氧化铬对铝型材厂碱蚀渣制备铝方柱石材料结构的影响

利用铝型材厂碱蚀渣为主要原料,采用二步煅烧工艺制备铝方柱石材料。探索二次煅烧温度对铝型材厂碱蚀渣制备铝方柱石材料相组成、结晶度、微观结构的影响,进而研究氧化铬对铝方柱石材料相组成、微观结构的影响。采用同步热分析、X射线衍射、扫描电镜及相关分析软件表征制备的铝方柱石材料的相组成和显微结构。结果表明：铝型材厂碱蚀渣中有大量可烧失成分,物料需要进行致密化处理,再经过1500℃煅烧后的铝方柱石材料结构中具有明显的铝方柱石条柱状结构,结晶度增大,铝方柱石相对含量达到91%。随着氧化铬加入量增加,结构中的铝铬酸钙相增加。当氧化铬加入量为2%时,试样中结晶相的结晶度最高,形成条柱状铝方柱石相与立方状铝铬酸钙相共存的结构。当氧化铬加入量4%时,试样中铝方柱石相几乎消失,结晶度降低。

Influence of Chromic Oxide on Preparing Gehlenite Material with Alkaline Corrosion Slag from Aluminum Profile

Gehlenite material was prepared with alkaline corrosion slag from aluminum profile by using twice calcination processes.Influences of second calcination temperature on the crystalline composition,crystalinity and microstructure of gehlenite were studied.Effects of chromic oxide addition on crystalline structure and microstructure of gehlenite material were also discussed.Changes in mass,crystalline composition and structure of sample were characterized by using thermogravimetry-differential thermal analysis,X-ray diffraction,scanning electron microscopy and analysis software.The results show that densification process of alkaline corrosion slag from aluminum profile was required to eliminate great lost.Columnar gehlenite crystal appeared in the compact structure after calcinations at 1500℃.The greatest amount of gehlenite(91%) was observed,which was considered to be better crystalinty.Calcium aluminum chromium oxide increased with increasing chromic oxide addition.When chromic oxide addition is 2%,crystalinity of crystalline phase is considered to be the best and columnar gehlenite and cubic calcium aluminum chromium oxide appeare in the crystal structure.Gehlenite almost disappears when chromium oxide addition is 4%,and crystallinity decreases.