Prebaked anode for aluminum electrolysis and production process thereof

A pre-baked anode and production process technology, applied in the field of carbon products, can solve problems such as high resistivity, and achieve the effects of reducing resistivity, reducing production costs, and reducing consumption

Active Publication Date: 2017-05-31
SHANDONG NANSHAN ALUMINUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the production process, the structure, porosity, particle size distribution, and powder coke content of raw petroleum coke; the control of calcination temperature, calcination heating rate, final calcination temperature, and holding time of process conditions; the optimal matching of material particle size, equipment regulation, parameters The settings and staff operating standards will have a great impact on the anode resistivity. Most of the existing technologies focus on this, either changing the formula or optimizing the process conditions in order to obtain high-quality anodes. However, using the existing The prebaked anode prepared by the technology still has a high resistivity

Method used

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  • Prebaked anode for aluminum electrolysis and production process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] An aluminum electrolytic prebaked anode, the raw materials of which include 84% of batching components and 16% of binder in weight percentage. Wherein, the batching components include 83% of calcined petroleum coke, 15% of residual electrode with ash content less than 1% and 2% of cathode milling flour by weight percentage. The calcined petroleum coke includes, by weight percentage: 18% of primary particles, 25% of secondary particles, 25% of tertiary particles, and 32% of fourth-grade powders. The binder is composed of coal tar pitch and phenolic resin.

[0038] The weighed ingredients are mixed in the first stage, the mixing time is 25min, and the mixing temperature is 98°C, then the binder is added, and the paste is prepared in the second stage. The mixing time of the second stage is 30min, and the mixing temperature is The temperature is 155°C, and the paste is subjected to vibration molding, the vibration time of vibration molding is 100s, and the pressure is 1.6k...

Embodiment 2

[0040] An aluminum electrolytic prebaked anode, the raw materials of which include 82% of batching components and 18% of binder in terms of weight percentage.

[0041] Wherein, the batching components include 84% of calcined petroleum coke, 14% of residual electrode with ash content less than 1% and 2% of cathode milling flour by weight percentage. The calcined petroleum coke includes, by weight percentage: 23% of primary particles, 20% of secondary particles, 25% of tertiary particles, and 32% of fourth-grade powders. The binder is composed of coal tar pitch, epoxy resin and phenolic resin.

[0042] The weighed ingredients are mixed in the first stage, the mixing time is 22min, and the mixing temperature is 95°C, then the binder is added, and the paste is prepared in the second stage. The mixing time of the second stage is 35min, and the mixing temperature is The temperature is 150°C, and the paste is subjected to vibration molding, the vibration time of vibration molding is...

Embodiment 3

[0044] An aluminum electrolytic prebaked anode, the raw materials of which include 86% of batching components and 14% of binder in terms of weight percentage. Wherein, the batching components include 80% of calcined petroleum coke, 16% of residual electrode with ash content less than 1% and 4% of cathode milling flour by weight percentage. The calcined petroleum coke includes, by weight percentage: 18% of primary particles, 20% of secondary particles, 30% of tertiary particles, and 32% of fourth-grade powders. The binder is composed of coal tar pitch and furfural resin.

[0045] First, put the calcined petroleum coke and the residual electrode in a container for stirring, and continuously add cathode milling flour during the stirring process. Among them, the cathode milling flour is placed separately in the silo, weighed and directly poured into the screw conveyor, and the cathode milling flour is continuously added to the kneading pot by the screw conveyor for primary mixing...

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Abstract

The invention provides a prebaked anode for aluminum electrolysis and a production process thereof, which belong to the field of carbon products. The prebaked anode for aluminum electrolysis is prepared from the following raw materials according to weight percent: 82 to 86% of preparation components and 14% to 18% of adhesives, wherein the preparation components include 80% to 84% of calcined petroleum coke, 14% to 16% of anode scraps and 2% to 4% of cathode milling flour according to weight percent. The production process comprises the steps of preparing the raw materials of the prebaked anode for aluminum electrolysis, mixing the preparation components at the first stage, adding the adhesives, mixing at the second stage so as to prepare thickeners, performing vibration forming on the thickeners so as to obtain anode green bodies, performing water-cooling curing on the anode green bodies, and then roasting and cooling. According to the production process, the resistivity of the prebaked anode for aluminum electrolysis can be reduced, and the conductivity of a carbon anode can be increased, so that a prebaked anode product with low resistivity is obtained, and the consumption of electrolysis for producing electric energy is reduced.

Description

technical field [0001] The invention relates to the field of carbon products, in particular to an aluminum electrolytic prebaked anode and a production process thereof. Background technique [0002] The prebaked anode plays a very important role in the production process of the aluminum electrolytic cell. It acts as a conductor to introduce direct current into the electrolytic cell and participates in the anode reaction process as the anode material of the electrolytic cell. Efficiency, power consumption, primary aluminum grade and other economic and technical indicators are closely related, especially the resistivity index, which is an important indicator of the quality of the anode. [0003] The prebaked anode carbon block is generally a cuboid, and the current density passing through it when the electrolyzer is energized is generally 0.7A / cm 2 ~0.8A / cm 2 , plus the guide rod and contact resistance, the voltage drop on the carbon anode consumed by aluminum electrolysis i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/12
CPCC25C3/125
Inventor 姜海涛汤昌廷周平谢言政王勇阎昭辉张启东
Owner SHANDONG NANSHAN ALUMINUM
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