CN1229523C - Process for producing cathode carbon block for aluminum cell - Google Patents
Process for producing cathode carbon block for aluminum cell Download PDFInfo
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- CN1229523C CN1229523C CN 03156248 CN03156248A CN1229523C CN 1229523 C CN1229523 C CN 1229523C CN 03156248 CN03156248 CN 03156248 CN 03156248 A CN03156248 A CN 03156248A CN 1229523 C CN1229523 C CN 1229523C
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- refinery coke
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Abstract
The present invention relates to a production method for a cathode carbon block of an aluminium electrolytic cell, which is characterized in that the present invention comprises: pulverization, sieving, blending, pugging, forming, once calcination, impregnation, secondary calcination and processing. In cathode paste, 10% to 80% of half graphitized petroleum coke, 10% to 80% of fully graphitized petroleum coke, 10% to 15% of electrically calcined anthracite and 0% to 10% of calcined chips are used according to weight percentage, wherein the half graphitized petroleum coke is added in the forms of particles and powder, the fully graphitized petroleum coke is added in the forms of particles and powder, the electrically calcined anthracite is added in the form of particles, and the calcined chips are added as aggregates in the form of particles. Tempering coal pitch containing 0% to 30% of coal tar is used as adhesives, aggregates account for 80% to 85% of the paste (weight percentage), and the adhesives account for 15% to 20% of the paste. Pugging temperature is from 130 to 180 DEG C, forming temperature is from 110 to 150 DEG C, once calcination temperature is from 700 to 1000 DEG C, and secondary calcination temperature is from 1100 to 1300 DEG C. The present invention has the advantages of short production process flow and low production cost, and the performance indexes of products meet use requirements.
Description
Technical field
The present invention relates to a kind of production method of cathod carbon block used in aluminium electrolytic bath.
Background technology
At present, the employed cathode carbon pieces of aluminium cell is divided into two classes basically.One class cathode carbon pieces is to be main raw material with the electric calcined anthracite, the synthetic graphite that adds different content is broken, add coal-tar pitch as binding agent, by " broken, screening, batching, mix pinch, moulding, roasting, manufacturing procedure ", and the semi-graphite cathode carbon block of producing.The broken limited amount of synthetic graphite that this kind production technique needs, and quality is wayward, not only influences quality product, and limits product quantity.Another kind of cathode carbon pieces is that the employing after-smithing petroleum coke is a main raw material, add coal-tar pitch as binding agent, by " broken, screening, batching, mix pinch, moulding, bakes to burn the article, dipping, re-baking, greying, manufacturing procedure " the full graphitized cathode carbon block produced.The anti-sodium erosional competency of semi-graphite cathode carbon block is poor, furnace bottom pressure drop height; The technological process of production of full graphitized cathode carbon block is long, the energy consumption height, and price is expensive, and the resistance to abrasion of product is poor.These two kinds of products all are unfavorable for prolonging bath life.
Summary of the invention
The objective of the invention is the deficiency at above-mentioned prior art, providing a kind of can effectively shorten the technological process of production, reduces production costs, and its product performance are fit to the production method of the cathode carbon pieces of aluminium cell requirement.
Method of the present invention is achieved through the following technical solutions.
A kind of production method of cathod carbon block used in aluminium electrolytic bath is characterized in that this method comprises:
A. broken, screening, batching, mix pinch, moulding, bakes to burn the article, dipping, re-baking, manufacturing procedure;
B. cathode paste comprises aggregate and binding agent, and binding agent is selected for use and contained the modified coal-tar pitch that coal tar weight per-cent is 0%-30%, and the weight percent that binding agent accounts for cathode paste is 15%-20%; Select the particle of 10%-80% or the semi-graphited refinery coke of powder form in the aggregate for use, the full greying refinery coke of the particle of 10%-80% or powder form, the electric calcined anthracite of the particle form of 10%-50%, the roasting of the particle form of 0%-10% is broken, and the weight percent that aggregate accounts for cathode paste is 80%-85%, must contain semi-graphited refinery coke or full greying refinery coke in the aggregate;
C. kneading temperature is 130 ℃-180 ℃;
D. mold temperature is 110 ℃-150 ℃;
E. the bakes to burn the article temperature is 700 ℃-1000 ℃;
F. the re-baking temperature is 1100 ℃-1300 ℃.
The production method of a kind of cathod carbon block used in aluminium electrolytic bath of the present invention is characterized in that: add (weight percent) 1%-10% boron oxide or norbide or aluminosilicate as the catalyzed graphitization additive when producing semi-graphited refinery coke and full greying refinery coke.
The production method of a kind of cathod carbon block used in aluminium electrolytic bath of the present invention is characterized in that: add (weight percent) 1%-10% boron oxide or norbide or aluminosilicate when producing electric calcined anthracite as the catalyzed graphitization additive.
Because it is short to have adopted technique scheme, the present invention to have the technological process of production, production cost is low, its product performance: true density 2.10-2.20g/cm
3, volume density 1.56-1.65g/cm
3, resistivity 16-36 μ Ω m, thermal conductivity 25-45W/mK, ultimate compression strength 20-38MPa, folding strength 3-7MPa.
Embodiment
Come method of the present invention is described further below in conjunction with embodiment.
A kind of production method of cathod carbon block used in aluminium electrolytic bath is characterized in that this method comprises: a. fragmentation, screening, batching, mix pinch, moulding, bakes to burn the article, dipping, re-baking, manufacturing procedure; B. selecting the semi-graphited refinery coke in the cathode paste by weight percentage for use is 10%-80%, add with particle form, full greying refinery coke is 10%-80%, add with particle, powder form, electric calcined anthracite is 10%-50%, add with particle form, roasting is broken to be 0%-10%, add as aggregate with particle form, select for use the modified coal-tar pitch that contains coal tar 0%-30% as binding agent, its aggregate accounts for the 80%-85% of thickener (weight percent), and its binding agent accounts for the 15%-20% of thickener.C. kneading temperature is 130 ℃-180 ℃; D. mold temperature is 110 ℃-150 ℃; E. the bakes to burn the article temperature is 700 ℃-1000 ℃; F. the re-baking temperature is 1100 ℃-1300 ℃.Semi-graphited refinery coke and full greying refinery coke add (weight percent) 1%-10% boron oxide or aluminosilicate additive.Electric calcined anthracite adds (weight percent) 1%-10% boron oxide or aluminosilicate additive.
Embodiment 1
In cathode paste, add the full greying refinery coke of producing as additive with 1% norbide (weight percent) 30%, add with the powder form; The semi-graphited refinery coke is 40%, adds with particle, powder form; Electric calcined anthracite is 13%, adds with particle form; Adding the 17% modified coal-tar pitch that contains 0% coal tar is binding agent; 165 ℃ of kneading temperatures, 150 ℃ of mold temperatures, 750 ℃ of bakes to burn the article temperature, 1200 ℃ of re-baking temperature.The na expansion coefficient of products obtained therefrom is 0.55%, and resistivity is 16 μ Ω m, and other performance index meet the demands.
Embodiment 2
In cathode paste, add the full greying refinery coke of producing as additive with 1% aluminosilicate (weight percent) 40%, add with the powder form; The semi-graphited refinery coke is 20%, and electric calcined anthracite is 23%, and roasting is broken to be 2%, all adds with particle form; With the modified coal-tar pitch that contains 10% coal tar is binding agent, and add-on is 15%; 160 ℃ of kneading temperatures, 145 ℃ of mold temperatures, 800 ℃ of bakes to burn the article temperature, 1250 ℃ of re-baking temperature.The na expansion coefficient of products obtained therefrom is 0.50%, and resistivity is 26 μ Ω m, and other performance index meet the demands.
Embodiment 3
In cathode paste, add the full greying refinery coke of producing as additive with 5% boron oxide (weight percent) 50%, add with small-particle, powder; Electric calcined anthracite is 32%, adds with particle, powder form; To contain the modified coal-tar pitch of 30% coal tar is binding agent, and add-on is 18%; 150 ℃ of kneading temperatures, 140 ℃ of mold temperatures, 850 ℃ of bakes to burn the article temperature, 1150 ℃ of re-baking temperature.The na expansion coefficient of products obtained therefrom is 0.40%, and resistivity is 32 μ Ω m, and other performance index meet the demands.
Embodiment 4
In cathode paste, add the full greying refinery coke of producing as additive with 8% aluminosilicate (weight percent) 70%, add with particle, powder form; Electric calcined anthracite is 15%, adds with particle form; It is binding agent that adding 15% contains the modified coal-tar pitch of 20% coal tar; 155 ℃ of kneading temperatures, mold temperature are 145 ℃, and the bakes to burn the article temperature is 850 ℃, 1200 ℃ of re-baking temperature.The na expansion coefficient of products obtained therefrom is 0.30%, and resistivity is 34 μ Ω m, and other performance index meet the demands.
Embodiment 5
In cathode paste, add the semi-graphited refinery coke of producing as additive with 5% boron oxide (weight percent) 50%, add with particle, powder; Full greying refinery coke is 20%, adds with the powder form; Electric calcined anthracite is 10%, adds with particle form; Adding the 20% modified coal-tar pitch that contains 30% coal tar is binding agent, 155 ℃ of kneading temperatures, 140 ℃ of mold temperatures, 900 ℃ of bakes to burn the article temperature, 1250 ℃ of re-baking temperature.The na expansion coefficient of products obtained therefrom is 0.30%, and resistivity is 20 μ Ω m, and other performance index meet the demands.
Embodiment 6
Adding the semi-graphited refinery coke of producing as additive with 8% aluminosilicate in cathode paste is (weight percent) 70%, adds with particle, powder form; Electric calcined anthracite is 13%, adds with particle form; Adding the 17% modified coal-tar pitch that contains 15% coal tar is binding agent, 160 ℃ of kneading temperatures, 150 ℃ of mold temperatures, 950 ℃ of bakes to burn the article temperature, 1250 ℃ of re-baking temperature.The na expansion coefficient of products obtained therefrom is 0.25%, and resistivity is 36 μ Ω m, and other performance index meet the demands.
Embodiment 7
Adding the electric calcined anthracite of producing as additive with 5% boron oxide in cathode paste is (weight percent) 50%, adds with particle, powder form; Full greying refinery coke is 30%, adds with the powder form; Roasting is broken to be 3%, adds with particle form; Adding the 17% modified coal-tar pitch that contains 0% coal tar is binding agent; 170 ℃ of kneading temperatures, 150 ℃ of mold temperatures, 750 ℃ of bakes to burn the article temperature, 1200 ℃ of re-baking temperature.The na expansion coefficient of products obtained therefrom is 0.55%, and resistivity is 24 μ Ω m, and other performance index meet the demands.
Claims (3)
1. the production method of a cathod carbon block used in aluminium electrolytic bath is characterized in that this method comprises:
A. broken, screening, batching, mix pinch, moulding, bakes to burn the article, dipping, re-baking, manufacturing procedure;
B. cathode paste comprises aggregate and binding agent, and binding agent is selected for use and contained the modified coal-tar pitch that coal tar weight per-cent is 0%-30%, and the weight percent that binding agent accounts for cathode paste is 15%-20%; Select the particle of 10%-80% or the semi-graphited refinery coke of powder form in the aggregate for use, the full greying refinery coke of the particle of 10%-80% or powder form, the electric calcined anthracite of the particle form of 10%-50%, the roasting of the particle form of 0%-10% is broken, and the weight percent that aggregate accounts for cathode paste is 80%-85%, must contain semi-graphited refinery coke or full greying refinery coke in the aggregate;
C. kneading temperature is 130 ℃-180 ℃;
D. mold temperature is 110 ℃-150 ℃;
E. the bakes to burn the article temperature is 700 ℃-1000 ℃;
F. the re-baking temperature is 1100 ℃-1300 ℃;
2. the production method of a kind of cathod carbon block used in aluminium electrolytic bath according to claim 1 is characterized in that: add weight percent when producing semi-graphited refinery coke and full greying refinery coke and be 1%-10% boron oxide or norbide or aluminosilicate as the catalyzed graphitization additive.
3. the production method of a kind of cathod carbon block used in aluminium electrolytic bath according to claim 1 is characterized in that: add weight percent when producing electric calcined anthracite and be 1%-10% boron oxide or norbide or aluminosilicate as the catalyzed graphitization additive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03156248 CN1229523C (en) | 2003-09-02 | 2003-09-02 | Process for producing cathode carbon block for aluminum cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03156248 CN1229523C (en) | 2003-09-02 | 2003-09-02 | Process for producing cathode carbon block for aluminum cell |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1485464A CN1485464A (en) | 2004-03-31 |
| CN1229523C true CN1229523C (en) | 2005-11-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 03156248 Expired - Lifetime CN1229523C (en) | 2003-09-02 | 2003-09-02 | Process for producing cathode carbon block for aluminum cell |
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100350077C (en) * | 2004-04-15 | 2007-11-21 | 方大炭素新材料科技股份有限公司 | Graphitic cathode carbon block for aluminium electrolytic bath and its producing method |
| CN100418878C (en) * | 2006-11-20 | 2008-09-17 | 彭绍权 | Production method of large diameter tubular semi-graphite carbon electrode |
| CN101949034B (en) * | 2010-09-30 | 2012-06-06 | 广西强强碳素股份有限公司 | Cathode graphitizing current stop block for aluminum electrolysis |
| CN102011147A (en) * | 2010-12-03 | 2011-04-13 | 伊川龙海科技实业有限公司 | Method for producing carbon electrodes by floating carbon powder and coal tar pitch with spent potlining (SPL) of aluminium electrolysis |
| CN104477902B (en) * | 2014-12-19 | 2016-11-16 | 汨罗市鑫高科技服务有限公司 | Porous aggregate preparation method and the preparation technology of high strength graphite thereof |
| CN105513664B (en) * | 2015-12-30 | 2017-12-15 | 海门名驰工业设计有限公司 | A kind of industrial conductive material and preparation method thereof |
| CN106376121B (en) * | 2016-08-26 | 2020-03-17 | 河北顺天电极有限公司 | High-graphite carbon electrode and preparation method thereof |
| CN107988618A (en) * | 2017-11-14 | 2018-05-04 | 中冶天工集团有限公司 | Aluminium cell hot ramming paste breaking method |
| CN108585863B (en) * | 2018-05-04 | 2020-12-01 | 武汉科技大学 | High-strength ultramicropore electrically-calcined coal-based carbon brick and preparation method thereof |
| CN112745129B (en) * | 2019-10-30 | 2023-04-07 | 吉林炭素有限公司 | Manufacturing method of carbon ceramic slag stopping back plate |
| CN110791779B (en) * | 2019-12-05 | 2021-08-10 | 中南大学 | Method for preparing carbon cathode for aluminum electrolysis by using waste cathode of aluminum electrolysis cell |
| CN111621813A (en) * | 2020-07-06 | 2020-09-04 | 山西三晋碳素股份有限公司 | Cathode carbon block material for aluminum electrolysis |
| CN112725837A (en) * | 2020-12-24 | 2021-04-30 | 神华准能资源综合开发有限公司 | Method for preparing carbon anode by using coal instead of petroleum coke |
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- 2003-09-02 CN CN 03156248 patent/CN1229523C/en not_active Expired - Lifetime
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