EVALUATION OF THE EFFECT OF G-FACTOR AND CYCLE TIME ON GOLD AND SILVER RECOVERY FROM COPPER-PORPHYRY ORE USING A CENTRIFUGAL CONCENTRATOR BASED ON A FACTORIAL EXPERIMENT
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The work examines the operating factors of gold and silver recovery from the copper-porphyry ore on a centrifugal concentrator. The ore is low-grade, containing 0.38 g/t Au; the bulk of the metal (69.12%) occurs as 2–8 µm particles. The tests were run on a laboratory Knelson KC-MD3 unit with the ore ground to 80% passing 0.074 mm. The centrifugal force (G) was varied from 30 to 150 ×g and the cycle time (t) from 10 to 50 min. Single-factor tests showed a distinct maximum of recovery with respect to G (54.0% at G ≈ 90 ×g) and a plateau with respect to cycle time beyond ≈30 min. A size-by-size analysis established that the force has almost no effect on coarse (+74 µm) particles, whereas in the 2–8 µm class recovery varies from 28 to 38%. A 2² full factorial design with a triplicated centre point, processed by analysis of variance, yielded a linear effect of G of +3.25%, of cycle time +2.75%, an interaction of −1.25% and a curvature of +5.18% (p < 0.001). This proves the non-linearity of the response surface and the location of the optimum inside the experimental region (≈90 ×g; ≈30 min).
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