Na2SO4掺杂含MgO铝酸钙熟料的结构表征及浸出性能  

Crystal structure and leaching performance of MgO-containing calcium aluminate clinkers doped with Na_2SO_4

作　　者：王波[1] 荣朔 楚维钦 郝圆亮 孙会兰[1] 

机构地区：[1]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

出　　处：《化工学报》2017年第1期467-472,共6页CIESC Journal

基　　金：国家自然科学基金项目(51104053);河北省自然科学基金项目(E2016208107);河北省高等学校科学技术研究项目(BJ2016023,QN2015002)~~

摘　　要：使用分析纯MgO、CaCO_3、SiO_2、Al_2O_3与Na_2SO_4在1350℃保温1 h合成了掺杂Na_2SO_4的含MgO铝酸钙熟料,在Na_2CO_3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,Na_2SO_4可以显著提升铝酸钙熟料的浸出性能,Na_2SO_4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Na_2SO_4,浸出性能趋于稳定。由XRD结果可知,Na_2SO_4促使20CaO·13Al_2O_3·3MgO·3SiO_2(Q相)发生分解并使其转变为12CaO·7Al_2O_3(C_(12)A_7)。Na+进入C_(12)A_7晶格引起晶格畸变,从而提高C_(12)A_7的氧化铝浸出性能。Na_2SO_4的加入降低了熟料的自粉化性能,Na_2SO_4掺杂量由0%提高到6%,熟料的自粉率由97.46%下降到85.34%,当Na_2SO_4掺杂量达到10%后,熟料自粉率仅为36.3%。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 20 CaO·13Al2O3·3MgO·3SiO2（Q-phase） to 12 CaO·7Al2O3（C（12）A7）. Na＋ intrusion into C（12）A7 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.

关 键 词：铝酸钙 烧结 氧化铝浸出 Q相 Na2SO4掺杂 

分 类 号：TF803.21[冶金工程—有色金属冶金]