CN106757160A - Low silicon prebaked anode and preparation method thereof - Google Patents
Low silicon prebaked anode and preparation method thereof Download PDFInfo
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- CN106757160A CN106757160A CN201611090639.9A CN201611090639A CN106757160A CN 106757160 A CN106757160 A CN 106757160A CN 201611090639 A CN201611090639 A CN 201611090639A CN 106757160 A CN106757160 A CN 106757160A
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
- C25C3/06—Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
- C25C3/08—Cell construction, e.g. bottoms, walls, cathodes
- C25C3/12—Anodes
- C25C3/125—Anodes based on carbon
Abstract
A kind of low silicon prebaked anode and preparation method thereof, it is related to technical field of aluminum electrolysis in Non-ferrous Metallurgy, the low silicon prebaked anode is to add fluorinated inorganic salt in anode material to be prepared from, the addition of fluorinated inorganic salt is the 0.1%~2% of anode material total amount, anode material includes 82%~86% carbonaceous aggregate and 14%~18% binding agent by mass percentage, the silicone content of the low silicon prebaked anode is controlled in relatively low scope, meets demand of the electrolytic aluminium to high-quality anode；The preparation method is that fluorinated inorganic salt is added in carbonaceous aggregate, is adequately mixed, preheats, then binding agent is added in kneading process, shaping, roasting, obtain final product, the preparation method can reduce the silicone content of obtained prebaked anode, it is controlled in the range of 100ppm~200ppm.
Description
Technical field
The present invention relates to technical field of aluminum electrolysis in a kind of Non-ferrous Metallurgy, and more particularly to a kind of low silicon prebaked anode
And preparation method thereof.
Background technology
One important indicator of electrolytic aluminium liquid production is aluminium liquid quality, and the aluminium liquid of higher degree can have a product to be formed
Good physical and chemical performance, and the more physicochemical property that will certainly influence product of impurity in aluminium liquid, such as influence aluminium alloy is disconnected
Toughness is split, increases the defects such as shrinkage cavity and the shrinkage porosite of ingot casting, reduce aluminium alloy corrosion resisting property, cause aluminium alloy electric conductivity to be deteriorated, in vain
Light reflectivity reduction etc., therefore electrolytic aluminium liquid purity is higher, its use value is higher.Silicon is most common impurity in electrolytic aluminium liquid
Element, is also the essential element for influenceing aluminium liquid quality, and in actual electrolytic aluminium liquid production process, the height of silicone content is to evaluate aluminium
One of important element of liquid quality.In order to improve aluminium liquid quality, the economic benefit of electrolytic aluminium liquid manufacturing enterprise is improved, it is necessary to make
Primary aluminum quality reduces silicone content in aluminium liquid in controlled area charactert.
Need to consume a large amount of carbon materials, particularly prebaked anode in the production process of electrolytic aluminium liquid, therefore, prebaked anode
Quality aluminium liquid quality can be caused have a significant impact：On the one hand, the impurity content in anode body inherently can be to aluminium liquid matter
Amount constitutes influence；On the other hand, if the physical and chemical index of prebaked anode can not meet production requirement, gently then cause anode it is scaling-off,
Crackle, it is heavy then cause electrolytic cell operation conditions deteriorate, so as to in electrolytic cell primary aluminum quality produce have a strong impact on.
Production practices show that the trace element in prebaked anode mainly has：Si, Fe, Na, Ca, V, Ni, Cu, Ga etc., these
Trace element is mainly derived from the raw material (anode scrap that petroleum coke, coal tar pitch, electrolysis are returned) of prebaked anode, and prebaked anode life
Various approach brings into during product.If the micronutrient levels in prebaked anode exceedes certain limit, can be to prebaked anode
Performance and electrolytic aluminium liquid quality produce considerable influence.By the trace element in each raw material for being produced to prebaked anode
It is analyzed, and according to green anode formula, the content of each trace element in prebaked anode can be calculated, wherein, prebaked anode kind
The content of impurity silicon is as shown in table 1.
Each raw material of table 1 brings the impurity silicone content of prebaked anode into
It can be seen from above-mentioned analysis, silicone content is 413.28ppm in prebaked anode, and electrolysis life is carried out using the prebaked anode
Produce, the quality of electrolytic aluminium liquid will be badly influenced, therefore, silicon content gesture is must in control prebaked anode of adopting an effective measure
OK.
The content of the invention
It is an object of the invention to provide a kind of low silicon prebaked anode, silicone content is low, controls in 100~200ppm scopes
It is interior, meet demand of the electrolytic aluminium to high-quality anode.
Another object of the present invention is to provide a kind of preparation method of low silicon prebaked anode, it is possible to decrease silicon therein contains
Amount, makes its control in the range of 100ppm~200ppm, meets demand of the electrolytic aluminium to high-quality prebaked anode.
The present invention is solved its technical problem and is realized using following technical scheme.
The present invention proposes a kind of low silicon prebaked anode, and it is to add fluorinated inorganic salt in anode material to be prepared from, and is pressed
Mass percentage, the addition of fluorinated inorganic salt is the 0.1%~2% of anode material total amount, anode material includes 82%~
86% carbonaceous aggregate and 14%~18% binding agent.
Further, in present pre-ferred embodiments, fluorinated inorganic salt includes cryolite, titanium sodium fluoride, fluoboric acid
At least one in sodium, lithium fluoroborate, aluminum fluoride, sodium fluoride, calcirm-fluoride, magnesium fluoride, lithium fluoride.
Further, in present pre-ferred embodiments, carbonaceous aggregate includes after-smithing petroleum coke and anode scrap, the quality of anode scrap
The 14%~18% of the quality of carbonaceous aggregate is accounted for, the content of ashes of anode scrap is less than 0.5%.
Further, in present pre-ferred embodiments, binding agent includes coal tar pitch and additive, and additive includes epoxy
At least one in resin, phenolic resin, furfural resin, furane resins.
A kind of preparation method of low silicon prebaked anode, it includes procedure below：
Fluorinated inorganic salt is added in carbonaceous aggregate, is sufficiently mixed, is preheated, obtain dry blend；
Dry blend is carried out into kneading, while adding binding agent, thickener is obtained；
Thickener is molded, green compact are obtained, green compact are calcined.
Further, in present pre-ferred embodiments, the temperature of preheating is 160 DEG C~170 DEG C, and the time of mixing is
20min~30min.
Further, in present pre-ferred embodiments, the temperature of kneading is 175 DEG C~185 DEG C, and the time of kneading is
25min~30min.
Further, in present pre-ferred embodiments, the method for shaping is：Thickener is placed in vibration is suppressed in forming machine
Shaping, the time of vibration of forming machine is 90s~120s, 1.4~1.8kg/cm of pressure2。
Further, in present pre-ferred embodiments, the method for roasting is：Green compact are placed in roasting kiln roasting, are roasted
Burn stove technological parameter be：14~16 DEG C/h of heating rate, Baking profile maximum temperature is 1150 DEG C~1250 DEG C, is incubated 60h
~84h.
Further, in present pre-ferred embodiments, the addition manner of fluorinated inorganic salt is：Fluorinated inorganic salt is independent
It is placed in feed bin, is added in kneading pot by conveying worm.
The beneficial effect of the low silicon prebaked anode of the embodiment of the present invention and preparation method thereof is：The low silicon of the embodiment of the present invention
Prebaked anode is to add fluorinated inorganic salt in anode material to be prepared from, and the addition of fluorinated inorganic salt is anode material total amount
0.1%~2%, anode material by mass percentage include 82%~86% carbonaceous aggregate and 14%~18% bonding
Agent, the silicone content of the low silicon prebaked anode is controlled in relatively low scope, meets demand of the electrolytic aluminium to high-quality anode.It is of the invention real
The preparation method for applying the low silicon prebaked anode of example is that fluorinated inorganic salt is added in carbonaceous aggregate, is adequately mixed, preheats, then
Binding agent is added in kneading process, shaping, roasting are obtained final product, and the preparation method can reduce the silicone content of obtained prebaked anode,
It is set to control in the range of 100ppm~200ppm.
Specific embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below will be in the embodiment of the present invention
Technical scheme be clearly and completely described.Unreceipted actual conditions person, builds according to normal condition or manufacturer in embodiment
The condition of view is carried out.Agents useful for same or the unreceipted production firm person of instrument, are the conventional product that can be obtained by commercially available purchase
Product.
Low silicon prebaked anode of the embodiment of the present invention and preparation method thereof is specifically described below.
The embodiment of the present invention provides a kind of low silicon prebaked anode, its be added in anode material fluorinated inorganic salt prepare and
Into the addition of fluorinated inorganic salt is the 0.1%~2% of anode material total amount, and fluorinated inorganic salt preferably includes cryolite
Na3AlF6, titanium sodium fluoride Na2TiF6, sodium fluoborate NaBF4, lithium fluoroborate LiBF4, aluminum fluoride AlF3, sodium fluoride NaF, calcirm-fluoride
CaF2, magnesium fluoride MgF2, lithium fluoride LiF2In at least one.Anode material includes 82%~86% by mass percentage
Carbonaceous aggregate and 14%~18% binding agent.
Wherein, carbonaceous aggregate includes 82%~86% after-smithing petroleum coke, and 14%~18% by mass percentage
Content of ashes less than 0.5% anode scrap, the percentage by weight of each grade material is in after-smithing petroleum coke：Particle diameter is 8mm~5mm
Thick burnt content be 18%~23%, particle diameter for 5mm~2mm middle burnt content be 20%~25%, particle diameter be 2mm~
The thin burnt content of 0.074mm is 25%~30%, and particle diameter is 32%~37% in the ball milling powder content of below 0.074mm.
Binding agent includes coal tar pitch and additive, and additive includes epoxy resin, phenolic resin, furfural resin, furans tree
At least one in fat.
The embodiment of the present invention also provides a kind of preparation method of low silicon prebaked anode, and it includes procedure below：
S1 dispensings：Prepare anode material and fluorinated inorganic salt, by mass percentage, the quality of fluorinated inorganic salt is anode
The 0.1%~2% of raw material total amount, anode material includes 82%~86% carbonaceous aggregate and 14%~18% binding agent.
In the present embodiment, fluorinated inorganic salt preferably includes cryolite Na3AlF6, titanium sodium fluoride Na2TiF6, sodium fluoborate
NaBF4, lithium fluoroborate LiBF4, aluminum fluoride AlF3, sodium fluoride NaF, calcirm-fluoride CaF2, magnesium fluoride MgF2, lithium fluoride LiF2In extremely
Few one kind.
Carbonaceous aggregate includes the anode scrap of after-smithing petroleum coke and content of ashes less than 0.5%, and the quality of anode scrap accounts for carbonaceous bone
The 14%~18% of the quality of material, the percentage by weight of each grade material is in after-smithing petroleum coke：Particle diameter is thick for 8mm~5mm's
Burnt content is 18%~23%, and particle diameter is 20%~25% for the middle burnt content of 5mm~2mm, and particle diameter is 2mm~0.074mm's
Thin Jiao's content is 25%~30%, and particle diameter is 32%~37% in the ball milling powder content of below 0.074mm.
Binding agent includes coal tar pitch and additive, and additive includes epoxy resin, phenolic resin, furfural resin, furans tree
At least one in fat.
S2 mixes：Fluorinated inorganic salt is added in carbonaceous aggregate, is sufficiently mixed, is preheated, obtain dry blend；By dry blend
Kneading is carried out, while adding binding agent kneading, thickener is obtained.Wherein, the temperature of preheating is preferably 160 DEG C~170 DEG C, mixing
Time is preferably 20min~30min；The temperature of kneading is preferably 175 DEG C~185 DEG C, time of kneading be preferably 25min~
30min。
Wherein, the addition manner of fluorinated inorganic salt is：Fluorinated inorganic salt is placed in single feed bin, by helical feed
Machine is added in kneading pot, is specifically incorporated under thin Jiao's (2mm~0.074mm) feed opening and ball milling powder (below 0.074mm)
In the middle of material mouth, it is sufficiently mixed with the carbonaceous aggregate in kneading pot.
S3 shaping and roastings：Thickener is molded, green compact are obtained, green compact are calcined, obtain pre-baked anode carbon blocks, i.e., low silicon prebake
Anode.
Wherein, the method for shaping is：Thickener is placed in vibration moulding is suppressed in forming machine, the time of vibration of forming machine is
90s~120s, 1.4~1.8kg/cm of pressure2。
The method of roasting is：Green compact are placed in roasting kiln roasting, the technological parameter of roaster is：Heating rate 14~16
DEG C/h, Baking profile maximum temperature is 1150 DEG C~1250 DEG C, is incubated 60h~84h.
Using the preparation method of the low silicon prebaked anode of the embodiment of the present invention, the element silicon in prebaked anode can be effectively reduced
Content, is primarily due to the doped fluor-containing inorganic salts in anode material, plays modifying function.
The reduction mechanism of Si contents is in the low silicon prebaked anode that doped fluor-containing inorganic salts are obtained in the anode material：Green compact
In high-temperature calcination process, the fluorinated inorganic salt of doping can at high temperature occur hydrolysis in anode material, produce hydrogen fluoride
Gas and corresponding metal oxide, fluoride salt hydrolysis formula are as follows：
F-+H2O=HF+OH-；
Wherein, the hydrolysis formula of sodium fluoborate is：
NaBF4+3H2O=NaF+B (OH)3+3HF；
The HF of generation in any condition can be with the SiO in anode material2React, produce SiF4Gaseous volatilization falls,
So as to reduce the Si contents in the low silicon prebaked anode for obtaining.
For example, the reduction mechanism of Si contents is in the low silicon prebaked anode that obtains of the aluminum fluoride that adulterates in the anode material：
2/3AlF3+H2O (g)=2HF (g)+1/3Al2O3(α) ①
4HF+SiO2=SiF4+2H2O ②
As Δ G0(T) when≤0,1. reaction is carried out from left to right, AlF3Start hydrolysis, by Δ G0 (T)=131151.5-
125.3893 (T) can obtain minimum temperature T >=1046K (773 DEG C) that reaction is carried out, and temperature exists during the roasting of prebaked anode
More than 1000 DEG C, there is AlF in deducibility3Hydrolysis.The HF that 1. produces of reaction in any condition all can with anode material in
SiO2React, produce SiF4Gaseous volatilization falls.Therefore, in the doping low silicon prebaked anode that obtains of aluminum fluoride Si contents compared with
It is low.
Feature of the invention and performance are described in further detail with reference to embodiments.
Embodiment 1
Embodiment 1 provides a kind of low silicon prebaked anode, and it uses following preparation process to obtain：
Prepare raw material：The 100kg carbonaceous aggregate (anode scrap by 83kg after-smithing petroleum cokes and+17kg contents of ashes less than 0.5%
Composition, percentage by weight shared by each grade material is wherein in after-smithing petroleum coke：8mm~5mm is for 20%, 5mm~2mm
22%, 2mm~0.074mm are 25%, and below 0.074mm is for 35%)；19kg binding agents are (by coal tar pitch and phenolic resin group
Into)；0.952kg aluminum fluorides (account for the 0.8% of carbonaceous aggregate and bonding agent total amount).
Aluminum fluoride is added in carbonaceous aggregate, is mixed by 25min, be preheated to 180 DEG C, obtain dry blend；Will be dry-mixed
Material kneading 30min at 175 DEG C, while adding binding agent, obtains thickener.
Thickener is placed in vibration moulding is suppressed in forming machine, time of vibration is 100s, pressure 1.6kg/cm2, green compact are obtained,
Green compact are positioned in roaster and are calcined, 15 DEG C/h of heating rate, Baking profile maximum temperature is 1150 DEG C, is incubated 72h,
Come out of the stove after cooling, obtain low silicon prebaked anode.
The silicone content in the low silicon prebaked anode is analyzed, shows that silicone content therein is 141ppm.
Embodiment 2
Embodiment 2 provides a kind of low silicon prebaked anode, and it uses following preparation process to obtain：
Prepare raw material：The 100kg carbonaceous aggregate (anode scrap by 84kg after-smithing petroleum cokes and+16kg contents of ashes less than 0.5%
Composition, percentage by weight shared by each grade material is wherein in after-smithing petroleum coke：8mm~5mm is for 20%, 5mm~2mm
22%, 2mm~0.074mm are 25%, and below 0.074mm is for 35%)；19kg binding agents are (by coal tar pitch and epoxy resin group
Into)；1.19kg cryolite (accounts for the 1% of carbonaceous aggregate and bonding agent total amount).
Cryolite is added in carbonaceous aggregate, is mixed by 25min, be preheated to 165 DEG C, obtain dry blend；Will be dry
Batch mixing kneading 30min at 180 DEG C, while adding binding agent, obtains thickener.
Thickener is placed in vibration moulding is suppressed in forming machine, time of vibration is 110s, pressure 1.6kg/cm2, green compact are obtained,
Green compact are positioned in roaster and are calcined, 15 DEG C/h of heating rate, Baking profile maximum temperature is 1200 DEG C, is incubated 72h,
Come out of the stove after cooling, obtain low silicon prebaked anode.
The silicone content in the low silicon prebaked anode is analyzed, shows that silicone content therein is 118ppm.
Embodiment 3
Embodiment 3 provides a kind of low silicon prebaked anode, and it uses following preparation process to obtain：
Prepare raw material：The 100kg carbonaceous aggregate (anode scrap by 84kg after-smithing petroleum cokes and+16kg contents of ashes less than 0.5%
Composition, percentage by weight shared by each grade material is wherein in after-smithing petroleum coke：8mm~5mm is for 20%, 5mm~2mm
22%, 2mm~0.074mm are 25%, and below 0.074mm is for 35%)；20kg binding agents are (by coal tar pitch and furane resins group
Into)；0.6kg lithium fluoride (accounts for the 0.5% of carbonaceous aggregate and bonding agent total amount).
Lithium fluoride is added in carbonaceous aggregate, is mixed by 25min, be preheated to 170 DEG C, obtain dry blend；Will be dry-mixed
Material kneading 30min at 185 DEG C, while adding binding agent, obtains thickener.
Thickener is placed in vibration moulding is suppressed in forming machine, time of vibration is 105s, pressure 1.6kg/cm2, green compact are obtained,
Green compact are positioned in roaster and are calcined, 15 DEG C/h of heating rate, Baking profile maximum temperature is 1150 DEG C, is incubated 72h,
Come out of the stove after cooling, obtain low silicon prebaked anode.
The silicone content in the low silicon prebaked anode is analyzed, shows that silicone content therein is 172ppm.
Embodiment 4
Embodiment 4 provides a kind of low silicon prebaked anode, and it uses following preparation process to obtain：
Prepare raw material：The 100kg carbonaceous aggregate (anode scrap by 83kg after-smithing petroleum cokes and+17kg contents of ashes less than 0.5%
Composition, percentage by weight shared by each grade material is wherein in after-smithing petroleum coke：8mm~5mm is for 20%, 5mm~2mm
23%, 2mm~0.074mm are 24%, and below 0.074mm is for 33%)；19kg binding agents are (by coal tar pitch and phenolic resin, furans
Resin is constituted)；1.428kg sodium fluoborates (account for the 1.2% of carbonaceous aggregate and bonding agent total amount).
Sodium fluoborate is added in carbonaceous aggregate, is mixed by 25min, be preheated to 175 DEG C, obtain dry blend；Will be dry
Batch mixing kneading 30min at 185 DEG C, while adding binding agent, obtains thickener.
Thickener is placed in vibration moulding is suppressed in forming machine, time of vibration is 100s, pressure 1.65kg/cm2, given birth to
Base, green compact is positioned in roaster and is calcined, 15 DEG C/h of heating rate, and Baking profile maximum temperature is 1200 DEG C, insulation
72h, comes out of the stove after cooling, obtains low silicon prebaked anode.
The silicone content in the low silicon prebaked anode is analyzed, shows that silicone content therein is 135ppm.
Embodiment 5
Embodiment 5 provides a kind of low silicon prebaked anode, and it uses following preparation process to obtain：
Prepare raw material：The 100kg carbonaceous aggregate (anode scrap by 82kg after-smithing petroleum cokes and+18kg contents of ashes less than 0.5%
Composition, percentage by weight shared by each grade material is wherein in after-smithing petroleum coke：8mm~5mm is that 21%, 5mm~2mm is
22%, 2mm~0.074mm are 23%, and below 0.074mm is for 34%)；19.6kg binding agents are (by coal tar pitch and furfural resin group
Into)；0.598kg aluminum fluorides (accounting for the 0.5% of carbonaceous aggregate and bonding agent total amount) and 0.478kg magnesium fluorides (account for carbonaceous aggregate and
Bonding agent total amount 0.4%).
Aluminum fluoride and magnesium fluoride are added in carbonaceous aggregate, are mixed by 20min, be preheated to 170 DEG C, obtain dry-mixed
Material；By dry blend at 180 DEG C kneading 25min, while add binding agent, obtain thickener.
Thickener is placed in vibration moulding is suppressed in forming machine, time of vibration is 100s, pressure 1.6kg/cm2, green compact are obtained,
Green compact are positioned in roaster and are calcined, 15 DEG C/h of heating rate, Baking profile maximum temperature is 1150 DEG C, is incubated 72h,
Come out of the stove after cooling, obtain low silicon prebaked anode.
The silicone content in the low silicon prebaked anode is analyzed, shows that silicone content therein is 102ppm.
Comparison of test results is analyzed：
Comparative example 1
Comparative example 1 provides a kind of prebaked anode, and its preparation method is roughly the same with the preparation process of embodiment 1, difference
Place is：Without addition aluminum fluoride, prebaked anode is finally obtained.
Comparative example 2- comparative examples 5
Comparative example 2- comparative examples 5 provide a kind of prebaked anode respectively, and its preparation method is corresponded to respectively to be implemented with embodiment 2-
The preparation process of example 5 is roughly the same, and difference is：Without addition fluorinated inorganic salt, prebaked anode is finally obtained.
Silicon in the low silicon prebaked anode of embodiment 1- embodiments 5, with the prebaked anode of comparative example 1- comparative examples 5 is contained
Amount, analysis result is as follows：
Silicone content in the low silicon prebaked anode of the embodiment of table 2 and the prebaked anode of comparative example
| Silicone content | 1 | 2 | 3 | 4 | 5 |
| Comparative example | 398ppm | 351ppm | 430ppm | 376ppm | 349ppm |
| Embodiment | 141ppm | 118ppm | 172ppm | 135ppm | 102ppm |
As can be seen from the above table, the silicone content in the low silicon prebaked anode of the embodiment of the present invention is controlled in 100~200ppm models
In enclosing, and silicone content in low silicon prebaked anode in each embodiment is significantly lower than in the prebaked anode in corresponding comparative example
Silicone content, illustrate the silicone content that can be significantly reduced in prebaked anode using preparation method of the present invention, meet electrolytic aluminium to high-quality
The demand of prebaked anode.
In sum, the preparation method of the low silicon prebaked anode of the embodiment of the present invention can reduce silicone content therein, obtained
The silicone content of low silicon prebaked anode is low, controls in the range of 100~200ppm, meets need of the electrolytic aluminium to high-quality prebaked anode
Ask.
Embodiments described above is a part of embodiment of the invention, rather than whole embodiments.Reality of the invention
The detailed description for applying example is not intended to limit the scope of claimed invention, but is merely representative of selected implementation of the invention
Example.Based on the embodiment in the present invention, what those of ordinary skill in the art were obtained under the premise of creative work is not made
Every other embodiment, belongs to the scope of protection of the invention.
Claims (10)
1. a kind of low silicon prebaked anode, it is characterised in that it is to add fluorinated inorganic salt in anode material to be prepared from, by matter
Amount percentage meter, the addition of the fluorinated inorganic salt is the 0.1%~2% of the anode material total amount, the anode material
Including 82%~86% carbonaceous aggregate and 14%~18% binding agent.
2. low silicon prebaked anode according to claim 1, it is characterised in that the fluorinated inorganic salt include cryolite,
At least one in titanium sodium fluoride, sodium fluoborate, lithium fluoroborate, aluminum fluoride, sodium fluoride, calcirm-fluoride, magnesium fluoride, lithium fluoride.
3. low silicon prebaked anode according to claim 1, it is characterised in that the carbonaceous aggregate include after-smithing petroleum coke and
Anode scrap, the quality of the anode scrap accounts for the 14%~18% of the quality of the carbonaceous aggregate, and the content of ashes of the anode scrap is less than
0.5%.
4. low silicon prebaked anode according to claim 1, it is characterised in that the binding agent includes coal tar pitch and addition
Agent, the additive includes at least one in epoxy resin, phenolic resin, furfural resin, furane resins.
5. a kind of preparation method for manufacturing low silicon prebaked anode as claimed in claim 1, it is characterised in that it includes following mistake
Journey：
The fluorinated inorganic salt is added in the carbonaceous aggregate, is sufficiently mixed, is preheated, obtain dry blend；
The dry blend is carried out into kneading, while adding the binding agent, thickener is obtained；
By thickener shaping, green compact are obtained, by green compact roasting.
6. the preparation method of low silicon prebaked anode according to claim 5, it is characterised in that the temperature of the preheating is
160 DEG C~170 DEG C, the time of the mixing is 20min~30min.
7. the preparation method of low silicon prebaked anode according to claim 5, it is characterised in that the temperature of the kneading is
175 DEG C~185 DEG C, the time of the kneading is 25min~30min.
8. the preparation method of low silicon prebaked anode according to claim 5, it is characterised in that the method for the shaping is：
The thickener is placed in vibration moulding is suppressed in forming machine, the time of vibration of the forming machine is 90s~120s, pressure 1.4~
1.8kg/cm2。
9. the preparation method of low silicon prebaked anode according to claim 5, it is characterised in that the method for the roasting is：
The green compact are placed in roasting kiln roasting, the technological parameter of the roaster is：14~16 DEG C/h of heating rate, Baking profile
Maximum temperature is 1150 DEG C~1250 DEG C, is incubated 60h~84h.
10. the preparation method of low silicon prebaked anode according to claim 5, it is characterised in that the fluorinated inorganic salt
Addition manner is：Fluorinated inorganic salt is individually placed in feed bin, is added in kneading pot by conveying worm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110219019A (en) * | 2019-07-22 | 2019-09-10 | 广东汉合有色金属有限公司 | A kind of diaphragm electrolysis technique of tin copper ashes |
| CN115974556A (en) * | 2022-12-09 | 2023-04-18 | 中国铝业股份有限公司 | Preparation method of low-slag-loss prebaked anode and low-slag-loss prebaked anode |
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