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Method for preparing prebaked anode with high-sulfur coke

A prebaked anode and high-sulfur coke technology, which is applied in the field of high-sulfur coke to prepare prebaked anodes, can solve the problems of low density of formed green blocks, increased resistivity, and large porosity of high-sulfur coke

Inactive Publication Date: 2013-04-10
HUNAN CHUANGYUAN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The embodiment of the present invention provides a method for preparing a prebaked anode with high-sulfur coke without affecting the quality of the anode, which effectively solves the problem of low density of forming green blocks caused by high-sulfur coke with large porosity and poor strength characteristics, and the product is easy to bake during roasting. Cracks, problems with increased resistivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for preparing prebaked anodes with high-sulfur coke, mixing high-sulfur coke and low-sulfur coke in proportion to form mixed coke, comprising the following steps:

[0026] A. Separately calcinate high-sulfur coke with a sulfur content of 3-5% in a rotary kiln at 1250-1350°C, and store it in a special calcined warehouse for high-sulfur coke;

[0027] Separate calcination of high-sulfur coke, on the one hand, can use high temperature to remove part of the sulfur, and control the sulfur content in the prebaked anode so that it will not be too high; 2 Flue gas, so that it does not cause corrosion to the equipment.

[0028] B. Making the calcined high-sulfur coke into powder;

[0029] After the high-sulfur coke is crushed into particles with a particle size of less than 20 mm, it is then ground by a ball mill to make a powder with a particle size of less than 200 mesh, accounting for 65-75%. The fine powder can eliminate the defects of large porosity and loose str...

Embodiment 2

[0032] Embodiment two, including steps are as follows:

[0033] A. Separately calcinate high-sulfur coke with a sulfur content of 4.8% at 1250°C in a rotary kiln, and store it in a special calcined warehouse for high-sulfur coke;

[0034] B, the calcined high-sulfur coke is made into powder; the process requirements are the same as in Example 1, and will not be repeated below;

[0035] C, the powder with a sulfur content of 4.8% is batched according to the normal production process, and the weight ratio of S / Ca in the raw material is 62:1.

[0036] The mixed coke is mixed with 27% of anode residue, 5% of raw chips, and 17% of asphalt, and the production is carried out according to the normal process requirements. Compared with the anode produced directly by using high-sulfur coke, the obtained prebaked anode has significantly improved appearance quality, and the bulk density of the green block is 1.62g / cm 3 , the pass rate of baking is 98.7%, the resistivity of the prebaked ...

Embodiment 3

[0037] Embodiment three, including steps are as follows:

[0038] A. Separately calcinate high-sulfur coke with a sulfur content of 4.5% at 1350°C in a rotary kiln, and store it in a special calcined warehouse for high-sulfur coke;

[0039] B. Making the calcined high-sulfur coke into powder;

[0040] C, the powder with a sulfur content of 4.5% is batched according to the normal production process, and the weight ratio of S / Ca in the raw material is 50:1.

[0041] The mixed coke is mixed with 30% of anode residue, 5% of raw chips, and 16% of asphalt, and the production is carried out according to the normal process requirements. Compared with the anode produced directly by using high-sulfur coke, the obtained prebaked anode has significantly improved appearance quality, and the bulk density of the green block is 1.64g / cm 3 , the pass rate of firing is 98.2%, the resistivity of the prebaked anode is 53.4μΩm, and the anode CO 2 The reaction residual rate is 83.7%, and the air...

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Abstract

The present invention discloses a method for preparing a prebaked anode with high-sulfur coke. The high-sulfur coke is calcinated independently and grinded into powder in the prebaked anode formulation. The method comprises the following steps: A, calcinating the high sulfur coke with a sulfur content of 3-5% at 1250-1350 DEG C in a rotary kiln independently, then storing in a high-sulfur coke dedicated rear-calcination cabin; B, preparing the high-sulfur coke after calcination into powder; and C, dosing the powder with a sulfur content of 3-5% according to a normal production process, wherein the weight ratio of S / Ca in the raw material is (36-62):1. An embodiment of the invention can solve the problems that the molding raw block is low in density and the products are easy to crack in calcinations through calcinating the high sulfur coke independently, storing independently and making into the powder as an anode material; and can improve the oxidation resistance of the anode and reduce the environmental pollution caused by the high sulfur coke in the prior art.

Description

technical field [0001] The invention relates to the technical field of carbon anode preparation, in particular to a method for preparing a prebaked anode with high-sulfur coke. Background technique [0002] As the anode material of electrolytic aluminum, the prebaked anode plays the role of conducting electricity and participating in the electrochemical reaction in the aluminum electrolytic cell. The quality of the prebaked anode has a great influence on the stable operation of the electrolytic cell. [0003] As the main raw material for prebaked anode production, petroleum coke generally accounts for about 65% of the weight of the anode and plays a decisive role in the quality of the prebaked anode. Sulfur content is an important indicator for evaluating the grade of petroleum coke, and those with sulfur content > 3% are high-sulfur coke. [0004] High sulfur coke is characterized by loose and porous structure, low strength, easy to break, and low bulk density. Moreove...

Claims

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Application Information

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IPC IPC(8): C25C3/12
Inventor 聂智良江林涛
Owner HUNAN CHUANGYUAN NEW MATERIALS
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