CAJ | 학술논문

以分析纯化学试剂CaO、Al2O3、SiO2和B2O3为原料，研究添加不同B2O3含量的CaO-Al2O3-SiO2三元系在1350℃烧结时铝酸钙熟料的自粉性能、物相形成规律、微观组织形貌及其元素分布和Al2O3的浸出性能，并通过 XRF、XRD 和 SEM-EDS 等手段探讨其作用机理。结果表明：B2O3促进2CaO?Al2O3?SiO2的生成，并抑制β-2CaO?SiO2向γ-2CaO?SiO2的转变，明显降低熟料的自粉性能；B2O3在铝酸钙熟料中均匀分布，其加入使铝酸钙熟料中12CaO?7Al2O3和CaO?Al2O3的晶胞参数增加，固溶至铝酸钙晶体中引起晶胞的扩胀；铝酸钙熟料的Al2O3浸出率随着B2O3含量的增加急剧下降，当B2O3添加量由0增加到0.20%(质量分数)时，Al2O3浸出率由95.01%降低至72.03%，添加B2O3后铝酸钙熟料中生成的2CaO?Al2O3?SiO2和难以浸出的12CaO?7Al2O3是其Al2O3浸出率明显降低的主要原因。
이분석순화학시제CaO、Al2O3、SiO2화B2O3위원료，연구첨가불동B2O3함량적CaO-Al2O3-SiO2삼원계재1350℃소결시려산개숙료적자분성능、물상형성규률、미관조직형모급기원소분포화Al2O3적침출성능，병통과 XRF、XRD 화 SEM-EDS 등수단탐토기작용궤리。결과표명：B2O3촉진2CaO?Al2O3?SiO2적생성，병억제β-2CaO?SiO2향γ-2CaO?SiO2적전변，명현강저숙료적자분성능；B2O3재려산개숙료중균균분포，기가입사려산개숙료중12CaO?7Al2O3화CaO?Al2O3적정포삼수증가，고용지려산개정체중인기정포적확창；려산개숙료적Al2O3침출솔수착B2O3함량적증가급극하강，당B2O3첨가량유0증가도0.20%(질량분수)시，Al2O3침출솔유95.01%강저지72.03%，첨가B2O3후려산개숙료중생성적2CaO?Al2O3?SiO2화난이침출적12CaO?7Al2O3시기Al2O3침출솔명현강저적주요원인。
Calcium aluminate clinkers containing different contents of B2O3 in CaO-Al2O3-SiO2 system sintered at 1350℃were obtained by using analytical reagents of CaO, Al2O3, SiO2 and B2O3 as raw materials. The pulverization, mineralogical formation characteristic, microstructure, elemental distribution and alumina leaching property of clinkers were studied by XRF, XRD and SEM-EDS. The results show that B2O3 promotes the formation of 2CaO?Al2O3?SiO2 and inhibits the conversion of β-2CaO?SiO2 to γ-2CaO?SiO2, which deteriorates the pulverization property of calcium aluminate clinker. B2O3 distributes uniformly in the calcium aluminate clinker, and the crystal parameters of 12CaO?7Al2O3 and CaO?Al2O3 increase with the increase of B2O3 addition, indicating that B2O3 forms solid solutions in calcium aluminates to increase their crystal cell parameters. The Al2O3 leaching rate of calcium aluminate clinkers decreases quickly with the increasing of B2O3 addition, which decreases from 95.01% to 72.03% as the B2O3 addition increases from 0 to 0.20%(mass fraction). The main reason of the obvious decrease in the Al2O3 leaching rate of calcium aluminate clinker is the formation of 2CaO?Al2O3?SiO2 and the unleached 12CaO?7Al2O3 in sodium carbonate solution.