Citation: WEN Hai-tao, KONG Ling-xue, BAI Jin, BAI Zong-qing, LÜ Dong-mei, LI Wen. Transformation of minerals in direct coal liquefaction residue under gasification atmosphere at high temperatures[J]. Journal of Fuel Chemistry and Technology, ;2015, 43(3): 257-265. shu

Transformation of minerals in direct coal liquefaction residue under gasification atmosphere at high temperatures

WEN Hai-tao ^1,2 ,
KONG Ling-xue ¹ ,
BAI Jin ^1,, ,
BAI Zong-qing ¹ ,
LÜ Dong-mei ^1,2 ,
LI Wen ¹

1.
1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;

Corresponding author: BAI Jin,
Received Date: 11 October 2014

Fund Project: 国家自然科学基金(21476247) (21476247) 国家自然科学基金青年基金(21406254) (21406254) 国家自然科学基金委员会与神华集团有限责任公司联合资助项目(U1261209)。 (U1261209)

The transformation behavior of mineral matters in direct coal liquefaction residue from Shenhua Corporation under gasification atmosphere at high temperatures was examined by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). Mssbauer spectroscopy was also applied to investigate the iron-bearing minerals and the valence distribution of iron in ash at different temperatures. The results show that the major minerals in coal liquefaction residue are quartz, calcium sulfate, millosevichite, pyrrhotite, kaolinite, and calcite. At high temperatures, they become anorthite, gehlenite, maghemite and magnetite. Due to the formation of anorthite, gehlenite eutectic, ash of coal liquefaction residue exhibits low fusion temperature. The iron-bearing minerals characterized in ash include maghemite, magnetite, fayalite, and the vitreous matter. The content of iron in vitreous matter increases with increasing temperature. Meanwhile, Fe²⁺/Fe³⁺ significantly increases from 1.08 to 2.39 as temperature increases from 1 100 to 1 200 ℃ for the reduction of maghemite, and it is not obviously changed above 1 200 ℃. Furthermore, the liquid phase in ash calculated by FactSage increases with temperature owing to the increase of iron in vitreous phase. In hence, high content of iron in ash from coal liquefaction residue is the major reason for its low ash fusion temperatures.
- direct coal liquefaction residue,
- gasification atmosphere,
- mineral transformation,
- Fe²⁺/Fe³⁺
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