Grinding and a flash flotation cell are frequently installed to recover fast floatability coarse particles avoiding their regrinding. However, the ore textural characteristics, such as grain size, change during mine operation and consequently the recovery of valuable particles in the flash flotation cell decreases. This article proposes and validates an interesting method of solving the problem of low gold recovery, making relevant and well thought out changes in a grinding and flash flotation circuit. This was done by optical ore characterisation (Leica DM2700 P microscope using 20X and 40X lens), mathematical modelling, and steady state process simulation (evaluating the original circuit (simulation I) and two proposed circuits (simulation II, and III)). The mineralogical characterisation indicates that, liberated gold (Au), electrum (Au-Ag), and acanthite (Ag₂S) particles of less than 100 µm were the desired particles in the flash concentrate. Additionally, true flotation was identified as the predominant mechanism in gold and silver recovery, but mathematical model suggests that a small fraction of fine particles with gold could be recovered by entrainment. Both analyses led to the proposed installation of a re-grinding mill with recirculation to a flash cell (simulation III). After its commissioning, gold recovery in the flash cell increased 27.0%, reaching a maximum of 48.3%. This represents a clear improvement in gold recovery in a single stage. A significant increase in the global gold recovery was also observed (from 78.9% to 90.6%).

经常安装研磨和闪蒸浮选槽以回收快速可浮性粗颗粒，避免重新研磨。然而，矿石结构特征（例如粒度）在矿山运行过程中会发生变化，因此闪蒸浮选槽中有价值颗粒的回收率会降低。本文提出并验证了一种解决金回收率低问题的有趣方法，对研磨和闪蒸浮选回路进行了相关且深思熟虑的更改。这是通过光学矿石表征（使用 20X 和 40X 镜头的 Leica DM2700 P 显微镜）、数学建模和稳态过程模拟（评估原始电路（模拟 I）和两个建议的电路（模拟 II 和 III））完成的。矿物学表征表明，游离金 (Au)、金银合金 (Au-Ag)、₂ S) 小于 100 µm 的颗粒是闪蒸浓缩物中所需的颗粒。此外，真正的浮选被确定为金银回收的主要机制，但数学模型表明，一小部分含金的细颗粒可以通过夹带回收。两项分析都导致建议安装再研磨机，再循环到闪蒸槽（模拟 III）。投产后，闪蒸槽中的金回收率提高了 27.0%，最高可达 48.3%。这代表了单一阶段黄金回收率的明显改善。还观察到全球黄金回收率显着增加（从 78.9% 到 90.6%）。