Abstract: Experimental study on the preparation of autoclaved aerated concrete(AAC) with iron ore tailings from Dashihe iron mine of Shougang provides a technical basis for comprehensive utilization of iron ore tailings resources. The results showed that under conditions of grinding fineness of -0.08 mm 97.2%, the mixture ratio of iron ore tailings, lime, cement and gypsum at 60∶25∶10∶5, the amount of aluminum powder paste being 0.06% of the total raw materials, liquid-solid ratio of 0.6, the amount of foam stabilizer being 8% of the total volume of water, the slurry casting temperature at 50 ℃, the static curing temperature at 60 ℃ for 4 h, and steam curing pressure of 1.25 MPa at 180 ℃ for 8 h, the autoclaved aerated concrete with strength of A3.5, and density grade of B06 is obtained. X-ray diffraction analysis shows that the main phases in products are 0.9,1.1,1.4 nm tobermorite and some residual minerals in iron tailings.

Key words: Iron ore tailings, Autoclaved aerated concrete, Tobermorite