A METHODOLOGY TO DETERMINE COLLECTOR ADSORPTION ON SULPHIDE MINERALS USING ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY ANALYSIS

摘要

The present invention relates to a methodology to measure floatability of sulphide minerals in froth flotation plants based on density of collector adsorption on different mineral phases on mineral electrodes (2) using three electrode (2) electrochemical impedance spectroscopy (EIS) analysis using different size fraction mineral electrodes (2) as working electrodes (2). The electrode assembly 10 was designed in three parts, mineral-graphite pellet electrode (2), copper wire (4) connection and Teflon body (7) by mixing mineral particles and graphite in the ratio of 2:1. A conductive binder (3) is also added to the mixture to increase the strength of the pellet and the mixture is pressed in a die under 200 kN pressure. Steps of mineralogical analysis of electrodes (2), derivation of a surface coverage 15 calibration curve for different collector concentrations, determination of equivalent electrical circuit model, EIS measurements in a measurement medium and flotation rate constant or copper recovery prediction with respect to collector adsorption, are conducted.