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中文摘要：
利用高温沉降炉在不同燃烧温度下燃烧取得燃煤飞灰样品并通过振动样品磁强计测试其磁特性,再用穆斯堡尔谱仪定性和定量分析样品中的铁化合物,研究燃煤飞灰磁特性与其磁性当量铁相对含量及燃烧温度的关系。实验分析结果表明：煤粉燃烧后,煤中的含铁矿物质基本转化为含铁硅酸盐玻璃体以及α-Fe2O3、γ-Fe2O3和Fe3O4等铁氧化物存在于燃煤飞灰中,其中γ-Fe2O3和Fe3O4是铁磁性物质。燃煤飞灰饱和磁化强度与其中的磁性当量铁相对含量存在明显的正相关性。随着温度的上升,燃煤飞灰饱和磁化强度在保证煤粒充分燃烧温度范围内有逐渐降低的趋势。
英文摘要：
Coal-fired fly ash samples were collected through the experiments of burning pulverized coals in a high-temperature drop tube furnace at different temperature.Vibrating sample magnetometer（VSM） was employed to analyze magnetic characteristics of the samples.Mssbauer spectroscopy was employed qualitatively and quantitatively to analyze iron-bearing components in coal-fired fly ash.Systematic studies were carried out on the effects of equivalent magnetic iron oxide content and combustion temperature on magnetic characteristics of coal-fired fly ash.Experimental results show that the iron-bearing components in fly ash exist with the main composition of iron-bearing glass silicates,α-Fe2O3,γ-Fe2O3 and Fe3O4,among which γ-Fe2O3 and Fe3O4 are ferromagnetic substances.The positive correlation between equivalent magnetic iron oxide content and saturation magnetization of coal-fired fly ash is significant.Saturation magnetization of coal-fired fly ash decreases with increasing temperature in the temperature range in which complete burning of coal can take place.
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