二次铝灰制备微晶玻璃及性能研究
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摘要
以二次铝灰为主要原料,通过熔融法,经500℃退火、780℃核化以及880℃晶化热处理后制备得到了以钙长石、硅灰石和透辉石为晶相的CaO-MgO-Al_2O_3-SiO_2(CMAS)系灰渣微晶玻璃。采用XRD、DTA、SEM、物化性能测试等研究了铝灰含量对微晶玻璃析晶行为、显微形貌和性能的影响规律。结果表明:铝灰含量为30%的时候微晶玻璃的主晶相为硅灰石,随着铝灰含量的逐渐增加,主晶相变为钙长石。当铝灰含量达到55%的时候,XRD图谱中出现了透辉石的衍射峰。微晶玻璃硬度随着铝灰含量的增加不断增大,密度先降低后增大,耐酸腐蚀性能逐渐降低,耐碱腐蚀性能逐渐增强。
Glass-ceramics in the CaO-MgO-Al_2O_3-SiO_2 (CMAS) quaternary system were prepared by the method of melting based on the secondary aluminum dross. After the heat treatment process including annealing (500 ℃),nucleation (780 ℃) and crystallization (880 ℃),the crystalline phases of anorthite,wollastonite and diopside were observed in the samples with different contents of the secondary aluminum dross. The effect of aluminum dross on the crystallization behavior, microstructure and performance of the glass-ceramics were investigated by means of XRD,DTA,SEM,the physical and chemical properties were also tested. The results indicate that the main crystalline phase of glass-ceramics with 30% aluminum dross is wollastonite and then transform into anorthite with increase of aluminum dross content. As aluminum dross content increased to 55%,weak diffraction patterns of diopside would be detected. The hardness of glass-ceramics increases as the aluminum dross is increasing. The density of glass-ceramics decreases firstly and then increases afterwards,and acid resistance decreases while alkali resistance increases gradually.
Glass-ceramics in the CaO-MgO-Al_2O_3-SiO_2 (CMAS) quaternary system were prepared by the method of melting based on the secondary aluminum dross. After the heat treatment process including annealing (500 ℃),nucleation (780 ℃) and crystallization (880 ℃),the crystalline phases of anorthite,wollastonite and diopside were observed in the samples with different contents of the secondary aluminum dross. The effect of aluminum dross on the crystallization behavior, microstructure and performance of the glass-ceramics were investigated by means of XRD,DTA,SEM,the physical and chemical properties were also tested. The results indicate that the main crystalline phase of glass-ceramics with 30% aluminum dross is wollastonite and then transform into anorthite with increase of aluminum dross content. As aluminum dross content increased to 55%,weak diffraction patterns of diopside would be detected. The hardness of glass-ceramics increases as the aluminum dross is increasing. The density of glass-ceramics decreases firstly and then increases afterwards,and acid resistance decreases while alkali resistance increases gradually.
引文
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[2]Hong J,Wang J.Process of aluminum dross recycling and life cycle assessment for Al-Si alloys and brown fused alumina[J].Transactions of Nonferrous Metal Society of China,2010(11):2155-2161.
[3]Shen H,Forssberg E.An overview of recovery of metals from slags[J].Waste Management,2003(23):933-949.
[4]Das B R,Dash B,Tripathy B C,et al.Production ofη-alumina from waste aluminium dross[J].Minerals Engineering,2007,20(3):252-258.
[5]Nogueira F G E,Asencios Y J O,Rodella C B,et al.Alternative route for the synthesis of high surface-areaη-Al2O3/Nb2O5catalyst from aluminum waste[J].Materials Chemistry and Physics,2016,184:23-30.
[6]刘瑞琼,智利彪,智国彪.利用铝灰低温冶炼制备棕刚玉[J].耐火材料,2014,48(2):145-146.
[7]张雷,赵雅芝,全燮,等.用废铝渣制备聚合硫酸铝[J].化工环保,2005,25(5):382-385.
[8]徐晓虹,熊碧玲,吴建锋,等.废铝灰制备陶瓷清水砖的研究[J].武汉理工大学学报,2006,28(5):14-16.
[9]秦娟,崔崇,崔晓昱,等.钙长石晶体的形成机制研究[J].人工晶体学报,2016,45(5):1153-1157.
[10]杨广跃.透辉石基Ca O-Mg O-Al2O3-Si O2微晶玻璃析晶和性能研究[D].杭州:浙江大学,2012.
[11]董全,张文军.硅灰石的特性与开发应用[J].辽宁工程技术大学学报,2004,24:33-35.
[12]Erola M,Demirler U,Kücükbayraka S,et al.Characterization investigations of glass-ceramics developed from deyitōmer thermal power plant fly ash[J].Journal of the European Ceramic Society,2003(23):757-763.
[13]Peng F,Liang K M,Hu A M.Nano-crystal glass-ceramics obtained from high alumina coal fly ash[J].Fuel,2005(84):341-346.
[14]李保卫,邓磊波,张雪峰,等.热处理温度对矿渣微晶玻璃显微结构及耐腐蚀性的影响研究[J].中国陶瓷,2012,48(5):56-58.
[15]赵彦钊,殷海荣.玻璃工艺学[M].北京:化学工业出版社,2006,4:103-104.
[16]周琦,王枫成,南雪丽,等.碱金属氧化物对镍渣微晶玻璃性能的影响[J].兰州理工大学学报,2010,36(6):17-20.