This project is based on red mud as the main raw material, using lightweight aggregate and refractory fine powder compounding ingredients, optimizing the selection of q = 0.24 six-level particle size distribution program, developed a new type of lightweight thermal insulation material, suitable for doing Aluminum electrolytic tank bottom insulation material. The research content, technical characteristics and technical and economic advantages are as follows: 1, seamless, good insulation and integrity. The original clay heat-insulated bricks were laid in two layers and the upper and lower layers were staggered and stitched. Generally, 1 to 2 mm brick seams were left, and a large amount of industrial Al2O3 powder was needed to make the joints. The new lightweight bulk insulation material used was amorphous. Refractory material, good integrity after construction, seamless, is conducive to ensure the bottom of the electrolysis cell during the operation of the insulation effect, while saving a lot of industrial Al2O3 powder. The thermal conductivity of the new bulk insulation material is ?0.172w/m·k, and therefore has a better insulation effect than the original insulation material structure. 2, the construction is convenient. From the perspective of material properties, the new light bulk insulation material is very similar to the dry impregnation material, so that the same construction technology and equipment can be used, eliminating the need for complicated operation training for workers. 3, is conducive to the stable and efficient operation of the electrolyzer. From the perspective of improving the bottom structure of the rear tank, the new type of bulk insulation material and dry impervious material supporting each other complement each other, which is beneficial to the bottom insulation, but also help prevent the electrolyte penetration, while the light bulk insulation material and dry impervious material It also has certain plasticity, which can effectively prevent the bottom of the tank from bulging, reduce the deformation of the tank shell, and prolong the operating life of the electrolytic tank. The new type of lightweight bulk insulation material for aluminum reduction cells is compared with the insulation layer structure of the original insulation brick and calcium silicate board. It has good performance in terms of overall structure, construction performance and thermal insulation effect, and can significantly reduce the cost of thermal insulation materials. At the same time, it can effectively use the red mud residue of Shandong Branch to produce quality and cheap materials, replacing the purchased insulation materials. For enterprises to reduce costs and increase efficiency, it has obvious technical and economic effects. Shanlv Aluminum Plant currently has a total of 196 prebaked electrolyzers, which can save 8.412 million yuan after the overhaul is completed.