Abstract: Several kinds of sludge were used to prepare the thermal insulation wall materials, and the performances between non anaerobic digested sludge with anaerobic digested sludge in prepare the thermal insulation wall materials was compared. Firstly, the physical and chemical properties of raw materials were studied. The results show that Chongqing shale is suitable for the preparation of sintering block as raw material, and the optimum sintering temperature is 950 ℃. Sludge was characterized with high moisture content, high heat and high fever loss. Secondly, 1 # sludge and 4 # sludge were selected out to mix with shale, because of the best overall performance. The samples were sintered, and measured their molding moisture content, drying shrinkage rate, compressive strength ect. . The results show that the comprehensive performances of 4# sludge is higher than that of 1# sludge. When the non anaerobic digested sludge content is 15%, firing temperature is 950 ℃, the compressive strength grade of the samples reached MU7. 5, thermal conductivity were 0. 30001 W/(M·K), decreasing by 33. 33% than pure shale. When the anaerobic digested sludge content is 20%, firing temperature is 950 ℃, the compressive strength grade of the samples reached MU7. 5, thermal conductivity is 0. 2600 W/(M·K), decreasing by 42. 22% than pure shale. Analysis shows that, in the case of ensuring the strength to be the same, anaerobic digested sludge could effectively improve the content of sludge in making sludge bricks.

Key words: sintering insulating material;anaerobic digestion sludge;non-anaerobic digestion sludge;compressive strength;thermal conductivity