Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9632609 | Hydrometallurgy | 2005 | 18 Pages |
Abstract
The process including heavy metals and ammonium extraction from waters by an extraction medium based on unsaturated fatty acids and their soaps, up-concentration of the extracted metals, and regeneration of the extraction medium was investigated. The process corresponds to current hydroxides-precipitating, coagulation and biotreatment processes. The two synergistically effective ways are described: the basic process with the pretreatment of feed water by sodium or calcium hydroxide and extraction with unsaturated fatty acids, and the advanced process exploiting the extraction through sodium and/or calcium unsaturated fatty acids soaps. Oleine as a commercially available extraction medium was used. High bonding capacity and metals removal efficiency, fast kinetics and selectivity for the extraction process, and the self-adjustment of the pH value after the extraction process, as well as the high up-concentration of the metals salts limiting to saturated solutions, and the complete regeneration of the extraction medium were reached. Heavy metals hydroxides precipitation behaviour was investigated. Chemical and hydrophobisation metals-bonding mechanisms for the extraction process were observed. Regeneration and up-concentration behaviour, Oleine stability and organics residues in the water phases were investigated.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
J. Šiška,