The invention discloses a
silicon-
boron system impregnant, which is a solution prepared by blending 0.001%-10% of a
silicon-based substance, 0.001%-10% of a
boron-based substance, less than or equal to 10% of an auxiliary agent and 80%-99% of water according to a certain proportion. The auxiliary agent is a
thickening agent, and the use amount of the
thickening agent is adjusted according to actual requirements, so that the
viscosity of the impregnant is controlled to be 0.01-10 Pa.s. The impregnant is organized and actively enters pores in the
anode in a mode of first negative pressure and then
positive pressure, is dried at a low temperature, and forms a compact
silicon-
boron anti-oxidation film on the inner
cavity wall of an
anode carbon block in a high-temperature environment during
electrolysis, and has certain
bonding strength, the silicon-based substance in the impregnant enhances the
oxidation resistance of the carbon
anode by improving the adhesion of a
boron oxide film and the carbon anode, invalid oxidation in pore channels of the anode carbon block can be effectively prevented, the air reactivity is reduced, and a silicon-boron-carbon
system forms a stable net-shaped structure in pores of the anode carbon block, so that
slag falling is effectively prevented.