CN117363920A - Preparation method for removing transition group metal from regenerated aluminum alloy - Google Patents
Preparation method for removing transition group metal from regenerated aluminum alloy Download PDFInfo
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 102
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 33
- 230000007704 transition Effects 0.000 title claims abstract description 31
- 239000002184 metal Substances 0.000 title claims abstract description 28
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 55
- 239000000956 alloy Substances 0.000 claims abstract description 55
- 239000012535 impurity Substances 0.000 claims abstract description 39
- 239000000155 melt Substances 0.000 claims abstract description 37
- 238000007670 refining Methods 0.000 claims abstract description 35
- 150000002739 metals Chemical class 0.000 claims abstract description 18
- 238000001914 filtration Methods 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000005266 casting Methods 0.000 claims abstract description 13
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052796 boron Inorganic materials 0.000 claims abstract description 12
- 238000002844 melting Methods 0.000 claims abstract description 5
- 230000008018 melting Effects 0.000 claims abstract description 5
- 239000002244 precipitate Substances 0.000 claims abstract description 5
- 230000006641 stabilisation Effects 0.000 claims abstract description 3
- 238000011105 stabilization Methods 0.000 claims abstract description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 51
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 51
- DJPURDPSZFLWGC-UHFFFAOYSA-N alumanylidyneborane Chemical compound [Al]#B DJPURDPSZFLWGC-UHFFFAOYSA-N 0.000 claims description 30
- 229910052723 transition metal Inorganic materials 0.000 claims description 6
- 150000003624 transition metals Chemical class 0.000 claims description 4
- 230000008569 process Effects 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 description 28
- 239000007788 liquid Substances 0.000 description 16
- 239000003795 chemical substances by application Substances 0.000 description 10
- 238000003825 pressing Methods 0.000 description 10
- 239000002893 slag Substances 0.000 description 10
- 239000011888 foil Substances 0.000 description 9
- 238000003756 stirring Methods 0.000 description 9
- 239000010936 titanium Substances 0.000 description 9
- 239000010949 copper Substances 0.000 description 7
- 239000000126 substance Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 229910052719 titanium Inorganic materials 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 238000003723 Smelting Methods 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- 229910052720 vanadium Inorganic materials 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000007716 flux method Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000010183 spectrum analysis Methods 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- BHHYHSUAOQUXJK-UHFFFAOYSA-L zinc fluoride Chemical compound F[Zn]F BHHYHSUAOQUXJK-UHFFFAOYSA-L 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052728 basic metal Inorganic materials 0.000 description 1
- 150000003818 basic metals Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000013100 final test Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
-
- 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
Abstract
The invention discloses a preparation method for removing transition group metals from a regenerated aluminum alloy, which comprises the following steps: heating and melting aluminum alloy to be melted to a first temperature interval for stabilization, and adding a refining agent for refining and deslagging; and step two, adding a boron-containing intermediate alloy after the temperature of the melt is stabilized in a second temperature range, standing, preserving heat, filtering to remove impurity precipitates, and casting into ingots. The invention has the characteristics of simple process, low cost, low equipment requirement and the like, and can meet the requirement of industrialized mass production.
Description
Technical Field
The invention relates to the technical field of aluminum alloy, in particular to a preparation method for removing transition group metals from a regenerated aluminum alloy.
Background
The aluminum alloy has low density, high corrosion resistance, excellent electric conduction and heat conduction properties and good processability, and the aluminum alloy gradually become the world second largest basic metal material and are widely applied to the fields of transportation, mechanical manufacturing, aerospace and the like. The efficient utilization of limited aluminum alloy resources has important significance. Because the aluminum alloy has high recycling property, the recycled aluminum alloy becomes an indispensable component in the industrial production of the aluminum alloy, and the recycling of the aluminum and the aluminum alloy can bring various remarkable benefits. In the aspect of environment, the carbon dioxide emission of the production of the regenerated aluminum can be reduced by more than 90 percent compared with that of the original aluminum. The energy consumption for producing the regenerated aluminum can be reduced by 95% compared with the original aluminum, thereby greatly saving resources and energy sources and reducing the production cost. However, other metal impurities, such as Ti, V, cr, zr, etc., are often mixed in the secondary aluminum alloy, adversely affecting the performance of the secondary aluminum alloy, thereby limiting its application range. Therefore, to develop high-performance secondary aluminum alloys, it is critical to efficiently remove harmful impurity elements in the alloys. The method for removing the impurities of the regenerated aluminum alloy comprises a filtration method, a gas adsorption method, an electromagnetic separation method, a flux method and the like. The flux method has the advantages of convenient and simple operation, low production cost and wider application range, and the common flux comprises a refining agent, a slag remover and the like, so that impurity elements and refined grains can be effectively removed.
Chinese patent document CN111549237A discloses a method for separating iron element impurities from regenerated aluminum melt by pulse current, which achieves the aim of purifying the aluminum melt by electromigration of Al element and Fe element in different directions under the action of the pulse current. Chinese patent document CN113308619a discloses a regenerated aluminum alloy dezincification agent and a dezincification method thereof, which react fluoride with zinc impurities in an aluminum alloy liquid to generate zinc fluoride with high melting point and high density by adding the invented dezincification agent, and then precipitate at the bottom of the aluminum alloy liquid to precipitate and remove the zinc impurities. Chinese patent document CN103882250B discloses a regenerated aluminum alloy magnesium removal flux and a preparation method thereof, wherein the magnesium removal flux is uniformly mixed and then sprayed into aluminum liquid by inert gas, so that the magnesium removal effect is achieved. However, the presence of some transition group metal elements such as Ti, V, cr, zr and the like can adversely affect the electrical conductivity of the reclaimed aluminum alloy. However, the prior art for removing the transition metal element in the regenerated aluminum alloy has less information and lacks a mature and efficient transition metal removal process.
Disclosure of Invention
The invention designs and develops a preparation method for removing transition group metal from a regenerated aluminum alloy, and aims to solve the problems of low recycling rate and complex process of the method for removing transition group metal impurities in the regenerated aluminum alloy without adding other impurity metal elements.
The technical scheme provided by the invention is as follows:
the preparation method for removing transition group metals from the regenerated aluminum alloy comprises the following steps:
heating and melting aluminum alloy to be melted to a first temperature interval for stabilization, and adding a refining agent for refining and deslagging;
and step two, adding a boron-containing intermediate alloy after the temperature of the melt is stabilized in a second temperature range, standing, preserving heat, filtering to remove impurity precipitates, and casting into ingots.
Preferably, in the first step, the adding amount of the refining agent is 0.4% -0.5% of the mass of the aluminum alloy to be smelted.
Preferably, in the second step, the boron-containing master alloy includes an aluminum-boron master alloy and/or an Al-Ti-B-C master alloy.
Preferably, in the second step, the addition amount of the aluminum-boron intermediate alloy is 0-12% of the mass of the aluminum alloy to be smelted.
Preferably, in the second step, the addition amount of the Al-Ti-B-C intermediate alloy is 0.2% of the mass of the aluminum alloy to be smelted.
Preferably, in the first step, the first temperature range is 730-750 ℃.
Preferably, in the first step, the temperature is kept for 20-30min after the heating and melting are carried out until the first temperature interval is stable.
Preferably, in the second step, the second temperature range is 720-730 ℃.
Preferably, in the second step, the temperature is kept for 30-40min after the temperature of the melt is stabilized in the second temperature interval.
Preferably, the refining agent is C 2 Cl 6 。
The beneficial effects of the invention are as follows:
1. the preparation method of the regenerated aluminum alloy for removing transition group metal comprises the steps of adding an aluminum-boron intermediate alloy and an Al-Ti-B-C intermediate alloy into an aluminum melt, and leading the intermediate alloyThe introduced boron element forms TiB from impurity Ti, V, cr, zr which affects conductivity 2 、CrB 2 、VB 2 、ZrB 2 The substances are separated out from the matrix, the density of the separated out substances is higher, the separated out substances are finally deposited at the bottom of the melt, and the separated out substances are removed by filtration. In addition, the excessive Ti in the melt can realize doping of other elements, so that the Ti is changed into precipitate to be separated out. C diffuses out excessive Ti atoms to be used as a matrix compound doped with other transition group metals;
2. the preparation method for removing the transition group metal from the regenerated aluminum alloy provided by the invention is a method for removing the transition group metal element from the regenerated aluminum alloy, which has the advantages of lower cost, good impurity removing effect and more environmental protection, and aims to remove the transition group metal elements such as Ti, V, cr, zr and the like in the recovered aluminum;
3. the preparation method for removing the transition group metal from the regenerated aluminum alloy has the characteristics of simple process, low cost, low equipment requirement and the like, and can meet the requirement of industrial mass production.
Drawings
FIG. 1 is a graph of the addition amount of an aluminum-boron intermediate alloy to the conductivity of a regenerated aluminum alloy in the preparation method for removing transition group metals of the regenerated aluminum alloy.
Fig. 2 is a graph of the conductivity of examples 3, 7 and 8 according to the present invention.
Detailed Description
The present invention is described in further detail below with reference to the drawings to enable those skilled in the art to practice the invention by referring to the description.
The invention provides a preparation method for removing transition group metals from a regenerated aluminum alloy, which uses a boron-containing intermediate alloy for precipitation removal; as a preferred, the boron-containing master alloy may contain both an aluminum-boron master alloy and an al—ti-B-C master alloy, or an aluminum-boron master alloy or an al—ti-B-C master alloy may be used alone; wherein the content of boron in the aluminum-boron intermediate alloy is 1-3%; the Al-Ti-B-C intermediate alloy comprises the following elements in percentage by mass: 3-5% of titanium, 0.2-0.8% of boron, 0.1-0.2% of carbon and the balance of aluminum;
the method specifically comprises the following steps:
smelting waste aluminum alloy: weighing a certain mass of aluminum alloy to be smelted, putting the aluminum alloy into a smelting furnace, heating the aluminum alloy smelting furnace to 700-750 ℃ for smelting, and smelting aluminum alloy raw materials into aluminum alloy liquid;
step two, refining and deslagging of aluminum melt: after the temperature of the melt is stabilized at 730-750 ℃, adding a refining agent into the aluminum alloy liquid, pressing the refining agent into the aluminum alloy liquid by using a bell jar, preserving heat for 20-30min, and refining and deslagging the aluminum alloy liquid; wherein the adding amount of the refining agent is 0.4-0.5% of the mass of the aluminum alloy to be smelted;
step three, removing transition group metal elements: after the temperature of the melt is stabilized at 720-730 ℃, adding a boron-containing intermediate alloy, standing and preserving the temperature for 30-40min to precipitate the impurities of the transition metal elements, filtering and removing, and finally casting into ingots; the boron-containing intermediate alloy comprises an aluminum-boron intermediate alloy, an Al-Ti-B-C intermediate alloy or a mixture of the aluminum-boron intermediate alloy and the Al-Ti-B-C intermediate alloy, wherein the addition amount of the aluminum-boron intermediate alloy is 0-12% of the mass of the aluminum alloy to be smelted, and the addition amount of the Al-Ti-B-C intermediate alloy is 0.2% of the mass of the aluminum alloy to be smelted.
In another embodiment, the refining agent is C 2 Cl 6 。
Example 1
The preparation method for removing transition group metals from the regenerated aluminum alloy uses 0.4 mass percent (calculated by the mass of the waste aluminum alloy) of aluminum-boron intermediate alloy, and comprises the following steps:
step one, placing the waste aluminum alloy into a crucible, and heating to 700-750 ℃ until the waste aluminum alloy is melted;
refining at 730-750deg.C, and wrapping with aluminum foil 2 Cl 6 Adding into molten aluminum, C 2 Cl 6 The addition amount of (2) is 0.4-0.5% of the mass of the melt. Pressing the aluminum melt into the molten liquid by using a bell jar, preserving heat for 20-30min, refining the aluminum melt and removing slag;
thirdly, adding the aluminum-boron intermediate alloy when the temperature is stabilized at about 720-730 ℃, slowly stirring the melt to uniformly distribute the melt, standing and preserving heat for 30-40min to precipitate impurities, filtering and removing the impurities, and finally casting into ingots.
Example 2
The preparation method for removing transition group metals from the regenerated aluminum alloy uses an aluminum-boron intermediate alloy with the mass percentage of 1% (calculated by the mass of the waste aluminum alloy) and comprises the following steps:
step one, placing the waste aluminum alloy into a crucible, and heating to 700-750 ℃ until the waste aluminum alloy is melted;
refining at 730-750deg.C, and wrapping with aluminum foil 2 Cl 6 Adding into molten aluminum, C 2 Cl 6 The addition amount of (2) is 0.4-0.5% of the mass of the melt. Pressing the aluminum melt into the molten liquid by using a bell jar, preserving heat for 20-30min, refining the aluminum melt and removing slag;
thirdly, adding the aluminum-boron intermediate alloy when the temperature is stabilized at about 720-730 ℃, slowly stirring the melt to uniformly distribute the melt, standing and preserving heat for 30-40min to precipitate impurities, filtering and removing the impurities, and finally casting into ingots.
Example 3
The preparation method for removing transition group metals from the regenerated aluminum alloy uses an aluminum-boron intermediate alloy with the mass percentage of 2% (calculated by the mass of the waste aluminum alloy) and comprises the following steps:
step one, placing the waste aluminum alloy into a crucible, and heating to 700-750 ℃ until the waste aluminum alloy is melted;
refining at 730-750deg.C, and wrapping with aluminum foil 2 Cl 6 Adding into molten aluminum, C 2 Cl 6 The addition amount of (2) is 0.4-0.5% of the mass of the melt. Pressing the aluminum melt into the molten liquid by using a bell jar, preserving heat for 20-30min, refining the aluminum melt and removing slag;
thirdly, adding the aluminum-boron intermediate alloy when the temperature is stabilized at about 720-730 ℃, slowly stirring the melt to uniformly distribute the melt, standing and preserving heat for 30-40min to precipitate impurities, filtering and removing the impurities, and finally casting into ingots.
Example 4
The preparation method for removing transition group metals from the regenerated aluminum alloy uses an aluminum-boron intermediate alloy with the mass percentage of 4% (calculated by the mass of the waste aluminum alloy) and comprises the following steps:
step one, placing the waste aluminum alloy into a crucible, and heating to 700-750 ℃ until the waste aluminum alloy is melted;
refining at 730-750deg.C, and wrapping with aluminum foil 2 Cl 6 Adding into molten aluminum, C 2 Cl 6 The addition amount of (2) is 0.4-0.5% of the mass of the melt. Pressing the aluminum melt into the molten liquid by using a bell jar, preserving heat for 20-30min, refining the aluminum melt and removing slag;
thirdly, adding the aluminum-boron intermediate alloy when the temperature is stabilized at about 720-730 ℃, slowly stirring the melt to uniformly distribute the melt, standing and preserving heat for 30-40min to precipitate impurities, filtering and removing the impurities, and finally casting into ingots.
Example 5
The preparation method for removing transition group metals from the regenerated aluminum alloy uses 8 percent by mass (calculated by mass of waste aluminum alloy) of aluminum-boron intermediate alloy, and comprises the following steps:
step one, placing the waste aluminum alloy into a crucible, and heating to 700-750 ℃ until the waste aluminum alloy is melted;
refining at 730-750deg.C, and wrapping with aluminum foil 2 Cl 6 Adding into molten aluminum, C 2 Cl 6 The addition amount of (2) is 0.4-0.5% of the mass of the melt. Pressing the aluminum melt into the molten liquid by using a bell jar, preserving heat for 20-30min, refining the aluminum melt and removing slag;
thirdly, adding the aluminum-boron intermediate alloy when the temperature is stabilized at about 720-730 ℃, slowly stirring the melt to uniformly distribute the melt, standing and preserving heat for 30-40min to precipitate impurities, filtering and removing the impurities, and finally casting into ingots.
Example 6
The preparation method for removing transition group metals from the regenerated aluminum alloy uses an aluminum-boron intermediate alloy with the mass percentage of 12% (calculated by the mass of the waste aluminum alloy) and comprises the following steps:
step one, placing the waste aluminum alloy into a crucible, and heating to 700-750 ℃ until the waste aluminum alloy is melted;
refining at 730-750deg.C, and wrapping with aluminum foil 2 Cl 6 Adding into molten aluminum, C 2 Cl 6 The addition amount of (2) is 0.4-0.5% of the mass of the melt. Pressing the aluminum melt into the molten liquid by using a bell jar, preserving heat for 20-30min, refining the aluminum melt and removing slag;
thirdly, adding the aluminum-boron intermediate alloy when the temperature is stabilized at about 720-730 ℃, slowly stirring the melt to uniformly distribute the melt, standing and preserving heat for 30-40min to precipitate impurities, filtering and removing the impurities, and finally casting into ingots.
Example 7
A preparation method for removing transition group metals from a regenerated aluminum alloy uses an Al-Ti-B-C intermediate alloy with the mass percentage of 0.2% (calculated by the mass of waste aluminum alloy), and comprises the following steps:
step one, placing the waste aluminum alloy into a crucible, and heating to 700-750 ℃ until the waste aluminum alloy is melted;
refining at 730-750deg.C, and wrapping with aluminum foil 2 Cl 6 Adding into molten aluminum, C 2 Cl 6 The addition amount of (2) is 0.4-0.5% of the mass of the melt. Pressing the aluminum melt into the molten liquid by using a bell jar, preserving heat for 20-30min, refining the aluminum melt and removing slag;
thirdly, adding the aluminum-boron intermediate alloy when the temperature is stabilized at about 720-730 ℃, slowly stirring the melt to uniformly distribute the melt, standing and preserving heat for 30-40min to precipitate impurities, filtering and removing the impurities, and finally casting into ingots.
Example 8
A preparation method for removing transition group metals from a regenerated aluminum alloy uses an aluminum-boron intermediate alloy with a mass percentage of 2% (calculated by mass of waste aluminum alloy) and an Al-Ti-B-C intermediate alloy with a mass percentage of 0.2% (calculated by mass of waste aluminum alloy), and comprises the following steps:
step one, placing the waste aluminum alloy into a crucible, and heating to 700-750 ℃ until the waste aluminum alloy is melted;
refining at 730-750deg.C, and wrapping with aluminum foil 2 Cl 6 Adding into molten aluminum, C 2 Cl 6 The addition amount of (2) is 0.4-0.5% of the mass of the melt. Pressing the aluminum melt into the molten liquid by using a bell jar, preserving heat for 20-30min, refining the aluminum melt and removing slag;
thirdly, adding the aluminum-boron intermediate alloy when the temperature is stabilized at about 720-730 ℃, slowly stirring the melt to uniformly distribute the melt, standing and preserving heat for 30-40min to precipitate impurities, filtering and removing the impurities, and finally casting into ingots.
Comparative example
The preparation method for removing transition group metals from the regenerated aluminum alloy comprises the following steps:
step one, placing the waste aluminum alloy into a crucible, and heating to 700-750 ℃ until the waste aluminum alloy is melted;
refining at 730-750deg.C, and wrapping with aluminum foil 2 Cl 6 Adding into molten aluminum, C 2 Cl 6 The addition amount of (2) is 0.4-0.5% of the mass of the melt. Pressing the aluminum melt into the molten liquid by using a bell jar, preserving heat for 20-30min, refining the aluminum melt and removing slag;
thirdly, adding the aluminum-boron intermediate alloy when the temperature is stabilized at about 720-730 ℃, slowly stirring the melt to uniformly distribute the melt, standing and preserving heat for 30-40min to precipitate impurities, filtering and removing the impurities, and finally casting into ingots.
Test case
According to the invention, through adjusting the use amounts of the aluminum-boron intermediate alloy and the Al-Ti-B-C, transition group metal elements such as Ti, V, cr, zr and the like can be removed, and the test impurity removal effect is as follows:
conductivity test the conductivity is tested according to national standard GB3048.2-83 electric wire and cable metal conductor material resistivity test method, and the resistivity tester firstly measures the resistance value and then converts the resistance value into conductivity. After a sample with the diameter of 10mm multiplied by 200mm is machined, the surface oxide film is removed, the resistance is measured by a four-electrode method, and then the conductivity of the sample is obtained through unit conversion. IEC 60028.1925 specifies that standard annealed copper has a conductivity of 58MS/m, a conductivity of 100% IACS (International annealed copper Standard), a resistivity value of the reciprocal of the conductivity of 17.241nΩ & m at 20 ℃.
The conductivity unit of the conductor material is%IACS, which is the percentage value of the conductivity of the tested conductor material and the conductivity of the international standard annealed copper. The method comprises the following steps of:
wherein: c (C) 1 The electrical conductivity of the sample to be measured is given in% IACS. Sigma (sigma) 1 、σ Cu The conductivity of the sample to be measured and the standard annealed copper are respectively shown in MS/m. ρ 1 、ρ Cu The resistivity of the measured sample and the standard annealed copper are respectively represented by nΩ·m.
And the MAXx Spectro Kleve spectrometer is used for measuring the actual chemical components of the prepared alloy sample, and in view of the sensitivity of excitation of a spectrum signal to an oxide film, water stain, oil stain and the like on the surface of the sample, a lathe is used for turning a sample test surface before the test, and the surface of the sample is kept smooth, clean and pollution-free in the cutting process.
And selecting 3 different positions on the tested surface, and taking an average value as final test data according to the test result.
As shown in fig. 1 and 2, in the invention, better electric conductivity can be obtained by using the aluminum-boron intermediate alloy and the Al-Ti-B-C intermediate alloy and adjusting the using amount.
As shown in tables 1 and 2, in examples 3 and 8, after impurity removal and filtration, the upper and bottom portions of the aluminum alloy finally cast into ingots were subjected to spectral analysis and sampling, and it was apparent from comparison analysis of comparative examples of experiments on samples not subjected to impurity removal that some impurities remained in the melt, but some impurities settled on the bottom portion of the aluminum alloy finally cast into ingots, and a good impurity removal effect was achieved.
TABLE 1 Spectrum analysis Table of chemical composition in reclaimed aluminum alloy
TABLE 2 spectroscopic analysis of major transition group elements in reclaimed aluminum alloys (Unit: ppm)
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the invention would be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (10)
1. The preparation method for removing transition group metals from the regenerated aluminum alloy is characterized by comprising the following steps of:
heating and melting aluminum alloy to be melted to a first temperature interval for stabilization, and adding a refining agent for refining and deslagging;
and step two, adding a boron-containing intermediate alloy after the temperature of the melt is stabilized in a second temperature range, standing, preserving heat, filtering to remove impurity precipitates, and casting into ingots.
2. The method for producing a secondary aluminum alloy-removed transition metal as claimed in claim 1, wherein in said step one, the amount of the refining agent added is 0.4% -0.5% by mass of the aluminum alloy to be melted.
3. The method for producing a secondary aluminum alloy from which transition group metals are removed as claimed in claim 1 or 2, wherein in the second step, the boron-containing master alloy comprises an aluminum-boron master alloy and/or an Al-Ti-B-C master alloy.
4. A method for producing a secondary aluminum alloy-removed transition metal as claimed in claim 3, characterized in that in said step two, the addition amount of the aluminum-boron intermediate alloy is 0 to 12% by mass of the aluminum alloy to be melted.
5. A method for producing a secondary aluminum alloy-removed transition metal as claimed in claim 3, characterized in that in said step two, the addition amount of the Al-Ti-B-C intermediate alloy is 0.2% by mass of the aluminum alloy to be melted.
6. The method for producing a secondary aluminum alloy according to claim 1, wherein in the first step, the first temperature range is 730 to 750 ℃.
7. The method for producing a secondary aluminum alloy as defined in claim 6, wherein in the first step, the secondary aluminum alloy is heated and melted until the first temperature range is stabilized, and then the secondary aluminum alloy is kept at the first temperature range for 20 to 30 minutes.
8. The method for producing a secondary aluminum alloy as claimed in claim 1, wherein in the second step, the second temperature range is 720 to 730 ℃.
9. The method for preparing a regenerated aluminum alloy for removing transition group metals according to claim 8, wherein in the second step, the temperature is maintained for 30-40min after the temperature of the melt is stabilized in the second temperature range.
10. The method for producing a secondary aluminum alloy as claimed in any one of claims 1, 2, 4 to 9, wherein the refining agent is C 2 Cl 6 。
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