ABSTRACT

Due to the short life of nanobubbles in the pulp, their use in mineral processing, especially in fine grains, is rare. Hence, the use of sustainable nanobubbles with a long lifetime can lead to new results. In addition to the presence of micro-nano bubbles, the ultrasonic emission factor can also have a positive effect on flotation performance. The simultaneous effect of these two factors has not been considered in previous studies. In this study, the stable micro-nano bubbles produced by the hydrodynamic cavitation mechanism were used in the pulp and simultaneously the ultrasonic waves were irradiated. Under these conditions, a wide range of bubbles ranging from 80 nm to 1 mm was generated which caused the flotation of the fine to coarse size particles. Simultaneous use of these two factors showed that the yield of coarse (−850 + 420 µm), medium (−420 + 105 µm) and fine (−105 µm) particles improved by more than 10%, 10%, and 30%, respectively. Combustibles recovery in variable feed ash along with the ash selectivity index were enhanced. In addition, consumption of the collector was reduced up to 90%, while the concentration required for the frother agent was reduced to approximately a quarter.

摘要

由于纸浆中纳米气泡的寿命很短，它们在矿物加工中的应用，特别是在细颗粒中的应用很少。因此，使用具有长寿命的可持续纳米气泡可以带来新的结果。除了微纳米气泡的存在，超声波发射因子也可以对浮选性能产生积极影响。以前的研究没有考虑这两个因素的同时影响。在这项研究中，通过水动力空化机制产生的稳定的微纳米气泡被用于纸浆中，同时照射超声波。在这些条件下，产生了范围从 80 nm 到 1 mm 的大范围气泡，导致细颗粒到粗颗粒的浮选。同时使用这两个因素表明，粗（-850 + 420 µm）的产量，中等 (-420 + 105 µm) 和细 (-105 µm) 颗粒分别提高了 10%、10% 和 30% 以上。可变进料灰中的可燃物回收率以及灰分选择性指数均得到提高。此外，捕收剂的消耗量减少了高达 90%，而起泡剂所需的浓度减少到大约四分之一。