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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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高温气化条件下煤直接液化残渣中矿物质演化行为的研究
, PP. 257-265
Keywords: 液化残渣,高温气化,矿物质演化,fe2+/fe3+
Abstract:
？利用xrd和ft-ir分析了高温(1100~1500℃)气化条件下液化残渣中矿物质的演变行为,并利用穆斯堡尔谱仪对残渣灰中的含铁相及铁的价态铁进行了定量分析。结果表明,煤直接液化残渣中的主要矿物质为石英、硫酸钙、紫铝铁矾、磁黄铁矿、高岭石和方解石。高温气化条件下残渣灰中主要矿物质为钙长石、钙黄长石、磁赤铁矿和磁铁矿。由于钙长石、钙黄长石等含钙化合物低温共熔作用,使得残渣灰具有较低的熔融温度。残渣灰中的含铁相主要为磁赤铁矿、磁铁矿、铁橄榄石和玻璃体,并且随温度的升高,玻璃体中的铁含量逐渐增加。同时,残渣灰中fe2+/fe3+出现先增加后降低再增加的变化趋势。当温度由1100℃升高至1200℃时,由于磁赤铁矿的还原,fe2+/fe3+由1.08升高至2.39;1200℃以上fe2+/fe3+的变化不明显。另外,玻璃体中铁含量的增加是引起残渣灰液相含量随温度升高而增加的重要原因,铁含量高是导致残渣灰熔融温度低的主要原因。
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