Preparation of ultra-low ash coal from non-stick coal by using high-speed shear-selective agglomeration flotation

Coal contains a large amount of ash, resulting in coal combustion of nitrogen oxides, sulfur dioxide and other heavy metal particles have a serious impact on the ecological environment. The preparation of ultra-low ash coal has become a major means to improve the utilization rate of coal resources. Therefore, this study takes a non-stick coal as the research object. The optimum flotation process and pharmaceutical regime were explored by high-speed shear hydrophobic agglomerate flotation. The results demonstrate that non-stick coal by high-speed shear hydrophobic agglomerate flotation can reduce the ash content of the original coal by 10.5–1.49%, with a yield of up to 54.93%. In addition, the experiment also found that high-speed stirring can overcome the energy barrier of particle interaction, making the hydrophobic particles more dense, which is more conducive to effectively separating clean coal and inorganic minerals. This study provides an effective way for high value-added utilization of coal, and provides reference for realizing the fine and clean utilization of coal resources.