In order to make full use of the low calorific value oil shale in Changji area of Xinjiang

the oil shale and Zhundong coal were co-fired

and the combustion characteristics

ash fusion point and sodium volatilization were fully studied by means of thermogravimetric analyzer(TG)

ash melting point tester and inductively coupled plasma emission spectrometer(ICP-OES). The experimental results show that

with the decrease of mass ratio of basic oxides to acidic oxides(B/A) in the ash

namely with the increase of blending ratio of oil shale

the ignition temperature and burnout temperature of the mixed fuel increased gradually

so the flammability and combustion characteristics decreased.With the decrease of B/A

the ash melting point of the mixed fuel decreased at first and then rose

when the B/A reached 1.67

the proportion of each component in the ash was located in the low temperature co-melting region

which led to a decrease in ash melting point. With the decrease of B/A

the volatilization of sodium element decreased rapidly and then slowly rose. When the combustion temperature was850 ℃ and the B/A was 1.44

the sodium volatilization reached the minimal value. The oil shale can fix the sodium element into the ash

which effectively suppressed the volatilization of Na. The result provides a new way for utilization of Changji oil shale.