Abstract:

The ash of the second stage floatation clean coal is usually higher than requirement when treating high ash refractory coal slime with coal slime two-stage floatation, two-stage dewatering process, thus lump coal has to be separate at low ash level to meet the total ash requirement. To solve this problem, the author put forward the idea to use cyclone micro bubble flotation column as the second stage equipment and conduct relevance experiments. The result demonstrates that qualified clean coal can be obtained .Moreover, when compared with conventional floatation cells, clean coal ash was 3.44% lower while the tail ash and flotation perfect index was higher (1.67% and 6.54% respectively) at similar clean coal productivity, clean coal productivity is 10.27% higher, tail ash 6.91% and flotation perfect index 5.14% higher at the same clean coal ash level.

Key words: High ash refractory coal slime, Two-stage floatation, flotation column, Experiment