Structural improvement of age-hardened gypsum-treated bauxite red mud waste using readily decomposable phyto-organics |
| |
Authors: | Mark Anglin Harris |
| |
Institution: | (1) College of Natural and Applied Sciences, Northern Caribbean University, Mandeville, Jamaica W.I. |
| |
Abstract: | Several years (7) after incidental lithification by added gypsum, the effect of crushing and phyto-organics on some physical
properties of red mud wastes (RMW) was examined under laboratory conditions. It was hypothesized that mechanically breaking
up the hardened masses would increase their permeability. However, on the contrary, crushing these rock-hard masses into <2-mm
particles did not increase permeability. A phyto-organic treatment on the other hand greatly improved permeability of the
crushed entities such that infiltration rates increased from 0 to 10 cm/h. After 24 weeks of incubation, the structure of
the newly formed phyto-organically treated gypsum-hardened RMW aggregates was also substantially improved over that of the
controls, as a >3-fold increase in resistance to disintegration during wet sieving was exhibited by the phyto-organically
treated samples. The increase in water infiltration by combining crushing with phyto-organic applications was ascribed to
a decrease in particle dispersion, creating more stable clay clusters, which in turn stabilized channels and pores. Conversely,
it was concluded that the singular crushing of gypsum-hardened bauxite waste in the waste dumps is potentially wasteful and
ineffective. |
| |
Keywords: | Red muds Bauxite wastes Organic remediation Gypsum-organic amendments Western Australia Jamaica WI |
本文献已被 SpringerLink 等数据库收录! |
|