Experimental study on aerated concrete with Lingqiu iron ore tailings

For comprehensive utilization of iron ore tailings,the aerated concrete was successfully prepared by Shanxi Lingqiu low-silica iron ore tailings as the main raw material and aluminum powder as gas evolution agent,which is in line with GB/T11968—2006 of the A3.5 B06-class.In the case of the maximize use of iron ore tailings,the optimized plan of aerated concrete production was that the iron ore tailings grinding time was 25 min,silica sand grinding time was 30 min,burdening mass ratio of iron ore tailings,silica sand,lime cement and gypsum was 40∶ 20∶ 24∶ 10∶ 6.The major mineral phases in the aerated concrete product were tobermorite with residue quartz and anhydrite.SEM and EDS results showed that the finished product to form bense microstructure by C-S-H gel and tobermorite,it was important reason that aerated concrete obtained high strength.