Abstract: Manganese tailings slag is rich in elements such as silicon and aluminum， which could be used as a raw material for preparing geopolymers. In order to investigate the possibility of combining manganese tailings slag with straw stalk as an insulation material， manganese tailings slag was used to replace some metakaolin for preparing geopolymer. After combining with straw stalk， kaolin/manganese tailings slag and straw composite insulation material was prepared. The effect of diffirent curing time under natural conditions and adding different proportions of straw on the mechanical properties and thermal conductivity of composite thermal insulation materials were studied. The results showed that when the addition of straw stalk powder was 3%， the compressive strength of the composite insulation material reaches 71.8 MPa after 28 days of curing with the flexural strength of 9.8 MPa， the thermal conductivity of 0.065 W/(m·K) and the density of 265 kg/m3. The main indicators meet the requirements of national standard Constrcution Industry Standard (JG 158-2004). The high temperature resistance tests of the composite insulation material was conducted. The results showed that the polymer has a certain protective effect on straw when the calcination temperature was lower than 200~500 ℃. The research results of the thesis have a certain promotion effect on improving the comprehensive utilization of manganese tailings and straw.

Key words: kaolin, manganese tailings slag, straw, composite insulation material, mechanical performance