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准东煤中碱金属的赋存形态及其在热解过程中的迁移规律

DOI: 10.13334/j.0258-8013.pcsee.2014.S.018, PP. 130-135

Keywords: 准东煤,碱金属,赋存,热解,迁移

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Abstract:

采用三步化学萃取的方法,研究准东煤中碱金属的赋存形态。将煤样置于惰性气体氛围的管式炉中,研究热解条件下,碱金属随温度在400~1000℃变化的迁移规律。最后用FactSage软件模拟了热解过程中准东煤煤灰中碱金属的析出形式。结果表明,准东煤中钠主要以水溶钠的形式存在,而钾则以有机钾和不溶钾为主。准东煤中水溶钠的含量在热解过程中下降明显,并且在温度为400~800℃时释放速率最快,而热解过程中水溶钾的含量则相对比较稳定,高温下,钾钠之间会发生置换反应。实验和FactSage模拟结果均表明,热解过程中,准东煤中的碱金属主要以氯化物的形式释放。

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