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 we...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.展开更多
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+1 种基金 Project(2008BAB32B06) supported by the Key Project in the National Science and Technology Pillar Program during the 11th Five-Year Plan PeriodProject(200805331080) supported by the Specialized Research Fund for the Doctoral Program of Higher Education
文摘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.
