Abstract：The ash fusion properties of high calcium bituminous coal and low calcium anthracite and their blends were investigated. The ash fusion characteristic temperature was obtained by using ash melting point tester. And the phase transformation in melting process of samples′ash was calculated by Equilib module and Phase Diagram module of FactSage thermodynamics software. The results showed that the ash fusion point of the coal was closely related to the composition of coal, acidic substances in coal ash can increase the melting characteristics, while the alkaline materials can reduce the melting characteristics. The melting process obtained by FactSage showed that the difference in melting characteristics between bituminous coal and anthracite coal ash was caused by a change in the mass content of mullite and anorthite at above 1 000 ℃. For the blend ash, the mullite content in the ore composition increased, the amount of anorthite decreased at 1 000 ℃ with the increase of the proportion of low calcium anthracite, resulting in the increase of melting point of blend coal ash.
2018, Vol. 28 
