低温热处理对神府煤成浆性影响的机理研究

摘要

The low temperature thermal treatment method was used to modify Shenfu coal. The effect of low temperature thermal treated Shenfu coals were characterized by FT-IR test,BET test and contact angle experiments to investigate the effect of low temperature thermal treatment on the structure and hy-drophobicity of Shenfu coal,and the mechanism for improving the slurrying ability of Shenfu coal by thermal treatment was further discussed. The results suggest that thermal treatment can reduce the polar functional groups of carboxyl and hydroxyl,decrease the specific surface area and increase the average pore size,resulting in the increase of coal surface hydrophobicity. The thermal treatment can improve the slurrying ability of Shenfu coal,The optimized thermal treatment temperature is between 350 ℃ and 400℃. Meanwhile,treatment time under certain temperature also affect the slurry viscosity and syneresis rate of Shenfu coal. The effect of treatment time on the slurry viscosity is more significant than that on the syneresis rate at the low temperature. But the effect reverses at the high temperature. The low tempera-ture thermal treatment method not only can improve the slurrying ability of Shenfu coals,but also pro-duce ~3% tars.%采用低温热处理方法对神府煤进行了改性,通过FT-IR、BET、接触角测定等研究了低温热处理对神府煤的结构与表面疏水性的影响,并进一步探讨了热处理对神府煤成浆性的影响机理.结果表明:神府煤经过热处理后,其表面羧基和羟基等极性官能团减少,煤粒表面亲水性降低,比表面积减小,平均孔径增大;热处理温度在350 ℃ ~400 ℃时,煤的成浆粘度较低;热处理时间对热处理后煤粉的浆体粘度和析水率有一定的影响,热处理温度较低时,热处理时间对浆体粘度有显著影响,对析水率影响较小,热处理温度较高时,热处理时间对浆体粘度影响较小,但是对析水率影响较大;用低温热处理方法,不仅可改善神府煤的成浆性,同时,可获得3%左右的焦油.