王志青[1] 李翔宇 梅艳钢 刘哲语[1] 宋双双[1] 董立波[1] 黄戒介[1] 房倚天[1] MIAO Heng-yang;WANG Zhi-qing;LI Xiang-yu;MEI Yan-gang;LIU Zhe-yu;SONG Shuang-shuang;DONG Li-bo;HUANG Jie-jie;FANG Yi-tian(State Key Laboratory of Coal Conversion,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001,China;University of Chinese Academy of Sciences,Beijing 100049,China;Taiyuan Institute of Technology,Taiyuan 030008,China)

机构地区：[1]中国科学院山西煤炭化学研究所煤转化国家重点实验室,山西太原030001 [2]中国科学院大学,北京100049 [3]太原工业学院,山西太原030008

出　　处：《燃料化学学报》2020年第9期1063-1070,I0003,共9页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金(21506242)资助。

摘　　要：以煤矸石为研究对象,对比研究了Na2CO3与K2CO3对煤矸石催化气化反应性及催化气化灰中Al的溶出行为的影响。同时,采用X射线衍射分析(XRD)和热重分析(TGA)研究了不同催化剂及温度作用下矸石中矿物质的热转变过程。结果表明,与K2CO3相比,煤矸石中的高岭石更容易与Na2CO3反应生成钠霞石,而酸浸可实现钠霞石中铝和硅元素的有效分离。此外,Na2CO3作为催化剂时,所得气化灰经盐酸浸取后铝的浸出率可达到94.2%。而K2CO3作催化剂时,其铝的浸出率只有83.7%。因此,对矸石催化气化耦合气化灰的铝提取来说,Na2CO3催化剂具有更好的选择性。Coal gangue as the research object of this study,the effects of Na 2CO 3 and K 2CO 3 on the gasification reactivity and the dissolution behavior of Al from catalytic gasification were compared.At the same time,X-ray diffraction(XRD)and thermogravimetric analysis(TGA)were used to analyze the thermal-conversion process of mineral in coal gangue with different catalysts and at different temperatures.The results show that compared with K 2CO 3,Na 2CO 3 can react more easily with the kaolinite in coal gangue to form nepheline,which can achieve effective separation of aluminum and silicon by acid leaching.Moreover,using Na 2CO 3 as catalyst,the Al extraction rate of gasification ash treated by hydrochloric acid can reach 92.3%,while it can only reach 83.7%using K 2CO 3 as catalyst.Therefore,Na 2CO 3 has better selectivity for the coal gangue catalytic gasification coupled with aluminum extraction from gasification ash.

关 键 词：铝的浸出率 NA2CO3 K2CO3 矿物质转变 

分 类 号：TQ511[化学工程]