焙烧对自蔓延法制备的CaB_6粉末中氯含量的影响  

Effect of Roasting on Chlorine Content in Powdered CaB_6 Prepared by Self-Propagating High-Temperature Synthesis

作　　者：豆志河[1] 张廷安[1] 牛丽萍[1] 赫冀成[1] 

机构地区：[1]东北大学多金属共生矿生态化利用教育部重点实验室,辽宁沈阳110004

出　　处：《东北大学学报（自然科学版）》2010年第2期210-213,共4页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(50374026,50644016,50874027);国家重点基础研究发展规划项目(2007CB613504)

摘　　要：考察了焙烧温度及焙烧时间对自蔓延法制备的CaB6中氯含量的影响,利用DSC,XRD及SEM等技术对产物进行了表征.结果表明:自蔓延反应产物是由CaB6,MgO及少量的Ca3(BO3)2和Mg3(BO3)2相组成;浸出产物为纯净的CaB6,其质量分数为96.82%,氯残留量为0.36%.随着焙烧温度升高及焙烧时间的增加,CaB6中氯去除率增加;720℃焙烧6 h,CaB6中氯去除率可达80.12%;焙烧温度过高,氯去除率下降,同时CaB6会氧化变质.To discuss the effects of roasting temperature/time on the Cl content in powder CaB6 synthesized by SHS （self-propagating high-temperature synthesis） process, the CaB6 was characterized by DSC, XRD and SEM. The results indicated that the products from SHS include CAB6, MgO and little of both Ca3（BO3）2 and Mg3（BO3）2, and the leached product is so pure that the mass fraction of CaB6 is 96.82wt %, and the residue Cl content in CaB6 is only 0.36 %. The removal rate of Cl from CaB6 increases with the roasting temperature/time increasing, e.g. , the removal rate of CI can be up to 80.12% after roasting CaB6 for 6hr at 720 ℃. However, over temperature will degrade CaB6 due to oxidation with decreasing removal rate of Cl.

关 键 词：自蔓延高温合成 焙烧 CaB6 滴定分析 

分 类 号：TF123[冶金工程—粉末冶金]