STUDY ON THE FLOTATION MECHANISM OF WEATHERED COPPER PORPHYRY ORES WITH THE APPLICATION OF AN ACTIVATOR REAGENT
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During laboratory testing, the effect of varying dosages of the NaHS (sodium hydrosulfide) reagent was studied to evaluate the formation of an ultra-thin artificial covellite-like (CuS) film on the surface of hydrophilic oxidized minerals via an anion exchange mechanism. Experimental results indicated that the optimum NaHS consumption rate is 350 g/t. At this operational point, the maximum concentrate grade reached 20.52% Cu with a corresponding metal recovery rate of 71.52%, while the copper content in the tailings dropped to 0.036%. Conversely, increasing the reagent dosage to 600 g/t led to a sharp decline in recovery down to 49.22% due to an excess of free hydrosulfide ions in the pulp, which blocked the adsorption of the xanthate collector (depression effect). Based on these findings, the scientific necessity of implementing automated CPS (Controlled Potential Sulphidisation) technology in industrial settings was fully justified to mitigate the adverse depression effects and dynamically regulate the pulp's electrochemical potential (Eh).
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