配煤和助熔剂降低煤灰熔融温度的矿物学特性研究

徐荣声; 王永刚; 林雄超; 杨萨莎; 艾沙江; 杨远平

配煤和助熔剂降低煤灰熔融温度的矿物学特性研究

中国矿业大学(北京)化学与环境工程学院, 北京 100083

基金项目: 国家自然科学基金(21406261),"十二五冶国家科技支撑计划重点项目(2012BAA04B02)资助

详细信息

通讯作者:
王永刚,Tel:010-62339882,E-mail:wyg1960@126.com

中图分类号: TQ545
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出版历程
- 收稿日期: 2015-04-30
- 修回日期: 2015-06-30
- 刊出日期: 2015-11-30

Mineralogical properties of lowering coal ash melting temperature using blending coal and fluxing agent

School of Chemical and Environmental Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China

Funds: The project was supported by the National Natural Science Foundation of China (21406261) and the Key Projects in the National Science & Technology Pillar Program during the Twelfth Five-year Plan Period (2012BAA04B02).

摘要

摘要: 主要研究添加助熔剂或配煤降低晋城无烟煤的灰熔融温度。通过X射线衍射(XRD)、热力学计算以及灰熔点测试等手段,研究混煤灰熔融特性及其在变形温度时的矿物学特征,解析其结渣特点。结果表明,原煤灰含量越低,混煤灰熔点降低效果越明显。在配煤添加量为20%时,低灰煤C灰熔点降低趋势最明显,对于高灰煤G,则为30%;助熔剂K对C的灰熔点降低效果比对G的更明显。在混煤灰的变形温度处,出现了长石类矿物质。长石类矿物含量的上升和莫来石含量的下降促使灰熔点快速降低。热力学计算表明,高温下,煤灰中液相物质的产生伴随着钙长石和石英含量的快速下降以及莫来石含量的缓慢降低。钙长石参与了煤灰中液相物质的产生。能够与钙长石作用形成低熔点共熔体的物质的含量决定了它的助熔效果。
- 混煤 /
- 变形温度 /
- 矿物学特性 /
- 化学组成
Abstract: In order to understand the slagging properties of blended coal, different coal blending and flux agent were added to Jincheng anthracites. The X-ray diffraction (XRD), thermodynamic software FactSage and ash fusion temperature (AFT) test were employed to analyze the ash fusion characteristics of blended coals and the mineralogical properties of the blended coal ashes. The results show that the content of ash in coal has an important role in the AFT change of blended coals. The lower the ash contained in raw coal is, the easier the AFT of blended coal lowers. The addition ratio of coal blending is 20% and 30% when the AFT decreases significantly for coal C with low ash content and G with high ash content, respectively. There is more significant fluxing effect of K on C than that on G. It is found that the feldspar mineral is formed at the deformation temperature. The decreasing in contents of mullite as well as the appreciably increasing for feldspar is the main reason for the decreasing of AFT. The thermodynamic analyses indicate that the producing of liquid matter is related to the rapidly decreasing in the contents of anorthite and quartz, as well as slowly decreasing for mullite at high temperature. The anorthite takes part in the formation of liquid matter. The fluxing effect of anorthite depends on the contents of matter which can react with anorthite to produce a melt with lower fusion point.
- blended coal /
- deformation temperature /
- mineralogical property /
- chemical composition

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