CN115233016A - Al-50Sn alloy based aluminum melt iron removal method - Google Patents
Al-50Sn alloy based aluminum melt iron removal method Download PDFInfo
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Abstract
The invention discloses an Al-50Sn alloy-based aluminum melt iron removal method, which takes Al-50Sn alloy as an iron removal agent, the aluminum melt is aluminum with high iron content, the iron removal method is a flux method, and the basic principle is that by introducing Sn element, sn phase is formed and attached to beta-Fe phase, so that the Fe-rich phase is promoted to be settled, and the Fe-rich phase in the alloy is mainly gathered at the bottom; the iron removal rate is 31.0-43.0%. The method comprises the following steps: 1, preparing raw materials; and 2, iron removal operation of the aluminum melt. The invention has the following advantages: 1. by introducing Sn element, the Sn phase only acts with the Fe-rich phase and is attached to the Fe-rich phase, so that the Fe-rich phase is promoted to be settled, and the iron content at the top is reduced; 2. the introduced Sn is attached to the Fe-rich phase, is stable at high temperature and cannot be decomposed; 3. the iron removing effect is stable and efficient for the aluminum alloy with high Fe content; 4. the process is simple. Therefore, the iron removal method used by the invention has an iron removal effect on the aluminum melt.
Description
Technical Field
The invention relates to the technical field of alloy iron removal, in particular to an Al-50Sn alloy based aluminum melt iron removal method.
Background
The impurity iron in aluminum has a complex source and has three main aspects: firstly, the mined aluminum ore contains a certain amount of iron element; secondly, in the actual aluminum processing process, an iron tool cannot be separated, so that iron elements in the workpiece permeate into aluminum alloy; thirdly, the recycled aluminum continuously accumulates impurity iron in aluminum and aluminum alloy in the recycling production process to reach higher content.
In the conventional iron removal method for the aluminum alloy, the gravity settling method consumes long time, and the centrifugal separation method is inconvenient to operate; the cold speed method is improved and lacks of practical production operability; the electromagnetic separation method has high cost and is difficult to popularize; the overheating of the melt and the heat treatment process cause losses in the melting of the casting. The method for adding the iron removing agent into the aluminum melt has simple experimental process, does not need high cost, and does not cause loss of castings.
The method for adding the iron-removing agent mainly comprises 2 methods.
One method is a modification treatment method, which is to add Mn, co, mo, cr, ti and Be elements into an aluminum melt, and convert the existing form of the Fe element into an alpha-AlFeSi phase which has less influence on the performance of the aluminum alloy by inhibiting the generation of the beta-AlFeSi phase, thereby reducing the harm of impurity iron and realizing the iron removal effect. As is known from prior art document 1, (particulate students on beta-FeSiAl 5 phase in Al-7-Si-0.3 Mg alloy with trace additions of Be, mn, cr, and Co [ J ]. Materials characterization,1994,33 (2): 99-112), murali et Al indicate that the Be, mn, cr and Co elements can change the needle or flake form of the beta-AlFeSi phase to an alpha-AlFeSi phase with less influence on the properties of the aluminum alloy to various degrees. Although this technique can suppress the formation of β -AlFeSi phase and reduce the harmful effect of iron impurity on the aluminum alloy, the iron element remains in the aluminum alloy, and therefore the harmful effect of Fe cannot be completely eliminated.
The other method is a flux method of adding an iron removing agent, and the purpose of removing iron is achieved by adding a flux into an aluminum melt, reacting with Fe in the alloy, and capturing slagging or generating precipitation. The flux method has short time consumption, convenient operation, no damage to castings, low cost and mass production. At present, the flux method is a method for introducing B element as an iron remover, and no report is provided for introducing other elements as the iron remover.
The basic principle of introducing B element for removing iron is that the B element and the iron element form Fe 2 And B, further forming slag by sinking in a precipitation mode, thereby reducing the content of Fe element. Such as prior document 2 (purifying effect and mechanism of boride on impurity iron in aluminum melt [ D)]Shanghai university of transportation, 2010) high builder's guard removes iron from commercial purity aluminum by mixed additions of sodium chloride, potassium chloride and borax, achieving iron contents decreasing from the initial 0.14wt.%, 0.66wt.%, and 1.08wt.% to 0.08wt.%, 0.45wt.%, and 0.84wt.%, with iron removal rates of 42.9%, 31.8%, and 22.2%, respectively. However, the introduction of B element for iron removal represented by this technique has the same technical problem as follows: under the condition of low iron content, the iron removal rate basically meets the requirement, but when the iron is removed from the aluminum alloy with high iron content, the iron removal rate is obviously reduced.
In order to improve the iron removal effect on the aluminum alloy, the current technology is to add an additive such as a refining agent and a fluxing agent in addition to a flux containing an element B. The principle is that the B element and impurity iron are fully reacted, so that the iron removal rate is improved. For example, in the existing document 3 (chinese patent CN104831103B, an aluminum alloy iron-removing flux and a preparation method [ P ]), an aluminum alloy iron-removing flux and a preparation method thereof are disclosed, and besides boron carbide, industrial sodium chloride, industrial potassium chloride, manganese tetraborate, manganese chloride and a refining agent are added, so that the technical effect of reducing the iron content in the aluminum alloy from 0.30wt.% to 0.17wt.% is achieved, and the iron-removing rate is 43.3%. Although the technology can fully react the B element with impurity iron to improve the iron removal rate, the mixed solvent used by the technology needs to be subjected to the processes of dehydration, heat preservation, drying, ball milling and the like, the preparation is complex, and the iron removal rate of the aluminum alloy with low iron content is only improved.
In addition, according to the present research, it is shown that B element reacts with impurity Fe to generate Fe 2 B is unstable at high temperature and is easily decomposed, so that the iron removal effect is reduced. Such as prior document 4 (research on removing technique of iron phase impurities in cast Al-Si alloy [ D ]]2019, zhejiang industrial university), pomstrc points out that Fe is generated when the heat is preserved for a long time above 780 ℃ 2 B is unstable and will be decomposed into Fe element again, so that the iron content in the melt is increased. Therefore, B-ary is introducedFe exists in the method for removing iron by elements 2 B is unstable and easy to decompose, and the iron content in the melt after decomposition is increased, so that the iron removal effect is reduced.
Obviously, the flux method using the B element cannot solve the above problems from the root, and as described above, no other element has been reported for the flux method in the current studies on the flux method. Based on the basic principle of the flux method, the new iron remover needs to meet the following technical characteristics: the iron removal element has stable iron removal effect, and the iron-containing compound is settled to the bottom of the melt and is not decomposed; the method is suitable for aluminum alloy with high iron content, namely, the aluminum alloy with the iron content higher than 1.0wt.% still has high iron removal rate; on the basis, the problem of complex preparation of the iron removing agent is solved, processes such as dehydration, ball milling and the like are not needed, and the iron removing agent is not needed to be mixed with various fluxing agents for use.
Disclosure of Invention
The invention aims to provide an Al-50Sn alloy-based method for removing iron from an aluminum melt, which still has high iron removal rate when a matrix aluminum alloy has high iron content, is simple to operate, has low viscosity of an iron removal flux and is pollution-free.
In order to achieve the above-mentioned object, the basic principle involved in the present invention is: by introducing new elements, the iron-containing compound can be generated by reaction with Fe in a temperature range of 700-800 ℃, and the generated phase density of the iron-containing compound is greater than that of aluminum liquid, so that the iron-containing compound is precipitated and enriched to the bottom of the melt, the iron content at the bottom of the melt is increased, the iron content at the upper part of the melt is reduced, and finally, the enriched bottom of the iron element is cut off, so that the iron removal effect of the aluminum alloy can be realized. In addition, the introduced elements should be sufficient to react only with the iron element and not react with other elements in the aluminum alloy to form phases, i.e., not to cause damage to the matrix.
In light of the above requirements, the applicant has found that Sn element reacts with Fe only in the temperature range of 700-800 ℃ to form Fe 3 Sn 2 、Fe 5 Sn 3 And the like, do not react with Al.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that:
an Al-50Sn alloy-based aluminum melt iron removal method is characterized in that Al-50Sn alloy is used as an iron removal agent, the aluminum melt is aluminum with high iron content, the iron removal method is a flux method, and the basic principle is that Sn phase is formed by introducing Sn element and attached to beta-Fe phase, so that Fe-rich phase is promoted to be precipitated, and the Fe-rich phase in the aluminum is mainly gathered at the bottom;
the content of Fe in the aluminum melt is 0.9-1.1wt.%;
the iron removal rate of the iron removal method is 31.0-43.0%.
An Al-50Sn alloy-based aluminum melt iron removal method comprises the following steps:
step 1, preparing raw materials, namely respectively weighing Al-50Sn alloy and aluminum alloy according to a certain proportion of the addition amount of the Al-50Sn alloy, preheating the Al-50Sn alloy to obtain preheated Al-50Sn alloy, and heating and melting the aluminum alloy to obtain an aluminum melt;
in the step 1, the addition amount of the Al-50Sn alloy is 1.0-3.0wt.%;
in the step 1, the Al-50Sn alloy is preheated under the condition that the Al-50Sn alloy is wrapped by an aluminum foil, and the preheating temperature is 150-200 ℃;
step 2, performing iron removal operation on the aluminum melt, namely adding preheated Al-50Sn alloy into the aluminum melt to perform iron removal operation under a certain condition, cooling the aluminum melt to room temperature in the air after the iron removal operation is finished to obtain the aluminum melt after the iron removal operation, and finally cutting the aluminum melt from a position 1/6 away from the bottom of the alloy in the embodiment 1 to finish the iron removal of the aluminum melt;
in the step 2, the iron removal operation conditions are that the iron removal temperature is 720-840 ℃ and the iron removal time is 30-90min.
The invention uses ICP detection means to prove that the Fe-rich phase is settled to the bottom of the melt by adding the Al-50Sn alloy, the iron removal effect is achieved, and the iron removal rate is 31.0-43.0%.
The invention uses OM detection means to prove that the addition of the Al-50Sn alloy enables the Fe-rich phase to settle to the bottom of the melt, thereby obtaining the iron removal effect.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, by introducing Sn element, the Sn phase only acts with the Fe-rich phase and attaches to the Fe-rich phase, so that the Fe-rich phase is promoted to be settled, and the technical effect of reducing the iron content at the top is achieved;
2. the invention introduces Sn element which is attached to the Fe-rich phase and is stable at high temperature without decomposition, and introduces Fe generated by B element 2 Substantial differences exist in B-phase pyrolysis, and a remarkable technical effect is obtained;
3. the iron removal method has stable and efficient iron removal effect on the aluminum melt with high Fe content;
4. the method has simple process, only needs Al-50Sn alloy, does not need dehydration, ball milling and other processes, and does not need to be mixed with various fluxing agents for use, so the method for removing the iron has convenient operation and meets the application requirement and the production requirement.
Drawings
FIG. 1 is a schematic height diagram of the selection of alloys in comparative example 1, example 2, example 3 and comparative example 2;
FIG. 2 is a graph showing the variation of the iron content of the alloys in comparative example 1, example 2, example 3 and comparative example 2 with the height;
FIG. 3 is a metallographic structure chart of the alloy of example 1, wherein 3a is a metallographic structure at 4.5cm, and 3b is a metallographic structure at 1.0 cm;
FIG. 4 is a metallographic structure diagram of a matrix alloy of comparative example 1 at a position of 4.5 cm;
FIG. 5 is the metallographic structure of the alloy of example 2, in which 5a is a metallographic phase at 4.5cm and 5b is a metallographic phase at 1.0 cm;
FIG. 6 is the metallographic structure of the alloy of example 3, where 6a is a metallographic phase at 4.5cm and 6b is a metallographic phase at 1.0 cm;
FIG. 7 is a metallographic structure of an alloy of comparative example 2, in which 7a is a metallographic structure at a position of 4.5cm and 7b is a metallographic structure at a position of 1.0 cm;
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, which are given by way of examples, but are not intended to limit the present invention.
Description 1: in order to evaluate the iron removal rate, aluminum alloys with Fe content of 1.0wt.%, referred to as Al-1Fe alloys for short, are uniformly used for the aluminum melts.
Description 2: since Sn element can form Fe with Fe element 3 Sn 2 And Fe 5 Sn 3 Therefore, in an ideal state, sn element completely reacts with Al-1Fe alloy, the iron remover is determined to be Al-50Sn, and the range of the addition amount is limited to 1.0-3.0wt.%.
Example 1
An aluminum melt iron removal method based on an Al-50Sn alloy comprises the following specific steps when the addition amount of the Al-50Sn alloy is 3 wt.%:
step 1, preparing raw materials, namely respectively weighing 23.4g of Al-50Sn alloy and 600g of Al-1Fe alloy with the addition of the Al-50Sn alloy being 3wt.%, wrapping the Al-50Sn alloy with aluminum foil, preheating at the preheating temperature of 150 ℃ to obtain preheated Al-50Sn alloy, and simultaneously heating and melting the Al-1Fe alloy to obtain Al-1Fe alloy melt;
and 2, performing iron removal operation on the aluminum melt, namely adding preheated Al-50Sn alloy into the Al-1Fe melt at the iron removal temperature of 780 ℃, performing iron removal operation under the condition that the iron removal time is 60min, cooling the aluminum alloy to room temperature in the air after the iron removal operation is finished, thus obtaining the aluminum alloy after the iron removal operation, namely the alloy of the embodiment 1, and finally cutting the aluminum alloy from the position 1/6 away from the bottom of the alloy of the embodiment 1, thus finishing the iron removal of the aluminum melt.
Description 3: all the aluminum alloys after iron removal operation obtained in the examples and the comparative examples of the present invention are cylinders with a height of 6.0cm and a diameter of 6.0cm, so that the aluminum alloy after iron removal operation in step 2 is cut from a position 1.0cm away from the bottom, and after cutting, the remaining 5/6 of the alloy in example 1 is the aluminum alloy after iron removal of 3wt.% of the Al-50Sn alloy.
Description 4: for the subsequent tests, the aluminum alloys obtained in all the examples of the present invention and the comparative examples after iron removal operation were sampled as follows. The specific sampling method is shown in fig. 1, and the aluminum alloy subjected to iron removal operation is cut at positions 1.0cm, 2.5cm and 4.5cm away from the bottom to obtain 3 sections, wherein the 3 sections are named as positions 1.0cm, 2.5cm and 4.5cm respectively.
In order to demonstrate the iron removal effect of the iron removal method of the present invention, ICP tests were performed at 1.0cm, 2.5cm and 4.5cm, respectively, of the alloy of example 1. The results of the tests are shown in table 1 and fig. 2, with example 1 alloy having an iron content of 1.19wt.% at 1.0cm, an iron content of 0.77wt.% at 2.5cm and an iron content of 0.56wt.% at 4.5 cm. Experimental results show that the iron content of the Al-1Fe alloy at the position of 4.5cm and the iron content of the Al-1Fe alloy at the position of 2.5cm are both reduced, while the iron content of the Al-1Fe alloy at the position of 1.0cm is increased, namely the effect that the Fe-rich phase is settled to the bottom of the alloy is realized by adding the Al-50Sn alloy, and the iron removal effect is obtained. In order to quantify the iron removal effect, the change in iron content was calculated. The iron content at the position of 4.5cm is reduced from 0.96wt.% to 0.56wt.%, and the iron removal rate can reach 41.7 percent by calculation.
TABLE 1 iron content at different heights for the alloys of the examples and the base alloy of the comparative example
To further demonstrate the iron removal effect of the iron removal method of the present invention, metallographic structure tests were carried out at 1.0cm and 4.5cm, respectively, of the alloy of example 1. The test results are shown in FIG. 3, in which FIG. 3a shows the metallographic structure of the alloy of example 1 at 4.5cm, with a small amount of Fe-rich phases; FIG. 3b shows the metallographic structure at 1.0cm of the alloy of example 1, showing a large number of Fe-rich phases and a large size. Experimental results show that the Fe-rich phase is settled, the Fe-rich phase at 4.5cm is less, the Fe-rich phase at 1.0cm is more, namely the Al-50Sn alloy is added with an iron removal effect, and the Fe-rich phase is settled to the bottom of the alloy. The metallographic structure experiment result and the ICP test result are combined, so that the effect that the Fe-rich phase is settled to the bottom of the alloy can be further realized by adding the Al-50Sn alloy, and the iron removal effect is obtained.
In order to demonstrate the iron removing effect of the iron removing method of the present invention, i.e., the technical effect of Al-50Sn alloy as an iron remover, comparative example 1, an iron removing method for an aluminum melt without adding Al-50Sn alloy, was provided.
Comparative example 1
A method of treating an aluminum melt without adding an Al-50Sn alloy, the steps not particularly described being the same as those in example 1 except that: the step 1 does not carry out weighing and preheating of the Al-50Sn alloy, and the step 2 does not add the Al-50Sn alloy, so that the Al-1Fe alloy without the Al-50Sn alloy, which is called matrix alloy for short, can be obtained.
To demonstrate the effect of the addition of Al-50Sn alloy on the iron removal effect, ICP tests were conducted at 1.0cm, 2.5cm and 4.5cm of the base alloy of comparative example 1. The test results are shown in table 1 and fig. 2, with an iron content of 1.03wt.% at 1.0cm, an iron content of 1.02wt.% at 2.5cm and an iron content of 0.96wt.% at 4.5 cm. The experimental result shows that the iron content in the matrix alloy has no obvious change along with the height change. As can be seen from the comparison of the test results with the alloy of example 1, the addition of the Al-50Sn alloy realizes the precipitation of the Fe-rich phase, i.e., the Al-50Sn alloy has the effects of precipitation and iron removal.
To demonstrate the effect of the addition of Al-50Sn alloy on the metallographic structure of the alloy, metallographic structure tests were carried out at 4.5cm of the base alloy of comparative example 1. As shown in FIG. 4, the Fe-rich phase at 4.5cm of the base alloy was large in number and large in size. The comparison of the test result with the alloy of example 1 shows that the addition of the Al-50Sn alloy realizes the sedimentation of the Fe-rich phase and obtains the iron removal effect.
To demonstrate the effect of Al-50Sn alloy addition on iron removal, example 2, an aluminum melt iron removal process with an Al-50Sn alloy addition of 2wt.%, was provided.
Example 2
An iron removal method for an aluminum melt in which an Al-50Sn alloy was added in an amount of 2wt.%, and the steps not specifically described were the same as in example 1, except that: the addition amount of the Al-50Sn alloy in the step 1 is 2wt.%, namely 15.6g of Al-50Sn alloy is weighed, and the aluminum alloy with the 2wt.% Al-50Sn alloy subjected to iron removal can be obtained.
In order to demonstrate the iron removal effect of the iron removal method of the present invention, ICP tests were performed at 1.0cm, 2.5cm and 4.5cm, respectively, of the alloy of example 2. The results of the tests are shown in table 1 and fig. 2, with example 2 alloy having an iron content of 1.15wt.% at 1.0cm, an iron content of 0.79wt.% at 2.5cm and an iron content of 0.61wt.% at 4.5 cm. In order to quantify the iron removal effect, the change in iron content was calculated. At 4.5cm, the iron content was reduced from 0.96wt.% to 0.61wt.%, and the iron removal rate was calculated to be 36.5%.
In order to further prove the iron removal effect of the iron removal method of the present invention, metallographic structure tests were carried out at 1.0cm and 4.5cm, respectively, of the alloy of example 2. The test results are shown in FIG. 5, in which FIG. 5a shows the metallographic structure of the alloy of example 2 at 4.5cm, with a small amount of Fe-rich phases; FIG. 5b shows the metallographic structure at 1.0cm of the alloy of example 2, showing a large number of Fe-rich phases and a large size.
To demonstrate the difference between the Sn element iron remover and the B element iron remover, example 2 and comparative example 2 were provided. In example 3, an Sn element iron remover, i.e., an Al-50Sn alloy, was added to the Al alloy; comparative example 2 is an Al-3B alloy with the addition of a B element iron remover to the Al alloy.
Example 3
An iron removal method for an aluminum melt in which an Al-50Sn alloy is added in an amount of 1wt.%, and the steps not specifically described are the same as those in example 1, except that: the addition amount of the Al-50Sn alloy in the step 1 is 1wt.%, namely 7.8g of the Al-50Sn alloy is weighed, and the aluminum alloy with the 1wt.% of the Al-50Sn alloy subjected to iron removal can be obtained.
In order to demonstrate the iron removal effect of the iron removal method of the present invention, ICP tests were performed at 1.0cm, 2.5cm and 4.5cm, respectively, of the alloy of example 3. The results of the tests are shown in table 1 and fig. 2, with example 3 alloy having an iron content of 1.12wt.% at 1.0cm, an iron content of 0.79wt.% at 2.5cm and an iron content of 0.66wt.% at 4.5 cm. In order to quantify the iron removal effect, the change in iron content was calculated. The iron content at 4.5cm was reduced from 0.96wt.% to 0.66wt.%, and the iron removal rate was calculated to be 31.3%.
To further demonstrate the iron removal effect of the iron removal method of the present invention, metallographic structure tests were carried out at 1.0cm and 4.5cm, respectively, of the alloy of example 3. The test results are shown in FIG. 6, in which FIG. 6a shows the metallographic structure of the alloy of example 3 at 4.5cm, with a small amount of Fe-rich phases; FIG. 6b is a metallographic structure of the alloy of example 3 at 1.0cm showing a large number of Fe-rich phases and a large size.
Comparative example 2
A method for removing iron from an aluminum melt based on an Al-3B alloy, wherein when the Al-3B alloy is added in an amount of 1wt.%, the steps not specifically described are the same as in example 1, except that: the adding amount of the Al-3B alloy in the step 1 is 1wt.%, namely 7.8g of the Al-3B alloy is weighed, and the aluminum alloy with the 1wt.% of the Al-3B alloy subjected to iron removal can be obtained.
To compare the iron removal effect of Al-3B, ICP measurements were performed at 1.0cm, 2.5cm and 4.5cm, respectively, for the comparative example 2 alloy. The results of the tests are shown in table 1 and fig. 2, with the comparative example 2 alloy having an iron content of 1.06wt.% at 1.0cm, an iron content of 0.86wt.% at 2.5cm and an iron content of 0.79wt.% at 4.5 cm. In order to quantify the iron removal effect, the change in iron content was calculated. The iron content at the position of 4.5cm is reduced from 0.96wt.% to 0.79wt.%, and the iron removal rate can reach 17.7% by calculation.
In order to compare the iron removal effect of Al-3B, metallographic structure tests were performed at 1.0cm and 4.5cm, respectively, for the alloy of comparative example 2. The test result is shown in FIG. 7, in which FIG. 7a shows that the metallographic structure of the alloy of comparative example 2 at 4.5cm has a small amount of Fe-rich phases, but the amount of Fe-rich phases is greater than that of the alloy of example 3 at the same position; FIG. 7b shows the metallographic structure of alloy 1.0cm in comparative example 2, showing a large number of Fe-rich phases.
As can be seen from the above example 3 and comparative example 2, the Al-50Sn alloy has better iron removal effect than the Al-3B alloy when the same amount of the Fe-rich phase is added, and the Al-50Sn alloy has more remarkable sedimentation effect of the Fe-rich phase due to iron removal.
The test results of the embodiment 1, the embodiment 2 and the embodiment 3 are combined to know that the addition of the Al-50Sn alloy realizes the sedimentation of the Fe-rich phase, namely, the Al-50Sn alloy has the sedimentation iron removal effect and has the iron removal effect on the aluminum melt.
Claims (7)
1. An Al-50Sn alloy-based aluminum melt iron removal method is characterized by comprising the following steps: al-50Sn alloy is used as a deironing agent, the aluminum melt is aluminum with high iron content, and the deironing method is a flux method, and the basic principle is that Sn phase is formed by introducing Sn element and attached to beta-Fe phase to promote the Fe-rich phase to be settled, so that the Fe-rich phase in the alloy is mainly gathered at the bottom.
2. The method for removing iron from the aluminum melt according to claim 1, wherein the method comprises the following steps: the content of Fe in the aluminum melt is 0.9-1.1wt.%.
3. The method for removing iron from the aluminum melt according to claim 1, wherein the method comprises the following steps: the iron removal rate of the iron removal method is 31.0-43.0%.
4. The method for removing iron from the aluminum melt according to claim 1, which is characterized by comprising the following steps:
step 1, preparing raw materials, namely respectively weighing Al-50Sn alloy and aluminum alloy according to a certain proportion of the addition amount of the Al-50Sn alloy, preheating the Al-50Sn alloy to obtain preheated Al-50Sn alloy, and heating and melting the aluminum alloy to obtain an aluminum melt;
and 2, performing iron removal operation on the aluminum melt, namely adding preheated Al-50Sn alloy into the aluminum melt to perform iron removal operation under a certain condition, cooling the aluminum melt to room temperature in the air after the iron removal operation is finished to obtain aluminum alloy subjected to the iron removal operation, and finally cutting the aluminum alloy in the position 1/6 away from the bottom of the alloy in the embodiment 1 to complete the iron removal of the aluminum melt.
5. The method for removing iron from the aluminum melt according to claim 4, wherein the method comprises the following steps: in the step 1, the addition amount of the Al-50Sn alloy is 1.0-3.0wt.%.
6. The method for removing iron from the aluminum melt according to claim 4, wherein the method comprises the following steps: in the step 1, the Al-50Sn alloy is preheated under the condition that the Al-50Sn alloy is wrapped by an aluminum foil, and the preheating temperature is 150-200 ℃.
7. The method for removing iron from the aluminum melt according to claim 4, wherein the method comprises the following steps: in the step 2, the iron removal operation conditions are that the iron removal temperature is 720-840 ℃ and the iron removal time is 30-90min.
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