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This paper studies the formation dynamics of calcium barium sulphoaluminate mineral with the composition of 2.75CaO·1.25BaO·3Al2O3·SO3 (C2.75B1.25A3(S) ).The results suggest that,under the condition of the experimental preparation process,the formation process of C2.75B1.25A3(S) mineral is controlled by diffusion mechanism in the temperature range of 1100-1380℃ and the formation dynamics fits nicely with D4=1-2α/3-(1-α)2/3=Kt.