CN112893830A - Liquid phase grading method for magnetic metal powder - Google Patents
Liquid phase grading method for magnetic metal powder Download PDFInfo
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- CN112893830A CN112893830A CN202011602579.0A CN202011602579A CN112893830A CN 112893830 A CN112893830 A CN 112893830A CN 202011602579 A CN202011602579 A CN 202011602579A CN 112893830 A CN112893830 A CN 112893830A
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- 239000000843 powder Substances 0.000 title claims abstract description 73
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 63
- 239000002184 metal Substances 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 52
- 239000007791 liquid phase Substances 0.000 title claims abstract description 40
- 239000006185 dispersion Substances 0.000 claims abstract description 56
- 239000012452 mother liquor Substances 0.000 claims abstract description 33
- 239000006148 magnetic separator Substances 0.000 claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 13
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 230000001804 emulsifying effect Effects 0.000 claims abstract description 5
- 238000005086 pumping Methods 0.000 claims abstract description 5
- 239000007787 solid Substances 0.000 claims abstract description 5
- 239000000243 solution Substances 0.000 claims description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 239000008367 deionised water Substances 0.000 claims description 9
- 229910021641 deionized water Inorganic materials 0.000 claims description 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 7
- 238000005194 fractionation Methods 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 3
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 claims description 3
- 239000007864 aqueous solution Substances 0.000 claims description 2
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 claims description 2
- GBMDVOWEEQVZKZ-UHFFFAOYSA-N methanol;hydrate Chemical compound O.OC GBMDVOWEEQVZKZ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical group CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 19
- 239000007788 liquid Substances 0.000 description 10
- 230000008569 process Effects 0.000 description 9
- 229910021645 metal ion Inorganic materials 0.000 description 4
- 239000012071 phase Substances 0.000 description 4
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 3
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 229910001424 calcium ion Inorganic materials 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000006260 foam Substances 0.000 description 3
- 229910001425 magnesium ion Inorganic materials 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 230000036632 reaction speed Effects 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/14—Treatment of metallic powder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/30—Combinations with other devices, not otherwise provided for
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- Soft Magnetic Materials (AREA)
Abstract
The invention discloses a liquid-phase grading method of magnetic metal powder, which relates to the technical field of powder liquid-phase grading, and adopts the technical scheme that a grading device consisting of a dispersion kettle, a filter, a batching vortex, a centrifugal pump, a hydrocyclone, a refrigerator and a magnetic separator is adopted to obtain the metal powder by a liquid-phase wet method; the method of the liquid phase wet method comprises the following steps: step 1, adding the grading solution into a dispersion kettle, and cooling to 2-4 ℃ through a refrigerator; step 2, adding metal powder into a dispersion kettle according to a proportion, mixing with the grading solution, and preparing into a dispersion solution with a solid content of 20%; step 3, emulsifying and dispersing the dispersion solution in a dispersion kettle to form dispersion mother liquor; step 4, introducing the dispersed mother liquor into a batching vortex through a filter, and pumping the dispersed mother liquor into a vortex separator for grading through a centrifugal pump; and 5, overflowing the dispersed mother liquor classified in the step 4 and collecting the dispersed mother liquor by a magnetic separator. The invention has the effect of remarkably improving the powder quality and the production efficiency.
Description
Technical Field
The application relates to the technical field of powder liquid-phase classification, in particular to a magnetic metal powder liquid-phase classification method.
Background
In known powder classification processes of metallic nickel, iron, and the like, gas phase classification and liquid phase classification are mainly used.
In gas phase fractionation plants, centrifugal cyclones are commonly used. The gas-phase grading is not beneficial to large-scale mass production due to small treatment capacity and low productivity, and meanwhile, the gas-phase grading powder is not thoroughly dispersed and is easy to generate agglomeration.
In the liquid phase fractionation method, alcohols are used more, and a common solvent is ethanol. However, ethanol is a volatile product, and during the grading process, a large amount of heat is generated by the ethanol under the high-speed mechanical motion of a centrifugal pump impeller, and a large amount of heat energy is also generated by the mutual collision of metal nickel powder particles, so that the temperature of the ethanol is increased, the evaporation of the ethanol is accelerated, and the consumption of the ethanol is high. Meanwhile, ethanol is an inflammable substance, the ethanol evaporation capacity is large after the temperature is increased in the classification process, the ethanol vapor concentration in the working environment is too high, the combustion and explosion are easy, and great potential safety hazards exist. And tap water is directly adopted to grade metal powder at normal temperature, so that the content of metal ions in common water is high, and the quality of the powder is influenced. The mechanical high-speed motion of the classification process, the mutual collision of particles produces a large amount of heat energy, makes the feed liquid temperature rise, produces a large amount of dross and foam, influences the operation. The temperature rise in the grading process accelerates the oxidation reaction of the metal powder and the dissolved oxygen in water, the surface of the metal powder is corroded and changed, and the performance of the metal powder is seriously influenced.
Meanwhile, in the liquid-phase classification method, the classified powder slurry is usually subjected to solid-liquid separation by a natural sedimentation method, however, since the powder particles are small and the sedimentation speed is slow, several hours or more are often required, the production efficiency is seriously affected, and improvement is needed.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a liquid-phase classification method for magnetic metal powder, so as to achieve the purpose of significantly improving the powder quality and production efficiency. The specific scheme is as follows:
a liquid phase grading method of magnetic metal powder is characterized in that metal powder is obtained by adopting a grading device consisting of a dispersion kettle, a filter, a batching vortex, a centrifugal pump, a hydrocyclone, a refrigerator and a magnetic separator in a liquid phase wet method; the method of the liquid phase wet method comprises the following steps:
step 2, adding metal powder into a dispersion kettle according to a proportion, mixing with the grading solution, and preparing into a dispersion solution with a solid content of 20%;
step 4, introducing the dispersed mother liquor into a batching vortex through a filter, and pumping the dispersed mother liquor into a vortex separator for grading through a centrifugal pump;
and 5, overflowing the dispersed mother liquor classified in the step 4 and collecting the dispersed mother liquor by a magnetic separator.
Preferably: in step 1, the fractionation solution is water or an organic aqueous solution.
Preferably: the grading solution is deionized water which is softened.
Preferably: the grading solution is methanol water solution or ethanol water solution.
Preferably: in step 2, the metal powder is magnetic nickel, iron and neodymium powder.
Preferably: in step 3, the pH of the dispersion solution is 6.5 to 7.
Preferably: in step 4, the temperature of the dispersion mother liquor during classification is 4-6 ℃.
Preferably: the stage pressure in the hydrocyclone is 0.8 Mpa.
Preferably: the dispersion kettle is connected with the filter, the filter is connected with the batching vortex, the batching vortex is connected with the centrifugal pump, the centrifugal pump is connected with the hydrocyclone separator, the hydrocyclone separator is connected with the collection tank, and the cooling pipeline of the refrigerator is connected with the dispersion kettle and the cooling jacket of the batching vortex so as to respectively control the temperature of the grading solution in the dispersion kettle and the temperature of the dispersion mother liquor in the batching vortex.
Preferably: the hydrocyclone separator is a magnetic rotary drum.
According to the scheme, the application provides the magnetic metal powder liquid-phase grading method, and the magnetic metal powder liquid-phase grading method has the following beneficial effects:
1. the powder is classified by adopting the low-temperature deionized water, so that the influence of metal ions such as calcium ions, magnesium ions and the like is avoided, and the effects of difficult combustion and safe process are achieved;
2. the metal powder feed liquid is finished at a low temperature, so that scum and foam in the feed liquid are reduced, and the operation is convenient;
3. the metal powder feed liquid is completed at a low temperature, so that the reaction speed of the metal powder and the dissolved oxygen in the deionized water is reduced, and the purity of the metal powder is improved while the oxidation of the metal powder is avoided;
4. the magnetic separator is adopted for solid-liquid separation, so that the effect of high collection efficiency is achieved;
5. the obtained metal powder has stable surface state and small change of specific surface area.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a magnetic metal powder liquid phase classification device disclosed in the present application.
Description of reference numerals: 1. a dispersion kettle; 2. a filter; 3. a burdening vortex; 4. a centrifugal pump; 5. a hydrocyclone separator; 6. a refrigerator; 7. and (4) a collection tank.
Detailed Description
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 only a part of the embodiments of the present application, and not all of the embodiments. 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.
The following is a detailed description of the liquid-phase classification method of magnetic metal powder according to the embodiment of the present invention:
as shown in figure 1, the magnetic metal powder liquid phase classification device comprises a dispersion kettle 1, a filter 2, a batching vortex 3, a centrifugal pump 4, a hydrocyclone 5, a refrigerator 6 and a magnetic separator.
Wherein:
the dispersion kettle 1 is used for mixing the grading solution and the metal powder; the filter 2 is used for preliminarily filtering the mixed grading solution and metal powder and guiding the filtered grading solution and metal powder into the burdening vortex 3; the hydrocyclone 5 is used for grading the dispersed solution so as to obtain corresponding metal powder under the action of the magnetic separator.
It should be mentioned that the hydrocyclone 5 is a magnetic drum; the dispersion tank 1 is connected with the filter 2, the filter 2 is connected with the batching vortex 3, the batching vortex 3 is connected with the centrifugal pump 4, the centrifugal pump 4 is connected with the hydrocyclone separator 5, and the hydrocyclone separator 5 is connected with the collection tank 7. Meanwhile, a cooling pipeline of the refrigerator 6 is connected with cooling jackets of the dispersion kettle 1 and the batching vortex 3 so as to respectively control the temperature of the grading solution in the dispersion kettle 1 and the temperature of the dispersing mother liquor in the batching vortex 3.
A liquid phase grading method of magnetic metal powder is characterized in that metal powder is obtained by adopting a grading device consisting of a dispersion kettle 1, a filter 2, a batching vortex 3, a centrifugal pump 4, a hydrocyclone 5, a refrigerator 6 and a magnetic separator through a liquid phase wet method.
Wherein:
the method of the liquid phase wet method comprises the following steps:
step 2, adding metal powder into the dispersion kettle 1 according to a proportion, mixing with the grading solution, and preparing into a dispersion solution with a solid content of 20%;
step 4, introducing the dispersed mother liquor into a batching vortex 3 through a filter 2, pumping the dispersed mother liquor into a vortex separator for classification through a centrifugal pump 4, and controlling the temperature of the dispersed mother liquor at the time of classification to be 4-6 ℃ through a refrigerating machine 6;
and 5, overflowing the dispersed mother liquor classified in the step 4 and collecting the dispersed mother liquor by a magnetic separator.
It is to be mentioned that the classification pressure in the hydrocyclone 5 is 0.8MPa and the pH of the dispersion solution is 6.5-7.
Example one
As shown in figure 1, the magnetic metal powder liquid phase classification device comprises a dispersion kettle 1, a filter 2, a batching vortex 3, a centrifugal pump 4, a hydrocyclone 5, a refrigerator 6 and a magnetic separator.
Wherein:
the dispersion kettle 1 is used for mixing the grading solution and the metal powder; the filter 2 is used for preliminarily filtering the mixed grading solution and metal powder and guiding the filtered grading solution and metal powder into the burdening vortex 3; the hydrocyclone 5 is used for grading the dispersed solution so as to obtain corresponding metal powder under the action of the magnetic separator.
It should be mentioned that the hydrocyclone 5 is a magnetic drum; the dispersion tank 1 is connected with the filter 2, the filter 2 is connected with the batching vortex 3, the batching vortex 3 is connected with the centrifugal pump 4, the centrifugal pump 4 is connected with the hydrocyclone separator 5, and the hydrocyclone separator 5 is connected with the collection tank 7. Meanwhile, a cooling pipeline of the refrigerator 6 is connected with cooling jackets of the dispersion kettle 1 and the batching vortex 3 so as to respectively control the temperature of the grading solution in the dispersion kettle 1 and the temperature of the dispersing mother liquor in the batching vortex 3.
A liquid phase grading method of magnetic metal powder is characterized in that metal powder is obtained by adopting a grading device consisting of a dispersion kettle 1, a filter 2, a batching vortex 3, a centrifugal pump 4, a hydrocyclone 5, a refrigerator 6 and a magnetic separator through a liquid phase wet method.
Wherein:
the method of the liquid phase wet method comprises the following steps:
step 2, adding nickel powder into the dispersion kettle 1 according to the proportion, mixing the nickel powder with deionized water, and preparing a dispersion solution with the solid content of 20%;
step 4, introducing the dispersed mother liquor into a batching vortex 3 through a filter 2, pumping the dispersed mother liquor into a vortex separator for classification through a centrifugal pump 4, and controlling the temperature of the dispersed mother liquor at the time of classification to be 4-6 ℃ through a refrigerating machine 6;
and 5, overflowing the dispersed mother liquor classified in the step 4 and collecting the dispersed mother liquor by a magnetic separator.
It is to be mentioned that the classification pressure in the hydrocyclone 5 is 0.8MPa and the pH of the dispersion solution is 6.5-7.
Example two
The difference between the second embodiment and the first embodiment is that the deionized water in the second embodiment is softened to remove metal ions such as calcium ions and magnesium ions.
EXAMPLE III
The difference between the third embodiment and the first embodiment is that the fractionation solution in the third embodiment is an aqueous methanol solution.
Example four
Example four differs from example one in that the fractionation solution in example four is an aqueous ethanol solution.
EXAMPLE five
The difference between the fifth embodiment and the first embodiment is that the metal powder in the fifth embodiment is iron powder.
EXAMPLE six
Example six differs from example one in that the metal powder in example six is neodymium powder.
In conclusion, the low-temperature deionized water is adopted for powder classification, so that the influence of metal ions such as calcium ions and magnesium ions is avoided, and the effects of difficult combustion and safe process are achieved; meanwhile, the metal powder feed liquid is finished at a low temperature, so that scum and foam in the feed liquid are reduced, and the operation is convenient; in order to further improve the purity of the metal powder, the reaction speed of the metal powder and the dissolved oxygen in the deionized water is reduced by finishing the metal powder feed liquid in a low-temperature state, so that the aim of effectively avoiding the oxidation of the metal powder is fulfilled; when the magnetic separator is used for solid-liquid separation, the effect of high collection efficiency is achieved; therefore, the metal powder obtained by the magnetic metal powder liquid-phase classification method of the present application has the effects of stable surface state and small change in specific surface area.
References in this application to "first," "second," "third," "fourth," etc., if any, are intended to distinguish between similar elements and not necessarily to describe a particular order or sequence. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein. Furthermore, the terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, or apparatus.
It should be noted that the descriptions in this application referring to "first", "second", etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.
The principle and the implementation of the present application are explained herein by applying specific examples, and the above description of the embodiments is only used to help understand the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. A liquid phase grading method of magnetic metal powder is characterized in that metal powder is obtained by a liquid phase wet method through a grading device consisting of a dispersion kettle (1), a filter (2), a burdening vortex (3), a centrifugal pump (4), a hydrocyclone (5), a refrigerator (6) and a magnetic separator; the method of the liquid phase wet method comprises the following steps:
step 1, adding the graded solution into a dispersion kettle (1), and cooling to 2-4 ℃ through a refrigerator (6);
step 2, adding metal powder into the dispersion kettle (1) according to a proportion, mixing with the grading solution, and preparing into a dispersion solution with a solid content of 20%;
step 3, emulsifying and dispersing the dispersion solution in a dispersion kettle (1) to form dispersion mother liquor;
step 4, introducing the dispersed mother liquor into a burdening vortex (3) through a filter (2), and pumping the dispersed mother liquor into a vortex separator for classification through a centrifugal pump (4);
and 5, overflowing the dispersed mother liquor classified in the step 4 and collecting the dispersed mother liquor by a magnetic separator.
2. The liquid-phase classification method of magnetic metal powder according to claim 1, characterized in that: in step 1, the fractionation solution is water or an organic aqueous solution.
3. The liquid-phase classification method of a magnetic metal powder according to claim 2, characterized in that: the grading solution is deionized water which is softened.
4. The liquid-phase classification method of a magnetic metal powder according to claim 2, characterized in that: the grading solution is methanol water solution or ethanol water solution.
5. The liquid-phase classification method of magnetic metal powder according to claim 1, characterized in that: in step 2, the metal powder is magnetic nickel, iron and neodymium powder.
6. The liquid-phase classification method of magnetic metal powder according to claim 1, characterized in that: in step 3, the pH of the dispersion solution is 6.5 to 7.
7. The liquid-phase classification method of magnetic metal powder according to claim 1, characterized in that: in step 4, the temperature of the dispersion mother liquor during classification is 4-6 ℃.
8. The liquid-phase classification method of magnetic metal powder according to claim 1, characterized in that: the grading pressure in the hydrocyclone (5) is 0.8 Mpa.
9. The liquid-phase classification method of magnetic metal powder according to claim 1, characterized in that: the dispersing kettle (1) is connected with the filter (2), the filter (2) is connected with the batching vortex (3), the batching vortex (3) is connected with the centrifugal pump (4), the centrifugal pump (4) is connected with the hydrocyclone separator (5), the hydrocyclone separator (5) is connected with the collection tank (7), and the cooling pipeline of the refrigerator (6) is connected with the dispersing kettle (1) and the cooling jacket of the batching vortex (3) so as to respectively control the temperature of the grading solution in the dispersing kettle (1) and the temperature of the dispersing mother liquor in the batching vortex (3).
10. The liquid-phase classification method of a magnetic metal powder according to claim 9, characterized in that: the hydrocyclone separator (5) is a magnetic rotary drum.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114377849A (en) * | 2022-01-11 | 2022-04-22 | 西安斯瑞先进铜合金科技有限公司 | Grading device and grading method for superfine metal chromium powder |
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2020
- 2020-12-29 CN CN202011602579.0A patent/CN112893830A/en active Pending
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| CN114377849A (en) * | 2022-01-11 | 2022-04-22 | 西安斯瑞先进铜合金科技有限公司 | Grading device and grading method for superfine metal chromium powder |
| CN114377849B (en) * | 2022-01-11 | 2024-03-29 | 西安斯瑞先进铜合金科技有限公司 | Grading device and grading method for superfine metal chromium powder |
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