AU2021100249A4 - Preparation of Aluminium Electrolytic Anode Coating by Utilizing Waste Aluminium Dross - Google Patents
Preparation of Aluminium Electrolytic Anode Coating by Utilizing Waste Aluminium Dross Download PDFInfo
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- AU2021100249A4 AU2021100249A4 AU2021100249A AU2021100249A AU2021100249A4 AU 2021100249 A4 AU2021100249 A4 AU 2021100249A4 AU 2021100249 A AU2021100249 A AU 2021100249A AU 2021100249 A AU2021100249 A AU 2021100249A AU 2021100249 A4 AU2021100249 A4 AU 2021100249A4
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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
- C25C7/00—Constructional parts, or assemblies thereof, of cells; Servicing or operating of cells
- C25C7/02—Electrodes; Connections thereof
- C25C7/025—Electrodes; Connections thereof used in cells for the electrolysis of melts
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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
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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
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- Chemical Kinetics & Catalysis (AREA)
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- Organic Chemistry (AREA)
- Electrolytic Production Of Metals (AREA)
Abstract
The invention discloses a preparation of aluminium electrolytic anode coating using
waste aluminium dross. The formula component includes hydrated lime, calcium
aluminate, dry matter from electrolysis-dehydration of aluminium dross aqueous solution
(a mixture of sodium aluminate and potassium metaaluminate), alumina, sodium
tripolyphosphate and other components. Specifically, the mass percentage of each
component is 5%-15% hydrated lime + 10%-2 5 % calcium aluminate + 15%-7 0% dry
matter + 1%- 3 % sodium tripolyphosphate + industrial alumina.
The preparation of aluminium electrolytic anode coating from aluminium dross is divided
into two stages. The first stage is the preparation of aluminium dross and the second stage
is the batching treatment of anode anti-oxidation coating.
The first stage specifically includes the following steps. Weigh aluminium dross and
composition analysis. Aluminium dross is dissolved in water and hydrolysed, and direct
current is applied to the salt solution, so that NaCl and KCl in the salt are electrolyzed to
prepare NaOH and KOH. The nanometer NaOH and KOH can directly dissolve the
precipitated aluminium and alumina at the bottom of the electrolyser. After removing iron
and silicon from the solution, press filtration treatment is carried out. The main
components of the filter residue are iron oxide and calcium orthosilicate, which are sent
to the storage yard; the filtrate is sodium aluminate and potassium metaaluminate. The
sodium aluminate filtrate is evaporated to obtain the dry matter of the mixture of sodium
aluminate and potassium metaaluminate, which is then as a raw material for preparing
aluminium electrolytic anode coating.
The second stage includes the following steps. Weighing hydrated lime, calcium
aluminate, dry matter mixture of sodium aluminate and potassium metaaluminate, sodium
tripolyphosphate, and industrial alumina according to the requirements of the formula
ratio. The mixture is mixed and ball-milled to 100-500 meshes. After passing the
inspection, it is packaged and stored as the finished product of anodized anti-oxidation
coating.
The invention uses aluminium dross to prepare aluminium electrolytic anode coating and
realizes the purpose of recycling the waste and environmentally polluting aluminium
dross. The aluminium electrolytic anode coating prepared by the aluminium dross of the
present invention is automatically sintered into a firm protective shell under the
conditions of the electrolysis process, and the oxidation effect of oxygen in the
atmosphere on the high-temperature carbon anode is blocked. As the anode is consumed,
the coating shell components gradually dissolve in the electrolyte, and the main
components are converted into calcium fluoride, sodium fluoride, and alumina, which are
raw materials and fluoride salt additives required for electrolytic production. The anode
coating also has the advantages of reducing anode carbon oxidation consumption,
prolonging the life cycle of anode carbon blocks, reducing the amount of raw materials
used for electrolytic production of alumina, calcium fluoride, sodium fluoride and the
like, and achieving the effect of reducing production costs.
-1/1
Weigh aluminium dross and composition analysis
Watersoluble and hydrolysis
Direct currentelectrolysis
The first stage
Removing ron and silicon from the solution treatment faste
aluminium dross
Sending iro sa fd silio
press filtration treatment ding ronslag storage yard
The filtrate is dehydrated by distillation
Dry matter, mixture of sodium aluminate and potassium
metaaluminate
6-------------------------------------------
Weighing materials based on the hydratedlime, sodium tripolyplphate
reurements of the formula ratio ad alumina
M ix, ball-mil linlg and sieving I The second stage
1M--- batching of anode
anti-oxidation coating
Aluminium electrolytic anode anti-oxidation coating
Package and storage
L------------------------------------------------------------ J
Fig. 1
The process flow of preparing aluminium electrolytic anode anti-oxidation coating with
waste aluminium dross.
Description
The second stage includes the following steps. Weighing hydrated lime, calcium
aluminate, dry matter mixture of sodium aluminate and potassium metaaluminate, sodium
tripolyphosphate, and industrial alumina according to the requirements of the formula
ratio. The mixture is mixed and ball-milled to 100-500 meshes. After passing the
inspection, it is packaged and stored as the finished product of anodized anti-oxidation
coating.
The invention uses aluminium dross to prepare aluminium electrolytic anode coating and
realizes the purpose of recycling the waste and environmentally polluting aluminium
dross. The aluminium electrolytic anode coating prepared by the aluminium dross of the
present invention is automatically sintered into a firm protective shell under the
conditions of the electrolysis process, and the oxidation effect of oxygen in the
atmosphere on the high-temperature carbon anode is blocked. As the anode is consumed,
the coating shell components gradually dissolve in the electrolyte, and the main
components are converted into calcium fluoride, sodium fluoride, and alumina, which are
raw materials and fluoride salt additives required for electrolytic production. The anode
coating also has the advantages of reducing anode carbon oxidation consumption,
prolonging the life cycle of anode carbon blocks, reducing the amount of raw materials
used for electrolytic production of alumina, calcium fluoride, sodium fluoride and the
like, and achieving the effect of reducing production costs.
-1/1 Weigh aluminium dross and composition analysis
Watersoluble and hydrolysis
Direct currentelectrolysis
The first stage Removing ron and silicon from the solution treatment faste aluminium dross
Sending iro sa fd silio press filtration treatment ding ronslag storage yard
The filtrate is dehydrated by distillation
Dry matter, mixture of sodium aluminate and potassium metaaluminate
6-------------------------------------------
Weighing materials based on the hydratedlime, sodium tripolyplphate reurements of the formula ratio ad alumina
M ix, ball-mil linlg and sieving I The second stage 1M--- batching of anode anti-oxidation coating
Aluminium electrolytic anode anti-oxidation coating
Package and storage L------------------------------------------------------------ J
Fig. 1
The process flow of preparing aluminium electrolytic anode anti-oxidation coating with
waste aluminium dross.
Preparation of Aluminium Electrolytic Anode Coating by Utilizing Waste
Aluminium Dross
The invention relates to the field of aluminium electrolysis carbon anode protection and
comprehensive utilization of waste aluminium dross resources, in particular to a
preparation of aluminium electrolysis anode coating by utilizing waste aluminium dross.
Aluminium electrolysis is a molten salt electrolysis process with carbon material as the
anode. At present, for every ton of metal aluminium produced, 333.3 kg of carbon
material is theoretically consumed, and the actual consumption of carbon material is
about 450 kg/t of aluminium. The threshing, lumps and oxidative combustion of the
anode during use are the main reasons for the increase in the consumption of carbon
materials. Among them, the anodic oxidation burning loss is due to the carbon block
being exposed to the atmosphere, and the high-temperature carbon oxidizes with oxygen
and carbon dioxide in the air, resulting in carbon consumption. The aluminium
electrolysis temperature is around 960 °C. During the production of aluminium
electrolysis, because the anode carbon material is directly exposed to the atmosphere, the
high-temperature carbon material contacts, oxidizes, and burns with oxygen in the air,
resulting in an empty consumption of the carbon material, which is an important factor
that affects the consumption of carbon material higher than the theoretical consumption
the reason. After calculation, for every ton of aluminium produced, the added value of
carbon material consumption due to anodic oxidation is about 10-20 kg/t Al. According to
the calculation of my country's annual production of 33 million tons of electrolytic aluminium, the added value of carbon material consumption caused by anode oxidation and combustion due to contact with air is about 495,000 tons.
Aluminium dross is a by-product of aluminium and aluminium alloy casting process. In
2016, during the process of aluminium and aluminium alloy casting in my country, about
4.46 million tons of aluminium dross was produced. The chemical composition of
aluminium dross is metal aluminium, fluoride salt, chloride salt, alumina, aluminium
nitride, aluminium carbide, and metal oxides such as silicon, iron, magnesium,
manganese, zinc, and copper. At present, the domestic and foreign recycling of
aluminium dross only stays at the stage of recycling the massive metallic aluminium in
the primary aluminium dross. The fine metal aluminium particles, which account for
about 20% of the mass of aluminium slag, and the alumina resources, which account for
about 40%- 5 0% of the mass of aluminium slag, have not yet been effectively recycled.
This part of aluminium dross resources is often landfilled or discarded, which wastes
resources and pollutes the environment.
The purpose of the present invention is to provide a method for preparing aluminium
electrolytic anode coating by using waste aluminium dross in response to the above
mentioned shortcomings of the prior art.
The above purpose is achieved through the following schemes.
A method for preparing aluminium electrolytic anode coating by using waste aluminium
dross is characterized in that the composition of the anode anti-oxidation coating is
composed of hydrated lime, calcium aluminate, dry matter from electrolysis-dehydration of aluminium dross aqueous solution (a mixture of sodium aluminate and potassium metaaluminate), alumina, sodium tripolyphosphate and other components.
According to the composition of the above-mentioned anodic coating formulation, it is
characterized in that the composition of the anodic anti-oxidation coating formulation is
as follows: 5%-15% hydrated lime + 10%- 2 5 % calcium aluminate + 15%- 7 0% dry matter
+ 1%- 3 % sodium tripolyphosphate + industrial alumina.
An invention for preparing aluminium electrolytic anode coating using waste aluminium
dross is characterized in that the preparation of the anodic anti-oxidation coating is
divided into two stages. Wherein, the first stage is the preparation of aluminium dross and
the second stage is the anodic anti-oxidation coating ingredients processing.
According to the above-mentioned use of waste aluminium dross to prepare aluminium
electrolytic anode coating, the first stage aluminium dross preparation process is as
follows:
Weigh a certain mass of aluminium dross and analyse the content of aluminium and
alumina in the aluminium dross. Add aluminium dross into the electrolytic cell, add
enough water to fully dissolve the salt-containing components (chlorine salt, fluoride
salt), fully hydrolyse aluminium nitride, and convert aluminium in aluminium nitride and
aluminium carbide into oxidation aluminium. The aluminium, alumina, iron oxide, and
silicon oxide in the generated alumina and aluminium dross are deposited on the bottom
of the electrolyser. The hydrolysis reaction of aluminium nitride and aluminium carbide is
as follows:
2AlN+3H20--Al203+2NH3
A14C3+6H20--2Al203+3CH4t
Direct current is applied to the salt solution, and NaCl and KCl in the salt component are
electrolyzed to prepare NaOH and KOH. The electrolysis reaction of salt is as follows:
2NaCl+ 2H20 --* 2NaOH + H27 + Cl27
2KC1+ 2H20 --* 2KOH + H27 + Cl27
Use the nano NaOH and KOH prepared by electrolysis to directly dissolve the
precipitated aluminium and alumina at the bottom of the electrolyser, thereby preparing a
mixed solution of sodium aluminate and potassium metaaluminate: Mixed solution of
sodium and potassium metaaluminate:
NaOH + Al -- Na20 -A1203+ H27
KOH + Al -> K20-A1203+ H27T
NaOH + A1203 -- Na20 -A1203+ H20
KOH + A1203 -> K20 -A1203+ H20
After removing iron and silicon from the solution, press filter treatment is performed. The
main components of the filter residue are iron oxide and calcium orthosilicate, which are
sent to the storage yard; the filtrate is sodium aluminate and potassium metaaluminate.
The sodium aluminate filtrate is evaporated to obtain the dry matter, a mixture of sodium
aluminate and potassium metaaluminate, which is then as a raw material for preparing
aluminium electrolytic anode coating material.
According to the above-mentioned use of waste aluminium dross to prepare aluminium
electrolytic anode coating, the second-stage anode anti-oxidation coating batching
process is as follows
According to the formula of aluminium electrolytic anode coating ingredients, weigh
hydrated lime, calcium aluminate, dry matter, sodium tripolyphosphate, and industrial alumina according to the proportion requirements. The mixture is charged into a mixing and ball milling device for mixing and ball milling. The ball-milled product is sieved with
100-500 meshes. The coarse particles on the sieve are returned to the mixing and ball
milling device. The fine particles under the sieve are inspected, packaged, and put into
storage. The treatment process is shown in Figure 1.
The aluminium electrolytic anode coating prepared by the use of waste aluminium dross
of the present invention can use waste aluminium dross resources as raw materials to
recycle aluminium, alumina, and salt resources in the waste aluminium slag, thereby
realizing the purpose of recycling the waste and environmentally polluting aluminium
dross. The invention uses waste aluminium dross to prepare aluminium electrolytic anode
coating, which is automatically sintered into a firm protective shell under electrolytic
process conditions, provides excellent protection for carbon anodes, and blocks the effect
of atmospheric oxygen on high-temperature carbon anodes. oxidation. As the anode is
consumed, the coating shell components gradually dissolve in the electrolyte, and their
components do not change the electrolyte composition and do not affect the existing
electrolysis process. The main components are converted into calcium fluoride, sodium
fluoride, and alumina. These components can participate in the aluminium electrolysis
reaction and are the raw materials and fluoride salt additives required for electrolysis
production. The anode coating has the advantages of recycling waste aluminium dross,
reducing anode carbon oxidation consumption, prolonging the life of anode carbon block,
reducing the amount of raw materials used for electrolytic production of alumina, calcium
fluoride, sodium fluoride, etc., thereby reducing production costs.
Figure 1 is the process flow of preparing aluminium electrolytic anode anti-oxidation
coating with waste aluminium dross.
The invention discloses a preparation of aluminium electrolytic anode coating by using
waste aluminium dross. The formula component is dry matter from electrolysis
dehydration of aluminium dross aqueous solution (a mixture of sodium aluminate and
potassium metaaluminate), alumina, sodium tripolyphosphate and other components.
According to the above-mentioned use of waste aluminium dross to prepare the anodic
anti-oxidation coating formula components, the formula mass percentage composition is
%-15% hydrated lime + 10%- 2 5 % calcium aluminate + 15%- 7 0% dry matter + 1%- 3
% sodium tripolyphosphate + industrial alumina
An invention for preparing aluminium electrolytic anode coating using waste aluminium
dross. The preparation of the anode anti-oxidation coating is divided into two stages. The
first stage is the preparation of aluminium dross, and the second stage is the batching
processing of the anode anti-oxidation coating.
According to the above-mentioned use of waste aluminium dross to prepare aluminium
electrolytic anode coating, the first stage aluminium dross preparation process is as
follows:
Weigh a certain quality of aluminium slag and analyse the aluminium and alumina
content in the aluminium slag. Add aluminium dross into the electrolytic cell, add enough
water to fully dissolve the salt-containing components (chlorine salt, fluoride salt), fully
hydrolyse aluminium nitride, and convert aluminium in aluminium nitride and aluminium carbide into oxidation Aluminium, alumina, alumina, iron oxide, and silicon oxide in the generated alumina and aluminium dross are deposited on the bottom of the electrolyser.
The hydrolysis reaction of aluminium nitride and aluminium carbide is as follows:
2AlN + 3H20-- Al203+ 2NH3
A14C3+ 6H20-- 2Al203+3CH 4 t
Direct current is applied to the salt solution, and NaCl and KCl in the salt component are
electrolyzed to prepare NaOH and KOH. The electrolysis reaction of salt is as follows:
2NaCl+ 2H20-- 2NaOH + H27 + Cl27
2KC1+ 2H20-- 2KOH + H27 + Cl27
Use the nano NaOH and KOH prepared by electrolysis to directly dissolve the
precipitated aluminium and alumina at the bottom of the electrolyser, and prepare a
mixed solution of sodium aluminate and potassium metaaluminate:
NaOH + Al -- Na20-Al203+H27
KOH + Al-- K20-A1203+ H27
NaOH + A1203-- Na20-Al203+H20
KOH+Al203-> K20-Al203+H20
After removing iron and silicon from the solution, press filter treatment is performed. The
main components of the filter residue are iron oxide and calcium orthosilicate, which are
sent to the storage yard; the filtrate is sodium aluminate and potassium metaaluminate.
The sodium aluminate filtrate is evaporated to obtain the dry matter, a mixture of sodium
aluminate and potassium metaaluminate, as a raw material for preparing aluminium
electrolytic anode coating material.
The second-stage anodic anti-oxidation coating ingredients processing process is as
follows.
Weigh hydrated lime, calcium aluminate, dry matter mixture of sodium aluminate and
potassium metaaluminate, sodium tripolyphosphate, and industrial alumina based on the
requirements of the formula ratio. The mixture is charged into a mixing and ball milling
device for mixing and ball milling. The ball-milled product is sieved with 100-500
meshes. The coarse particles on the sieve are returned to the mixing and ball milling
device. The fine particles under the sieve are inspected, packaged, and put into storage.
The treatment process is shown in Fig. 1, a process flow of preparing aluminium
electrolytic anode coating with waste aluminium dross.
Embodiment 1
Weigh 10,000 kg of aluminium slag and analyse the aluminium and alumina content in
the aluminium slag. Add aluminium dross into the electrolytic cell, add sufficient water to
fully dissolve the salt-containing components (chlorine salt, fluorine salt), and fully
hydrolyse the aluminium nitride.
Direct current is applied to the salt solution, and NaCl and KCl in the salt component are
electrolyzed to prepare NaOH and KOH. The nano NaOH and KOH prepared by the
solution directly dissolve the precipitated aluminium and alumina at the bottom of the
electrolyser. After removing iron and silicon from the solution, press filter treatment is
performed. The main components of the filter residue are iron oxide and calcium
orthosilicate, which are sent to the storage yard; the filtrate is sodium aluminate and
potassium metaaluminate. The sodium aluminate filtrate is evaporated to obtain the dry matter, a mixture of sodium aluminate and potassium metaaluminate as a raw material for preparing aluminium electrolytic anode coating material.
The aluminium electrolytic anode coating is prepared according to the following mass
percentage composition: 5% hydrated lime + 10% calcium aluminate + 70% sodium
aluminate dry matter prepared from aluminium dross +1% sodium tripolyphosphate + the
balance is industrial alumina.
The mixture is loaded into a mixing and ball milling device for mixing and ball milling.
The ball-milled product is sieved through 100-500 meshes. The coarse particles on the
sieve are returned to the mixing and ball milling device. The fine particles under the sieve
are tested and qualified as aluminium dross. Packaging and storage of finished aluminium
electrolytic anode coatings.
Embodiment 2
Weigh 10,000 kg of aluminium dross and analyse the aluminium and alumina content in
the aluminium dross. Add aluminium dross into the electrolytic cell, add sufficient water
to fully dissolve the salt-containing components (chlorine salt, fluorine salt), and fully
hydrolyse the aluminium nitride.
Direct current is applied to the salt solution, and NaCl and KCl in the salt component are
electrolyzed to prepare NaOH and KOH. The nano NaOH and KOH prepared by the
solution are used to directly dissolve the precipitated aluminium and alumina at the
bottom of the electrolyser, and the solution is subjected to pressure filtration after iron
and silicon removal. The main components of the filter residue are iron oxide and
calcium orthosilicate, which are sent to the storage yard; the filtrate is sodium aluminate
and potassium metaaluminate. The sodium aluminate filtrate is evaporated to obtain the dry matter, a mixture of sodium aluminate and potassium metaaluminate as a raw material for preparing aluminium electrolytic anode coating material.
The aluminium electrolytic anode coating is prepared according to the following mass
percentage composition: 15% hydrated lime + 10% calcium aluminate + 30% sodium
aluminate dry matter prepared from aluminium dross + 3% sodium tripolyphosphate
+ the balance is industrial alumina.
The mixture is put into a mixing and ball milling device for mixing and ball milling, and
the ball-milled product is sieved through 100-500 mesh. The coarse particles on the sieve
are returned to the mixing and ball milling device, and the fine particles under the sieve
are qualified after inspection and used as aluminium dross to prepare aluminium
electrolytic anode coating finished product packaging and storage.
Embodiment 3
Weigh 10,000 kg of aluminium dross and analyse the aluminium and alumina content in
the aluminium dross. Add aluminium dross into the electrolytic cell, add sufficient water
to fully dissolve the salt-containing components (chlorine salt, fluorine salt), and fully
hydrolyse the aluminium nitride.
Direct current is applied to the salt solution, and NaCl and KCl in the salt component are
electrolyzed to prepare NaOH and KOH. The nanometer NaOH and KOH prepared by
the solution directly dissolve the precipitated aluminium and alumina at the bottom of the
electrolyser: after removing iron and silicon from the solution, pressure filtration is
performed. The main components of the filter residue are iron oxide and calcium
orthosilicate, which are sent to the storage yard; the filtrate is sodium aluminate and
potassium metaaluminate. The sodium aluminate filtrate is evaporated to obtain the dry matter, a mixture of sodium aluminate and potassium metaaluminate as a raw material for preparing aluminium electrolytic anode coating material.
The mixture is loaded into and treated by a mixing and ball milling device. The ball
milled product is sieved through 100-500 meshes. The coarse particles on the sieve are
returned to the mixing and ball milling device. The fine particles under the sieve are
tested and qualified as aluminium dross. Packaging and storage of finished aluminium
electrolytic anode coatings.
The mixture is put into a mixing and ball milling device for mixing and ball milling, the
ball milling product is sieved by 100-500 meshes, the coarse particles on the sieve return
to the mixing and ball milling device, and the fine particles under the sieve pass the
inspection, and are used as finished products of aluminium electrolytic anode coating
prepared from aluminium dross for packaging and warehousing.
The aluminium electrolytic anode coating prepared by the use of hazardous aluminium
dross of the present invention can use waste aluminium dross resources as raw materials
to recycle aluminium, alumina, and salt resources in the hazardous aluminium dross,
thereby realizing the purpose of recycling the waste and environmentally polluting
aluminium dross. The aluminium electrolytic anode coating prepared by the use of waste
aluminium dross in the present invention is automatically sintered into a firm protective
shell under the conditions of the electrolysis process, provides excellent protection for the
carbon anode, and blocks oxygen in the atmosphere from the high temperature carbon
anode 99oxidation. As the anode is consumed, the coating shell components gradually
dissolve in the electrolyte, and their components do not change the electrolyte
composition and do not affect the existing electrolysis process. The main components are converted into calcium fluoride, sodium fluoride, and alumina. It can participate in the aluminium electrolysis reaction and is the raw material and fluoride salt additive required for electrolysis production. The anode coating has the advantages of recycling waste aluminium dross, reducing anode carbon oxidation consumption, prolonging the life of anode carbon block, reducing the amount of raw materials used for electrolytic production of alumina, calcium fluoride, sodium fluoride, etc., which reduces the production costs.
Claims (4)
1. A preparation of aluminium electrolytic anode coating by utilizing waste aluminium
dross, characterized in that the formulation components are composed of hydrated lime,
calcium aluminate, dry matter from electrolysis-dehydration of aluminium dross aqueous
solution (a mixture of sodium aluminate and potassium metaaluminate), alumina, sodium
tripolyphosphate and other components. Specifically, the mass percentage of each
component is 5%-15% hydrated lime + 10%-25% calcium aluminate + 15%-70% dry
matter + 1%-3% sodium tripolyphosphate + industrial alumina.
2. The preparation of aluminium electrolytic anode coating using waste aluminium dross
is divided into two stages. The first stage is the preparation of aluminium dross, and the
second stage is the batching of anode anti-oxidation coating.
3. The first stage specifically includes the following steps. Weigh aluminium dross and
composition analysis. Aluminium dross is dissolved in water and hydrolysed, and direct
current is applied to the salt solution, so that NaCl and KCl in the salt are electrolyzed to
prepare NaOH and KOH. The nanometer NaOH and KOH can directly dissolve the
precipitated aluminium and alumina at the bottom of the electrolyser. After removing iron
and silicon from the solution, press filtration treatment is carried out. The main
components of the filter residue are iron oxide and calcium orthosilicate, which are sent
to the storage yard; the filtrate is sodium aluminate and potassium metaaluminate. The
sodium aluminate filtrate is evaporated to obtain the dry matter of the mixture of sodium
aluminate and potassium metaaluminate, which is then as a raw material for preparing
aluminium electrolytic anode coating.
4. The second stage is characterized by including the following steps. Weighing hydrated
lime, calcium aluminate, dry matter mixture of sodium aluminate and potassium
metaaluminate, sodium tripolyphosphate, and industrial alumina based on the
requirements of the formula ratio. The mixture is mixed and ball-milled to 100-500
meshes. After passing the inspection, it is packaged and stored as the finished product of
anodized anti-oxidation coating.
The invention utilizes waste aluminium dross to prepare aluminium electrolytic anode
coating, which realizes the purpose of recycling the waste and environmentally polluting
aluminium dross. The prepared aluminium electrolytic anode coating is automatically
sintered into a strong protective shell under the conditions of the electrolysis process,
which blocks the oxidation effect of oxygen in the atmosphere on the high-temperature
carbon anode. As the anode is consumed, the coating shell components gradually dissolve
in the electrolyte, and the main components are converted into calcium fluoride, sodium
fluoride, and alumina, which are raw materials and fluoride salt additives required for
electrolytic production. It has low anode carbon oxidation consumption which prolongs
the life cycle of anode carbon blocks, reduces the amount of raw materials used in
electrolytic production of alumina, calcium fluoride, sodium fluoride, etc., and achieves
the effect of reducing production costs.
-1/1- Jan 2021 2021100249
Fig. 1
The process flow of preparing aluminium electrolytic anode anti-oxidation coating with
waste aluminium dross.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114774992A (en) * | 2022-05-18 | 2022-07-22 | 中国铝业股份有限公司 | Aluminum electrolysis production method |
| CN115365269A (en) * | 2022-08-26 | 2022-11-22 | 甘肃东兴铝业有限公司 | Method for treating electrolytic aluminum waste material |
-
2021
- 2021-01-15 AU AU2021100249A patent/AU2021100249A4/en not_active Ceased
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114774992A (en) * | 2022-05-18 | 2022-07-22 | 中国铝业股份有限公司 | Aluminum electrolysis production method |
| CN114774992B (en) * | 2022-05-18 | 2023-08-08 | 中国铝业股份有限公司 | Aluminum electrolysis production method |
| CN115365269A (en) * | 2022-08-26 | 2022-11-22 | 甘肃东兴铝业有限公司 | Method for treating electrolytic aluminum waste material |
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