The range analysis of the strength of autoclaved concrete was carried on after the orthogonal experiment, and the optimum ratio was obtained. Then the mechanical properties and frost resistance of autoclaved concrete were studied with different lime contents. The experimental results show that the condition of steam curing improves the activity of iron ore tailings; under steam curing, lime content has a significant influence on the compressive strength of the autoclaved concrete prepared with iron tailings, with the increase of lime content, their strength decreases after the first increases, and the sample of 60% lime content gets the highest strength; lime content also has a significant influence on the frost resistance of the autoclaved concrete prepared with iron tailings, the mass and strength loss of concrete decreases after the first increases with the increase of lime content, and the sample with 60% lime content shows the worst frost resistance, but it has the best frost resistance with 50% lime content; In steam curing condition, the main hydration products of iron tailings autoclaved concrete with different lime contents are tobermorite, C-S-H and xonotlite, but their contents and the degrees of crystalline are different. The tobermorite with better degree of crystallization interspersed in the network structure of C-S-H appropriately in the sample of 50% lime content, and the sample obtained the best frost resistance.
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