Abstract: The influences of the Shouwang Fen low-silicon copper tailings and the fineness of high-silicon silica sand to the properties of the mobility，stability，bone-dry strength and bone-dry ratio strength of the aerated concrete slurry are tested in the experiments.It is obtained that the optimum grading fineness of the aerated concrete with the low silicon copper mine tailings and silica sand as silicon materials are copper tailings grinding for 20 min（+0.074 mm 1.1%)，silica sand grinding for 30 min（+0.074 mm 5.2%).

Key words: Low silicon copper tailings, Aerated concrete, Optimum grading fineness