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《材料导报》期刊社  2018, Vol. 32 Issue (2): 301-306    https://doi.org/10.11896/j.issn.1005-023X.2018.02.028
  物理   材料研究 ｜材料 |
SiO2基酸化剂高温消解转炉钢渣中游离CaO的研究
尹啸,张崇民,杨骥,李博洋,王国承
辽宁省化学冶金重点实验室,鞍山 114051
Research on Stabilization of Free CaO in Basic Oxygen Furnace Slag with
Acidifier at High Temperature SiO2Bearing, , , ,
YIN Xiao, ZHANG Chongmin, YANG Ji, LI Boyang, WANG Guocheng
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摘要 

转炉钢渣中游离CaO的水化膨胀是导致转炉钢渣体积安定性不良的重要原因。通过高温配加SiO2基酸化剂,改变w(SiO2)/w(CaO)对转炉钢渣进行稳钙改质处理。利用化学检测分析、X射线衍射和场发射扫描电子显微镜对SiO2基酸化剂高温消解转炉钢渣中游离CaO的效果和特征进行研究。结果表明,改质后的转炉钢渣的w(SiO2)/w(CaO)在0.37以上,就能满足钢渣中f-CaO低于3%的水泥和混凝土行业使用标准,且消解率达到60%以上,而当w(SiO2)/w(CaO)为0.67时,f-CaO低于1%,且消解率达到90%以上;改质前后转炉钢渣的矿相组成有明显差异,改质后转炉钢渣以硅酸二钙、镁黄长石、镁铁尖晶石、磁铁矿和铁铝酸钙相为主,并且镁黄长石相随着w(SiO2)/w(CaO)的增大而增多;转炉钢渣酸化稳钙前f-CaO被紧密包裹在矿相基体中,高温酸化改质后,团簇状聚集的f-CaO颗粒会嵌在硅酸盐相间,无明显包裹现象,尺寸为0.52 μm。
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作者相关文章
尹啸
张崇民
杨骥
李博洋
王国承
关键词:  转炉钢渣  SiO2基酸化剂  改质  游离CaO  矿相组成    
               出版日期:  2018-01-25      发布日期:  2018-01-25
ZTFLH:  TF09  
基金资助: 国家自然科学基金(51174111)
引用本文:    
尹啸,张崇民,杨骥,李博洋,王国承. SiO2基酸化剂高温消解转炉钢渣中游离CaO的研究[J]. 《材料导报》期刊社, 2018, 32(2): 301-306.
Acidifier at High Temperature SiO2Bearing, , , , . Research on Stabilization of Free CaO in Basic Oxygen Furnace Slag with. Materials Reports, 2018, 32(2): 301-306.
链接本文:  
http://www.mater-rep.com/CN/10.11896/j.issn.1005-023X.2018.02.028  或          http://www.mater-rep.com/CN/Y2018/V32/I2/301
FeO Fe2O3 CaO SiO2 MgO
14.68 0.70 49.38 10.56 12.00
MnO Al2O3 P2O5 Others
5.25 2.02 2.61 2.80
表1  转炉钢渣的化学成分(质量分数/%)
图1  (a)转炉钢渣和(b)石英砂的表观形貌
Content S1 S2 S3 S4 S5
w(SiO2)/w(CaO) 0.37 0.42 0.48 0.56 0.67
w(f-CaO)/% 2.98 2.68 2.02 1.24 0.70
表2  不同w(SiO2)/w(CaO)条件下稳钙改质转炉钢渣中f-CaO的含量
图2  f-CaO消解率随w(SiO2)/w(CaO)的变化曲线
图3  转炉钢渣的XRD谱
Mineralogical phase S1 S2 S3 S4 S5
MgO·Fe2O3 √ √ √ √ √
CaO·MgO·2SiO2 √ — — — —
2CaO·MgO·2SiO2 — √ √ √ √
2CaO·SiO2 √ √ √ √ √
2CaO·Fe2O3 — — — — √
Ca2(Al,Fe)2O5 √ √ √ √ √
Fe3O4 √ √ √ √ √
Fe2O3 — — — — √
表3  改质后转炉钢渣的主要物相组成
Sample CaO MgO FeO MnO Al2O3 SiO2
BOFS 81.90 5.12 8.01 4.97 — —
S2 79.55 5.57 6.44 — 5.98 2.47
表4  改质前后转炉钢渣中f-CaO的EDS分析(质量分数/%)
图4  改质前后转炉钢渣的XRD谱
图5  改质前后转炉钢渣的FESEM照片
Number Reaction ΔfGmΘ/(J·mol-1)
1 SiO2(s)+CaO(s)=
CaO·SiO2(s)		 -92 500+2.5T
2 SiO2(s)+2CaO(s)=
2CaO·SiO2(s)		 -118 800-11.3T
3 2SiO2(s)+3CaO(s)=
3CaO·2SiO2(s)		 -236 800+9.6T
4 SiO2(s)+3CaO(s)=
3CaO·SiO2(s)		 -118 800-6.7T
表5  主要硅酸钙化合物的标准生成吉布斯自由能
Content S1 S2 S3 BOFS
w(C3S)/w(C2S) 11.06 1.77 0.44 —
w(CaO)/w(C2S) 0.29 0.19 0.08 0.98
表6  C3S/C2S与CaO/C2S的质量比理论值
图6  CaO-SiO2二元相图[23]
No. Source Form Size/μm Characteristics
1 H Suito et al[25] Undissolved particles 3—30 Spongy, grainy
2 F Wachsmuth et al[26] Precipitate from melt <4 Grainy
3 J Waligora et al[5] Decomposition from C3S 1—3 Micro-inclusion
This work Before stabilization Undissolved particles+
Precipitate from melt		 2—20 Ellipsoid-like
This work After stabilization Precipitate from melt+
Decomposition from C3S		 0.5—2 Clustered ball-like
表7  钢渣中f-CaO的分类以及特征
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