本文選題：燒結 + 復合鐵酸鈣�。� 參考：《華北理工大學》2017年碩士論文

【摘要】：研究Al_2O_3、MgO含量對CaO-Fe_2O_3二元系鐵酸鈣生成的影響,分析Al_2O_3、MgO在燒結中的作用;通過對不同溫度下燒結礦相組成、含量分析,研究燒結過程中礦相種類、含量變化,以及Al_2O_3、MgO在礦相中擴散路徑,闡明復合鐵酸鈣生成機理。研究主要結論如下:1)在CaO-Fe_2O_3二元系中,MgO含量由0.5%增加至1.5%,利于鐵酸鈣生成,MgFe_2O_4與鐵酸鈣反應生成鎂復合鐵酸鈣;MgO含量超過1.5%之后,磁鐵礦含量增多,抑制鐵酸鈣生成。Al_2O_3含量由1.5%增加到3.5%時,燒結礦礦相由鐵酸鈣向復合鐵酸鈣轉變,促進復合鐵酸鈣生成。2)CFA生成過程中,首先生成C_2F和CA_2,CA_2與C_2F形成CA_2/C_2F界面,溫度升高至800℃左右,C_2F/CA_2界面轉變?yōu)镃F/CA_2界面,CF、CA_2與Fe_2O_3反應生成CFA(850℃-900℃);C_2F、Al_2O_3與Fe_2O_3可直接生成CFA(900℃-950℃),CA_2核的反應是CFA生成的限制環(huán)節(jié)。3)復合鐵酸鈣的生成是礦相中CFA反應、消失的過程。Al_2O_3顆粒周圍形成CA_2、CFA層,低溫時CFA主要與Fe_2O_3、MgFe_2O_4及少量鈣鎂硅酸鹽生成SFCA,較高溫度時CFA主要與Fe_2O_3、鈣鎂硅酸鹽及少量MgFe_2O_4生成SFCA;溫度1250℃時,不含CA_2區(qū)域SFCA易分解生成磁鐵礦,含區(qū)CA_2域SFCA未發(fā)現(xiàn)分解。低SiO_2含量利于CFA反應,促進復合鐵酸鈣生成。
[Abstract]:The effect of Al2O3MgO content on the formation of calcium ferrate in CaO-Fe_2O_3 binary system was studied, and the role of Al2O3MgO in sintering process was analyzed. By analyzing the composition and content of sinter phases at different temperatures, the types and contents of mineral phases in the sintering process were studied. The diffusion path of Al2O3MgO in ore phase was also discussed, and the formation mechanism of composite calcium ferrate was explained. The main conclusions are as follows: (1) in CaO-Fe_2O_3 binary system, the content of MgO increases from 0.5% to 1.5%, which is beneficial to the formation of MgFe2O4 from calcium ferrate to calcium ferrate, and the content of magnetite increases when the content of MgFe2O4 reacts with calcium ferrate to form more than 1.5% MgO. When inhibiting the formation of calcium ferrate from 1.5% to 3.5%, the sinter phase changes from calcium ferrate to calcium ferrate compound, and during the process of promoting the formation of calcium ferrate, the CA_2/C_2F interface between C2F and CA2CTAS2 and C2F is first formed. When the temperature rises to about 800 鈩，

本文編號：1988586