不同灰化温度下准东煤碱/碱土金属的析出特性

摘要

实验考察了不同灰化温度下3种不同矿区的准东煤碱/碱土金属的析出特性。结果表明，随灰化温度升高，灰分含量减少，减少程度与煤灰成分有关；不同矿区准东煤灰中碱金属、碱土金属以及氯元素含量差别较大；灰化温度对碱金属 Na、K 元素析出的影响因煤样矿区不同而迥异，与碱金属的赋存形式有关；实验温度范围内(500～815,℃)，碱土金属Ca、Mg元素的析出基本不受灰化温度的影响；煤灰中氯元素对碱金属的释放特性有影响。%The release of alkali and alkaine earth metal(AAEM)species in three types of Zhundong coal was experi-mentally studied. It is found that measured ash contents decrese as ashing temperature increases. The effect of tem-perature on the amount of measured ash content depends on ash components. The content and type of AAEM sepeices are different for the coal from different mines. The effect of ashing temperature on therelease of alkali metal species greatly relies on the mineral forms,while ashing temperature has little effect on the release of alkaline earth metal species. Chlorine has an important effect on the release of alkali metal species.