Phase transformation and leaching performance of Na<sub>2</sub>O-doping calcium aluminate compounds

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Phase transformation and leaching performance of Na₂O-doping calcium aluminate compounds

更新时间：2025-12-10

- Phase transformation and leaching performance of Na₂O-doping calcium aluminate compounds
- CIESC Journal Issue 4, Pages: 1551-1556(2015)
- 作者机构：
  
  东北大学材料与冶金学院,辽宁,沈阳,110819
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20141264
  CLC： F803.2+1
- Online First：05 April 2015，
  
  Published：05 April 2015
- 稿件说明：
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TIAN Yongpan, TU Ganfeng, PAN Xiaolin, et al. Phase transformation and leaching performance of Na₂O-doping calcium aluminate compounds[J]. CIESC Journal, 2015, (4): 1551-1556. DOI: 10.11949/j.issn.0438-1157.20141264.
DOI：

TIAN Yongpan, TU Ganfeng, PAN Xiaolin, et al. Phase transformation and leaching performance of Na₂O-doping calcium aluminate compounds[J]. CIESC Journal, 2015, (4): 1551-1556. DOI: 10.11949/j.issn.0438-1157.20141264. DOI：

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。

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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