【摘要】 采用自制热解装置对北宿煤进行热解,此装置与传统热解装置相比具有处理量大和操作简便等优势,能够与磁选实验相结合,热解温度400℃～700℃,氮气流量0.1L/min,保温时间为30min,主要研究热解温度对煤粉磁选脱硫效果的影响.结果表明:适当提高热解温度对磁选脱硫是十分有利的,且500℃时效果最佳,热解后半焦与原煤相比磁选脱硫率提高近40%;利用XRD分别对原煤、500℃半焦及半焦磁选后的精煤进行分析,发现半焦中有强磁性矿物磁黄铁矿(Fe1-xS)生成,精煤中已无黄铁矿,说明热解-磁选脱硫技术能够有效脱除煤中无机硫.依据GB/T215-2003分析试样中硫的形态,发现煤中有机硫含量高且以噻吩硫形式存在,给实现北宿煤低温预处理磁选高效脱硫造成了困难.更多还原

【Abstract】 Beisu coal was pyrolyzed in a pyrolysis device,which was studied the desulfurization effect of magnetic separation under different pyrolysis temperatures at 400 ℃-700 ℃.The nitrogen flow was 0.1 L/min and the holding time was 30 min.Compared with the traditional pyrolysis devices,it has many advantages,such as large capacity,easy operation and can combine with the magnetic separation experiments.The experiment results showed that appropriately increasement of pyrolysis temperatures were favorable for the magnetic desulfurization rate and especially pyrite sulfur was reduced well at 500 ℃,compared untreated sample to raise nearly 40%.According to XRD analysis of the raw coal,500 ℃ semi-coke,the refined coal and the tailing coal after semi-coke magnetic separation respectively,it can find strong magnetic mineral pyrrhotite(Fe1-xS)in semi-coke,and no pyrite in refined coal.It demonstrates that pyrolysis-magnetic separation can remove the inorganic sulfur in coal.According to Chinese standards(GB/T215-2003),it found that organic sulfur existed considerably in the form of thiophene,so it is diffcult to improve Beisu coal magnetic desulfurization rate by low-temperature pyrolysis.更多还原