锂化膨润土在铸造湿型砂中的应用  

Application of Lithium Modification of Bentonite in Foundry Green Sand

作　　者：孙亚琴[1] 潘嘉祺[1] 陈麒忠[1] 平艳盈[1] 周晓洁[1] 

机构地区：[1]上海应用技术学院材料科学与工程学院,上海200235

出　　处：《铸造技术》2010年第7期823-826,共4页Foundry Technology

基　　金：上海市重点学科建设资助项目;项目编号:P1502

摘　　要：用碳酸锂作改性剂对膨润土进行锂化改性,制备出锂化膨润土,测定改性前后膨润土的基本性能及其结构,研究用锂化膨润土代替现有膨润土对型砂性能的影响。结果表明,经改性后,锂化膨润土的性能和结构发生了改变,其面网间距减小,结合水分子含量减小;在最佳锂化条件下,自由膨胀体积由10.0增加到18.0,胶质价由54.5增加到79.0。与原膨润土相比,锂化膨润土的加入改善了湿型砂的性能,最佳加入量为8%。The bentonite is modified by Li2CO3. and lithium-based bentonite has been prepared for this experiment. The basic properties and structure of lithium modification of bentonite are tested and compared with original bentonite. Meanwhile, the properties of foundry green sand are tested with lithium-base bentonite in stead of original bentonite. The results showed that. the structure of lithium-base bentonite has changed by reducing its floor space and combined water and the free swelling volume. At the optimum modification conditions the swelling value can increase from 10.0 to 18. 0 and gelatin value increase from 54. 5 to 79. Compared with the original bentonite modification, lithium-base bentonite can improve the properties of green sand and the optimum added content is 8 %.

关 键 词：锂化膨润土 改性 型砂性能 

分 类 号：TG221[金属学及工艺—铸造] TD985[矿业工程—选矿]