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 K2CO3 and Na2CO3 in the process of coal gangue catalytic gasification coupled with aluminum extraction from gasification ash

    摘要
  • 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。

     

    Abstract: Coal gangue as the research object of this study, the effects of Na2CO3 and K2CO3 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 K2CO3, Na2CO3 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 Na2CO3 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 K2CO3 as catalyst. Therefore, Na2CO3 has better selectivity for the coal gangue catalytic gasification coupled with aluminum extraction from gasification ash.

     

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