Effect of Al_(2)O_(3)/SiO_(2) ratio on morphology of complex calcium ferrite  

作　　者：Dai-wei Yang Wei Wang Jing-xuan Li Xu-heng Chen Peng-fei Chen 

机构地区：[1]Jiangsu Yonggang Group Co.,Ltd.,Ironworks,Suzhou 215600,Jiangsu,China [2]Hubei Provincial Engineering Technology Research Center of Metallurgical Secondary Resources,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China [3]Beijing Zhiye Interconnection Technology Co.,Ltd.,Beijing 100144,China

出　　处：《Journal of Iron and Steel Research International》2023年第10期1921-1928,共8页

基　　金：This work was financially supported by the National Natural Science Foundation of China(51974212).

摘　　要：Al_(2)O_(3) and SiO_(2) greatly influence the formation of complex calcium ferrite,which is the main bonding phase in high basicity sinters.The effects of Al_(2)O_(3)/SiO_(2) ratios on the morphology of complex calcium ferrite were studied.The main mineral phases in the samples with different Al_(2)O_(3)/SiO_(2) ratios were CaFe_(2)O_(4) with a solid solution of Si or Al atoms and the silico-ferrite of calcium and aluminum.The results showed that the morphology of the complex calcium ferrite changed from lumpy to plate-like and acicular with increases in the SiO_(2) content and the Al_(2)O_(3)/SiO_(2) ratio.When the content of SiO_(2) was 4 wt.%,the main calcium ferrite morphology was acicular,and the number of macropores in the samples increased with the Al_(2)O_(3)/SiO_(2) ratio increasing.The first-principles analysis of the calcium ferrite crystal structure showed that adding SiO_(2) and Al_(2)O_(3) changed the growth mechanism of the CaFe_(2)O_(4) crystal,promoting the formation of platy and acicular complex calcium ferrite.The size of calcium ferrite was significantly smaller due to the increase in CaO-Fe_(2)O_(3)-SiO_(2)-Al_(2)O_(3) viscosity with increasing the Al_(2)O_(3)/SiO_(2) ratio.

关 键 词：Complex calcium ferrite Silico-ferrite of calcium and aluminum Al_(2)O_(3)/SiO_(2)ratio MORPHOLOGY First-principles calculation 

分 类 号：TG14[一般工业技术—材料科学与工程]