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

doi:10.11949/j.issn.0438-1157.20141264

Abstract

Abstract:

Calcium aluminate clinkers doped with Na₂O were synthesized using analytically pure reagents CaCO_3, 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.

Key words: Na₂O doping, sintering, calcium aluminate, leaching, phase transformation

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。

关键词: Na₂O掺杂, 烧结, 铝酸钙, 浸取, 物相转化

CLC Number:

TF803.21

TIAN Yongpan, TU Ganfeng, PAN Xiaolin, YU Haiyan. Phase transformation and leaching performance of Na₂O-doping calcium aluminate compounds[J]. CIESC Journal, 2015, 66(4): 1551-1556.

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.

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

Na₂O掺杂铝酸钙化合物物相转化与浸出性能

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