Recent developments and advances in formulations and applications of chemical reagents used in froth flotation

Abstract

Over the last two decades, significant advances have been made in the field of chemical reagents used in froth flotation, a solids separation technique whose success depends on the use of a wide variety of both inorganic and organic reagents, including polymers, for controlling the wetting behavior of solid surfaces, particle dispersion or aggregation, and bubble stability. Novel discoveries include new chemistries of reagents, especially collectors, depressants and frothers, new blends of known chemical compounds, new applications of known reagents, and the development of scientific methodologies for reagents design and testing of potential formulations. Even though the most important application of froth flotation has been the processing of raw materials, in recent years new applications of flotation continue to grow. Depletion of easy-to-process, high-grade ores and an increasing demand for clean technologies require new flotation reagents, that are environmentally friendly, more versatile, and economic. This article reviews recent developments of new chemistries for froth flotation, some of which are now available as commercial products, and their applications.