Recovery of amines, used in indirect iron ore flotation processes, involves washing slurry to separate solids from liquid to give separated liquid containing amines for further use

摘要

To recycle amines, used in an indirect iron ore flotation process, the slurry is given an optional washing and then the solids are separated from liquids. The separated liquid, containing amines, is used for further flotation. To separate amines, used in an indirect iron ore flotation process, the flotation is a conventional stirring, column or pneumatic flotation action, and it can also be a scavenger flotation stage process. The separation of solids and liquids is by conventional sedimentation with or without added flockings or flocking aids, in thickening and spiral sorters, filtration, water extraction through sieves and thickening in hydrocyclones. The separation can be by sedimentation alone or combined with filtration. The fine particles with adhering amines are gathered in a following flotation stage. The slurry can be washed, and separated solids together with amines are washed again. The washing water containing amines is used in a flotation stage. The washing is combined with mechanical energy in attrition cells, refining drums, and the like. The washing action is with or without added electrolytes and especially with or without a change in the pH value, using an organic solvent as the washing liquid. The washing and solid/liquid separation are in a multi-stage operation. When working with other materials, an electrostatic flotation can be used at a collection assembly.