高铝熔渣物相析出演变规律研究  

Study on Evolution of Phase Precipitation in High Aluminum Slags

作　　者：李强 潘涛 张翰洋 丁浩 LI Qiang;PAN Tao;ZHANG Han-yang;DING Hao(School of Metallurgy,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学冶金学院,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2018年第7期995-999,共5页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(51574064);中央高校基本科研业务费专项资金资助项目(N140204008)

摘　　要：以改善高铝渣浸出性能为目标,采用DSC实验和SEM-EDS检测方法,研究了高铝渣控温冷却过程中物相析出规律,考察了降温速率、n(CaO)/n(Al_2O_3)和MgO含量对铝酸钙渣物相析出演变规律的影响.结果表明:当降温速率加快时,熔渣凝固过程趋于更大程度的偏析,C_2 S相变愈不充分,粒度粗化,劣化了自粉行为和浸出条件;随着调高渣中n(CaO)/n(Al_2O_3),C12A7的析出温度升高,物相析出活性按照CA→C12A7→C3A逐渐增强;当渣中含有MgO时,物相中出现C_2MS_2,不利于C_2 S物相转变,更为重要的是MgO富集在含铝物相中形成Q相。To improve the leaching performance of high alumina slags,DSC and SEM-EDS analyses were employed to study the phase precipitation behaviors of high alumina slags during solidification with controlled cooling rates. The effects of cooling rate,n（ CaO）/n（ Al2 O3） and MgO content on the evolution of phase precipitation were discussed. The results show that when the cooling rate increases,the solidification process tends to have severer segregation,the C2 S phase transformation becomes more insufficient and the particle turns obviously coarse,so that the self-pulverization and leaching performance deteriorate. With the increase of n（ CaO）/n（ Al2 O3）in the slags,the precipitation temperature of C12 A7 rises and the activities of precipitation phases increase gradually as CA→C12 A7→C3 A. When the slags contains MgO,the phase of C2 MS2 appears,which is detrimental to the phase transition of C2 S. More importantly,MgO enriching in aluminum-bearing phase leads to the formation of Q phase,which deteriorates greatly the leaching and recovery rate of alumina.

关 键 词：高铝渣 物相析出 降温速率 CaO与Al2O3物质的量比 MGO含量 

分 类 号：TF821[冶金工程—有色金属冶金]