CN112553473A - High purity aluminum purification method and apparatus - Google Patents
High purity aluminum purification method and apparatus Download PDFInfo
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- CN112553473A CN112553473A CN202011316884.3A CN202011316884A CN112553473A CN 112553473 A CN112553473 A CN 112553473A CN 202011316884 A CN202011316884 A CN 202011316884A CN 112553473 A CN112553473 A CN 112553473A
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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
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/02—Refining by liquating, filtering, centrifuging, distilling, or supersonic wave action including acoustic waves
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B21/00—Obtaining aluminium
- C22B21/06—Obtaining aluminium refining
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The application relates to the field of metal aluminum purification, in particular to a high-purity aluminum purification method and device. The purification method comprises the following steps: smelting an aluminum raw material; inserting a crystallization cooling pipe and a separation part into the molten aluminum after the smelting is finished; and the crystallization cooling pipe is rotated, the separation part rotates around the crystallization cooling pipe, and the rotation directions of the separation part and the crystallization cooling pipe are opposite. Inserting a crystallization cooling pipe and a separation part into molten aluminum after the smelting is finished; and the crystallization cooling pipe and the separation part rotate in opposite directions, so that the molten aluminum can be effectively prevented from rotating along with the crystallization cooling pipe, the relative rotation speed is accelerated, the molten aluminum rotates in the opposite direction, a concentrated layer can be thinned, the purification efficiency is improved, and the crystallization amount can be increased.
Description
Technical Field
The application relates to the field of metal aluminum purification, in particular to a high-purity aluminum purification method and device.
Background
Segregation is generally used to purify molten aluminum. This takes advantage of the following phenomena: the cooling tube is inserted into molten aluminum and rotated, and pure aluminum is precipitated as primary crystals and deposited on the cooling tube by locally cooling the melting temperature.
After the primary crystal aluminum is precipitated, other elements in the molten aluminum are concentrated as impurities outside the precipitation layer. This is called a concentrated layer, and the key to efficient purification by this segregation method is to thin the concentrated layer.
At present, in order to thin the densified layer outside the self-rotating deposition layer, it is a conventional practice to increase the number of revolutions.
However, the increase in the number of revolutions is limited, which results in a limited improvement in purification efficiency.
Disclosure of Invention
An object of the embodiments of the present application is to provide a high-purity aluminum purification method and apparatus, which aim to improve the problem of low purification efficiency of the existing aluminum metal.
In a first aspect, the present application provides a high purity aluminum purification process comprising the steps of:
smelting an aluminum raw material;
and inserting a crystallization cooling pipe into the molten aluminum after the smelting is finished, and rotating the crystallization cooling pipe. By inserting the crystallization cooling tube into the molten aluminum after the melting is completed and rotating the crystallization cooling tube, the purification efficiency can be improved, and the amount of crystallization can be increased.
In other embodiments of the present application, a crystallization cooling pipe and a separation member are inserted into molten aluminum after the end of melting,
making the separating component stationary or rotating around the crystallization cooling pipe;
when the separating component rotates around the crystallization cooling pipe, the rotating direction of the separating component is opposite to the rotating direction of the crystallization cooling pipe.
In other embodiments of the present application, wherein the separating member is spaced apart from the crystallization cooling tube.
In other embodiments of the present application, the separating member comprises a plurality of separating members disposed at intervals around the crystallization cooling tube.
In other embodiments of the present application, when the separating member rotates around the crystallization cooling tube, the rotation speed of the separating member and the crystallization cooling tube is in the range of 100-300 rpm.
In other embodiments of the present application, the relative linear velocity of the outer surface of the separating member is greater than the linear velocity of the surface of the devitrifying cooling tube.
In other embodiments of the present application, the shape of the separating member includes: plate-like or rod-like; the extension direction of the separating member in the molten aluminum is the same as the extension direction of the crystallization cooling tube in the molten aluminum.
In other embodiments of the present application, the devitrification cooling tubes and the separating member rotate coaxially as the separating member rotates around the devitrification cooling tubes.
In other embodiments of the present application, the devitrification cooling tubes are driven to rotate by the first driving source while the separating member rotates around the devitrification cooling tubes; the separating member is driven to rotate by a second drive source.
In other embodiments of the present application, a cooling gas is introduced into the devitrification cooling tube.
In other embodiments of the present application, the flow rate of the cooling gas is 100-800L/min.
In other embodiments of the present application, the aluminum source material is selected to have a purity of 3N8 and above.
In other examples of the present application, an aluminum raw material having a purity of 2N7 or more is selected as the aluminum raw material, and boron is added to the aluminum raw material to reduce the titanium content in the aluminum raw material.
In other embodiments of the present application, the temperature is controlled above the liquidus temperature and the upper limit is 720 ℃ when melting the aluminum raw material.
In a second aspect, the present application provides a high purity aluminum purification apparatus comprising:
a crucible;
the crystallization cooling pipe is inserted into the crucible and can rotate along a first direction; and
the separation component is inserted into the crucible and is arranged at intervals with the crystallization cooling pipe; the separating component can rotate around the crystallization cooling pipe along a second direction; the second direction is opposite to the first direction.
Adopt this high-purity aluminium purification device can improve purification efficiency effectively.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a high-purity aluminum purification apparatus provided in an embodiment of the present application.
Icon: 100-high purity aluminum purification apparatus; 110-a crucible; 120-crystallization cooling tube; 130-a separating member; 140-devitrification.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The embodiment of the application provides a high-purity aluminum purification method, which comprises the following steps:
and step S1, smelting the aluminum raw material.
Further, the aluminum material is selected to have a purity of 3N8 or more.
In other alternative embodiments, the aluminum raw material is selected to have a purity of 2N7 or higher, and boron is added to the aluminum raw material to reduce the titanium content of the aluminum raw material.
Further, when the aluminum raw material is melted, the temperature is controlled to be higher than the liquidus temperature and the upper limit value is 720 ℃.
Further, in some embodiments of the present application, the temperature at which the aluminum raw material is melted may be adjusted according to the content of impurities in the aluminum raw material.
Exemplarily, the following steps are carried out: when the content of impurities in the aluminum raw material is too high, the melting temperature can be appropriately increased.
And step S2, inserting a crystallization cooling pipe into the molten aluminum after the smelting is finished, and rotating the crystallization cooling pipe.
By inserting the crystallization cooling tube into the molten aluminum after the melting is completed and rotating the crystallization cooling tube, the purification efficiency can be improved, and the amount of crystallization can be increased.
Further, after the melting is finished, a crystallization cooling pipe and a separation member are inserted into the molten aluminum,
making the separating component stationary or rotating around the crystallization cooling pipe;
when the separating component rotates around the crystallization cooling pipe, the rotating direction of the separating component is opposite to the rotating direction of the crystallization cooling pipe.
Further, the separation part and the crystallization cooling pipe are arranged at intervals.
After the smelting is finished, a crystallization cooling pipe is inserted into the molten aluminum, the temperature of the molten aluminum around the crystallization cooling pipe is reduced, and local cooling melting temperature is generated, so that pure aluminum is precipitated in the form of primary crystals and is deposited on the cooling pipe. The molten aluminum around the cooling tube is precipitated around the cooling tube, which is called as devitrification. The plurality of devitrification forms a purification layer around the cooling tube. As the purification layer is formed, elements other than aluminum (not all elements) are discharged to the outer layer, and the outer layer has a higher concentration than the original concentration, and is therefore referred to as a concentrated layer.
The inventors have found that, when the rotation speed is increased to increase the relative speed with respect to the molten aluminum in order to thin the densified layer outside the precipitation layer by the self-rotation, the molten aluminum starts to move (rotate) together with the cooling pipe due to the influence of the fluidity of the molten aluminum, and the rotation speed is also limited to an upper limit. The synchronous rotation of the molten aluminum and the cooling pipe cannot achieve the effect of increasing the local fluidity, so that the thickening layer becomes thick, impurities cannot be discharged, the impurities are mixed into the crystallized substances to deteriorate the purification efficiency, and the crystallization process needs to be stopped, thereby reducing the productivity.
In the embodiment of the application, the crystallization cooling pipe and the separation component are inserted into molten aluminum after the smelting is finished; the crystallization cooling pipe is rotated, the separating component rotates around the crystallization cooling pipe, the rotating directions of the crystallization cooling pipe and the separating component are opposite, molten aluminum on the periphery of the crystallization cooling pipe can be effectively prevented from rotating along with the crystallization cooling pipe, and the rotating directions of the crystallization cooling pipe and the separating component are opposite, so that the relative rotating speed can be greatly accelerated, the molten aluminum rotates in the opposite direction, the thickening layer becomes thin, the purification efficiency is improved, and the obtained crystallization amount is increased. By this method, a raw material having a low purity can also be purified.
In some embodiments of the present application, a crystallization cooling tube and a separation member are inserted into molten aluminum after the melting is completed; and the crystallization cooling pipe is rotated to make the separating component still.
When the crystallization cooling pipe rotates and the separation part is static, the molten aluminum on the periphery of the crystallization cooling pipe can be reduced to rotate along with the crystallization cooling pipe, so that the thickening layer becomes thin, and the purification efficiency is improved.
Further, cooling gas is introduced into the crystallization cooling pipe.
Further, the flow rate of the cooling gas is 100-800L/min.
By making the flow rate of the cooling gas 100-800L/min, the local cooling melting temperature can be effectively realized, so that the pure aluminum is precipitated and deposited on the cooling pipe in the form of primary crystals.
Further optionally, cooling gas is introduced into the crystallization cooling tube, and the flow rate of the cooling gas is 150-.
Further optionally, cooling gas is introduced into the crystallization cooling tube, and the flow rate of the cooling gas is 200-700L/min.
Illustratively, cooling gas is introduced into the crystallization cooling pipe, and the flow rate of the cooling gas is 200L/min, 300L/min, 400L/min, 500L/min, 600L/min or 700L/min.
Further, the separating part comprises a plurality of separating parts which are arranged around the crystallization cooling pipe at intervals.
In the illustrated embodiment, the number of the above-described separating members is 2. The 2 separation parts are arranged around the crystallization cooling pipe at intervals.
Further, the shape of the separating member includes: plate-like or rod-like. The extension direction of the separating member in the molten aluminum is the same as the extension direction of the crystallization cooling tube in the molten aluminum.
In the illustrated embodiment, the separating member has a flat plate shape. The extension direction of the flat-plate-shaped separating member in the molten aluminum is consistent with the extension direction of the crystallization cooling pipe in the molten aluminum.
In other alternative embodiments of the present application, the above-mentioned separation portions may be provided in other numbers, for example, in 4 numbers.
In other alternative embodiments of the present application, the above-mentioned separated portions may uniformly surround the circumference of the devitrifying cooling tube.
In other alternative embodiments of the present application, the shape of the separating member may be a rod, for example, a plurality of rods are uniformly and intermittently arranged in the circumferential direction of the crystallization cooling tube.
Further, when the separating component rotates around the crystallization cooling pipe, the rotating speeds of the separating component and the crystallization cooling pipe are both within the range of 100-300 rpm.
Further optionally, when the separating part rotates around the crystallization cooling pipe, the rotating speeds of the separating part and the crystallization cooling pipe are both in the range of 150-250 rpm.
Further optionally, when the separating part rotates around the crystallization cooling pipe, the rotating speeds of the separating part and the crystallization cooling pipe are both in the range of 200-300 rpm.
In some embodiments of the present application, the outer surface of the separating member has a relative linear velocity greater than the linear velocity of the surface of the devitrifying cooling tube as the separating member rotates around the devitrifying cooling tube. Therefore, the speed of the reverse rotation of the molten aluminum is faster than the rotation speed of the crystallization cooling tube, and further, the concentrated layer can be quickly thinned, and the purification efficiency is improved. Illustratively, the number of revolutions of the devitrification cooling tube is 200 rpm; the number of revolutions of the separating member was 300 rpm.
In other embodiments of the present application, the number of revolutions of the devitrifying cooling tube is the same as the number of revolutions of the separating member as the separating member rotates around the devitrifying cooling tube. The molten aluminum can not synchronously rotate with the crystallization cooling pipe, and the concentrated layer can be quickly thinned, so that the purification efficiency is improved. Illustratively, the number of revolutions of the devitrification cooling tube is 300 rpm; the number of revolutions of the separating member was 300 rpm.
In other embodiments of the present application, the number of revolutions of the devitrifying cooling tube is greater than the number of revolutions of the separating member as the separating member rotates around the devitrifying cooling tube. The relative speed difference between the molten aluminum and the crystallization cooling pipe can also enable the concentrated layer to be quickly thinned, and the purification efficiency is improved. Illustratively, the number of revolutions of the devitrification cooling tube is 300 rpm; the number of revolutions of the separating member was 100 rpm.
Further, in some embodiments, the number of revolutions of the crystallization cooling tube and the separation member may be adjusted according to the content of impurities in the raw aluminum.
For example, when the content of impurities in the raw material aluminum is excessively high, the number of revolutions of the crystallization cooling tube and the separating member may be appropriately adjusted to a high value.
Further, the crystallization cooling tube and the separation member are coaxially rotated. The crystallization cooling pipe and the separation part rotate coaxially, and the rotation directions of the crystallization cooling pipe and the separation part are opposite. Illustratively, when the devitrification cooling tube rotates clockwise, the separation member rotates counterclockwise.
Further, the crystallization cooling pipe is driven to rotate by a first driving source;
the separating member is driven to rotate by a second drive source.
The crystallization cooling pipe is driven by a first driving source to rotate along a certain direction; the separating member is rotated in the opposite direction by the second driving source. Illustratively, the crystallization cooling tube is driven by a first driving source to rotate in a clockwise direction; the separating member is rotated in the counterclockwise direction by the second driving source.
The crystallization cooling pipe is arranged and driven to rotate by a first driving source; the separating member is driven to rotate by a second drive source. The crystallization cooling pipe and the separation part can be more conveniently controlled to rotate in opposite directions.
Referring to fig. 1, some embodiments of the present application provide a high purity aluminum purification apparatus 100 to which the high purity aluminum purification method provided in any of the foregoing embodiments is applied.
Further, the high purity aluminum purification apparatus 100 includes: a crucible 110, a crystallization cooling tube 120, and a separating member 130.
Further, the crystallization cooling tube 120 is adapted to be inserted into the crucible 110, and the crystallization cooling tube 120 is capable of rotating in a first direction.
Further, a separating member 130 is inserted into the crucible 110 and spaced apart from the crystallization cooling tube 120. The separating member 130 is capable of rotating around the crystallization cooling tube about the second direction. The second direction is opposite to the first direction.
Further, in some embodiments of the present application, the crucible 110 is a graphite crucible. The lower end of the graphite crucible is arc-shaped. The material of the graphite crucible is made of high-purity graphite material commonly used in the field.
Further, the separating member 130 and the crystallization cooling tube 120 may be driven to rotate by a driving source such as an electric motor, respectively. The electric motor can control the respective rotation numbers of the separating member 130 and the devitrification cooling tube 120. The separating member 130 and the crystallization cooling tube 120 rotate coaxially. The separating member 130 includes a plurality. A plurality of separating members 130 are spaced around the devitrifying cooling tubes 120. The shape of the plurality of separating members 130 includes: plate-like or rod-like.
In the illustrated embodiment, the devitrifying cooling tubes 120 rotate in a counterclockwise direction; the separating member 130 rotates around the crystallization cooling tube 120 in a clockwise direction, and the rotation directions are opposite to each other. The separating member 130 comprises two flat plates uniformly surrounding the crystallization cooling tube 120 by one turn.
Further, the cooling gas is introduced into the crystallization cooling tube 120, and the flow rate of the cooling gas is 100-. The cooling gas may be selected from cooling gases commonly used in the art, such as nitrogen, etc.
The crucible 110 is heated by a heat source, and thus, raw material aluminum is melted.
When the crucible is used, after the smelting is finished, the crystallization cooling tube 120 and the separation part 130 are inserted into the molten aluminum in the crucible 110, the crystallization object 140 is formed around the crystallization cooling tube 120, and the crystallization cooling tube 120 and the separation part 130 respectively rotate along opposite directions, so that the concentration layer is continuously thinned, and the purification efficiency is improved. The treatment time is set according to the impurity content in the raw material aluminum.
The features and properties of the present application are described in further detail below with reference to examples:
example 1
The high-purity aluminum purification method is provided according to the following steps:
high purity aluminum purification was performed using the high purity aluminum purification apparatus 100 shown in fig. 1. The aim is to achieve a final purified product with a purity of 5N or more. An aluminum raw material having a purity of 3N8 was placed in a graphite crucible 112, and the aluminum raw material was melted at a melting temperature of 700 ℃. When the raw material aluminum is melted into molten aluminum, the crystallization cooling tube 120 and the separation member 130 are inserted into the molten aluminum. Cooling gas is introduced into the crystallization cooling pipe 120, and the flow rate of the cooling gas is 100L/min. The driving source drives the crystallization cooling pipe 120 to rotate anticlockwise, the separation component 130 is driven to rotate clockwise around the crystallization cooling pipe 120, and the rotation speed of the crystallization cooling pipe 120 is 300 rpm; the separating member 130 rotates at 100 rpm. The purification time is 1 h.
Examples 2 to 5
A high purity aluminum purification process is provided, substantially the same as in example 1, except that: process parameters; see table 1 for details.
Comparative example 1
There is provided a high purity aluminum purification process, substantially the same as in example 1, except that: the separating member 130 is not provided.
Comparative example 2
There is provided a high purity aluminum purification process, substantially the same as in example 1, except that: the separating member 130 is stationary.
Comparative example 3
There is provided a high purity aluminum purification process, substantially the same as in example 1, except that: the separating member 130 rotates in the same direction as the crystallization cooling tube 120.
The products obtained by the high purity aluminum purification methods provided in examples 1 to 5 and comparative examples 1 to 3 were examined.
Experimental example 1
The purity and the crystallization amount of the purified product were analyzed by GDMS (glow discharge mass spectrometer) on the purified product obtained by the high purity aluminum purification methods provided in examples 1 to 5 and comparative examples 1 to 3. The purity of the products obtained in examples 1 to 5 and comparative examples 1 to 3 reached the same target value, 5N or more. The results are shown in Table 1.
TABLE 1
In table 1, the number of revolutions of the separator is negative, 0 is stationary, and positive, 0 is rotating in the same direction as the cooling pipe. The purification rate is improved even if the time required for the raw material to reach the target purity is shortened or the amount of the crystals to be crystallized in the same time is increased. The purification rate is {1- (a content of a certain impurity before crystallization-a content of a certain impurity after crystallization)/a content of a certain impurity before crystallization }. Different impurities differ in their respective properties, so that the purification rates of different impurities differ under the same purification conditions. Lower values of purification rate indicate higher purification efficiency.
As can be seen from the detection results in Table 1, the purification efficiency and the amount of crystallization are significantly improved by the methods of examples 1 to 5.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (15)
1. A method for purifying high purity aluminum, comprising the steps of:
smelting an aluminum raw material;
after the melting is finished, a crystallization cooling pipe is inserted into the molten aluminum, and the crystallization cooling pipe is rotated.
2. The method of purifying high purity aluminum according to claim 1,
after the smelting is finished, a crystallization cooling pipe and a separation part are inserted into the molten aluminum,
the separation part is made to be static or rotate around the crystallization cooling pipe;
when the separating component rotates around the crystallization cooling tube, the rotating direction of the separating component is opposite to the rotating direction of the crystallization cooling tube.
3. The method of purifying high purity aluminum according to claim 2,
wherein the separation member is arranged at an interval from the crystallization cooling pipe.
4. The method of purifying high purity aluminum according to claim 2,
the separation part comprises a plurality of separation parts which are arranged at intervals around the crystallization cooling pipe.
5. The method of purifying high purity aluminum according to claim 2,
when the separation part rotates around the crystallization cooling pipe, the rotation numbers of the separation part and the crystallization cooling pipe are both within the range of 100-300 rpm.
6. The method of purifying high purity aluminum according to claim 2,
the relative linear velocity of the outer surface of the separation part is greater than that of the surface of the crystallization cooling pipe.
7. The method of purifying high purity aluminum according to claim 2,
the shape of the separating member includes: plate-like or rod-like; the extension direction of the separation member in the molten aluminum is the same as the extension direction of the crystallization cooling pipe in the molten aluminum.
8. The method of purifying high purity aluminum according to claim 2,
the crystallization cooling tube and the separation member rotate coaxially as the separation member rotates around the crystallization cooling tube.
9. The method of purifying high purity aluminum according to claim 2,
when the separation part rotates around the crystallization cooling pipe, the crystallization cooling pipe is driven to rotate by a first driving source; the separating member is driven to rotate by a second driving source.
10. The method for purifying high-purity aluminum according to any one of claims 1 to 9, wherein a cooling gas is introduced into the crystallization cooling tube.
11. The method of purifying high purity aluminum according to claim 10,
the flow rate of the cooling gas is 100-800L/min.
12. The method of purifying high purity aluminum according to claim 1,
the aluminum raw material is selected from aluminum raw materials with the purity of 3N8 and above.
13. The method of purifying high purity aluminum according to claim 1,
the aluminum raw material is selected to have a purity of 2N7 or higher, and boron is added to the aluminum raw material to reduce the titanium content in the aluminum raw material.
14. The method of purifying high purity aluminum according to claim 1,
when the aluminum raw material is smelted, the temperature is controlled to be above the liquidus temperature, and the upper limit is 720 ℃.
15. A high purity aluminum purification apparatus, comprising:
a crucible;
a crystallization cooling tube for insertion into the crucible, the crystallization cooling tube being rotatable in a first direction; and
a separation member inserted into the crucible and spaced apart from the crystallization cooling tube; the separating part can rotate around the crystallization cooling pipe along a second direction; the second direction is opposite to the first direction.
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| CN110129586A (en) * | 2019-05-28 | 2019-08-16 | 宁波锦越新材料有限公司 | A kind of more swivels purifying partial crystallization device of ultra-pure aluminum |
| CN110172591A (en) * | 2019-05-28 | 2019-08-27 | 宁波锦越新材料有限公司 | A method of realizing that ultra-pure aluminum purifies partial crystallization using more swivels |
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