| Na2O掺杂铝酸钙化合物物相转化与浸出性能 |
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| 引用本文： | 田勇攀,涂赣峰,潘晓林,于海燕. Na2O掺杂铝酸钙化合物物相转化与浸出性能[J]. 化工学报, 2015, 66(4): 1551-1556. DOI: 10.11949/j.issn.0438-1157.20141264 |
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| 作者姓名： | 田勇攀 涂赣峰 潘晓林 于海燕 |
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| 作者单位： | 东北大学材料与冶金学院, 辽宁 沈阳 110819 |
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| 基金项目： | 国家自然科学基金项目(51174054,51374065)~~ |
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| 摘 要： | 以分析纯试剂CaCO3、Al2O3和Na2CO3为原料,在1350℃烧结1 h合成了Na2O掺杂铝酸钙熟料,并采用XRD、SEM和EDS等方法研究了Na2O掺杂CaO-Al2O3体系铝酸钙化合物的物相演变规律及熟料浸出性能。结果表明:当CaO和Al2O3的摩尔比为1.0时,CaO-Al2O3体系铝酸钙由CaO·Al2O3和12CaO·7Al2O3组成,而Na2O掺杂铝酸钙熟料由CaO·Al2O3、12CaO·7Al2O3、Na2O·Al2O3和Na4Ca3(AlO2)10组成。除形成含Na2O化合物外,熟料中掺杂的Na2O固溶于12CaO·7Al2O3中,而CaO·Al2O3中几乎不含Na2O。随着熟料中Na2O掺杂量的升高,12CaO·7Al2O3和Na4Ca3(AlO2)10的含量逐渐增加,CaO·Al2O3的含量逐渐降低;12CaO·7Al2O3和Na4Ca3(AlO2)10的结晶度逐渐降低,CaO·Al2O3的结晶度逐渐升高。Na2O的掺杂提高了熟料在碳酸钠溶液中的浸出性能,并且使浸出渣中CaCO3的空间群由R-3CH、P63/MMC两种转变为只含有R-3CH一种。
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| 关 键 词： | Na2O掺杂 烧结 铝酸钙 浸取 物相转化 |
| 收稿时间： | 2014-08-20 |
| 修稿时间： | 2015-01-04 |
Phase transformation and leaching performance of Na2O-doping calcium aluminate compounds |
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| TIAN Yongpan;TU Ganfeng;PAN Xiaolin;YU Haiyan. Phase transformation and leaching performance of Na2O-doping calcium aluminate compounds[J]. Journal of Chemical Industry and Engineering(China), 2015, 66(4): 1551-1556. DOI: 10.11949/j.issn.0438-1157.20141264 |
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| Authors: | TIAN Yongpan TU Ganfeng PAN Xiaolin YU Haiyan |
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| Affiliation: | School of Materials & Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China |
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| Abstract: | Calcium aluminate clinkers doped with Na2O were synthesized using analytically pure reagents CaCO3, Al2O3, and Na2CO3 at 1350℃ for 1 h. XRD, SEM and EDS were used to study the phase transformation of calcium aluminates and the leaching performance of clinkers from CaO-Al2O3 system doped with Na2O. The results show that the main phases of clinkers from CaO-Al2O3 system are CaO·Al2O3 and 12CaO·7Al2O3, while those of clinkers from CaO-Al2O3 system doped with Na2O are CaO·Al2O3, 12CaO·7Al2O3, Na2O·Al2O3 and Na4Ca3(AlO2)10, when the molar ratio of CaO to Al2O3 is 1.0. Some of the Na2O forms compounds containing Na2O, the rest is doped in 12CaO·7Al2O3, meanwhile nearly none of Na2O is doped in CaO·Al2O3. With the increasing of the Na2O content in clinkers, the amounts of 12CaO·7Al2O3 and Na4Ca3(AlO2)10 increase while the amount of CaO·Al2O3 decreases, and the crystallinity of 12CaO·7Al2O3 and Na4Ca3(AlO2)10 decrease while that of CaO·Al2O3 increases. Due to the doping of Na2O, the leaching performance of alumina in the clinkers using the sodium carbonate solution is improved and the space groups of CaCO3 in the leached residues are changed from R-3CH and P63/MMC to only R-3CH. |
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| Keywords: | Na2O doping sintering calcium aluminate leaching phase transformation |
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