Formula of efficient silicon-boron system impregnant as well as preparation and application processes of efficient silicon-boron system impregnant

Abstract

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.

Description

technical field [0001] The invention relates to the technical field of impregnating agents for carbon or graphite materials that are formed by mixing and pressing one or more of amorphous carbon raw materials such as coal, carbon powder, petroleum coke, and pitch coke, and are sintered and shaped. The invention relates to an impregnating agent for electrolytic aluminum anode carbon blocks, in particular to a high-efficiency silicon-boron system impregnating agent formula and its preparation and application process. Background technique [0002] The anode used in electrolytic aluminum is made of petroleum coke and pitch coke as the aggregate, and coal tar pitch as the binder. This kind of carbon block has a stable geometric shape after long-term roasting, so it is also called prebaked anode carbon block. In electrolytic aluminum, the prebaked anode is called the "heart" of the aluminum electrolytic cell by the industry. The consumption of aluminum per ton is 500 kg, and the p...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the above-mentioned technical problems and provide a high-efficiency silicon-boron system impregnating agent formula and its preparation and application process. Using the impregnating agent and utilizing the vacuum impregnation method, the impregnating agent forming the silicon-boron system can be effectively The tissue is completely immersed into the internal pores of the carbon anode, which overcomes the problems of too long immersion time, insufficient immersion depth, high raw material cost and unsatisfactory product purity in the prior art, and effectively treats the internal pore channels of the anode carbon block. The problem of invalid oxidation and anode carbon block slag phenomenon

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