Preparation method of anodic surface anti-oxidation protective agent for carbon-based aluminum

Abstract

The invention relates to a method for preparing an anode surface antioxidation protective agent used for carbon-base aluminum. The method includes the steps that a raw material is screened, calcined petroleum coke ball-milled powder is selected as the carbon-base raw material, and ammonium peroxydisulfate is used as a modifying agent; industrial softened water is used for dissolving the ammonium peroxydisulfate at first so that a solution can be obtained, and then the carbon-base raw material screened in advance is added into the solution; an oxidation modified reaction is carried out in an electric heating reactor with a stirring function at the temperature of 80-100 DEG C; and the industrial softened water is used for washing residual inorganic salt ions after the reaction is completed, and thus a carbon-base antioxidation protective agent product can be obtained. The method has the advantages and effects that depositions are directly coated to be attached to the surfaces of anode carbon blocks, the air reaction residual rate of anode products can be increased by 3%-4%, and anode net consumption is effectively reduced.

Description

technical field [0001] The invention relates to a preparation method of an anti-oxidation protection agent, in particular to a preparation method of an anti-oxidation protection agent for a carbon-based aluminum anode surface. The obtained anti-oxidation protection agent is used to increase the air reactivity residual rate of an aluminum anode. Reduce anode net consumption. Background technique [0002] The prebaked anode is the core part of the aluminum electrolytic cell, and its physical and chemical properties directly affect the current efficiency of the electrolytic cell and the production cost of aluminum electrolysis. Air reaction residual rate is an important physical and chemical performance index to measure the degree of air oxidation consumption of prebaked anodes in the electrolysis production process. This part of consumption is an important part of the net consumption of anodes. Reducing the consumption of air oxidation of anodes is not only beneficial to contr...

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Problems solved by technology

In recent years, with the continuous deterioration of the quality of raw petroleum coke, it is very limited to reduce the air reactivity of the anode simply by optimizing the production process, and the use of anti-oxidation protective agents to achieve high residual air reaction has attracted more and more attention, but at present The developed antioxidants are difficult to achieve large-scale application due to the following problems:

[0003] 1) Use aluminum protective coating to reduce air reactivity: This type of anti-oxidation protective agent can form a protective layer on the surface of the anode by spraying, sputtering, etc., which can reduce the contact area between the anode and the air, thereby effectively increasing the residual rate of air reaction. However, the production cost of this type of aluminum-based protective agent is relatively high, and expensive equipment is required to make the molten aluminum form a protective coating on the surface of the anode, so it is not easy to apply on a large scale

[0004] 2) Use boron salt protective agent to reduce air reactivity: this type of protective agent can be added in the form of additives in the anode production process, and the cost of production and use is relatively low. However, the added boron salt will accompany the anode in the aluminum electrolysis production process Into primary aluminum, reducing the quality of primary aluminum, so it is not suitable for actual production and application

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