Abstract: With common cement as the gelling agent, iron tailing from Lingxiang in Huangshi as the raw material to prepare the lightweight heat insulation walling material, the effect of lightweight aggregate of expanded perlite, iron tailings, the dosage of alkali activator, the water-cement ratio on the compressive strength, bulk density, thermal conductivity are studied. The results show that the alkaline activator in the test has a significant activation on the activity of iron ore tailings, which can increase the dosage proportion of iron tailings and reduce the amount of cement. When the mass ratio of cement, iron tailings, activator and expanded perlite is 1∶2.5∶0.25∶0.63 and the water-cement ratio is 0.8, the test materials own compressive strength＞5 MPa, bulk density <900 kg/m3, and thermal conductivity of <0.231 W/(m·k) at 28 d, which can meet the performance requirements of lightweight insulation walling material.

Key words: Iron tailing, Alkaline activator, Lightweight heat insulation, Compressive strength, Bulk density, Thermal conductivity