To ascertain the optimal process condition for removing water solubility sodium in Zhundong coal

three kinds of Zhundong coals

WCW

TCNY and WD

were selected as the samples to investigate the occurrence mode and mass ratio of sodium

by extraction separation step by step.Moreover

taking WCW coal as the research object

the orthogonal experiment and extreme difference analysis were carried out to investigate the effects of such parameters as temperature

time

coal particle size and agitator speed on the water soluble sodium's removal.The results indicate that

the total mass ratio of sodium in WCW

TCNY and WD coal was 2.329 5mg/g

2.235 9mg/g and 0.598 0mg/g

respectively.The sodium mainly exist in water soluble form.The order of the factors influencing water-soluble sodium's removal is:temperature

time

coal particle size

agitator speed(from strong to weak).At proper temperature

prolonging the reaction time

speeding up the agitator and reducing the coal particle size would enhance the removal rate of water soluble sodium significantely.The best working conditions of removing water-soluble sodium in the experiment is

at 70 ℃

with reaction time of 24 h

agitator speed of 200r/min and coal particle size of 38.5μm to 54μm.