Abstract
Flotation is a physicochemical process utilizing the difference in surface properties of particles for their separation. One of the common methods to study the surface properties of the particle is by using Inverse gas chromatography (IGC). It can be used to estimate the surface energies, surface energy heterogeneity, work of adhesion, and index of hydrophilicity of a given sample, thus predicting their flotation behavior.This paper utilizes the IGC method to determine the surface energy heterogeneity of waste printed circuit boards (PCB) rejects, also known as the nonmetal fraction (NMF). The test was performed to observe if any differences exist in the surface energy of NMF particles that might provide preliminary information regarding their response to flotation. The results showed that the distribution of surface energies is narrow and reached a plateau by 10% surface coverage. It suggests that approximately 10% of all the available particle surfaces have relatively higher surface energy compared to other particles that would report to the tailings (remain in water) if subjected to flotation without any reagent and further grinding.
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