CN116121538A - Method for deeply purifying regenerated avionics melt to avoid impurity generation - Google Patents

Method for deeply purifying regenerated avionics melt to avoid impurity generation Download PDF

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CN116121538A
CN116121538A CN202211490830.8A CN202211490830A CN116121538A CN 116121538 A CN116121538 A CN 116121538A CN 202211490830 A CN202211490830 A CN 202211490830A CN 116121538 A CN116121538 A CN 116121538A
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aluminum
melt
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张深根
王建文
刘波
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University of Science and Technology Beijing USTB
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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
    • C22B7/001—Dry processes
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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    • C22B21/06—Obtaining aluminium refining
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    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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    • C22B21/06—Obtaining aluminium refining
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    • C22C1/00—Making non-ferrous alloys
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    • C22C1/026—Alloys based on aluminium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J1/00—Removing ash, clinker, or slag from combustion chambers
    • F23J1/04—Hand tools, e.g. rakes, prickers, tongs
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    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
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    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
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Abstract

A method for deeply purifying regenerated avionic aluminum melt to avoid impurity generation belongs to the field of regenerated aluminum alloy. The method uses refractory materials which do not react with the avionic aluminum melt to carry out pollution-free smelting, pollution-free deslagging and argon refining. The smelting furnace refractory material for pollution-free smelting is made of one or two of aluminum oxide and magnesium oxide, and the mass ratio of the aluminum oxide to the magnesium oxide is 0-1.0; the pollution-free deslagging adopts a graphite or high-temperature alloy tool to skim slag and drag for slag; refining by adopting argon with purity not less than 99.99%. The regenerated avionic aluminum is not produced and introduced in smelting, impurity removal and refining, and has the advantages of high purity of melt, low burning loss, high recovery rate, low content of polluted aluminum nitride in aluminum ash, no salt substances, simple process, low cost, no secondary pollution and easy industrialization.

Description

Method for deeply purifying regenerated avionics melt to avoid impurity generation
Technical Field
The invention belongs to the field of regenerated aluminum alloy, and particularly relates to a method for deeply purifying regenerated avionic aluminum melt to avoid impurity generation.
Background
The service environment of the aviation aluminum alloy is bad, and impurities and defects can seriously affect the strength, toughness, fatigue resistance, corrosion resistance and other performances of the aviation aluminum alloy, so that the purity requirement on the regenerated aviation aluminum melt is extremely high. The regenerated aluminum production equipment and process generally generate or introduce a large amount of impurities, so that the purity of the regenerated aluminum melt cannot meet the aviation aluminum alloy requirement, and the root cause of the impurities is that the impurities are generated or generated in the existing smelting, deslagging, refining and other processes, and the melt purifying effect is not ideal. Therefore, there is a need to develop a method for deeply purifying a regenerated avionic aluminum melt to avoid the generation of impurities, obtain the regenerated avionic aluminum melt with high purity, and meet the requirements of quality-keeping and recycling of the avionic aluminum alloy.
Impurities in the avionic aluminum regeneration process are mainly generated or introduced by smelting, deslagging and refining processes.
The lining of the smelting furnace is made of clay, mullite and aluminum-containing shaped or unshaped refractory materials. The refractory contains a large amount of silicon oxide and a small amount of iron and titanium oxide. In the smelting process, the regenerated avionic aluminum melt reacts with silicon, iron and titanium oxides in the refractory material to generate impurities, and a chemical reaction equation at 800 ℃ and gibbs free energy delta G are as follows:
4Al+3SiO 2 ＝2Al 2 O 3 +3Si ΔG＝-520.822kJ (1)
2Al+Fe 2 O 3 ＝Al 2 O 3 +2Fe ΔG＝-795.554kJ (2)
SiO 2 +2Mg＝2MgO+Si ΔG＝-252.558kJ (3)
2SiO 2 +Mg+2Al＝MgAl 2 O 4 +2Si ΔG＝-386.690kJ (4)
3(3Al 2 O 3 ·2SiO 2 )+8Al＝13Al 2 O 3 +6Si ΔG＝-1041.643kJ (5)
3TiO 2 +4Al＝2Al 2 O 3 from formulas 1 to 6, +3TiΔG= -424.053kJ (6), aluminumThe delta G of the reaction of the melt and the refractory material is negative, and a large amount of heterogeneous impurities are generated by the reaction, so that the purity of the regenerated avionics melt is reduced.
Slag removal comprises slag dragging and slag skimming. The slag skimming is to skim off impurities with high density and high melting point in the melt, and the slag skimming is to skim off floating impurities on the surface of the melt. The iron tool for skimming and skimming is coated with a release agent or talcum powder composed of silicon oxide and magnesium silicate minerals on the surface, and as shown in the formulas 1-5, the aluminum melt can chemically react with silicon oxide, iron oxide on the surface of the tool and the like to generate a large amount of impurities, so that the purity of the melt is reduced; and aluminum, iron and alloys thereof form acicular Fe-Al alloy phases, seriously deteriorating the performance of the alloy.
Refining is degassing and impurity removing. The existing refining mode comprises flux refining and nitrogen refining. The flux refining is mainly achieved by adsorption and dissolution of oxide inclusions in the melt. The nitrogen refining is mainly realized by gas diffusion and tension adsorption of bubble surfaces and oxide inclusions through partial pressure difference of the nitrogen refining and hydrogen in the melt. The chemical reaction equation of nitrogen and aluminum melt at 800 ℃ and delta G thereof are negative, and aluminum nitride impurities are generated in the melt, so that the purity of the melt is reduced, and the difficulty of precise regulation and control of the melt components is increased.
N 2 +2Al＝2AlN ΔG＝-406.332kJ (7)
Therefore, in order to obtain the regenerated aviation aluminum melt with high purity, no-pollution smelting, no-pollution deslagging and no-pollution refining are required, and the requirements of aviation aluminum alloy grade-keeping recycling are met.
Chinese patent CN111020223a discloses a casting method for recycling, regenerating and protecting grade of waste aluminum, which classifies waste materials, feeds materials, adds the waste materials into a smelting furnace for smelting and refining, and then obtains casting materials through online degassing, online filtering and semicontinuous casting. However, the method cannot avoid that the aluminum melt reacts with refractory materials such as furnace lining, ventilation bed and the like to generate heterogeneous impurities to pollute the melt in the smelting and refining processes, the equipment life is short, the process is complex, the cost is high, the heterogeneous impurities still exist after on-line filtration, and the purity requirement of avionic aluminum cannot be met.
Chinese patent CN103267419B discloses an aluminum melting launder, in which a blocking body is provided at the notch of the launder body and the bottom of the launder, respectively, to form a necking or necking type launder to block segregated metals and slag inclusion. Chinese patent CN204075173U discloses a secondary aluminum melting launder, which is provided with a blocking device and a wick in the notch of the launder body to block and filter the melt impurities. However, the device can not avoid the introduction of heterogeneous impurities by the reaction of the aluminum melt and the refractory material in the smelting process, only the segregation phase and slag inclusion of the melt in the launder are blocked/filtered by the fluid characteristics, the impurity removal is incomplete, the requirements of avionic aluminum cleanliness can not be met, the blocking body is made of a high-temperature resistant material, and the introduction of more heterogeneous impurities and poor equipment durability by the reaction of the aluminum melt and the high-temperature material can not be avoided.
Chinese patent CN113278832A discloses a method for preparing regenerated aluminum alloy from waste aluminum alloy, which comprises weighing waste aluminum alloy to be treated, heating and smelting in an induction furnace, degassing with argon, adding Al-20Mn, al-30RE and Al-10Sr for refining and modifying, and adding Al-30Si and Al10Mg for component adjustment. Chinese patent CN113234949a discloses a method for preparing a regenerated deformed aluminum alloy from waste aluminum alloy, which comprises purifying the waste aluminum alloy, melting, maintaining the temperature at 745-755 ℃, cooling, adding pure Al, al-30Si, al10Mg, al-20Mn, al-30Cr, and Al-RE according to the alloy components, and adjusting. The method converts part of impurities which are difficult to remove into a reinforcing phase, but aviation aluminum alloy components are strictly required, components are difficult to regulate and control due to the introduction of Si, mg, mn, cr, rare earth and other elements, the content of heterogeneous impurity phases in a melt is increased due to the introduction of Si, mn, cr, zr, rare earth and other elements, and the requirement of melt purity of aviation aluminum alloy cannot be met.
Chinese patent CN111424182a discloses a process for casting regenerated aluminum, which adopts deep-bed filtration, and the medium filling method is as follows: the first layer is 3/4' alumina balls, and the filling height is 20mm-30mm; the second layer is 1/2' alumina balls, and the filling height is 20mm-30mm; the third layer is 3-6 mesh alumina particles with filling height of 350-400 mm; the fourth layer is 1/2' alumina balls, and the filling height is 20mm-30mm; the fifth layer is 3/4' alumina balls, which are filled to a height of 20mm-30mm and refined with nitrogen and chlorine, argon and chlorine, nitrogen or argon. The regenerated aluminum melt prepared by the method has stable components, and the hydrogen content and the slag content meet the production requirements of 3104 aluminum alloy can body materials. However, the deep-bed filler is easy to block, the introduction of heterogeneous impurities in the reaction of the aluminum melt and the refractory material in the smelting process cannot be avoided, the further introduction of heterogeneous impurities in the reaction of nitrogen and chlorine refining and the aluminum melt can be avoided, the size of the filtering and filling medium is large, the impurity removal is not thorough, and the requirement of the melt purity of the aviation aluminum alloy cannot be met.
The existing equipment and method cannot avoid the problems that heterogeneous impurities are introduced in the reaction of the aluminum melt and the refractory material in the smelting process, secondary pollution melt of aluminum nitride and salt substances is generated by using nitrogen and a salt refining agent, impurity removal is incomplete, burning loss is high, the durability of a tool is low, the impurity removal process is complex, the cost is high, the component of the aluminum melt is difficult to regulate and control, the content of aluminum nitride and salt substances in aluminum ash is high, and the like, and cannot meet the requirement of the melt purity of the high-quality and high-performance aluminum alloy for aerospace, so that the recycled aluminum alloy is degraded and utilized to be low-grade cast aluminum alloy. Therefore, a method for deeply purifying regenerated avionics melt, which has the advantages of good impurity removal effect, simple process, low cost, no impurity introduction, no change of melt components, high melt purity, low burning loss, high recovery rate, low content of polluting aluminum nitride in aluminum ash, no salt substances, long service life of materials, no secondary pollution and easy industrialization, and can avoid impurity generation, is needed to realize high-purity regenerated avionics melt and further realize the quality and high-performance aviation aluminum alloy quality-keeping recycling.
Disclosure of Invention
The invention aims to provide a method for deeply purifying a regenerated avionic aluminum melt to avoid impurity generation, so as to obtain the regenerated avionic aluminum melt with high purity and realize the grade-keeping recycling of the avionic aluminum alloy.
The invention uses refractory materials which do not react with the regenerated avionic aluminum melt as a smelting furnace lining, graphite or a high-temperature alloy tool and argon as a refining agent to carry out pollution-free smelting, pollution-free deslagging and pollution-free refining. The refractory material is made of one or two of aluminum oxide and magnesium oxide, and the mass ratio of the aluminum oxide is 0-1.0; the pollution-free deslagging adopts a graphite or high-temperature alloy tool to skim slag and drag for slag; and adopting argon with purity not lower than 99.99% to carry out pollution-free refining. The regenerated avionic aluminum smelting, deslagging and refining of the invention are not generated and impurities are not introduced, and the method has the characteristics of high melt purity, low burning loss, high recovery rate, low content of polluted aluminum nitride in aluminum ash and no salt substances, and is simple in process, low in cost, free of secondary pollution and easy for industrialization.
The invention discloses a method for deeply purifying a regenerated avionic aluminum melt to avoid impurity generation, which is characterized by pollution-free smelting, pollution-free deslagging and pollution-free refining.
Further, the pollution-free smelting refractory material is made of one or two of aluminum oxide and magnesium oxide, wherein the mass ratio of the aluminum oxide is 0-1.0.
Further, the pollution-free deslagging adopts a tool for deslagging and slag dragging of graphite or high-temperature alloy.
Further, the pollution-free refining adopts argon refining with purity not lower than 99.99 percent.
Further, after the regenerated aviation aluminum melt is deeply purified, the hydrogen content (liquid state) is less than or equal to 0.10mL/100gAl, the slag content (on-line) is less than or equal to 2000/kgAl, and the requirement of aviation aluminum alloy is met.
Further, the burning loss rate of the method is 0.4-1.0%, and the aluminum nitride content in the aluminum ash is not higher than 0.8wt.%.
The principle of the invention is as follows:
1) Refractory materials, tools and inert gases used in the smelting process do not react with the aluminum melt,
in the smelting process, the refractory materials used in the invention are alumina and magnesia, and have stable properties and do not react with aluminum melt. The chemical reaction equation between magnesium oxide and aluminum melt is shown in formula 8.
3MgO+2Al＝Al 2 O 3 +3Mg (8)
The ΔG and the chemical equilibrium constant K of the reaction are shown in Table 1 at 650-1000 ℃.
TABLE 1 Gibbs free energy and chemical equilibrium constant change for magnesium oxide and aluminum reactions
Figure BDA0003964920740000041
Is generally considered as K>10 5 The reaction is more complete (i.e. irreversible reaction), K<10 -5 The reaction is difficult to carry out (i.e., does not react). As can be seen from Table 1, the Gibbs free energy corresponding to the reaction is positive at a melting temperature of 650-1000 ℃ and is thermodynamically non-spontaneously reactive, and K is less than 10 -5 The reaction is not carried out dynamically, so that the refractory material prepared from magnesium oxide does not react with the aluminium melt at the smelting temperature.
In the deslagging process, the slag dragging and skimming tool is made of graphite and superalloy, and the graphite and superalloy are stable in property and do not react with aluminum melt. Therefore, the tool prepared from graphite and high-temperature alloy does not have any chemical reaction with the aluminum melt in the slag skimming and slag dragging processes.
Argon is inert gas, does not react with any substance, and is not dissolved in aluminum melt. The regenerated aluminum melt is refined by adopting argon, so that the use of a salt refining agent and nitrogen is avoided, and no impurity is generated.
Therefore, the refractory materials, tools and inert gases used in the invention do not react with the aluminum melt, impurities are generated or introduced in the smelting, deslagging and refining processes, no secondary pollution is caused, and the high-purity melt is obtained.
2) The refractory material and tool are not soaked with molten aluminium
The aluminum melt, aluminum oxide and magnesium oxide are mutually non-wetting, and the contact angles of the aluminum melt, the aluminum oxide and the magnesium oxide are all larger than 90 degrees. When the aluminum melt contacts the refractory material, the liquid drop forms a contact angle with the refractory material as shown in fig. 2, wherein 1 is the furnace gas atmosphere, 2 is the aluminum melt, 3 is the refractory material, and sigma 1 Sigma, the interfacial tension between the furnace gas and the refractory material 2 Sigma is the interfacial tension between the furnace gas and the aluminum melt 3 Is the interfacial tension between the aluminum melt and the refractory material, θ is the contact angle. According toIt was experimentally found that the contact angle was 130-134 deg. when the alumina content of the alumina refractory was not less than 95% and the magnesia content of the magnesia refractory was not less than 95% at 650-1000 deg.c. The contact angle is 95-97 deg., when the alumina-magnesia content of the alumina-magnesia refractory material is not less than 95%, the contact angle is 95-134 deg. when the mass ratio of alumina to magnesia is 0-1, and the contact angle is 135 deg. when the tool is graphite material.
From the poplar equation
σ 2 cosθ＝σ 1 -σ 3 (9)
Because θ >90 °, then there is cos θ <0, i.e
Figure BDA0003964920740000051
And due to sigma 2 Is positive, so
σ 1 <σ 3 <(σ 2 +σ 3 ) (11)
Representation of the entropy increase according to the second law of thermodynamics: the entropy of the isolated system is never automatically reduced, the entropy is unchanged in the reversible process, and the entropy is increased in the irreversible process. When the aluminum melt drops on the refractory material, the aluminum melt can be approximately regarded as no external energy input, the aluminum melt, the refractory material and the local furnace gas are regarded as an isolated system, and substances in the isolated system have the tendency of spontaneously releasing energy to perform enthalpy-reducing entropy-increasing evolution, namely, the minimum energy principle is satisfied. As can be obtained from formula (11), the interfacial tension between the refractory and the furnace gas is smaller than the interfacial tension between the aluminum melt and the refractory and smaller than the sum of the interfacial tension between the aluminum melt and the refractory and the interfacial tension between the aluminum melt and the furnace gas, and the isolated system tends to decrease (σ 2 +σ 3 ) Namely, the interfacial tension between the aluminum melt and the refractory material is reduced, and the high-energy interface is eliminated, so that the aluminum melt spontaneously breaks away from the refractory material.
Thus, the aluminum melt is not infiltrated with the refractory materials, tools, used in the present invention. The refractory material and the tool used in the invention are not sticky to aluminum, have high strength, are resistant to scouring of aluminum melt, have long service life, are not eroded to pollute the melt, and are easy to regulate and control the components of the melt.
3) Principle of reducing cost
(1) The smelting and deslagging tool and the material are not reacted with the aluminum melt, are not sticky to aluminum, are not easy to corrode by the aluminum melt and are resistant to scouring, and the salt refining agent is not used in the refining process, so that the generation of chlorine-containing and fluorine-containing toxic gases in the refining process is avoided, the environment is polluted and equipment is corroded, and the service life of the smelting deslagging equipment is long. At present, a smelting furnace of a secondary aluminum factory is easy to react with an aluminum melt, and a furnace lining refractory material is repaired for about 1 month, and the furnace lining refractory material is required to be maintained and dried after 3 to 7 days of shutdown during repair. The fire resistance used in the method does not react with the aluminum melt in the smelting process, only needs to be checked in parallel when furnace cleaning is carried out in each month in production, and is verified by actual production, the furnace is maintained once in about 6 months, the furnace is increased from 2000 furnace to 6000 furnace, and the equipment maintenance and repair cost is greatly reduced.
(2) The smelting and deslagging tools and materials are not reacted with the aluminum melt, so that the burning loss of the regenerated aviation aluminum melt and the burning loss of active elements are greatly reduced, the components are easy to adjust, the burning loss rate of the melt is 0.4-1.0%, and the cost of raw materials and auxiliary materials is reduced.
(3) The smelting and deslagging process is simple, and heterogeneous impurity pollution in the smelting process is fundamentally avoided, so that slag skimming and argon refining are only required, extra complex external impurity removal and refining equipment is not required, the process and equipment are simple, the production period is short, the energy consumption is low, and the production cost is greatly reduced.
(4) The refining process does not use salt refining agent and nitrogen, so that the generation of chlorine-containing and fluorine-containing toxic gases and salt substances to pollute the melt in the refining process is avoided, the reaction of nitrogen and the aluminum melt is avoided to generate aluminum nitride, the burning loss of the aluminum melt is reduced, the aluminum ash obtained by slag skimming after refining does not contain salt, the aluminum nitride content in the aluminum ash is not higher than 0.8wt.%, the secondary pollution is avoided, the subsequent treatment of the aluminum ash is easy, and the treatment cost of hazardous waste is reduced.
The beneficial technical effects of the invention are as follows:
(1) The refractory material for smelting does not react with the regenerated avionics melt, and impurities are not introduced to pollute the melt in the smelting process;
(2) The deslagging tool does not react with the regenerated avionic aluminum melt, does not adhere to aluminum, does not generate intermetallic compounds with aluminum atoms in the deslagging process, and does not introduce impurities;
(3) The refining does not use a salt refining agent, so that the generation of toxic gases containing chlorine and fluorine and the pollution of salt substances to melt in the refining process of salt are avoided;
(4) Argon refining is adopted, so that the use of a salt refining agent and nitrogen is avoided, the burning loss rate is low, no impurity is introduced, and components are easy to regulate and control;
(5) Because no salt refining agent, chlorine and nitrogen are used, the aluminum ash does not contain salts and the aluminum nitride content is not higher than 0.8wt.%, the aluminum ash belongs to common solid waste and is easy to dispose;
(6) The ultra-clean melt is realized, the number of solid inclusions in the regenerated aviation aluminum melt is detected on line to be not higher than 2000/kgAl, the hydrogen content is not higher than 0.10ml/100gAl, and the requirement of producing aviation aluminum alloy is met;
(7) The refractory material of the smelting furnace and the deslagging tool do not react with the melt, corrosive gases such as chlorine, fluorine and the like are not generated during argon refining, the service life of equipment and tools is long, the maintenance is simple, and the cost is low;
(8) No extra complicated external impurity removing and refining equipment is needed, and industrialization is easy to realize;
(9) Simple process, simple maintenance and low production cost.
Drawings
FIG. 1 is a flow chart of a method for deeply purifying a regenerated avionics melt to avoid the formation of impurities.
FIG. 2 is a schematic diagram of contact angle formed when an aluminum melt contacts a refractory material, where 1 is furnace gas atmosphere, 2 is aluminum melt, 3 is refractory material, σ 1 Sigma, the interfacial tension between the furnace gas and the refractory material 2 Sigma is the interfacial tension between the furnace gas and the aluminum melt 3 Is the interfacial tension between the aluminum melt and the refractory material, θ is the contact angle.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
On the contrary, the invention is intended to cover any alternatives, modifications, equivalents, and variations as may be included within the spirit and scope of the invention as defined by the appended claims. Further, in the following detailed description of the present invention, certain specific details are set forth in order to provide a better understanding of the present invention. The present invention will be fully understood by those skilled in the art without the details described herein.
The implementation of the present invention is described in detail below in conjunction with specific embodiments:
example 1
And smelting the aviation aluminum alloy secondary resource by adopting a smelting furnace taking a magnesium oxide refractory material as a furnace lining. After secondary resources of aviation aluminum alloy are fully melted, after slag skimming and slag dragging are carried out by adopting a graphite tool, after components of the regenerated aviation aluminum melt are regulated and controlled to a qualified range on line, argon with purity not lower than 99.99% is adopted for refining, and then secondary slag skimming is carried out by adopting the graphite tool, so that the deeply purified regenerated aviation aluminum melt is obtained, wherein the hydrogen content (liquid state) is 0.10mL/100gAl, the slag content (on line) is 2000/kgAl, and the burning loss rate is 1.0%. The aluminum ash did not contain salts and the aluminum nitride content was 0.8wt.%.
Example 2
And smelting the aviation aluminum alloy secondary resource by adopting a smelting furnace taking an alumina/magnesia refractory material as a furnace lining. The refractory material is alumina and magnesia, wherein the mass ratio of the alumina is 0.1. After secondary resources of aviation aluminum alloy are fully melted, slag skimming and slag dragging are carried out by adopting a high-temperature alloy tool, after components of the regenerated aviation aluminum melt are regulated and controlled to a qualified range on line, argon with purity not lower than 99.99% is adopted for refining, secondary slag skimming is carried out by adopting the high-temperature alloy tool, and the deeply purified regenerated aviation aluminum melt is obtained, wherein the hydrogen content (liquid state) of the regenerated aviation aluminum melt is 0.10mL/100gAl, the slag content (on line) is 1923/kgAl, and the burning loss rate is 1.0%. The aluminum ash did not contain salts and the aluminum nitride content was 0.8wt.%.
Example 3
And smelting the aviation aluminum alloy secondary resource by adopting a smelting furnace taking an alumina/magnesia refractory material as a furnace lining. The refractory material is alumina and magnesia, wherein the mass ratio of the alumina is 0.1. After secondary resources of aviation aluminum alloy are fully melted, after slag skimming and slag dragging are carried out by adopting a graphite tool, after components of the regenerated aviation aluminum melt are regulated and controlled to a qualified range on line, argon with purity not lower than 99.99% is adopted for refining, and then secondary slag skimming is carried out by adopting the graphite tool, so that the deeply purified regenerated aviation aluminum melt is obtained, wherein the hydrogen content (liquid state) is 0.09mL/100gAl, the slag content (on line) is 1846/kgAl, and the burning loss rate is 1.0%. The aluminum ash did not contain salts and the aluminum nitride content was 0.8wt.%.
Example 4
And smelting the aviation aluminum alloy secondary resource by adopting a smelting furnace taking an alumina/magnesia refractory material as a furnace lining. The refractory material is alumina and magnesia, wherein the mass ratio of the alumina is 0.1. After secondary resources of aviation aluminum alloy are fully melted, slag skimming and slag dragging are carried out by adopting a high-temperature alloy tool, after components of the regenerated aviation aluminum melt are regulated and controlled to a qualified range on line, argon with purity not lower than 99.99% is adopted for refining, secondary slag skimming is carried out by adopting the high-temperature alloy tool, and the deeply purified regenerated aviation aluminum melt is obtained, wherein the hydrogen content (liquid state) of the regenerated aviation aluminum melt is 0.09mL/100gAl, the slag content (on line) is 1769/kgAl, and the burning loss rate is 0.9%. The aluminum ash did not contain salts and the aluminum nitride content was 0.7wt.%.
Example 5
And smelting the aviation aluminum alloy secondary resource by adopting a smelting furnace taking an alumina/magnesia refractory material as a furnace lining. The refractory material is alumina and magnesia, wherein the mass ratio of the alumina is 0.2. After secondary resources of aviation aluminum alloy are fully melted, after slag skimming and slag dragging are carried out by adopting a graphite tool, after components of the regenerated aviation aluminum melt are regulated and controlled to a qualified range on line, argon with purity not lower than 99.99% is adopted for refining, and then secondary slag skimming is carried out by adopting the graphite tool, so that the deeply purified regenerated aviation aluminum melt is obtained, wherein the hydrogen content (liquid state) is 0.09mL/100gAl, the slag content (on line) is 1692/kgAl, and the burning loss rate is 0.9%. The aluminum ash did not contain salts and the aluminum nitride content was 0.7wt.%.
Example 6
And smelting the aviation aluminum alloy secondary resource by adopting a smelting furnace taking aluminum oxide and magnesium oxide refractory materials as furnace linings. The refractory material is alumina and magnesia, wherein the mass ratio of the alumina is 0.2. After secondary resources of aviation aluminum alloy are fully melted, slag skimming and slag dragging are carried out by adopting a high-temperature alloy tool, after components of the regenerated aviation aluminum melt are regulated and controlled to a qualified range on line, argon with purity not lower than 99.99% is adopted for refining, secondary slag skimming is carried out by adopting the high-temperature alloy tool, and the deeply purified regenerated aviation aluminum melt is obtained, wherein the hydrogen content (liquid state) of the regenerated aviation aluminum melt is 0.08mL/100gAl, the slag content (on line) is 1615/kgAl, and the burning loss rate is 0.9%. The aluminum ash did not contain salts and the aluminum nitride content was 0.7wt.%.
Example 7
And smelting the aviation aluminum alloy secondary resource by adopting a smelting furnace taking aluminum oxide and magnesium oxide refractory materials as furnace linings. The refractory material is alumina/magnesia, wherein the mass ratio of the alumina is 0.2. After secondary resources of aviation aluminum alloy are fully melted, after slag skimming and slag dragging are carried out by adopting a graphite tool, after components of the regenerated aviation aluminum melt are regulated and controlled to a qualified range on line, argon with purity not lower than 99.99% is adopted for refining, and then secondary slag skimming is carried out by adopting the graphite tool, so that the deeply purified regenerated aviation aluminum melt is obtained, wherein the hydrogen content (liquid state) is 0.08mL/100gAl, the slag content (on line) is 1538/kgAl, and the burning loss rate is 0.8%. The aluminum ash did not contain salts and the aluminum nitride content was 0.7wt.%.
Example 8
And smelting the aviation aluminum alloy secondary resource by adopting a smelting furnace taking aluminum oxide as a magnesium oxide refractory material as a furnace lining. The refractory material is alumina and magnesia, wherein the mass ratio of the alumina is 0.3. After secondary resources of aviation aluminum alloy are fully melted, slag skimming and slag dragging are carried out by adopting a high-temperature alloy tool, after components of the regenerated aviation aluminum melt are regulated and controlled to a qualified range on line, argon with purity not lower than 99.99% is adopted for refining, secondary slag skimming is carried out by adopting the high-temperature alloy tool, and the deeply purified regenerated aviation aluminum melt is obtained, wherein the hydrogen content (liquid state) of the regenerated aviation aluminum melt is 0.08mL/100gAl, the slag content (on line) is 1461/kgAl, and the burning loss rate is 0.8%. The aluminum ash did not contain salts and the aluminum nitride content was 0.6wt.%.
Example 9
And smelting the aviation aluminum alloy secondary resource by adopting a smelting furnace taking aluminum oxide and magnesium oxide refractory materials as furnace linings. The refractory material is alumina and magnesia, wherein the mass ratio of the alumina is 0.3. After secondary resources of aviation aluminum alloy are fully melted, a graphite tool is adopted for slag skimming and slag dragging, after components of the regenerated aviation aluminum melt are regulated and controlled to a qualified range on line, argon with purity not lower than 99.99% is adopted for refining, and then the graphite tool is adopted for secondary slag skimming, so that the deeply purified regenerated aviation aluminum melt is obtained, wherein the hydrogen content (liquid state) is 0.07mL/100gAl, the slag content (on line) is 1384/kgAl, and the burning loss rate is 0.8%. The aluminum ash did not contain salts and the aluminum nitride content was 0.6wt.%.
Example 10
And smelting the aviation aluminum alloy secondary resource by adopting a smelting furnace taking aluminum oxide and magnesium oxide refractory materials as furnace linings. The refractory material is alumina/magnesia, wherein the mass ratio of the alumina is 0.4. After secondary resources of aviation aluminum alloy are fully melted, slag skimming and slag dragging are carried out by adopting a high-temperature alloy tool, after components of the regenerated aviation aluminum melt are regulated and controlled to a qualified range on line, argon with purity not lower than 99.99% is adopted for refining, secondary slag skimming is carried out by adopting the high-temperature alloy tool, and the deeply purified regenerated aviation aluminum melt is obtained, wherein the hydrogen content (liquid state) of the regenerated aviation aluminum melt is 0.07mL/100gAl, the slag content (on line) is 1307/kgAl, and the burning loss rate is 0.8%. The aluminum ash did not contain salts and the aluminum nitride content was 0.6wt.%.
Example 11
And smelting the aviation aluminum alloy secondary resource by adopting a smelting furnace taking aluminum oxide and magnesium oxide refractory materials as furnace linings. The refractory material is alumina and magnesia, wherein the mass ratio of the alumina is 0.4. After secondary resources of aviation aluminum alloy are fully melted, after slag skimming and slag dragging are carried out by adopting a graphite tool, after components of the regenerated aviation aluminum melt are regulated and controlled to a qualified range on line, argon with purity not lower than 99.99% is adopted for refining, and then secondary slag skimming is carried out by adopting the graphite tool, so that the deeply purified regenerated aviation aluminum melt is obtained, wherein the hydrogen content (liquid state) is 0.06mL/100gAl, the slag content (on line) is 1230/kgAl, and the burning loss rate is 0.7%. The aluminum ash did not contain salts and the aluminum nitride content was 0.5wt.%.
Example 12
And smelting the aviation aluminum alloy secondary resource by adopting a smelting furnace taking aluminum oxide and magnesium oxide refractory materials as furnace linings. The refractory material is alumina and magnesia, wherein the mass ratio of the alumina is 0.4. After secondary resources of aviation aluminum alloy are fully melted, slag skimming and slag dragging are carried out by adopting a high-temperature alloy tool, after components of the regenerated aviation aluminum melt are regulated and controlled to a qualified range on line, argon with purity not lower than 99.99% is adopted for refining, secondary slag skimming is carried out by adopting the high-temperature alloy tool, and the deeply purified regenerated aviation aluminum melt is obtained, wherein the hydrogen content (liquid state) of the regenerated aviation aluminum melt is 0.06mL/100gAl, the slag content (on line) is 1153/kgAl, and the burning loss rate is 0.7%. The aluminum ash did not contain salts and the aluminum nitride content was 0.5wt.%.
Example 13
And smelting the aviation aluminum alloy secondary resource by adopting a smelting furnace taking aluminum oxide and magnesium oxide refractory materials as furnace linings. The refractory material is alumina and magnesia, wherein the mass ratio of the alumina is 0.5. After secondary resources of aviation aluminum alloy are fully melted, after slag skimming and slag dragging are carried out by adopting a graphite tool, after components of the regenerated aviation aluminum melt are regulated and controlled to a qualified range on line, argon with purity not lower than 99.99% is adopted for refining, and then secondary slag skimming is carried out by adopting the graphite tool, so that the deeply purified regenerated aviation aluminum melt is obtained, wherein the hydrogen content (liquid state) is 0.06mL/100gAl, the slag content (on line) is 1076/kgAl, and the burning loss rate is 0.7%. The aluminum ash did not contain salts and the aluminum nitride content was 0.5wt.%.
Example 14
And smelting the aviation aluminum alloy secondary resource by adopting a smelting furnace taking aluminum oxide and magnesium oxide refractory materials as furnace linings. The refractory material is alumina and magnesia, wherein the mass ratio of the alumina is 0.5. After secondary resources of aviation aluminum alloy are fully melted, slag skimming and slag dragging are carried out by adopting a high-temperature alloy tool, after components of the regenerated aviation aluminum melt are regulated and controlled to a qualified range on line, argon with purity not lower than 99.99% is adopted for refining, secondary slag skimming is carried out by adopting the high-temperature alloy tool, and the deeply purified regenerated aviation aluminum melt is obtained, wherein the hydrogen content (liquid state) of the regenerated aviation aluminum melt is 0.05mL/100gAl, the slag content (on line) is 999/kgAl, and the burning loss rate is 0.7%. The aluminum ash did not contain salts and the aluminum nitride content was 0.4wt.%.
Example 15
And smelting the aviation aluminum alloy secondary resource by adopting a smelting furnace taking aluminum oxide and magnesium oxide refractory materials as furnace linings. The refractory material is alumina/magnesia, wherein the mass ratio of the alumina is 0.5. After secondary resources of aviation aluminum alloy are fully melted, after slag skimming and slag dragging are carried out by adopting a graphite tool, after components of the regenerated aviation aluminum melt are regulated and controlled to a qualified range on line, argon with purity not lower than 99.99% is adopted for refining, and then secondary slag skimming is carried out by adopting the graphite tool, so that the deeply purified regenerated aviation aluminum melt is obtained, wherein the hydrogen content (liquid state) is 0.05mL/100gAl, the slag content (on line) is 922/kgAl, and the burning loss rate is 0.6%. The aluminum ash did not contain salts and the aluminum nitride content was 0.4wt.%.
Example 16
And smelting the aviation aluminum alloy secondary resource by adopting a smelting furnace taking aluminum oxide and magnesium oxide refractory materials as furnace linings. The refractory material is alumina and magnesia, wherein the mass ratio of the alumina is 0.6. After secondary resources of aviation aluminum alloy are fully melted, slag skimming and slag dragging are carried out by adopting a high-temperature alloy tool, after components of the regenerated aviation aluminum melt are regulated and controlled to a qualified range on line, argon with purity not lower than 99.99% is adopted for refining, secondary slag skimming is carried out by adopting the high-temperature alloy tool, and the deeply purified regenerated aviation aluminum melt is obtained, wherein the hydrogen content (liquid state) of the regenerated aviation aluminum melt is 0.05mL/100gAl, the slag content (on line) is 845/kgAl, and the burning loss rate is 0.6%. The aluminum ash did not contain salts and the aluminum nitride content was 0.4wt.%.
Example 17
And smelting the aviation aluminum alloy secondary resource by adopting a smelting furnace taking aluminum oxide and magnesium oxide refractory materials as furnace linings. The refractory material is alumina and magnesia, wherein the mass ratio of the alumina is 0.6. After secondary resources of aviation aluminum alloy are fully melted, after slag skimming and slag dragging are carried out by adopting a graphite tool, after components of the regenerated aviation aluminum melt are regulated and controlled to a qualified range on line, argon with purity not lower than 99.99% is adopted for refining, and then secondary slag skimming is carried out by adopting the graphite tool, so that the deeply purified regenerated aviation aluminum melt is obtained, wherein the hydrogen content (liquid state) is 0.04mL/100gAl, the slag content (on line) is 768/kgAl, and the burning loss rate is 0.6%. The aluminum ash did not contain salts and the aluminum nitride content was 0.3wt.%.
Example 18
And smelting the aviation aluminum alloy secondary resource by adopting a smelting furnace taking aluminum oxide and magnesium oxide refractory materials as furnace linings. The refractory material is alumina and magnesia, wherein the mass ratio of the alumina is 0.6. After secondary resources of aviation aluminum alloy are fully melted, slag skimming and slag dragging are carried out by adopting a high-temperature alloy tool, after components of the regenerated aviation aluminum melt are regulated and controlled to a qualified range on line, argon with purity not lower than 99.99% is adopted for refining, secondary slag skimming is carried out by adopting the high-temperature alloy tool, and the deeply purified regenerated aviation aluminum melt is obtained, wherein the hydrogen content (liquid state) of the regenerated aviation aluminum melt is 0.04mL/100gAl, the slag content (on line) is 691/kgAl, and the burning loss rate is 0.6%. The aluminum ash did not contain salts and the aluminum nitride content was 0.3wt.%.
Example 19
And smelting the aviation aluminum alloy secondary resource by adopting a smelting furnace taking aluminum oxide and magnesium oxide refractory materials as furnace linings. The refractory material is alumina/magnesia, wherein the mass ratio of the alumina is 0.7. After secondary resources of aviation aluminum alloy are fully melted, after slag skimming and slag dragging are carried out by adopting a graphite tool, after components of the regenerated aviation aluminum melt are regulated and controlled to a qualified range on line, argon with purity not lower than 99.99% is adopted for refining, and then secondary slag skimming is carried out by adopting the graphite tool, so that the deeply purified regenerated aviation aluminum melt is obtained, wherein the hydrogen content (liquid state) is 0.04mL/100gAl, the slag content (on line) is 614/kgAl, and the burning loss rate is 0.5%. The aluminum ash did not contain salts and the aluminum nitride content was 0.3wt.%.
Example 20
And smelting the aviation aluminum alloy secondary resource by adopting a smelting furnace taking aluminum oxide and magnesium oxide refractory materials as furnace linings. The refractory material is alumina and magnesia, wherein the mass ratio of the alumina is 0.7. After secondary resources of aviation aluminum alloy are fully melted, slag skimming and slag dragging are carried out by adopting a high-temperature alloy tool, after components of the regenerated aviation aluminum melt are regulated and controlled to a qualified range on line, argon with purity not lower than 99.99% is adopted for refining, secondary slag skimming is carried out by adopting the high-temperature alloy tool, and the deeply purified regenerated aviation aluminum melt is obtained, wherein the hydrogen content (liquid state) of the regenerated aviation aluminum melt is 0.03mL/100gAl, the slag content (on line) is 537/kgAl, and the burning loss rate is 0.5%. The aluminum ash did not contain salts and the aluminum nitride content was 0.3wt.%.
Example 21
And smelting the aviation aluminum alloy secondary resource by adopting a smelting furnace taking aluminum oxide and magnesium oxide refractory materials as furnace linings. The refractory material is alumina and magnesia, wherein the mass ratio of the alumina is 0.8. After secondary resources of aviation aluminum alloy are fully melted, after slag skimming and slag dragging are carried out by adopting a graphite tool, after components of the regenerated aviation aluminum melt are regulated and controlled to a qualified range on line, argon with purity not lower than 99.99% is adopted for refining, and then secondary slag skimming is carried out by adopting the graphite tool, so that the deeply purified regenerated aviation aluminum melt is obtained, wherein the hydrogen content (liquid state) is 0.03mL/100gAl, the slag content (on line) is 460/kgAl, and the burning loss rate is 0.5%. The aluminum ash did not contain salts and the aluminum nitride content was 0.2wt.%.
Example 22
And smelting the aviation aluminum alloy secondary resource by adopting a smelting furnace taking aluminum oxide and magnesium oxide refractory materials as furnace linings. The refractory material is alumina/magnesia, wherein the mass ratio of the alumina is 0.8. After secondary resources of aviation aluminum alloy are fully melted, slag skimming and slag dragging are carried out by adopting a high-temperature alloy tool, after components of the regenerated aviation aluminum melt are regulated and controlled to a qualified range on line, argon with purity not lower than 99.99% is adopted for refining, secondary slag skimming is carried out by adopting the high-temperature alloy tool, and the deeply purified regenerated aviation aluminum melt is obtained, wherein the hydrogen content (liquid state) of the regenerated aviation aluminum melt is 0.02mL/100gAl, the slag content (on line) is 383/kg Al, and the burning loss rate is 0.5%. The aluminum ash did not contain salts and the aluminum nitride content was 0.2wt.%.
EXAMPLE 23
And smelting the aviation aluminum alloy secondary resource by adopting a smelting furnace taking aluminum oxide and magnesium oxide refractory materials as furnace linings. The refractory material is alumina and magnesia, wherein the mass ratio of the alumina is 0.9. After secondary resources of aviation aluminum alloy are fully melted, a graphite tool is adopted for slag skimming and slag dragging, after components of the regenerated aviation aluminum melt are regulated and controlled to a qualified range on line, argon with purity not lower than 99.99% is adopted for refining, and then the graphite tool is adopted for secondary slag skimming, so that the deeply purified regenerated aviation aluminum melt is obtained, wherein the hydrogen content (liquid state) is 0.02mL/100gAl, the slag content (on line) is 306/kgAl, and the burning loss rate is 0.4%. The aluminum ash did not contain salts and the aluminum nitride content was 0.2wt.%.
EXAMPLE 24
And smelting the aviation aluminum alloy secondary resource by adopting a smelting furnace taking aluminum oxide and magnesium oxide refractory materials as furnace linings. The refractory material is alumina/magnesia, wherein the mass ratio of the alumina is 0.9. After secondary resources of aviation aluminum alloy are fully melted, slag skimming and slag dragging are carried out by adopting a high-temperature alloy tool, after components of the regenerated aviation aluminum melt are regulated and controlled to a qualified range on line, argon with purity not lower than 99.99% is adopted for refining, secondary slag skimming is carried out by adopting the high-temperature alloy tool, and the deeply purified regenerated aviation aluminum melt is obtained, wherein the hydrogen content (liquid state) of the regenerated aviation aluminum melt is 0.02mL/100gAl, the slag content (on line) is 229/kgAl, and the burning loss rate is 0.4%. The aluminum ash did not contain salts and the aluminum nitride content was 0.1wt.%.
Example 25
And smelting the aviation aluminum alloy secondary resource by adopting a smelting furnace taking an alumina refractory material as a furnace lining. After secondary resources of aviation aluminum alloy are fully melted, after slag skimming and slag dragging are carried out by adopting a graphite tool, after components of the regenerated aviation aluminum melt are regulated and controlled to a qualified range on line, argon with purity not lower than 99.99% is adopted for refining, and then secondary slag skimming is carried out by adopting the graphite tool, so that the deeply purified regenerated aviation aluminum melt is obtained, wherein the hydrogen content (liquid state) is 0.01mL/100gAl, the slag content (on line) is 152/kgAl, and the burning loss rate is 0.4%. The aluminum ash did not contain salts and the aluminum nitride content was 0.1wt.%.
EXAMPLE 26
And smelting the aviation aluminum alloy secondary resource by adopting a smelting furnace taking an alumina refractory material as a furnace lining. After secondary resources of aviation aluminum alloy are fully melted, slag skimming and slag dragging are carried out by adopting a high-temperature alloy tool, after components of the regenerated aviation aluminum melt are regulated and controlled to a qualified range on line, argon with purity not lower than 99.99% is adopted for refining, secondary slag skimming is carried out by adopting the high-temperature alloy tool, and the deeply purified regenerated aviation aluminum melt is obtained, wherein the hydrogen content (liquid state) of the regenerated aviation aluminum melt is 0.01mL/100gAl, the slag content (on line) is 75/kgAl, and the burning loss rate is 0.4%. The aluminum ash did not contain salts and the aluminum nitride content was 0.1wt.%.

Claims (6)

1. A method for deeply purifying a regenerated avionic aluminum melt for avoiding impurity generation is characterized in that a pollution-free smelting, pollution-free deslagging and pollution-free refining mode is adopted in the smelting process of the regenerated avionic aluminum melt, and the regenerated avionic aluminum melt with high purity and low impurity content is obtained after refining.
2. The method for deeply purifying a regenerated avionics melt to avoid impurity generation according to claim 1, wherein the pollution-free smelted refractory is made of one or two of alumina and magnesia, and the mass ratio of the alumina is 0-1.0.
3. The method for deeply purifying the regenerated avionics melt to avoid impurity generation according to claim 1, wherein the pollution-free deslagging adopts a tool of graphite or high-temperature alloy for deslagging and slag dragging.
4. The method for deeply purifying a regenerated avionics melt to avoid impurity formation according to claim 1, wherein the pollution-free refining is performed with argon gas having a purity of not less than 99.99%.
5. The method for deeply purifying the regenerated avionic aluminum melt, which is used for avoiding the generation of impurities, according to claim 1, wherein the hydrogen content (liquid state) of the purified regenerated avionic aluminum melt is less than or equal to 0.10mL/100gAl, the slag content (on-line) is less than or equal to 2000/kgAl, and the requirement of the avionic aluminum alloy is met.
6. The method for deeply purifying a regenerated avionic aluminum melt to avoid generation of impurities according to claim 1 and claim 4, wherein the burning loss rate of the regenerated avionic aluminum in the smelting process is 0.4-1.0%, and the aluminum nitride content in the aluminum ash is not higher than 0.8wt.%.
CN202211490830.8A 2022-11-25 2022-11-25 Method for deeply purifying regenerated avionics melt to avoid impurity generation Pending CN116121538A (en)

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