Novel optimized prebaked anode recipe for aluminum electrolysis

A technology of prebaked anodes and aluminum electrolysis, which is applied in the field of improving the production stability of prebaked anodes for aluminum electrolysis, and can solve problems such as electrolyte carbon content, accelerated consumption of prebaked anodes, and weakened electrochemical action, so as to reduce internal defects , Excellent carbon consumption index, small process changes

Active Publication Date: 2018-06-29

INNER MONGOLIA HUOMEI TONGSHUN CARBON

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AI-Extracted Technical Summary

Problems solved by technology

If the stability of the prebaked anode is poor, the consumption of the prebaked anode will be accelerated, and more seriously, the slag and blocks will be oxidized, which will cause the electrolyte to contain carbon, thereby deteriorating the performance of the ...

Abstract

The invention discloses a novel optimized prebaked anode recipe for aluminum electrolysis. Petroleum coke in a raw material is calcinated and broken into four types of granules different in granularity, the purity of all the calcinated petroleum coke granules is controlled, the ratio of the granules different in granularity and the ratio of coal pitch are defined, the production stability of a prebaked anode can be effectively improved, and the quality of the prebaked anode is guaranteed. The invention further provides a preparation method for the prebaked anode for aluminum electrolysis, andthe preparation method is high in operability and practicability. The prebaked anode produced by the prebaked anode optimized recipe completely meets all performance required by YS/T285-2012, and internal defects are obviously reduced. The prebaked anode produced by the prebaked anode optimized recipe has a good use effect in the aluminum electrolysis production process, all indexes reach or exceed the domestic advanced level, particularly the carbon consumption index is excellent, and the novel optimized prebaked anode recipe is small in process change and good in compatibility with the priorart and has quite good prospect.

Technology Topic

Aluminum electrolysisAluminium +5

Image

Examples

Experimental program(13)
Comparison scheme(12)
Effect test(1)

Example Embodiment

[0089] Example 1 A new and optimized pre-baked anode formula for aluminum electrolysis

[0090] The total weight of the paste is 4000kg, of which:

[0091] Coal pitch 628kg;

[0092] The calcined petroleum coke is 3372kg.

[0093] The calcined petroleum coke is a mixture of four calcined petroleum coke materials with different particle sizes, and the masses of the mixtures are:

[0094] 978kg of calcined petroleum coke pellets with a particle size of 3-6mm;

[0095] 708kg of calcined petroleum coke pellets with a particle size of 1-3mm;

[0096] 1,315kg of calcined petroleum coke powder (the mass of powder with a particle size of less than 0.075mm is 750kg);

[0097] 371kg of calcined petroleum coke particles with a particle size of less than 1mm.

[0098] Preparation:

[0099] (1) Material preparation: the coal tar pitch is melted and left to stand for use within 72 hours; the petroleum coke is calcined, crushed, and sieved according to the method provided in Example 1, and then divided into particles of different particle sizes for use.

[0100] (2) Ingredients and kneading: Put the calcined petroleum coke and coal tar pitch into the kneader according to the formula amount, and control the temperature to 170°C before being out of the pot to obtain a paste with certain plasticity;

[0101] (3) Molding: the paste prepared in step (2) is vibrated and molded by a vibration molding machine to obtain an anode green block;

[0102] (4) Roasting: Place the anode green block obtained in step (3) in a roasting furnace for roasting, and the product will be obtained after cleaning. The roasting process parameters are: the heating rate of the roasting flue is 13℃/h, and the maximum flue temperature is 1170 ℃, anode temperature ≥1050℃, holding time 65h.

Example Embodiment

[0103] Example 2 A new and optimized pre-baked anode formula for aluminum electrolysis

[0104] The total weight of the paste is 4000kg, of which:

[0105] Coal pitch 588kg;

[0106] The calcined petroleum coke is 3412kg.

[0107] The calcined petroleum coke is a mixture of four calcined petroleum coke materials with different particle sizes, and the masses of the mixtures are:

[0108] 954kg of calcined petroleum coke pellets with a particle size of 3-6mm;

[0109] 615kg of calcined petroleum coke pellets with a particle size of 1-3mm;

[0110] 1256kg of calcined petroleum coke powder (the mass of powder with a particle size of less than 0.075mm is 752kg);

[0111] 587kg of calcined petroleum coke particles with a particle size of less than 1mm.

[0112] Preparation:

[0113] (1) Material preparation: the coal tar pitch is melted and left to stand for use within 72 hours; the petroleum coke is calcined, crushed, and sieved according to the method provided in Example 1, and then divided into particles of different particle sizes for use.

[0114] (2) Ingredients and kneading: Put the calcined petroleum coke and coal tar pitch into the kneader according to the formula amount, and control the temperature to 173°C before leaving the pot to obtain a paste with certain plasticity;

[0115] (3) Molding: the paste prepared in step (2) is vibrated and molded by a vibration molding machine to obtain an anode green block;

[0116] (4) Roasting: Place the anode green block obtained in step (3) in a roasting furnace for roasting, and the product will be obtained after cleaning. The roasting process parameters are: the heating rate of the roasting flue is 11℃/h, and the maximum flue temperature is 1170 ℃, anode temperature ≥1050℃, holding time 58h.

Example Embodiment

[0117] Example 3 A new and optimized pre-baked anode formula for aluminum electrolysis

[0118] The total weight of the paste is 4000kg, of which:

[0119] Coal pitch 596kg;

[0120] The calcined petroleum coke is 3404kg.

[0121] The calcined petroleum coke is a mixture of four calcined petroleum coke materials with different particle sizes, and the masses of the mixtures are:

[0122] 978kg of calcined petroleum coke pellets with a particle size of 3-6mm;

[0123] 619kg of calcined petroleum coke particles with a particle size of 1-3mm;

[0124] 1259kg of calcined petroleum coke powder (the mass of powder with a particle size of less than 0.075mm is 755kg);

[0125] 548kg of calcined petroleum coke particles with a particle size of less than 1mm.

[0126] Preparation:

[0127] (1) Material preparation: the coal tar pitch is melted and left to stand for use within 72 hours; the petroleum coke is calcined, crushed, and sieved according to the method provided in Example 1, and then divided into particles of different particle sizes for use.

[0128] (2) Ingredients and kneading: Put the calcined petroleum coke and coal tar pitch into the kneader according to the formula amount, and control the temperature to 175°C before being out of the pot to obtain a paste with certain plasticity;

[0129] (3) Molding: the paste prepared in step (2) is vibrated and molded by a vibration molding machine to obtain an anode green block;

[0130] (4) Roasting: Place the anode green block obtained in step (3) in a roasting furnace for roasting, and the product will be obtained after cleaning; the roasting process parameters are: the heating rate of the roasting flue is 12℃/h, and the maximum flue temperature is 1170 ℃, anode temperature ≥1050℃, holding time 60h.

PUM

Property	Measurement	Unit
Granularity	3.0 ~ 6.0	mm
Granularity	1.0 ~ 3.0	mm
Granularity	<= 0.075	mm

Description & Claims & Application Information

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Novel optimized prebaked anode recipe for aluminum electrolysis

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Examples

Example Embodiment

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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