Conduct sieve analysis and flotability experiment to investigate the experimental slime properties. The results show that,the slime is easy to degrade and difficult to wash. Large fine slime lead to high ash of clean coal. Prepare the collector with waste cooking oil and analyse its mechanism of action,conduct laboratory slime flotation test. The results show that,when the ash of clean coal is basically the same,the collecting effects of biodiesel is inferior to diesel and kerosene. When the blending ratio ...