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.
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
