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北京地区细颗粒铁尾矿烧结过程与机理研究
Sintering Process and Mechanism of Fine Grained Iron Tailings from Beijing
投稿时间:2017-10-13  修订日期:2017-11-29
DOI:103969/j.issn.1007 9629201804024
中文关键词:  铁尾矿  组分  相变过程  烧结机理  微观分析
英文关键词:iron tailing  component  phase change  sintering mechanism  microstructure analysis
基金项目:国家自然科学基金资助项目(51472024)
              
作者单位
李润丰
LI Runfeng
北京交通大学机械与电子控制工程学院,北京100044
School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China
周洋
ZHOU Yang
北京交通大学机械与电子控制工程学院,北京100044
School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China
李世波
LI Shibo
北京交通大学机械与电子控制工程学院,北京100044
School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China
李翠伟
LI Cuiwei
北京交通大学机械与电子控制工程学院,北京100044
School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China
黄振莺
HUANG Zhenyin
北京交通大学机械与电子控制工程学院,北京100044
School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China
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中文摘要:
      针对北京密云地区目前难以利用的泥状细颗粒铁尾矿,采用多种分析手段对其化学成分、粒度、物相组成等进行了表征,并着重探究了密云铁尾矿在高温烧结过程中的物相变化及其机理.结果表明:密云铁尾矿中的SiO2含量(质量分数,下同)约为60%,且含有较多的黏土矿物相;加热过程中,铁尾矿坯体中黏土矿物绿泥石等在500~700℃时发生分解,在约900℃时有正长石、微斜长石和赤铁矿生成;963℃以上正长石、微斜长石与石英、铝硅酸盐形成低共熔物,进入液相烧结阶段;1000~1120℃时生成透辉石、普通辉石和钙长石,且其含量随温度升高而增加,同时伴随有赤铁矿相的增加和石英相的减少;随着烧结温度的提高,铁尾矿样品颜色逐渐加深,同时烧结收缩率、质量损失率、密度、维氏硬度均逐渐增大.该型铁尾矿适于用作建筑保温材料的原料.
英文摘要:
      The chemical composition, grain size and phase composition of fine particle tailing from Miyun district in Beijing were investigated by using a variety of analysis methods. Especially the phase change and its mechanism in sintering process were focused. The results show that tailing from Miyun includes 60%(by mass) SiO2 and clay mineral which decomposed at the range of 500℃ to 700℃. Orthoclase, microcline and hematite generates at about 900℃. However, the fact that orthoclase and microcline forms an eutectic compound with quartz, aluminosilicate above 963℃ means that the sample enters into the process of sintering. Augite, diopside and anorthite generates at the range of 1000℃ to 1120℃ and their content increases with increasing temperature, accompanied by increase of hematite phase and decrease of quartz phase. With sintering temperature increasing, samples colour deepens gradually, while sintering shrinkage rate, mass loss, density and Vickers hardness increase obviously at the same time. The tailings are suitable for use as raw materials for building thermal insulation materials.
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