The dominant challenge of current copper beneficiation plants is the low recoverability of oxide copper-bearing minerals associated with sulfide type ones. Furthermore, applying commonly used conventional methodologies does not allow the interactional effects of critical parameters in the flotation processes to be investigated, which is mostly overlooked in the literature. To tackle this issue, the present paper aimed at characterizing the behavior of five key effective factors and their interactions in a sulfidized copper ore. In this context, dosage of collector (sodium di-ethydithiophosphate, 60–100 g/t), depressant (sodium silicate, 80–120 g/t) and frother (methyl isobutyl carbinol (MIBC), 6–10 g/t), pulp pH (7–11) and agitation rate (900–1300 rpm) were examined and statistically analyzed using response surface methodology. Flotation experiments were conducted in a Denver type agitated flotation cell at the rougher stage. The experimental results showed that increasing the pH (from 8 to 10) at low agitation rate (1000 rpm) enhanced the recovery from 80.36% to 85.22%, while at high agitation rate (1200 rpm), a slight declination occurred in the recovery. Meanwhile, increasing the collector dosage at a lower frother value (7 g/t), caused a reduction of about 4.44% in copper recovery owing to the interactions between factors, whereas at a higher frother level (9 g/t), the recovery was almost unchanged. The optimization process was also performed using the goal function approach, and maximum copper recovery of 92.75% was obtained using ~70 g/t collector, 110 g/t depressant, 7 g/t frother, pulp pH of 10 and 1000 rpm agitation rate.

中文翻译：

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硫化混合铜矿浮选性能的参数优化

当前的铜选矿厂面临的主要挑战是与硫化物类矿物相关的含氧化物铜矿物质的可回收性低。此外，应用常用的常规方法不能研究浮选过程中关键参数的相互作用，这在文献中通常被忽略。为了解决这个问题，本文旨在表征五个主要有效因素的行为及其在硫化铜矿石中的相互作用。在这种情况下，收集剂的用量（二乙基二硫代磷酸钠，60-100 g / t），抑制剂（硅酸钠，80-120 g / t）和起泡剂（甲基异丁基甲醇（MIBC），6-10 g / t） ，使用响应面方法对纸浆的pH值（7-11）和搅拌速度（900-1300 rpm）进行了检查和统计分析。在较粗的阶段在丹佛式搅拌浮选池中进行浮选实验。实验结果表明，在低搅拌速率（1000 rpm）下将pH从8增加到10可以将回收率从80.36％提高到85.22％，而在高搅拌速率（1200 rpm）下，回收率会有轻微的偏斜。同时，由于起泡剂之间的相互作用，在较低的起泡值（7 g / t）下增加捕收剂的用量会导致铜回收率下降约4.44％，而在较高的起泡水平（9 g / t）时，回收率会降低几乎没有变化。还使用目标函数法进行了优化过程，使用约70 g / t捕收剂，110 g / t抑制剂，7 g / t起泡剂，pH为10的纸浆和1000 rpm的搅拌速度可获得最大的铜回收率达92.75％。 。