The nonreactive mold fluxes CaO-Al2O3-B2O3 ternary slag system was simulated by mo-lecular dynamics method,and the network structure model was constructed.The effect of B2O3 content on the microstructure of slag was studied.The results show that Boron has the strongest binding ability with oxygen in the network,and can simplify the network and balance excess charges.Aluminum mainly exists in the form of tetra-coordination in the melt,and also exists Al-O structure of high-coordination.When the content of B2O3 is 5％,the content of[AlO4]in the slag is the highest.As the content of B2O3 increases,the degree of polymerization of the slag network structure and the com-plex Al-O structure decrease,and the orderliness of the microstructure of the slag is increased.
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