Crystal structure and leaching performance of MgO-containing calcium aluminate clinkers doped with Na<sub>2</sub>SO<sub>4</sub>

WANG Bo; RONG Shuo; CHU Weiqin; HAO Yuanliang; SUN Huilan

doi:10.11949/j.issn.0438-1157.20160586

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Crystal structure and leaching performance of MgO-containing calcium aluminate clinkers doped with Na₂SO₄

更新时间：2025-11-26

- Crystal structure and leaching performance of MgO-containing calcium aluminate clinkers doped with Na₂SO₄
- CIESC Journal Issue 1, Pages: 467-472(2017)
- 作者机构：
  
  河北科技大学材料科学与工程学院, 河北省材料近净成形技术重点实验室,河北,石家庄,050018
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20160586
  CLC： F803.2+1
- Online First：05 January 2017，
  
  Published：05 January 2017
- 稿件说明：
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WANG Bo, RONG Shuo, CHU Weiqin, et al. Crystal structure and leaching performance of MgO-containing calcium aluminate clinkers doped with Na₂SO₄[J]. CIESC Journal, 2017, (1): 467-472. DOI: 10.11949/j.issn.0438-1157.20160586.
DOI：

WANG Bo, RONG Shuo, CHU Weiqin, et al. Crystal structure and leaching performance of MgO-containing calcium aluminate clinkers doped with Na₂SO₄[J]. CIESC Journal, 2017, (1): 467-472. DOI: 10.11949/j.issn.0438-1157.20160586. DOI：

摘要

使用分析纯MgO、CaCO3、SiO2、Al2O3与Na2SO4在1350℃保温1 h合成了掺杂Na2SO4的含MgO铝酸钙熟料，在Na2CO3溶液体系下研究了其氧化铝浸出性能，通过XRD等分析手段对其晶体结构和自粉化性能进行了研究。结果表明，Na2SO4可以显著提升铝酸钙熟料的浸出性能，Na2SO4掺杂量由0%提高到4%，熟料的氧化铝浸出率由61.89%提高到92.01%，继续添加Na2SO4，浸出性能趋于稳定。由XRD结果可知，Na2SO4促使20CaO·13Al2O3·3MgO·3SiO2（Q相）发生分解并使其转变为12CaO·7Al2O3（C12A7）。Na+进入C12A7晶格引起晶格畸变，从而提高C12A7的氧化铝浸出性能。Na2SO4的加入降低了熟料的自粉化性能，Na2SO4掺杂量由0%提高到6%，熟料的自粉率由97.46%下降到85.34%，当Na2SO4掺杂量达到10%后，熟料自粉率仅为36.3%。

Abstract

MgO-containing calcium aluminate clinkers doped with Na2SO4 were synthesized using analytical grade reagents of MgO

CaCO3

SiO2

Al2O3

and Na2SO4 at 1350℃ for 1 h.The clinkers were studied for leaching performance in sodium carbonate solution

and for crystal structure and self-disintegrating performance by XRD and SEM.Doping Na2SO4 improved leaching performance of clinkers.When Na2SO4 content was raised from 0% to 4%

Al2O3 leaching ratio of clinkers increased from 61.89% to 92.01%.The leaching tended to be stabilized with further increase of Na2SO4 dopant.XRD results showed that doping Na2SO4 caused phase transformation from 20CaO·13Al2O3·3MgO·3SiO2(Q-phase) to 12CaO·7Al2O3(C12A7).Na+ intrusion into C12A7 lattice forced lattice distortion

which probably promoted Al2O3 leaching.Na2SO4 dopant also deteriorated self-disintegration of clinkers.When Na2SO4 content increased from 0% to 6%

self-disintegrating ratio decreased from 97.46% to 85.34%

respectively.It further decreased to 36.3% for clinker with 10% Na2SO4 dopant.

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Crystal structure and leaching performance of MgO-containing calcium aluminate clinkers doped with Na2SO4

DOI：10.11949/j.issn.0438-1157.20160586

摘要

Abstract

关键词

Keywords

references

Crystal structure and leaching performance of MgO-containing calcium aluminate clinkers doped with Na₂SO₄