Abstract:

To determine the temperature range of iron ore reduction, the mixture of Datong bituminite and iron ore powder was reduced, and this process was measured by non-isothermal thermogravimetry.Gas product was analyzed by Fourier transform infrared spectroscopy(TG-FTIR) and solid one by X-ray diffraction(XRD）.The conversion, reduction fraction of iron ore and phase composition of solid product were calculated quantitatively for each stage.For comparison, the reduction behavior of the iron ore with Datong bituminite, Shenmu lignite or Yangquan anthracite was further studied by the non-isothermal TG technique.The results showed that the mixture of the iron ore and the Datong bituminite exhibited better redox response at relatively low temperatures(800—950℃) than the other two mixtures.At higher temperatures(1000—1100℃), the sample of the iron ore and Shenmu lignite also showed good reducibility.

Key words: FONT-SIZE: 10.5pt, mso-bidi-font-size: 11.0pt, mso-bidi-font-family: 宋体, mso-font-kerning: 1.0pt, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, mso-ascii-font-family: Calibri">铁矿石粉hansi-font-family: 宋体" lang=EN-US>;FONT-SIZE: 10.5pt, mso-bidi-font-size: 11.0pt, mso-bidi-font-family: 宋体, mso-font-kerning: 1.0pt, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, mso-ascii-font-family: Calibri">直接还原hansi-font-family: 宋体" lang=EN-US>;FONT-SIZE: 10.5pt, mso-bidi-font-size: 11.0pt, mso-bidi-font-family: 宋体, mso-font-kerning: 1.0pt, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, mso-ascii-font-family: Calibri">煤

摘要：

对大同烟煤-铁矿石粉的混合物进行了非等温热重-红外联用实验与分析，确定了铁矿石粉发生还原反应的温度区间范围，并结合还原产物的XRD图谱以及热重的定量计算结果，揭示了每个还原阶段完成后产物的物相及相应的还原分数。为了比较，进一步用热重分析仪对大同烟煤、神木褐煤以及阳泉无烟煤与铁矿石粉的混合物进行了非等温失重特性的对比实验研究。结果表明，低温阶段（800～950℃）大同烟煤对铁矿石粉的还原性最好，而高温阶段（1000～1100℃）神木褐煤也表现出良好的还原性。

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