The dry impermeable refractory uses clay clinker as refractory aggregate, third-grade bauxite clinker as refractory powder, adding superfine powder, using high-quality cement as binder, adding dispersant and siliceous or feldspar anti-seepage agent. Impermeable material, also known as chemical baffle, is not impervious in itself, but can react chemically with the electrolyte components entering it, forming a withered baffle on the spot, which can prevent the electrolyte from continuously penetrating downwards; That is, an impermeable solid layer or glassy layer is formed after reaction with fluoride. Compared with refractory bricks, dry anti-seepage materials have good anti-seepage performance and heat preservation performance, so the test tank runs smoothly after being put into production, the hearth is regular, the four corners are not extended, the anode works normally, the electrolyte boils strongly, and the anti-interference ability is strong. Dry impervious material is laid at the bottom of aluminum electrolytic cell, and forms a nepheline layer at high temperature, which prevents Na+ and NaF steam and aluminum liquid from penetrating downwards, and has low thermal conductivity and obvious energy saving effect; Dry impervious materials are directly laid and compacted by bulk materials in furnace building, instead of traditional laying of alumina and laying of refractory brick layers, which saves time and labor by 70% and has excellent integral lining function. By selecting dry impervious materials and using traditional materials to build furnaces, the service life of electrolyzers can be extended by more than one year, and the current efficiency of electrolyzers can be advanced by more than 0.5% in the later working period. The principle is: because the electrolyte penetration is inhibited, the insulation layer is not damaged, and the insulation function does not change during the working period of the electrolytic cell (special working later period), which can ensure the relatively stable cell voltage, reasonable heat distribution and improved efficiency. Application: aluminum electrolytic cell, various melting and casting furnaces. Tech data: ItemsDry impermeable Bulk density(Min, g/cm鲁)1.8-2. 0 Al2O3+ Sio2 (Min, %)80 Refractoriness (鈩?1650-1690 Thermal conductivity(Max,350卤25鈩? W/m.K)0.5Bulk Impermeable Refractory website:http://www.ucrefractory.com/monolithic-refractories/impermeable-refractory/