用首钢大石河铁尾矿制备蒸压加气混凝土

利用首钢大石河铁尾矿进行制备蒸压加气混凝土的试验研究，为该铁尾矿的资源化利用提供技术依据。结果表明，在铁尾矿磨矿细度为-0.08 mm占97.2%，4种原料铁尾矿、石灰、水泥、石膏的配比为60∶25∶10∶5，铝粉膏加入量为原料总量的0.06%，液固比为0.6，稳泡剂用量为总水量的8%，料浆浇注温度为50 ℃，静停养护温度和时间分别为60 ℃和4 h，蒸养压力、温度、时间分别为1.25 MPa、180 ℃、8 h的条件下，可制得强度等级为A3.5、密度等级为B06的蒸压加气混凝土。X射线衍射分析结果显示，制品中的主要物相是0.9、1.1、1.4 nm托贝莫来石及铁尾矿中的残留矿物。

Experimental Study on Preparation of Autoclaved Aerated Concrete with Iron Ore Tailings in Dashihe Iron Mine of Shougang

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.