Influence of calcium/aluminum ratio on microstructure and leaching of 11.3CaO·7Al2O3

doi:10.3969/j.issn.0438-1157.2014.10.057

Abstract

Abstract: Calcium aluminate clinkers with different calcium/aluminum ratios (C/A) were obtained by the high-temperature sintering method. Phase composition, phase semi-quantitative content and crystal constant of sinter were studied with different C/A by XRD. SEM and EDS were used to observe microstructure and element contents. The alumina leaching property of sinter was studied. When C/A was lower than 1.6, the products were CaO·Al₂O₃and 11.3CaO·7Al₂O₃ (C_11.3A₇) and increase of calcium/aluminum ratio could lead to increase in the content of C_11.3A₇and leaching ratio of alumina. When C/A was 1.6, the phase was almost completely C_11.3A₇and the leaching rate of alumina reached a maximum. When C/A was higher than 1.6, the products were C_11.3A₇and 3CaO·Al₂O₃, and the leaching rate of alumina decreased accordingly. The lack of CaO in C_11.3A₇lattice improved the leaching reaction.

Key words: sintering, calcium/aluminum ratio, 11.3CaO·7Al₂O₃, microstructure, alumina, leaching rate

摘要： 通过高温烧结法在不同钙铝比（C/A）的条件下合成了铝酸钙熟料。利用XRD对不同C/A下合成产物进行物相分析，对含量进行半定量分析，并计算其晶格常数。采用SEM观察不同C/A下合成产物的显微结构，并通过EDS佐证所得物相；最后研究了不同C/A下氧化铝的溶出性能。结果表明：当C/A<1.6时得到的产物为CaO·Al₂O₃和11.3CaO·7Al₂O₃（C_11.3A₇），且随着C/A的增大，C_11.3A₇的含量增高，氧化铝的溶出率提高；当C/A＝1.6时得到的产物只有C_11.3A₇，溶出率达到最大；当C/A>1.6时由于3CaO·Al₂O₃的形成，溶出率有所降低。C_11.3A₇晶格中CaO的缺失，促进了溶出反应的进行。

关键词: 烧结, 钙铝比, 11.3CaO·7Al₂O₃, 显微结构, 氧化铝, 溶出率

CLC Number:

TF803.21

WANG Bo, ZONG Shufeng, SUN Huilan, ZHANG Jianxin. Influence of calcium/aluminum ratio on microstructure and leaching of 11.3CaO·7Al₂O₃[J]. CIESC Journal, 2014, 65(10): 4183-4190.

王波, 宗书凤, 孙会兰, 张建新. 钙铝比对11.3CaO·7Al₂O₃微观结构及其溶出性能的影响[J]. 化工学报, 2014, 65(10): 4183-4190.

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Influence of calcium/aluminum ratio on microstructure and leaching of 11.3CaO·7Al₂O₃

钙铝比对11.3CaO·7Al₂O₃微观结构及其溶出性能的影响

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