No.14 Performance of DME method on extraction of frozen brown coal mined at frigid regions

Abstract

The liquefied DME (dimethy ether) was used to dewater the frozen brown coal under a designed experimental condition at -20 ℃. By using this method, 98.1 wt. % of the initial water was removed from the frozen brown coal sample. The water forms in the tested brown coal sample at low temperature were studied using differential scanning calorimetry (DSC). It was found that the water existed in both ice and non-freezing forms at the temperature under frozen point indicating that both forms of water can be removed by DME at frigid condition.