CN100582310C - Pre-baked anode for aluminum electrolysis and its preparation method - Google Patents
Pre-baked anode for aluminum electrolysis and its preparation method Download PDFInfo
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- CN100582310C CN100582310C CN200710065938A CN200710065938A CN100582310C CN 100582310 C CN100582310 C CN 100582310C CN 200710065938 A CN200710065938 A CN 200710065938A CN 200710065938 A CN200710065938 A CN 200710065938A CN 100582310 C CN100582310 C CN 100582310C
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Abstract
The invention relates to a prebaked anode cell and the preparation method. It comprises following steps: (1) designing the shape for prebaked anode cell; (2) adding waste corner aluminum wire produced in aluminum production process during carbon anode preparation, to improve the conductivity for cabon anode, the addition amount is 1.5- 2.0%., the aluminum wire is filled into the micropores when it is conversed into liquid from solid during calcination, to increase the carrier for carbon anode base material. The invention is characterized by saved raw material cost, easy operation and management for thermal- insulating cover material, good flowability of filled material, increased currency efficiency by 0.5%, reduced resources consumption, 4.44 ton of recovery waste aluminum, and reduced carbon dioxide emmision.
Description
Technical field
The present invention relates to technical field of aluminum electrolysis, particularly prebaked anode of a kind of electrolysis of aluminum and preparation method thereof.
Background technology
In recent years, domestic aluminum electrolysis industry development is swift and violent, and its industrial scale constantly increases, and state of the art is greatly improved, and current efficiency and power consumption have had tangible progress.But with compare in addition very big gap abroad, be wanting in apart from bigger at power consumption especially, domestic average ton aluminium alternating-current unit consumption reaches 14600kwh/t, also is higher than external far away; With regard to present China electrolytic aluminum integral production state, comprehensive utilization of energy efficient is lower by about 15% than international most advanced level.Therefore, advancing recycling economy, energy-saving and emission-reduction, the friendly enterprise of built environment is the target that aluminum electrolysis industry is pursued.
In aluminium electrolysis process, the quality of quality of prebaked anode not only influences a ton Lv Tan Mao, and, all influential to current efficiency, energy consumption, primary aluminum quality, environmental pollution, electrolysis procedure and cell maintenance etc.For electrolysis of aluminum provides energy-saving and environmental protection, efficient, high-quality prebaked anode, be emphasis and the focus of current aluminium with the carbon industry technological innovation.
Carbon anode is as " heart " material of electrolysis of aluminum, and its effect is exactly that electric current is imported electrolyzer and participates in electrochemical reaction.Carbon anode is installed in upper part of the electrolytic cell, powerful direct current imports aluminium cell by carbon anode, the aluminum oxide and the electrolyte block of the top covering and heat insulating of carbon anode, the middle part is surrounded by the electrolysis mass shell, the bottom is immersed in the fused fluoride salt ionogen, under the hot environment about 960 ℃, carbon anode bottom and aluminum oxide generation electrochemical reaction finally generate CO, CO
2The electric energy of its consumption accounts for about 10～15% of whole Aluminium Electrolysis power consumption; Because the working conditions and the environmental factors of carbon anode make carbon anode be surrounded by oxidizing atmosphere system on every side; In addition, carbon anode can not be fully by electrolysis, and still residual have small part to return the plain production line of charcoal, can produce the starting material of carbon anode after fragmentation.
The anodic electrolysis is divided into electrochemistry consumption, chemical depletion and machinery and consumes.Electrochemistry consumption is carbon anode and aluminum oxide generation electrochemical reaction: C+Al
2O
3→ Al+CO
2, and the CO that reaction generates
2Can react with carbon anode again: C+CO
2→ CO, this mainly occurs in the anode bottom; The reaction that takes place at four faces and the top of charcoal piece mainly is chemical reaction: C+O
2→ CO
2Theoretically, ton Lv Tan Mao is 334kg, and electrolysis is that (CE is a current efficiency to 334/CE=352kg, calculate by 95%), and actual this value that is far longer than has the pass data to report for work, external De Jing Mao is 400～450kg, and Guo Nei Jing Mao is about 450kg, and the difference of the two is 98kg.Therefore, improve the antioxidant property of charcoal piece, the space of reducing charcoal piece luxus consumption is bigger.
Summary of the invention
The prebaked anode (carbon anode) and other the preparation method that the purpose of this invention is to provide a kind of energy-saving and environmental protection, efficient, fine electrolysis of aluminum.
The present invention is minimizing, recirculation, utilizes as guiding theory with the 3R principle of recycling economy, realizes the net effect that reduces first resource input amount, reduction energy consumption, reduces pollutent and greenhouse gas emission by the composite application of anode configuration optimization design, metal high conductive material.
Technical scheme of the present invention is:
First part: the optimization design of prebaked anode profile: the scarp of the terrace with edge part on carbon anode top is a concave curved surface, and four corner angle of carbon anode are the circular arc angle, and two long limits of carbon anode bottom are square chamfering.
Second section: the slitter edge angle fine aluminium silk that mixes the generation of aluminium processing process in the anode production process is used as improving the additive of carbon anode conductivity, promptly in the charcoal piece, add 1.5～2.0 ‰ aluminium wire, these aluminium wires become liquid phase by solid phase in the roasting process, filling is compound in the carbonaceous particulate micropore, make the current carrier of carbon anode matrix increase, so improve the concentration of carbon anode current carrier, compound like this and carbon anode, its conductivity is improved greatly, thereby reduce the electrolysis utmost point piece pressure drop of carbon anode, realize the raising of current efficiency and the reduction of electrolysis of aluminum energy consumption.And realized the recycling of scrap stock preferably.
The present invention compared with prior art has following positively effect:
(1) carries out global design by the carbon anode outward appearance, the cost that can economize in raw materials, the average every living piece 12.5kg that can economize in raw materials; Saved 12.5 * 222000 ÷ 1000=2775 tons in 1 year; Change the scarp into concave curved surface, increased the charcoal piece and stacked the useful area that electrolysis of aluminum is incubated mulch, help operation and the management of aluminium cell the insulation mulch; Chamfering is changed into arc chord angle, and stopping composition good fluidity, stopping composition can be filled between two charcoal piece ends in the space, and the space is reduced, and the quantity of falling the rib arrisdefect significantly reduces; In addition, after optimizing by the arc chord angle mode, can remove a certain amount of scrap stock, thereby save the part thickener, reduce the consumption of part energy resource.
(2) improve Faradaic current efficient 0.5%;
(3) 4.44 tons of waste and old bauxite resources are recycled in the consumption of minimizing resource, reduce CO
2Quantity discharged.
As the aluminium industry of Gao Mao energy, resources conservation, comprehensive utilization of energy rate height, environmental friendliness are one of important factors that realizes Sustainable Development of Enterprises.Therefore, adopt energy-saving and environmental protection, prebaked anode is the prerequisite and the guarantee of modern aluminum industry sustainable development efficiently.In the same industry, has big popularizing action.
Description of drawings
Fig. 1 is a carbon anode front view of the present invention;
Fig. 2 is a carbon anode vertical view of the present invention;
Fig. 3 is a carbon anode side-view of the present invention;
Fig. 4 is a carbon anode stereographic map of the present invention.
Embodiment
Embodiment 1:
1) optimization design of prebaked anode profile: the scarp of the terrace with edge part on carbon anode top is a concave curved surface, shown in 3 among 1 among Fig. 1 and Fig. 3; Four corner angle of carbon anode are the circular arc angle, shown in 2 among Fig. 2; Two long limits of carbon anode bottom are square chamfering, shown in 4 among Fig. 3.
2) in carbon anode (piece) production process, mix the additive that slitter edge angle aluminium wire that aluminium processing process produces is used as improving the carbon anode conductivity, promptly in carbon anode production process, add 1.5 ‰ aluminium wire, when these aluminium wires become liquid phase by solid phase in roasting process, filling is compound in the carbonaceous particulate micropore, make the current carrier of carbon anode matrix increase, so improve the concentration of carbon anode current carrier.
Embodiment 2:
1) optimization design of prebaked anode profile is identical with embodiment 1;
2) in carbon anode (piece) production process, mix the additive that slitter edge angle aluminium wire that aluminium processing process produces is used as improving the carbon anode conductivity, promptly in charcoal piece production process, add 2.0 ‰ aluminium wire, when these aluminium wires become liquid phase by solid phase in roasting process, filling is compound in the carbonaceous particulate micropore, make the current carrier of carbon anode matrix increase, so improve the concentration of carbon anode current carrier.
Claims (1)
1, a kind of prebaked anode of electrolysis of aluminum is characterized in that preparing by the following method:
1) prebaked anode configuration design: the scarp of the terrace with edge part on carbon anode top is a concave curved surface, and four corner angle of carbon anode are the circular arc angle, and two long limits of carbon anode bottom are square chamfering, and removing part is the right-angled trapezium of 30 * a 40 * 4mm;
2) in carbon anode production process, mix the additive that slitter edge angle aluminium wire that aluminium processing process produces is used as improving the carbon anode conductivity, promptly in carbon anode production process, add 1.5～2.0 ‰ aluminium wire, when roasting, when these aluminium wires become liquid phase by solid phase, filling is compound in the carbonaceous particulate micropore, makes the current carrier of carbon anode matrix increase.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710065938A CN100582310C (en) | 2007-06-07 | 2007-06-07 | Pre-baked anode for aluminum electrolysis and its preparation method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710065938A CN100582310C (en) | 2007-06-07 | 2007-06-07 | Pre-baked anode for aluminum electrolysis and its preparation method |
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| Publication Number | Publication Date |
|---|---|
| CN101086072A CN101086072A (en) | 2007-12-12 |
| CN100582310C true CN100582310C (en) | 2010-01-20 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102747383B (en) * | 2011-04-18 | 2015-06-24 | 湖南晟通科技集团有限公司 | Usage method of prebaked anode |
| CN103952721B (en) * | 2014-04-21 | 2016-04-13 | 西安建筑科技大学 | A kind of blue charcoal base carbon anode used for aluminium electrolysis and preparation method thereof |
| CN104313642B (en) * | 2014-11-17 | 2017-10-13 | 中南大学 | A kind of method for reducing aluminium electrolysis anode air film voltage drop |
| CN104694967A (en) * | 2015-03-29 | 2015-06-10 | 索通发展股份有限公司 | Prebaked anode baking technology by utilizing smelting slags as filler |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5080963A (en) * | 1989-05-24 | 1992-01-14 | Auburn University | Mixed fiber composite structures high surface area-high conductivity mixtures |
| CN2623703Y (en) * | 2003-06-13 | 2004-07-07 | 沈阳铝镁设计研究院 | Anode carbon block with gain groove |
| CN1621565A (en) * | 2003-11-28 | 2005-06-01 | 中南大学 | Modified prebaked carbon anode for electrolysis of aluminum and preparing method thereof |
| CN1252207C (en) * | 2003-05-27 | 2006-04-19 | 中南大学 | High temperature conductive binding material for aluminium electrolysis |
-
2007
- 2007-06-07 CN CN200710065938A patent/CN100582310C/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5080963A (en) * | 1989-05-24 | 1992-01-14 | Auburn University | Mixed fiber composite structures high surface area-high conductivity mixtures |
| CN1252207C (en) * | 2003-05-27 | 2006-04-19 | 中南大学 | High temperature conductive binding material for aluminium electrolysis |
| CN2623703Y (en) * | 2003-06-13 | 2004-07-07 | 沈阳铝镁设计研究院 | Anode carbon block with gain groove |
| CN1621565A (en) * | 2003-11-28 | 2005-06-01 | 中南大学 | Modified prebaked carbon anode for electrolysis of aluminum and preparing method thereof |
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| CN101086072A (en) | 2007-12-12 |
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