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Prebaked anode and preparation method and application thereof

A prebaked anode and roasting technology, which is applied in the field of electrolysis, can solve the problems of prebaked anode being easily oxidized and insufficient mechanical strength, and achieve the effect of increasing the residual electrode rate and wide adaptability

Active Publication Date: 2021-05-28
山西沁新能源集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide prebaked anode and its preparation method and application

Method used

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  • Prebaked anode and preparation method and application thereof
  • Prebaked anode and preparation method and application thereof
  • Prebaked anode and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Modify the asphalt according to the ratio in Table 2, the modification temperature is 175°C, shear 20min at a speed of 2955r / min, and stir for 2h to obtain modified asphalt;

[0044] (2) Crush the petroleum coke to a particle size of 1-3mm, mix the crushed petroleum coke and modified pitch at a weight ratio of 8:1, and then put the mixed raw materials into an electric kneader with a kneading temperature of 120°C. Vibrate for 5 minutes;

[0045] (3) The kneaded material is roasted in a tunnel kiln, and the temperature is raised from an initial temperature of 20 °C to 1100 °C at a rate of 0.5 °C / min, and the prebaked electrode is obtained after heat preservation and roasting for 80 hours.

Embodiment 2

[0047] (1) Modify the asphalt according to the ratio in Table 2, the modification temperature is 165°C, the shearing time is 15min at 2955r / min, and the mixture is stirred for 3h to obtain the modified asphalt;

[0048](2) Crush the petroleum coke to a particle size of 1-3 mm, mix the crushed petroleum coke and modified pitch at a weight ratio of 12:1, and then put the mixed raw materials into an electric kneader at a kneading temperature of 150°C. Vibrate for 8 minutes;

[0049] (3) The kneaded material is roasted in a tunnel kiln, the initial temperature is raised from 20 °C to 1150 °C at 1 °C / min, and the prebaked electrode is obtained after heat preservation and roasting for 90 hours.

Embodiment 3

[0051] (1) Modify the asphalt according to the ratio in Table 2, the modification temperature is 180°C, shear 18min at 2968r / min, stir for 4h, and obtain modified asphalt;

[0052] (2) Crush the petroleum coke to a particle size of 1-3 mm, mix the crushed petroleum coke and modified pitch at a weight ratio of 10:1, and then put the mixed raw materials into an electric kneader at a kneading temperature of 130°C. Vibrate for 6 minutes;

[0053] (3) The kneaded material was roasted in a tunnel kiln, and the temperature was raised from an initial temperature of 20 °C to 1125 °C at 1 °C / min, and the prebaked electrode was obtained after heat preservation and roasting for 95 hours.

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Abstract

The invention relates to the field of electrolysis, and discloses a prebaked anode and a preparation method and application thereof. The method comprises the steps that modified asphalt and petroleum coke are mixed and kneaded, and an obtained product is roasted to obtain the prebaked anode, wherein the quinoline insoluble substance value of the modified asphalt is 15-19, and the weight ratio of the modified asphalt to the petroleum coke is 1: (8-12). The prebaked anode prepared by the method can achieve the optimal balance between improving the anode scrap rate (namely the anode scrap rate is greater than or equal to 85wt%) and not reducing other parameters, and the other parameters are not lower than those in the prior art, so that the prebaked anode is wide in adaptability.

Description

technical field [0001] The invention relates to the field of electrolysis, in particular to a prebaked anode and its preparation method and application. Background technique [0002] Prebaked anodes are used as anode materials in prebaked aluminum electrolytic cells. In the prior art, petroleum coke and pitch coke are usually used as aggregates, and coal tar pitch is used as a binder. This kind of carbon block has been roasted and has a stable geometric shape, so it is also called prebaked anode carbon block, and it is also called carbon anode for aluminum electrolysis. The aluminum electrolytic cell using the prebaked anode carbon block as the anode is called the prebaked anode electrolytic cell, referred to as the prebaked cell, and is a modern large-scale aluminum electrolytic cell. [0003] In the prior art, calcined petroleum coke is commonly used to prepare prebaked anodes with pitch, and the prepared prebaked anodes can achieve the following properties: apparent den...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/12
CPCC25C3/125
Inventor 孙占龙赵宝龙
Owner 山西沁新能源集团股份有限公司
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