Upgrading of Vang Danh Coal Fines Using Reflux Flotation Cell

In the world, the coal fines usually are upgraded in flotation columns (Jameson, Pneufloat, Microcell cells, etc.). Reflux flotation cell is a novel type of flotation column that uses a system of inclined channels to enhance bubble - liquid segregation in flotation. Additionally, in this type of device, a unique froth washing mechanism with pressurized water is used to ameliorate the quality of clean coal. This type of device has a simple structure, high capacity, and allows the receiving of high-quality clean coal. This paper presents the test results of coal fines samples −0.3 mm from Vang Danh underground coal mine (in Quang Ninh, Vietnam) by flotation in a laboratory Reflux flotation cell. The test results show that combined clean coal can be received with the ash content less than 15% and the combustible recovery of more than 80%. This cleaned coal meets the quality standard of 3B fine coals (ash content of 14–16%). The flotation tailing with the ash content of more than 70% can be rejected.