Containing Bauxite Liquor Using Bentonite-Polymer Composite Geosynthetic Clay Liners
Experiments were conducted to evaluate the hydraulic conductivity of geosynthetic clay liners(GCLs)to bauxite liquor from aluminum refining.Tests were conducted with a GCL containing conventional sodium-bentonite(Na-B)and one GCLs containing a bentonite-polymer composite.B-P has polymer loading of 6.8%.Hydraulic conductivity tests were conducted on the GCLs with bauxite liquor in flexible-wall permeameters following procedures in ASTM D6766.The bauxite liquor used in the experiments has pH 13 and ionic strength = 700 mM.Hydraulic conductivity of the Na-B GCL increased to approximately 10-7 m/s during permeation,whereas the B-P GCL maintained low hydraulic conductivity(~4.3×10-12 m/s).Suppression of bentonite swelling by the bauxite liquor is the primary factor responsible for the higher hydraulic conductivity of the Na-B GCL.Low hydraulic conductivity of the B-P GCL to bauxite liquor is attributed to polymer clogging intergranular pores controlling flow of bauxite liquor through the GCL.The findings indicate that B-P GCLs with sufficient polymer loading can be used effectively in composite liners for disposal facilities containing bauxite liquor.
Bauxite liquor Bentonite-polymer composite Geosynthetic clay liner Hydraulic conductivity
Kuo Tian Craig H.Benson
George Mason University,Fairfax,VA 22020,USA University of Virginia,Charlottesville,VA 22904,USA
国际会议
The 8th International Congress on Environmental Geotechnics(第八届国际环境土工大会)
杭州
英文
672-678
2018-10-28（万方平台首次上网日期，不代表论文的发表时间）