CN104005056A - Method for preparing electrolytic aluminium carbon anode protective coating - Google Patents
Method for preparing electrolytic aluminium carbon anode protective coating Download PDFInfo
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- CN104005056A CN104005056A CN201410231592.8A CN201410231592A CN104005056A CN 104005056 A CN104005056 A CN 104005056A CN 201410231592 A CN201410231592 A CN 201410231592A CN 104005056 A CN104005056 A CN 104005056A
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- carbon anode
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Abstract
The invention discloses a method for preparing an electrolytic aluminium carbon anode protective coating and relates to a method for preparing a coating. The method comprises the following steps of: uniformly mixing CA (calcium aluminate) cement serving as a binder and waste electrolyte which is produced in electrolytic aluminium production and taken as refractory aggregate with an additive, preparing into a dry coating, hermetically packing, transporting to an electrolytic aluminium factory, adding water, uniformly stirring to prepare the electrolytic aluminium carbon anode protective coating, coating the surface of a carbon anode with the lectrolytic aluminium carbon anode protective coating, coating the upper surface and side surfaces of the electrolytic aluminium carbon anode with a water-based coating, wherein coating or spraying is carried out 1-5 times, the thickness of the coating is 0.2-8mm and the coating is a single coating or a composite coating; drying the coating and carrying out electrolysis to obtain the electrolytic aluminium carbon anode protective coating finally. The coating has the characteristics that the waste electrolyte can be utilized, and therefore the coating is low in price and the environment pollution caused by harmful gases is reduced.
Description
Technical field
The present invention relates to a kind of preparation method of coating, particularly relate to a kind of preparation method of electrolytic aluminum carbon anode supercoat.
Background technology
The Hall-Heroult process that metallic aluminium electrolytic industry adopts, in Aluminium Electrolysis, adopt the very large rodent cryolite melt that has of high temperature, in the middle of various materials, can be high temperature resistant and resist this aggressiveness, cheap and have a carbon product that has only of good conductivity.
Carbon annode (being also graphite anode), when electrolysis, anode carbon is oxidized and consume, and wastes a large amount of high grade cokes, refinery coke.At present, in aluminum production expense, prebaked anode accounts for 15～20%.
The consumption of prebaked anode is except outside electrolysis (by Theoretical Calculation, produce 1 ton of aluminium and need consume 333～370 kilograms of prebaked anodes), and (state's inner anode consumes only at present, and 1 ton of aluminium need consume 450～480 kilograms of prebaked anodes to also have extra consumption; The extra consumption of carbon anode, has very major part by air and CO
2gas oxidation and cause falling grain to cause because of the selective oxidation of carbon anode.Visible employing coating protection carbon anode, can reduce anode and air and CO
2contact, play anodised effect.
Summary of the invention
The object of the present invention is to provide a kind of preparation method of electrolytic aluminum carbon anode supercoat; the present invention utilizes the waste cell melt of CA cement and electrolytic aluminum to make powdery; it is coated in carbon anode surface; reduce the oxidation of carbon anode in aluminium electrolysis process, play the object in the anode scrap of protection prebaked anode and the work-ing life of increase anode.
The object of the invention is to be achieved through the following technical solutions:
A kind of preparation method of electrolytic aluminum carbon anode supercoat, described method comprises take CA(calcium aluminate) cement is binding agent, the waste cell melt producing in Aluminum Electrolysis Production of take is refractory aggregate, add admixture, after mixing, prepare dry-coated material, through packing, be transported to electrolytic aluminium factory, after adding water and stirring, make electrolytic aluminum carbon anode supercoat, be coated in carbon anode surface, by water-based coating, be coated onto upper surface and the side surface of electrolytic aluminum carbon anode, smear or spray 1～5 time, coat-thickness 0.2～8mm, coating forms with single coating or compound coating, then dry coating, carry out electrolysis, , the waste cell melt producing in its Aluminum Electrolysis Production is refractory aggregate, and the granularity of refractory aggregate is 80-1000 order, and add-on is 80.0-95.0wt%, CA cement comprises CA-50, CA-60, CA-70, CA-80 and ρ-Al2O3.The add-on of CA cement is 5.0-20.0wt%; Admixture comprises trisodium phosphate, tripoly phosphate sodium STPP, Sodium hexametaphosphate 99, super sodium polyphosphate, sodium lignosulfonate, calcium lignin sulphonate, the 0.05-1wt% of the useless electrolysis in its add-on station and CA cement content.
Advantage of the present invention and effect are:
The present invention protects the method for electrolgtic aluminium carbon anode, will reduce in aluminium electrolysis process, and the extra consumption of anode, the extra consumption of carbon anode, has very major part by air and CO
2gas oxidation and cause falling grain to cause because of the selective oxidation of carbon anode; Adopt anodic protection coating, can reduce anode and air and CO
2contact, reduce the extra consumption of carbon anode, extend the work-ing life of carbon anode; Also can make waste and old ionogen be recycled simultaneously, reduce the pollution of waste cell melt to environment.
Accompanying drawing explanation
Fig. 1 is the not anode schematic diagram of coating layer of the principle of the invention;
Fig. 2 is that the principle of the invention is coated with cated anode schematic diagram.
Embodiment
Below in conjunction with accompanying drawing illustrated embodiment, the invention will be further described.
Fig. 1 is the anode of coating layer (black represents to be exposed to surperficial graphite) not, anode is the part outside ionogen (side upper surface and upper surface) in electrolytic process, directly contact with air, general electrolytic aluminum is in 930～960 ℃ of temperature ranges, so the charcoal in carbon anode is very high with the activity of the air contacting with it, it is very easily oxidized that anode is exposed to airborne part, and result causes the oxidation rate of anode too fast.
Fig. 2 is for being coated with cated anode (grey is illustrated in side upper surface and the upper surface coated of carbon anode), due to the existence of coating, isolated or reduced contacting of carbon anode and air, thereby played the effect of protecting anode.
The application of example 1 CA-50 coating: the formula of coating is in Table 1
The formula of table 1 coating (wt%)
Note: in coating, CA-50 and waste cell melt are 100%, other content is additional
After mixing by the formula of table 1, prepare dry-coated material; through packing; be transported to electrolytic aluminium factory, after adding appropriate water and stirring, make electrolytic aluminum carbon anode supercoat; it is evenly smeared to (or spraying) to upper surface and the side upper surface of carbon anode; smear (or spraying) 1～5 time, coat-thickness 0.2～8mm, coating can form with single coating or compound coating; then dry coating, carry out the production of industrial electrolysis aluminium.
Electrolyzer test result shows: electrolytic process is steady; the anode that adds coating is exposed to airborne part and protects finely; corner angle are clearly demarcated, and the erosion rate of anode is than the anode prolongs life 13-30 hour that does not add coating, and the purity of electrolytic aluminum does not change.
Example 2 CA-60 coatings: the formula of coating is in Table 2
The formula of table 2 coating (wt%)
Note: in coating, CA-60 and waste cell melt are 100%, other content is additional
Formula by table 2 is made coating, the cooling stages of preparing at prebaked anode is evenly smeared this coating (or spraying) to upper surface and the side upper surface of carbon anode, smear (or spraying) 1～5 time, coat-thickness 0.2～8mm, coating can form with single coating or compound coating, then dry coating, carry out the production of industrial electrolysis aluminium.
Electrolyzer test result shows: electrolytic process is steady; the anode that adds coating is exposed to airborne part and protects finely; corner angle are clearly demarcated, and the erosion rate of anode is than the anode prolongs life 13-30 hour that does not add coating, and the purity of electrolytic aluminum does not change.
The application of example 3 CA-70 coatings: the formula of coating is in Table 3
The formula of table 3 coating (wt%)
Note: in coating, CA-70 and waste cell melt are 100%, other content is additional
Formula by table 3 is made coating, the cooling stages of preparing at prebaked anode is evenly smeared this coating (or spraying) to upper surface and the side upper surface of carbon anode, smear (or spraying) 1～5 time, coat-thickness 0.2～8mm, coating can form with single coating or compound coating, then dry coating, carry out the production of industrial electrolysis aluminium.
Electrolyzer test result shows: electrolytic process is steady; the anode that adds coating is exposed to airborne part and protects finely; corner angle are clearly demarcated, and the erosion rate of anode is than the anode prolongs life 13-30 hour that does not add coating, and the purity of electrolytic aluminum does not change.
The application of example 4 CA-80 coatings: the formula of coating is in Table 4; The formula of table 4 water-based coating (wt%)
Note: in coating, CA-80 and waste cell melt are 100%, other content is additional.
Formula by table 4 is made coating, the cooling stages of preparing at prebaked anode is evenly smeared this coating (or spraying) to upper surface and the side upper surface of carbon anode, smear (or spraying) 1～5 time, coat-thickness 0.2～8mm, coating can form with single coating or compound coating, then dry coating, carry out the production of industrial electrolysis aluminium.
Electrolyzer test result shows: electrolytic process is steady; the anode that adds coating is exposed to airborne part and protects finely; corner angle are clearly demarcated, and the erosion rate of anode is than the anode prolongs life 13-30 hour that does not add coating, and the purity of electrolytic aluminum does not change.
Example 5 ρ-Al
2o
3the application of coating: the formula of coating is in Table 5, the formula of table 5 water-based coating (wt%)
Note: in coating, CA-50 and waste cell melt are 100%, other content is additional.
Formula by table 5 is made coating, the cooling stages of preparing at prebaked anode is evenly smeared this coating (or spraying) to upper surface and the side upper surface of carbon anode, smear (or spraying) 1～5 time, coat-thickness 0.2～8mm, coating can form with single coating or compound coating, then dry coating, carry out the production of industrial electrolysis aluminium.
Electrolyzer test result shows: electrolytic process is steady; the anode that adds coating is exposed to airborne part and protects finely; corner angle are clearly demarcated, and the erosion rate of anode is than the anode prolongs life 13-30 hour that does not add coating, and the purity of electrolytic aluminum does not change.
Claims (1)
1. the preparation method of an electrolytic aluminum carbon anode supercoat, it is characterized in that, described method comprises take CA(calcium aluminate) cement is binding agent, the waste cell melt producing in Aluminum Electrolysis Production of take is refractory aggregate, add admixture, after mixing, prepare dry-coated material, through packing, be transported to electrolytic aluminium factory, after adding water and stirring, make electrolytic aluminum carbon anode supercoat, be coated in carbon anode surface, by water-based coating, be coated onto upper surface and the side surface of electrolytic aluminum carbon anode, smear or spray 1～5 time, coat-thickness 0.2～8mm, coating forms with single coating or compound coating, then dry coating, carry out electrolysis, , the waste cell melt producing in its Aluminum Electrolysis Production is refractory aggregate, and the granularity of refractory aggregate is 80-1000 order, and add-on is 80.0-95.0wt%, CA cement comprises CA-50, CA-60, CA-70, CA-80 and ρ-Al2O3, the add-on of CA cement is 5.0-20.0wt%, admixture comprises trisodium phosphate, tripoly phosphate sodium STPP, Sodium hexametaphosphate 99, super sodium polyphosphate, sodium lignosulfonate, calcium lignin sulphonate, the 0.05-1wt% of the useless electrolysis in its add-on station and CA cement content.
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|---|---|---|---|
| CN201410231592.8A CN104005056A (en) | 2014-05-28 | 2014-05-28 | Method for preparing electrolytic aluminium carbon anode protective coating |
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| CN201410231592.8A CN104005056A (en) | 2014-05-28 | 2014-05-28 | Method for preparing electrolytic aluminium carbon anode protective coating |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108315765A (en) * | 2018-04-22 | 2018-07-24 | 新疆大学 | It is a kind of to prepare aluminium electrolysis anode antioxidizing paint using aluminium lime-ash |
| CN108441004A (en) * | 2018-04-20 | 2018-08-24 | 新疆大学 | A kind of apparatus and method preparing aluminium electrolysis anode antioxidizing paint using aluminium lime-ash |
| CN109055990A (en) * | 2018-09-06 | 2018-12-21 | 沈阳化工大学 | It is a kind of to prepare electrolytic aluminium carbon anode protective coating using aluminium ash and aluminium slag |
| WO2021072548A1 (en) * | 2019-10-18 | 2021-04-22 | Laboratoire Cir Inc. | Process for drying anode coating |
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2014
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| US4246035A (en) * | 1979-12-26 | 1981-01-20 | Aluminum Company Of America | High purity mortar suitable for bonding refractory brick |
| US4787965A (en) * | 1986-11-14 | 1988-11-29 | Societe Des Electrodes | Protective coating for the carrier bars of prebaked anodes and the emerging part of said anodes |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108441004A (en) * | 2018-04-20 | 2018-08-24 | 新疆大学 | A kind of apparatus and method preparing aluminium electrolysis anode antioxidizing paint using aluminium lime-ash |
| CN108441004B (en) * | 2018-04-20 | 2023-05-12 | 新疆大学 | Device and method for preparing aluminum electrolysis anode anti-oxidation coating by utilizing aluminum ash |
| CN108315765A (en) * | 2018-04-22 | 2018-07-24 | 新疆大学 | It is a kind of to prepare aluminium electrolysis anode antioxidizing paint using aluminium lime-ash |
| CN109055990A (en) * | 2018-09-06 | 2018-12-21 | 沈阳化工大学 | It is a kind of to prepare electrolytic aluminium carbon anode protective coating using aluminium ash and aluminium slag |
| WO2021072548A1 (en) * | 2019-10-18 | 2021-04-22 | Laboratoire Cir Inc. | Process for drying anode coating |
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Application publication date: 20140827 |