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

A technology of impregnating agent and silicon boron, which is applied in the field of impregnating agent for electrolytic aluminum anode carbon block, high-efficiency silicon boron system impregnating agent formula and its preparation and application process, which can solve the problem of unsatisfactory product purity, insufficient impregnation depth and long impregnation time to avoid inconsistent reaction rates, high dispersion stability, and easy access to raw materials

Pending Publication Date: 2022-02-08
湖南国发控股有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This embodiment provides a high-efficiency silicon-boron system impregnating agent, which is a solution prepared by borax, sodium silicate and water. In terms of mass fraction, the boron content in the solution is 2%, the silicon content is 2%, and the balance is water.

[0031] The impregnating agent in this embodiment is prepared and used immediately when the electrolytic aluminum anode is replaced, and the specific preparation and application method includes the following steps:

[0032] A. Weigh borax and sodium silicate according to the proportion of the impregnating agent components, first put the two into a stirring container, add water to dissolve, and mix evenly at a stirring speed of 80rpm;

[0033] B. Record the impregnating agent configured in the previous step and store it for future use;

[0034] C. Place the prebaked anode carbon block in the impregnation tank, and carry out vacuum treatment, so that the vacuum degree in the tank is 300pa;

[0035] D. I...

Embodiment 2

[0040] The difference between this example and Example 1 is that in the high-efficiency silicon-boron system impregnating agent in this example, the boron content is 2%, the silicon content is 4%, and the rest is water. The steps of the specific preparation and application methods are the same as those in the examples.

[0041] Air reactivity test was performed on the anode after step E in this embodiment, and the residual rate was 97.6%, the dust rate was 0.8%, and the loss rate was 1.6%.

Embodiment 3

[0043] The difference between this example and Example 1 is that in the high-efficiency silicon-boron system impregnating agent in this example, the boron content is 2%, the silicon content is 4%, and the rest is water. The steps of the specific preparation and application methods are the same as those in the examples.

[0044] Air reactivity test was performed on the anode after step E in this embodiment, and the residual rate was 98.5%, the dust rate was 0.4%, and the loss rate was 1.1%.

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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...

Claims

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Application Information

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IPC IPC(8): C25C3/12C04B41/85
CPCC25C3/125C04B41/5022C04B41/5024C04B41/85C04B41/009C04B35/52C04B41/5006C04B41/4539
Inventor 黄强卢丰玉黄治齐
Owner 湖南国发控股有限公司
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