Mineralogy & Flotation: Floatability VS Selectivity Test Assessment

Mineralogy is the driving force behind flotation performance. A flotation batch and rate test measures this as mass pull recovery and concentrate grade. The real data from a rate test can be processed to determine the flotation kinetics of metal, mineral and gangue. What we cover here is what are kinetics and what do they mean. Special attention is paid to the definition of floatable gangue. How flotation kinetics are used to understand and optimized flotation performance is covered in the next series. Two other articles describe how a rate test is conducted and what concentrate collection times should be used. A laboratory batch test or measurements done a bank of pilots or production scale plant cells generates a recovery grade and concentrate mass profiled with time. These profiles describe the flotation response and performance of the ore under whatever conditions are in effect at the time. In 1961 Kelsall developed a first order two component equation to fit these profiles. Flotation performance is described in terms of Fast and Slow components; each has a fraction and a rate. R. is the cumulative recovery at time T. Feta is a slow floating fraction and KS is a slow floating rate. Fast floating … Continue reading Mineralogy & Flotation: Floatability VS Selectivity Test Assessment