Comparative study of K2CO3 and Na2CO3 in the process of coal gangue catalytic gasification coupled with aluminum extraction from gasification ash
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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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Key words:
- aluminum leaching rate /
- Na2CO3 /
- K2CO3 /
- minerals transformation
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图 3 两种催化剂在不同温度下对气化反应性能的影响
Figure 3 Effects of two catalysts on gasification reactivity at different temperatures
■: K2CO3; ●: Na2CO3
图 4 不同温度下气化反应指数的变化
Figure 4 Changes of gasification reaction index at different temperatures
图 6 CGA-K催化气化灰的XRD谱图
Figure 6 XRD patterns of CGA-K catalytic gasification ash
A: kalsilite (KAlSiO4); B: quarz (SiO2)
图 7 CGA-Na催化剂的XRD谱图
Figure 7 XRD patterns of CG-Na
A: nepheline(Na7.11(Al7.2Si8.88O32)); B: sodium aluminum silicate (NaAlSiO4); C: nepheline(Si-rich)(Na6.8(Al6.3Si9.7O32)); D: nepheline(Na-exchanged)(Na6.65Al6.24Si9.76O32)
图 9 1000 ℃下酸溶灰的XRD谱图
Figure 9 XRD patterns of acid-dissolved ash at 1000℃
A: quarz (SiO2); B: kalsilite (KAlSiO4)
图 10 1000 ℃下气化灰和酸溶灰的SEM照片
Figure 10 SEM images of gasification ash and acid soluble ash at 1000℃
(a): GA-K; (b): Cl-CGA-K; (c): CGA-Na; (d): HCl-CGA-Na
表 1 原煤矸石的工业分析和元素分析
Table 1 Proximate and ultimate analyses of coal gangue sample
Proximate analysis wad/% Ultimate analysis wdaf/% M A V FC C H Oa N S 0.93 65.00 17.07 17.00 62.46 6.23 30.14 0.88 0.29 a: by difference 
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表 2 灰成分分析
Table 2 Ash compositions of coal gangue sample
Sample Content w/% SiO2 Al2O3 Fe2O3 CaO MgO P2O5 TiO2 K2O Na2O Cl2O XCG 52.51 44.96 0.32 0.20 0.21 0.42 1.02 0.13 0.00 0.23 CGA-Na 47.01 33.42 0.63 0.13 0.12 0.03 0.81 0.21 17.54 0.10 CGA-K 39.11 32.19 0.66 0.15 0.08 0.37 0.92 26.4 0.00 0.12
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表 3 800 ℃下气化灰和酸溶灰的能谱分析
Table 3 EDS analysis results of gasification ash and acid soluble ash at 800 ℃
Sample EDS analysis results w/% Si Al O K Na CGA-K 9.54 8.99 70.24 11.24 0.00 HCl-CGA-K 13.37 3.89 82.74 0.00 0.00 CGA-Na 9.47 7.39 73.06 0.00 10.08 HCl-CGA-Na 34.79 0.00 65.21 0.00 0.00
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