Abstract:

To investigate the deashing effect of emulsified diesel oil to Wuhai fat coal, the emulsified diesel oil and diesel oil were employed as collector to do the lab flotation experiments, and the combustible material recovery and flotation perfectness were used as evaluation index. The results showed that the emulsified diesel oil had a better selectivity, at the case of same combustible material recovery, the ash content was lower using emulsified diesel oil as collector than using diesel oil, and the best collector dosage 0.8kg/t was determined, which can save 73% oil. The classification flotation was adopted to investigate the deashing effect of different size fraction coal sample. The mechanism of deashing of emulsified diesel oil was discussed through the contrast the hydrophobicity and Zeta potential of coal sample before and after agent acted.

Key words: emulsified diesel oil, flotation, deashing, hydrophobicity, coal slime