Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8011697 | Transactions of Nonferrous Metals Society of China | 2018 | 8 Pages |
Abstract
Bauxite residue, a highly saline solid waste produced from digestion of bauxite for alumina production, is hazardous to the environment and restricts vegetation establishment in bauxite residue disposal areas. A novel water leaching process proposed here was used to investigate the dynamic migration and vertical distribution of saline ions in bauxite residue. The results show that water leaching significantly reduced the salinity of bauxite residue, leaching both saline cations Na+, K+, Ca2+ and anions CO2â3, SO2â4, HCOâ3. Na+ and K+ migrated from 40-50 to 20-30 cm of the column, presenting a high migration capacity. The migration capacity of Ca2+ was lower and accumulated at 30-40 cm of the column. CO2â3 initially distributed at 20-30 cm of the column, subsequently transported to 30-40 cm of the column, and finally returned to 20-30 cm of the column along with evaporation. SO2â4 was originally distributed at 40-50 cm, but finally migrated to 20-30 cm of the column. Nevertheless, HCOâ3 remained at the bottom of the column, and its migratory was less affected by evaporation.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Xiang-feng KONG, Xing-xing JIANG, Sheng-guo XUE, Ling HUANG, William HARTLEY, Chuan WU, Xiao-fei LI,