The cyclonic–static microbubble flotation column (FCSMC) has been proven to be a promising technique for recovering fine-grained minerals. However, low recovery of coarse coal particles by the FCSMC has been reported due to utilization of a single mineralization step. In the present study, a novel modified flotation unit has been added to the conventional FCSMC to improve the recovery of coarse coal particles. The design aspects and operating procedures of the proposed modified cyclonic microbubble flotation column (MCMFC) were studied and the results were compared with the conventional FCSMC. Some data on the applications of MCMFC in industrial floatation processes have also been discussed. The results showed that MCMFC provided higher recovery of coarse coal particles compared to those by FCSMC. Specifically, for −500 + 250 μm coarse particles, the yield by MCMFC was 22.29% higher than that by FCSMC. Both concentrate yield and concentrate ash were found to be significantly affected by the inclusion of the modified flotation unit.

旋流静态微泡浮选塔（FCSMC）已被证明是一种回收细粒矿物的有前途的技术。然而，由于利用了单个矿化步骤，据报道FCSMC对粗煤颗粒的回收率较低。在本研究中，新型的改进型浮选机已被添加到常规FCSMC中，以提高粗煤颗粒的回收率。研究了改进型旋流微泡浮选塔（MCMFC）的设计方面和操作程序，并将结果与​​常规FCSMC进行了比较。还讨论了有关MCMFC在工业浮选过程中应用的一些数据。结果表明，与FCSMC相比，MCMFC提供了更高的粗煤颗粒回收率。具体来说，对于-500 + 250μm的粗颗粒，MCMFC的收率比FCSMC高22.29％。发现精矿产量和精矿灰分均受改性浮选装置的影响。