Sodium-modification of Ca-based bentonite via semidry process  

作　　者：黄艳芳 张元波 韩桂洪 姜涛 李光辉 杨永斌 许斌 郭宇峰 

机构地区：[1]School of Resources Processing and Bioengineering,Central South University

出　　处：《Journal of Central South University》2010年第6期1201-1206,共6页中南大学学报（英文版）

基　　金：Project(50725416) supported by the National Science Fund for Distinguished Young Scholars; Project(50804059) supported by the National Natural Science Foundation of China; Project(2008BAB32B06) supported by the Key Project in the National Science and Technology Pillar Program during the 11th Five-Year Plan Period;Project(200805331080) supported by the Specialized Research Fund for the Doctoral Program of Higher Education

摘　　要：In order to improve the quality of Hunyuan inferior Ca-based bentonite （Ca-Bent）, semidry process was used to modify Ca-Bent into superior Na-based bentonite （Na-Bent）. The factors affecting sodium-modification were investigated. The optimized experimental parameters are obtained as follows： Na2CO3 dosage 4.0%, ageing time 25 d, briquetting pressure 25 MPa and briquetting moisture 20%. Under the optimization conditions, the modified Na-Bent has a colloid value of 73.6 mL/（3g）, dilation of 38 mL/g and water absorption in 2 h （2HWA） of 465%, respectively. The bailing results indicate that the modified Na-Bent pellets have higher drop strength and compression strength than the Ca-Bent pellets.In order to improve the quality of Hunyuan inferior Ca-based bentonite(Ca-Bent),semidry process was used to modify Ca-Bent into superior Na-based bentonite(Na-Bent).The factors affecting sodium-modification were investigated.The optimized experimental parameters are obtained as follows:Na2CO3 dosage 4.0%,ageing time 25 d,briquetting pressure 25 MPa and briquetting moisture 20%.Under the optimization conditions,the modified Na-Bent has a colloid value of 73.6 mL/(3g),dilation of 38 mL/g and water absorption in 2 h(2HWA) of 465%,respectively.The balling results indicate that the modified Na-Bent pellets have higher drop strength and compression strength than the Ca-Bent pellets.

关 键 词：Ca-Bent Na-Bent sodium-modification semidry process pellet binder 

分 类 号：TD985[矿业工程—选矿]