Study on Super Clean Coal Preparation Technique with 1 /3 Coking Coal from Xiaokang Village by Heat Extraction

In order to obtain the optimal technique conditions for preparing the super clean coal, taking industry washing oil as solvent, super clean coal was prepar ed by heat extraction with 1 /3 coking coal from Xiaokang Village. The initial pressure, residence time, coal particle size, cold- hot filtering method, volume ratio of solve nts and other factors were investigated on the properties of coal heat extraction and the industry washing oil recycling times was studied. The results showed that in an inert environment, extraction and filtration temperature was 380。C, coal particle size was 0. 177 mm, residence time was 10 min, the ratio of solvent volume and coal m ass was 6: 1 ( mL/ g)，the super clean coal extraction yield was 66. 8%. The industry washing oil after recovery still had excellent heat extraction performance. After「 ecycled four times, the super clean coal extraction yield was still bigger than 60%.