Research on Mechanisms of Improving Flotation Selectivity of Coal Slime by Adding Sodium Polyphosphate

A high percentage of high-ash fine slime materials can deteriorate flotation selectivity through surface covering. This covering the is one issues that need to be addressed for efficient processing difficult-to-separate and coals. In this study, we investigated depression effect SPP on mud by kinetic tests. We also revealed mechanism enhanced coals means Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS), Atomic Force (AFM) analyses. The results showed under best condition dosage, clean coal with 9.75% ash content 76.76% yield was obtained. Compared blank group, decreased 2.39%, while only reduced 2.18% in presence SPP. reason addition stripping dispersion gangue from particle surface. result a reduction cover grain an increase hydrophobic sites surface, thereby depressing non-selective enhancing adsorption collector concentrate decreased, but remained almost unchanged, which main better performance as depressant compared conventional depressants.