CN110257642A - A kind of resource utilization method of secondary aluminium alloy ash - Google Patents
A kind of resource utilization method of secondary aluminium alloy ash Download PDFInfo
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- CN110257642A CN110257642A CN201910584547.3A CN201910584547A CN110257642A CN 110257642 A CN110257642 A CN 110257642A CN 201910584547 A CN201910584547 A CN 201910584547A CN 110257642 A CN110257642 A CN 110257642A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/02—Preparation, purification or separation of ammonia
- C01C1/022—Preparation of aqueous ammonia solutions, i.e. ammonia water
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B21/00—Obtaining aluminium
- C22B21/0038—Obtaining aluminium by other processes
- C22B21/0069—Obtaining aluminium by other processes from scrap, skimmings or any secondary source aluminium, e.g. recovery of alloy constituents
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/04—Working-up slag
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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
- C25C3/36—Alloys obtained by cathodic reduction of all their ions
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/584—Recycling of catalysts
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Abstract
The present invention provides a kind of resource utilization method of secondary aluminium alloy ash, using the secondary aluminium alloy ash generated in secondary aluminium melting, refining process as raw material, wherein clastic or blocky aluminium alloy are recycled through techniques such as broken, ball milling, screening, magnetic separation and obtains secondary recycling aluminum alloy ash；Then wherein various salts are recycled by techniques such as washing, filtering, evaporations to secondary recycling aluminum alloy ash again and are recycled；Nitrogen component in remaining lime-ash is recycled using catalysis denitrogenation, it is out of stock to can be used for the desulfurization in industrial production using ammonium hydroxide obtained by water spray method absorption ammonia；High-temperature calcination finally is carried out to the solid ash after denitrogenation, obtains the material also containing a small amount of other valuable components based on aluminium oxide, then by techniques such as component allotment and molten-salt electrolysis, obtain the controllable aluminium alloy ingots of each element component.Not only process flow is short by the present invention, but also while having saved cost, and prevents pollution, realizes the innoxious and comprehensive utilization of resources of secondary aluminium alloy ash.
Description
Technical field
The present invention relates to Recycling Aluminum Industry solid waste utilization technology fields, particularly relate to a kind of secondary aluminium alloy ash
Resource utilization method.
Background technique
Secondary aluminium refers to by being sorted to waste aluminum, scrap aluminium alloy material or containing aluminium waste, salt melting and again
The aluminium alloy or aluminum metal obtained after molten refinement.Its waste material main source includes aluminium ingot, pop can, aluminum steel and aluminium slice etc..With
Aluminum i ndustry fast development and metallic aluminium reserves by prolonged accumulation, China will welcome the peak period that aluminium is scrapped,
Regeneration bauxite resource constantly increases, and waste aluminum recovery potentiality start maturation, and the scrap aluminum resources of recoverable greatly increase.
It is that the aluminium of melting is contacted with atmosphere so that table during secondary aluminium alloy ash results from scrap aluminium alloy recycling remelting
Face occurs oxidation and forms the semisolid dross for swimming in upper layer.Secondary aluminium alloy ash compared to electrolytic aluminium aluminium ash salt content compared with
More, color is deeper, generally presentation grey black.The main reason is that NaCl, KCl or fluoride would generally be added in reflow process
(CaF) etc. salts are as refining agent.The main component of secondary aluminium alloy ash be aluminium (10~50%), aluminium oxide (30%~
50%), salt (5%~15%) and other oxides (Fe, Cu, Mg, Si, Zn etc.).
The yield of China's secondary aluminium in 2018 is 6,930,000 tons according to statistics, and the rate of recovery of aluminium is generally 75% in regenerative process
~85%, one ton of aluminium of every production about generates 100-200kg secondary aluminium alloy ash, and it is about 70~150 that the whole nation, which amounts to year yield,
Ten thousand tons.Contain a large amount of heavy metal element in secondary aluminium alloy ash, heavy metal element precipitates the pollution for causing water resource.Secondary aluminium
When aluminium nitride and water in alloy ash contact, ammonia can be released, atmosphere pollution is caused.Aluminium ash was put into 2016
" National Hazard waste register ".If secondary aluminium alloy ash is not dealt carefully with, the pollution of environment is not only created, packet is also created
Include the wasting of resources including aluminium and a variety of valuable metals.
The processing of the current secondary aluminium alloy ash in China there are the rate of recovery it is low, energy consumption is big and the wasting of resources is big the problems such as.
The Chinese patent of Patent No. CN10169396B discloses a kind of aluminium and aluminum alloy ash is directly used in electrolysis production and follows
The method that ring utilizes, the patent will directly return to electrolytic cell after the molten aluminium ash cooling generated with during and recycle.Aluminium
The unprocessed direct return electrolytic cell of AlN contained by ash, AlN does not dissolve in electrolyte, and its density is greater than electrolyte, often
Cause bearth precipitation.
The Chinese patent of Publication No. CN106399693A discloses a kind of method that the integrated treatment of aluminium ash utilizes, and passes through
Heating separation one secondary aluminium ash, 90% or more recycling are obtained aluminium, are obtained carrying fluorine oxygen using disposable gas caused by alumina adsorption
Change aluminium, fluorinated alumina returns to electrolytic cell and uses；Pass through the works such as cooling, grinding, water or diluted acid leaching, washing filtering, drying again
Skill technical treatment Quadratic aluminum dust, is prepared alumina powder, and the same electrolytic cell that returns uses.It is big present in secondary aluminium alloy ash
Valuable element is measured, not only causes the waste of a large amount of valuable elements, while the waste liquid generated is untreated also will cause environment
Pollution.
Therefore, it has been disclosed that patent or technology fail the recycling for efficiently and economically solving secondary aluminium alloy ash and recycling benefit
Use problem.The technology for researching and developing integrated treatment reclaiming aluminum i ndustry aluminium ash, for realizing Recycling Aluminum Industry waste
Innoxious and comprehensive utilization of resources has important practical significance for the economic benefit and competitiveness that improve secondary aluminium enterprise
And practical value.
Summary of the invention
The technical problem to be solved by the present invention is to be directed to the preservation characteristic of secondary aluminium alloy ash, a kind of secondary aluminium alloy is provided
The resource utilization method of ash, overcome the deficiencies in the prior art realize that the innoxious and comprehensive resource of secondary aluminium alloy ash is sharp
With.
In order to solve the above technical problems, the embodiment of the present invention provides a kind of resource utilization side of secondary aluminium alloy ash
The resource utilization method of method, the secondary aluminium alloy ash includes:
Step 1: pre-processing to secondary aluminium alloy ash to be processed, secondary recycling aluminum alloy ash is obtained；Utilize magnetic separation
Method removes the iron powder and its oxide in the secondary recycling aluminum alloy ash；
Step 2: water and catalyst are added into the secondary recycling aluminum alloy ash for removing iron powder and its oxide and stirs mixed
It is even, denitrogenation is hydrolyzed by heating；The ammonia of generation is recycled using water spray method, obtains low concentration ammonium hydroxide；After the completion of denitrogenation
It is filtered, and by filtrate stepped evaporation to recycle wherein salt；
Step 3: carrying out the calcining of preset duration to filter residue obtained after filtering under preset temperature, obtain containing a variety of
The aluminium oxide regeneration feed of valuable metal element.
Further, the method also includes:
Step 4: to aluminium oxide regeneration feed obtained in step 3 being required that oxidation is added thereto according to default electrolysis
Aluminium carries out mixing, the regeneration feed after being deployed；
Step 5: being sent into the regeneration feed after allotment obtained in step 4 as raw material in aluminium cell, by molten
The method of salt electrolysis prepares aluminium alloy.
Further, the method also includes:
Step 6: casting the aluminium for meeting preset requirement by component allotment and melt casting process to obtained aluminium alloy
Alloy pig.
Further, secondary aluminium alloy ash to be processed is pre-processed in step 1, obtains secondary recycling aluminium alloy
Ash, comprising:
Step A, by secondary aluminium alloy ash to be processed by broken crusher machine after, utilize magnetic method to remove bulk therein
Ferrous metal and its oxide are then fed into ball mill and carry out ball milling；
Step B, the secondary aluminium alloy ash after ball milling is sieved by vibrating screen, obtains oversize and screenings；Benefit
The iron powder and its oxide in oversize are removed with magnetic method, metallic aluminium and clastic are recycled from oversize or blocky aluminium closes
Gold；Screenings is secondary recycling aluminum alloy ash.
It further, is 5~120 minutes to the Ball-milling Time of secondary aluminium alloy ash in step A, the secondary aluminium after ball milling closes
The average particle size of golden ash is no more than 20 mesh；
Vibrating screen used in step B is the vibrating screen of 100 mesh.
Optionally, recyclable device used by the magnetic method is permanent magnet or electromagnet.
Preferably, the catalyst is appointing in aluminum fluoride, sodium carbonate, sodium hydroxide, strong acid salt, organic acid and its esters
It anticipates one or more combinations；
The ammonia of generation is recycled using tertiary effluent spray process in above-mentioned steps two.
Further, the mass ratio of the water and secondary recycling aluminum alloy ash that are added in the step 2 is 1:1~10；Heating
Temperature is 50~200 DEG C, and the denitrification reaction time is 10~480 minutes.
Further, the calcination temperature in step 3 is 600~1100 DEG C, and calcination time is -60 minutes 1 second.
Further, the electrolysis temperature in the step 5 is 900~960 DEG C, and the aluminium cell capacity is 160-
600kA。
The advantageous effects of the above technical solutions of the present invention are as follows:
The component feature for the secondary aluminium alloy ash that the present invention generates when producing secondary aluminium according to secondary aluminium enterprise, use are a variety of
The method that technique combines carries out the integrated treatment and utilization of recycling to it.Contained in the resulting aluminium alloy ingots of the present invention
Various microelements require to add in subsequent aluminium alloy casting process, and the content of microelement is in controlled range
Within.Compared to existing method, the present invention has not only recycled the bauxite resource in secondary aluminium alloy ash, but also but also pollution ring
The valuable heavy metal element in border is fully used.For use refining agent in secondary aluminium production process and the villiaumite that generates and
Villaumite, a part are recovered as salt again, and another part is used effectively in electrolytic process as additive.The present invention is real
The high-valued synthetical recovery of secondary aluminium alloy ash is showed；Not only process flow is short, but also while save the cost, it is therefore prevented that dirty
Dye, is truly realized the innoxious and comprehensive utilization of resources of secondary aluminium alloy ash, remarkable in economical benefits.
Detailed description of the invention
Fig. 1 is the process flow diagram of the resource utilization method of secondary aluminium alloy ash of the invention.
Specific embodiment
To keep the technical problem to be solved in the present invention, technical solution and advantage clearer, below in conjunction with attached drawing and tool
Body embodiment is described in detail.
The present invention fails the recycling for efficiently and economically solving secondary aluminium alloy ash and resource utilization for the prior art
Problem provides a kind of resource utilization method of secondary aluminium alloy ash；As shown in Figure 1, the recycling benefit of secondary aluminium alloy ash
Include: with method
Step 1: by secondary aluminium alloy ash to be processed by being removed wherein using magnetic method after jaw crushing crusher machine
Bulk ferrous metal and its oxide, be then fed into ball mill carry out ball milling；
Wherein, the Ball-milling Time in above-mentioned steps is 5~120 minutes, the average particle size of the secondary aluminium alloy ash after ball milling
No more than 20 mesh.
Step 2: sieving by vibrating screen to the secondary aluminium alloy ash after ball milling, oversize and screenings are obtained；Benefit
The iron powder and its oxide in oversize are removed with magnetic method, metallic aluminium and clastic are recycled from oversize or blocky aluminium closes
Gold；Screenings is secondary recycling aluminum alloy ash；
Step 3: removing the iron powder and its oxide in secondary recycling aluminum alloy ash using magnetic method；
Wherein, vibrating screen used in above-mentioned steps is the vibrating screen of 100 mesh；Recyclable device used by magnetic method is forever
Magnet or electromagnet.
Step 4: water and catalyst are added into the secondary recycling aluminum alloy ash for removing iron powder and its oxide and stirs mixed
It is even, denitrogenation is hydrolyzed by heating；The ammonia of generation is recycled using water spray method, obtains low concentration ammonium hydroxide；After the completion of denitrogenation
It is filtered, and by filtrate stepped evaporation to recycle wherein salt；
Wherein, the salt that above-mentioned steps are recycled includes NaCl, KCl and fluoride salt；Used catalyst is aluminum fluoride, carbonic acid
The combination of any one or more in sodium, sodium hydroxide, strong acid salt, organic acid and its esters；And use tertiary effluent spray process
The ammonia of generation is recycled.Manufactured ammonium hydroxide can be used for the desulphurization denitration in power plant or steam boiler flue gas.
The mass ratio of the water and secondary recycling aluminum alloy ash that are added in denitrogenation is 1:1~10；Heating temperature is 50~200
DEG C, the denitrification reaction time is 10~480 minutes.
Step 5: carrying out the calcining of preset temperature to the secondary recycling aluminum alloy ash after denitrogenation, obtain containing a variety of valuable gold
Belong to element, and using aluminium oxide as the regeneration feed of principal component.
Wherein, the calcination temperature in above-mentioned steps is 600~1100 DEG C, and calcination time is -60 minutes 1 second.
Step 6: to the aluminium oxide regeneration feed that step 5 obtains being required that aluminium oxide is added thereto according to default electrolysis
Carry out mixing, the regeneration feed after being deployed；
Step 7: being sent into the regeneration feed after the allotment that step 6 obtains as raw material in aluminium cell, pass through fused salt
The method of electrolysis prepares aluminium alloy.
Wherein, the electrolysis temperature in above-mentioned steps is 900~960 DEG C, and aluminium cell capacity is 160-600kA.
Step 8: the clastic of step 2 recycling or the aluminium alloy of blocky aluminium alloy and step 7 preparation are passed through component
Allotment and melt casting process cast the aluminium alloy ingots for meeting preset requirement.
Below by way of example, technical solution of the present invention is further explained:
By secondary aluminium alloy ash by removing bulk iron filings therein using magnetic separator, then send after jaw crushing crusher machine
Enter ball mill ball milling 30min, granularity to be averaged is less than stopping ball milling after 50 mesh.By the secondary aluminium alloy ash after ball milling in 100 mesh
Vibrating screen on sieved, obtain oversize and screenings.Oversize using electromagnet except clastic i.e. recyclable after iron or
Blocky aluminium alloy, screenings are secondary recycling aluminum alloy ash.Water is mixed with secondary recycling aluminum alloy ash with the ratio of 1:3, is added
The sodium carbonate and aluminum fluoride for entering 2% heat 60min under conditions of 105 DEG C after mixing.Generated ammonia is sprayed by three-level
Mode be made ammonium hydroxide；Be filtered after the completion of denitrogenation, then by filtrate carry out NaCl, KCl in three-level evaporation recycling slag and
Fluoride salt.Then the secondary aluminium alloy ash after obtained denitrogenation is calcined at a high temperature of 800 DEG C, it is more obtains cupric, zinc, silicon etc.
The alumina material of kind valuable metal ingredient.Addition aluminium oxide is required according to production alloy and is uniformly mixed, it will be obtained mixed
It closes material to be sent into the electrolytic cell of 160kA, electrolytic preparation has obtained aluminium alloy ingots at being 940 DEG C in temperature.Its main component master
It wants are as follows: Al:91%, Si:3.7%, Zn:2.9%, Cu:2.4%.
The component feature for the secondary aluminium alloy ash that the present invention generates when producing secondary aluminium according to secondary aluminium enterprise, use are a variety of
The method that technique combines carries out the integrated treatment and utilization of recycling to it.Contained in the resulting aluminium alloy ingots of the present invention
Various microelements require to add in subsequent aluminium alloy casting process, and the content of microelement is in controlled range
Within.Compared to existing method, the present invention has not only recycled the bauxite resource in secondary aluminium alloy ash, but also but also pollution ring
The valuable heavy metal element in border is fully used.For use refining agent in secondary aluminium production process and the villiaumite that generates and
Villaumite, a part are recovered as salt again, and another part is used effectively in electrolytic process as additive.The present invention is real
The high-valued synthetical recovery of secondary aluminium alloy ash is showed；Not only process flow is short, but also while save the cost, it is therefore prevented that dirty
Dye, is truly realized the innoxious and comprehensive utilization of resources of secondary aluminium alloy ash, remarkable in economical benefits.
In addition, it should be noted that, herein, the terms "include", "comprise" or its any other variant are intended to contain
Lid non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, several improvements and modifications can also be made, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of resource utilization method of secondary aluminium alloy ash, which is characterized in that the described method includes:
Step 1: pre-processing to secondary aluminium alloy ash to be processed, secondary recycling aluminum alloy ash is obtained；It is removed using magnetic method
Remove the iron powder and its oxide in the secondary recycling aluminum alloy ash；
Step 2: water and catalyst are added into the secondary recycling aluminum alloy ash for removing iron powder and its oxide and stirs and evenly mixs,
Denitrogenation is hydrolyzed by heating；The ammonia of generation is recycled using water spray method, obtains low concentration ammonium hydroxide；It is carried out after the completion of denitrogenation
Filtering, and by filtrate stepped evaporation to recycle wherein salt；
Step 3: carrying out the calcining of preset duration to filter residue obtained after filtering under preset temperature, obtain containing a variety of valuable
The aluminium oxide regeneration feed of metallic element.
2. the resource utilization method of secondary aluminium alloy ash as described in claim 1, which is characterized in that the method is also wrapped
It includes:
Step 4: to aluminium oxide regeneration feed obtained in step 3, according to default electrolysis require to be added thereto aluminium oxide into
Row mixing, the regeneration feed after being deployed；
Step 5: being sent into the regeneration feed after allotment obtained in step 4 as raw material in aluminium cell, pass through fused salt electricity
The method of solution prepares aluminium alloy.
3. the resource utilization method of secondary aluminium alloy ash as claimed in claim 2, which is characterized in that the method is also wrapped
It includes:
Step 6: casting the aluminium alloy for meeting preset requirement by component allotment and melt casting process to obtained aluminium alloy
Ingot.
4. the resource utilization method of secondary aluminium alloy ash as claimed in claim 3, which is characterized in that treat place in step 1
The secondary aluminium alloy ash of reason is pre-processed, and secondary recycling aluminum alloy ash is obtained, comprising:
Step A, by secondary aluminium alloy ash to be processed by broken crusher machine after, utilize magnetic method to remove blocky iron gold therein
Category and its oxide are then fed into ball mill and carry out ball milling；
Step B, the secondary aluminium alloy ash after ball milling is sieved by vibrating screen, obtains oversize and screenings；Utilize magnetic
It selects method to remove iron powder and its oxide in oversize, metallic aluminium and clastic or blocky aluminium alloy is recycled from oversize；Sieve
Lower object is secondary recycling aluminum alloy ash.
5. the resource utilization method of secondary aluminium alloy ash as claimed in claim 4, which is characterized in that regeneration in step A
The Ball-milling Time of aluminum alloy ash is 5~120 minutes, and the average particle size of the secondary aluminium alloy ash after ball milling is no more than 20 mesh；Step B
Used in vibrating screen be 100 mesh vibrating screen.
6. the resource utilization method of secondary aluminium alloy ash as described in any one in claim 1-5, which is characterized in that the magnetic
Selecting recyclable device used by method is permanent magnet or electromagnet.
7. the resource utilization method of secondary aluminium alloy ash as described in claim 1, which is characterized in that the catalyst is fluorine
Change the combination of any one or more in aluminium, sodium carbonate, sodium hydroxide, strong acid salt, organic acid and its esters；It is adopted in step 2
It is recycled with ammonia of the tertiary effluent spray process to generation.
8. the resource utilization method of secondary aluminium alloy ash as claimed in claim 7, which is characterized in that be added in step 2
The mass ratio of water and secondary recycling aluminum alloy ash is 1:1~10；Heating temperature be 50~200 DEG C, the denitrification reaction time be 10~
480 minutes.
9. the resource utilization method of secondary aluminium alloy ash as described in claim 1, which is characterized in that the calcining in step 3
Temperature is 600~1100 DEG C, and calcination time is -60 minutes 1 second.
10. the resource utilization method of secondary aluminium alloy ash as claimed in claim 2, which is characterized in that the electricity in step 5
Solving temperature is 900~960 DEG C, and the aluminium cell capacity is 160-600kA.
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Cited By (9)
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| CN111940460A (en) * | 2020-08-10 | 2020-11-17 | 南通大学 | Aluminum ash final ash low-temperature catalytic denitrification method |
| CN112058868A (en) * | 2020-08-31 | 2020-12-11 | 青海北辰科技有限公司 | Solid waste residue processing apparatus in electrolytic magnesium production |
| CN112570419A (en) * | 2020-11-20 | 2021-03-30 | 四川科龙达环保股份有限公司 | Aluminum ash recycling method, harmless aluminum ash and application of harmless aluminum ash |
| CN112811451A (en) * | 2020-12-24 | 2021-05-18 | 安溪县世荣有色金属有限公司 | Alumina recovery system and method |
| CN113089028A (en) * | 2021-03-18 | 2021-07-09 | 北京科技大学 | Method for producing aluminum alloy by taking aluminum alloy regenerated ash as raw material |
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