Arsenic volatilization characteristics during co-combustion of high arsenic lignite and low arsenic bituminous coal were carried out on an isothermal experiment system from 600℃ to 1100℃ at different blending ratios (3:1

1:1

1:3). The results showed that with increasing temperature

the arsenic volatilization in single and mixed coals increased gradually. The volatilization ratios of arsenic in mixed coals at various blending ratios were between two single coals

while they were larger than the weighted average values. Combined with isothermal coal combustion curves

it was found that high volatile content in lignite affected the char combustion properties in blended coals

which in turn promoted the volatilization of arsenic. Considering the effects of temperature

coal blending and the difference of coal rank

the arsenic volatilization model during mixed coal combustion was proposed. The model results fit the experimental curves well

which provided a reference for the prediction of arsenic volatility characteristics of blended coals.