Synthesis and Properties of Red Mud-Based Nanoferrite Clinker
Synthesis and Properties of Red Mud-Based Nanoferrite Clinker
复制标题
赤泥基纳米铁氧体熟料的合成及性能
DOI：
10.1155/2019/3617050
复制
发表时间：
2019-07
影响因子：
--
通讯作者：
Feng Xing
中科院分区：
文献类型：
--
作者：
Hongfang Sun;Chuyu Chen;Li Ling;Shazim Ali Memon;Zhu Ding;Weiwen Li;Lu-ping Tang;Feng Xing
赤泥是氧化铝厂产生的工业废物，通常排入海洋或填埋，污染周围的水、大气和土壤。因此，赤泥的处置是一个环境问题，应该以有效的方式回收利用。由于红泥由富含铁和铝的相组成，因此它可以被加工成水泥材料，并可用于建筑目的。以赤泥为原料，采用化学燃烧法制备纳米铁氧体熟料，研究其在水泥基复合材料中的应用。在制备纳米纤维素之前，采用X射线荧光光谱、X射线衍射和扫描电镜等技术对赤泥进行了表征。根据表征结果，计算并实验优化了原料的化学计量比。然后在各种温度（815、900、1000和1100°C）下测试样品以找到最佳合成温度。最后，NF的水硬性活性进行了验证，并确定了机械性能的贡献，取代水泥与NF在不同的取代水平（0，5，10，和20重量%）。实验结果表明，当CaCO 3/赤泥为1.5，烧成温度为815°C时，制备NF的最佳工艺条件为：CaCO 3/赤泥= 1.5，烧成温度为815°C。所合成的纳米纤维平均粒径为300 nm，主要成分为水硬性的碳镁矾（C4 AF）。当NF取代波特兰水泥用于砂浆中时，当其取代量为5%时，抗折强度提高了15%。因此，可以得出结论，NF的合成提供了一种替代的途径来回收赤泥，可以显着地帮助减少环境污染。
Red mud, an industrial waste obtained from alumina plants, is usually discharged into marine or disposed into a landfill polluting the surrounding water, atmosphere, and soil. Thus, disposal of red mud is an environmental concern and it should be recycled in an effective way. Since red mud consists of iron- and aluminum-rich phases, it can potentially be processed into cementitious material and can be used for a construction purpose. This research investigated the synthesis of nanoferrite (NF) clinker by using red mud as a raw material through chemical combustion technology for potential use in cement-based composite. Before the synthesis of NF, red mud was characterized by using XRF, XRD, and SEM techniques. From characterization results, the stoichiometric ratio of raw materials was calculated and experimentally optimized. The sample was then tested at various temperatures (815, 900, 1000, and 1100°C) to find the optimum synthesis temperature. Finally, the hydraulic activity of NF was verified and the contribution to mechanical properties was determined by replacing cement with NF at various substitution levels (0, 5, 10, and 20 wt%). Test results showed that the optimum condition for the synthesis of NF was found when the ratio of CaCO3/red mud was 1.5 and the sintering temperature was 815°C. The synthesized NF had an average diameter of 300 nm, and the main composition was brownmillerite (C4AF) with distinct hydraulic reaction. When NF was used as a substitute of Portland cement in mortar, the flexural strength with a 5% replacement level improved by 15%. Therefore, it can be concluded that the synthesis of NF provides an alternative approach to recycle red mud and could significantly help in reducing environmental pollution.
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影响因子：
8.1
作者：
Maneesh Singh;S. Upadhayay;P. Prasad
通讯作者：
Maneesh Singh;S. Upadhayay;P. Prasad
影响因子：
3
作者：
S. Ananthakumar;G. Krishnapriya;A. D. Damodaran;K. Warrier
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影响因子：
7.4
作者：
Tang, W. C.;Wang, Z.;Cui, H. Z.
通讯作者：
Cui, H. Z.
影响因子：
3.5
作者：
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通讯作者：
J. Felsche;S. Luger
影响因子：
22.1
作者：
S. Sushil;V. Batra
通讯作者：
S. Sushil;V. Batra