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|After several years of laboratory and field evaluations, it has been established that each frother has its own unique relationship among bubble size reduction, gas hold-up increase, froth stabilization and frother concentration. It has been shown that a frother?s hydrodynamic properties can be characterized using the relationship between the froth zone property froth height and the pulp zone property gas hold-up. The relationship is established in a bubble column run at a given air rate over a range of frother concentration. The use of relationships in frother selection and plant diagnostics is illustrated in a series of plant case studies.|