碳热还原粉煤灰物相变化规律

发布时间：2018-08-06 11:45

【摘要】：在感应炉中,空气气氛下,以粉煤灰为原料,木炭为还原剂,不同温度条件下对粉煤灰还原反应过程及合金进行研究。利用XRD,SEM-EDS技术对还原产物进行分析检测。结果表明,碳还原粉煤灰分为4个阶段:(1 373~1 673 K)Fe2O3和碳反应生成铁;(1 773~1 873 K)石英和碳反应生成Si C,莫来石发生分解并与碳反应生成Si C和Al2O3;(1 973~2 173 K)石英除生成较多Si C,还有少量Si生成,部分Al2O3和空气中的氮气生成Al5O6N,并最终分解成Al2O3和Al N;2 273 K氧化铝和Si C,C反应生成Al,Si,Al N和碳反应生成Al。高温下有气态的Si O,Al2O产生,造成部分铝硅损失。合金由3个相组成,3者相互混合存在,除含有较多Al,Si,Fe,Ca外,还含有部分Si C。在合适的配碳量下,Al2O3对Si C的生成有抑制作用。
[Abstract]:In induction furnace, the reduction reaction process and alloy of fly ash were studied under different temperature with fly ash as raw material and charcoal as reducing agent. The reduction products were analyzed and detected by XRDX SEM-EDS technique. The results show that Carbon reduction fly ash is divided into four stages: (1 373N 1 673K) Fe2O3 and carbon reaction to form iron, (1 773N 1 873 K) quartz reacts with carbon to form sic, mullite decomposes and reacts with carbon to form sic C and Al 2O 3, (1 973N 2 173K) quartz produces not only more sic, but also a little Si. Al5O6N was formed by partial Al2O3 and nitrogen gas in air, and then decomposed into Al2O3 and AlN2273K alumina and sic C to form AlN and carbon to form Al5O6N. At high temperature, gaseous Sio _ (2) O _ (2) O _ (2) O _ 2 O is produced, which results in partial loss of aluminum and silicon. The alloy consists of three phases, which are mixed with each other and contain not only more Al _ 2O _ Si _ Si _ (Fe) Ca, but also some sic _ (C). The formation of sic was inhibited by Al _ 2O _ 3 at suitable carbon content.
【作者单位】：昆明理工大学真空冶金国家工程实验室;省部共建复杂有色金属资源清洁利用国家重点实验室;昆明理工大学冶金与能源工程学院;
【基金】：昆明理工大学校级大学生创新创业训练计划资助项目(201410674262) 云南省科技领军人才培养计划资助项目(2014HA003) 国家自然科学基金地区基金资助项目(51264023)
【分类号】：TF821;X773

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