Bench-scale flotation of chrysocolla with n-octanohydroxamate

Raman spectroscopy, Fourier transform infrared (FTIR) spectroscopy, atomic absorption spectroscopy (AAS) and X-ray photoelectron spectroscopy (XPS) have been employed to characterise the surface layer and compound formation during the interaction of n-octanohydroxamate with chrysocolla and malachite surfaces. The flotation response of a single mineral chrysocolla–quartz sand sample and mixed chrysocolla–malachite–quartz sand sample using n-octanohydroxamate collector has been investigated. Recoveries of 95% were achieved in bench-scale flotation testing, with the best Cu grades achieved at pH > 9. Long conditioning times adversely affected flotation performance. Moderate recovery of impurity minerals in the mineral and sand was also observed.

Graphical abstractCurve A is the Cu recovery for sequential AM2 addition, B is for a single dose at the start of the flotation experiment, and C is dosed with AM2 and stirred for 30 min prior to commencement; pH 10.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Recoveries of >95% in bench-scale testing achieved for a chrysocolla–quartz sample. ► Best Cu grades achieved at pH > 9. ► Long conditioning times adversely affected flotation performance. ► Moderate recovery of impurity minerals in sand was observed.