CN111690865A - Device and method for improving absorption rate of blown granular nodulizer - Google Patents
Device and method for improving absorption rate of blown granular nodulizer Download PDFInfo
- Publication number
- CN111690865A CN111690865A CN202010454599.1A CN202010454599A CN111690865A CN 111690865 A CN111690865 A CN 111690865A CN 202010454599 A CN202010454599 A CN 202010454599A CN 111690865 A CN111690865 A CN 111690865A
- Authority
- CN
- China
- Prior art keywords
- reaction chamber
- secondary reaction
- spray gun
- spheroidizing
- nodulizer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000010521 absorption reaction Methods 0.000 title claims description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 64
- 238000010517 secondary reaction Methods 0.000 claims abstract description 56
- 239000007921 spray Substances 0.000 claims abstract description 44
- 238000006243 chemical reaction Methods 0.000 claims abstract description 41
- 229910052742 iron Inorganic materials 0.000 claims abstract description 32
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 29
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 29
- 239000011777 magnesium Substances 0.000 claims abstract description 29
- 239000002245 particle Substances 0.000 claims abstract description 20
- 239000011148 porous material Substances 0.000 claims abstract description 18
- 238000007664 blowing Methods 0.000 claims abstract description 11
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims 2
- 239000007924 injection Substances 0.000 claims 2
- 238000007086 side reaction Methods 0.000 abstract description 11
- 239000000779 smoke Substances 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract 1
- 239000000376 reactant Substances 0.000 description 10
- 238000005507 spraying Methods 0.000 description 5
- 239000011449 brick Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000012159 carrier gas Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
- C22C33/10—Making cast-iron alloys including procedures for adding magnesium
- C22C33/12—Making cast-iron alloys including procedures for adding magnesium by fluidised injection
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a device for improving the absorptivity of a blown granular nodulizer, which comprises: the device comprises a spheroidizing bag, a spray gun and a secondary reaction chamber arranged in the spheroidizing bag, wherein the secondary reaction chamber is a cavity with a concave inner part, and an opening of the secondary reaction chamber is opposite to a nozzle of the spray gun; the invention also provides a method for improving the absorptivity of the injected granular nodulizer, which comprises the following steps; s1, mounting the spray gun on the spheroidizing ladle cover, wherein the tail end of the spray gun is provided with a reaction chamber, and the upper end of the spray gun is connected with a conveying pipeline of the passivated magnesium particles; s2, arranging a side reaction chamber in the spheroidizing bag; s3, blowing the passivated magnesium particles which are not fully reacted in the spout reaction chamber to the secondary reaction chamber, continuing to react in the secondary reaction chamber, and sending the passivated magnesium particles to the balling ladle through a pore channel arranged in the secondary reaction chamber and a gap between the spout reaction chamber and the secondary reaction chamber. The invention can obviously improve the absorptivity of the nodulizer, reduce the molten iron splashing and smoke amount, and reduce the potential safety hazard and the environmental hazard.
Description
Technical Field
The invention relates to the technical field of blowing spheroidization processes, in particular to a device and a method for improving the absorption rate of a blowing granular spheroidizing agent.
Background
At present, the mainstream of the blowing and spheroidizing process is a magnesium-blowing spheroidizing process, which uses high-pressure inert gas (such as nitrogen) as a carrier, and passivated magnesium particles are added into molten iron through a pipeline and a special spray gun, and the passivated magnesium particles are vaporized after meeting high-temperature molten iron in a spray gun reaction chamber, and the magnesium reacts with oxygen, sulfur and the like in the molten iron to ensure that the molten iron is deoxidized and desulfurized and is continuously purified, so that the spheroidizing process is completed. Fig. 1 is a schematic diagram of a mainstream magnesium spraying spheroidizing process, and the invention is used for explaining the current mainstream process and the principle of the invention.
The current mainstream magnesium spraying spheroidization process shown in figure 1 comprises the following steps: firstly adding molten iron to be spheroidized into a spheroidizing ladle 2, then inserting a spray gun 3 into the molten iron 4 to be spheroidized, then blowing passivated magnesium particles 5 into the molten iron 4 to be spheroidized by utilizing high-pressure gas through the spray gun 3, wherein the passivated magnesium particles are contacted, mixed, vaporized and reacted with the molten iron in a reaction chamber 6, the un-vaporized passivated particle magnesium and magnesium steam which is not absorbed by the molten iron are further contacted, mixed, vaporized, reacted and floated with the molten iron in the molten iron 4, and finally the magnesium steam which is not absorbed by the molten iron and the un-vaporized passivated magnesium particles float out of the liquid level of the molten iron and are contacted and reacted with air to generate magnesium oxide.
The magnesium spraying spheroidizing process in the prior art has the following three problems: firstly, the magnesium absorption rate is low, so that the waste of metal magnesium is serious; secondly, the reaction is violent, the molten iron is splashed greatly, and potential safety hazards exist; thirdly, the smoke dust is large and easy to cause environmental pollution, and the main reason for causing the problems is that the design of the reaction chamber is unreasonable.
In view of the above problems, it is desirable to provide a novel spheroidization reaction device.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a device and a method for improving the absorption rate of a blown granular nodulizer.
In order to achieve the purpose, the invention adopts the following technical scheme:
an apparatus for increasing the absorption rate of a blown granular nodulizer, comprising: balling package, spray gun, set up the secondary reaction chamber in the balling package, the secondary reaction chamber be the cavity of inside sunken, the secondary reaction chamber opening with the spout of spray gun is relative.
Preferably, the secondary reaction chamber may be disposed in the interior of the spheroidizing bag in a protruding or recessed manner, preferably at the bottom of the spheroidizing bag.
Preferably, the spray gun is provided with a spray gun reaction chamber at the nozzle.
Preferably, the side wall of the reaction chamber of the spray gun is provided with a pore canal communicated with the balling ladle.
Preferably, the secondary reaction chamber and the spray gun nozzle are tightly connected or arranged in a clearance mode.
Preferably, the secondary reaction chamber is provided with a pore canal communicated with the balling ladle.
Preferably, the pore canal is arranged in a clockwise or anticlockwise rotating mode.
Preferably, the pore channels are distributed radially from the inside of the secondary reaction chamber to the spheroidizing bag.
The invention also provides a method for improving the absorptivity of the injected granular nodulizer, which is characterized by comprising the following steps:
s1: installing a spray gun on the spheroidizing ladle cover, wherein the tail end of the spray gun is provided with a nozzle reaction chamber, and the upper end of the spray gun is connected with a conveying pipeline of the passivated magnesium particles;
s2: injecting molten iron into the spheroidizing ladle, and transporting the spheroidizing ladle to the position below a spheroidizing ladle cover;
s3: starting a spray gun, and covering a spheroidizing ladle cover;
s4: communicating a conveying pipeline, and blowing the passivated magnesium particles to a nozzle reaction chamber;
s4: the passivated magnesium particles which are not fully reacted in the nozzle reaction chamber are blown to the secondary reaction chamber, continue to react in the secondary reaction chamber and are sent to the spheroidizing bag through a pore channel arranged in the secondary reaction chamber and a gap between the nozzle reaction chamber and the secondary reaction chamber.
The invention has the following beneficial effects:
1. the auxiliary reaction chamber is arranged at the position opposite to the spray gun, a pre-reaction space can be formed, the reactant and the molten iron are mixed in one step and are diffused to the spheroidizing bag through the auxiliary reaction chamber, and the reaction rate is improved;
2. the pore canal is arranged in the secondary reaction chamber, so that a more comprehensive diffusion way for the reactant in the secondary reaction chamber to the spheroidizing bag is provided, and meanwhile, the different arrangement modes of the pore canal increase the contact time of the reactant and molten iron and improve the spheroidizing reaction absorption rate;
3. the pore channels in the secondary reaction chamber can be radially arranged clockwise or anticlockwise, the spray gun can cause molten iron to rotate in the spheroidizing bag through the pore channels of the reaction chamber in the blowing process, the reactant can also rotate and rise to improve the contact space and time between the reactant and the molten iron, and the reactant absorption rate and the reaction rate of the spheroidizing reaction are greatly increased;
4. the reactant and the molten iron are firstly contacted in the secondary reaction chamber and pass through a gap between the spray gun and the secondary reaction chamber or a pore passage of the secondary reaction chamber, so that the intensity of direct contact of the spheroidizing bag with the reactant is reduced, and the safety coefficient is improved.
Drawings
FIG. 1 is a schematic diagram of a conventional mainstream magnesium-spraying spheroidizing process.
FIG. 2 is a schematic diagram of an embodiment of the present invention.
FIG. 3 is a schematic view of the basic type of the mutual position of the secondary reaction chamber and the lance.
FIG. 4 is a schematic view of a basic pattern of a side reaction chamber and a well
FIG. 1 illustrates:
1 spheroidizing ladle cover, 2 spheroidizing ladle, 3 spray gun, 4 molten iron, 5 passivated magnesium particles, 6 spray gun reaction chamber and 8 conveying pipeline
FIG. 2 illustrates:
1 spheroidizing ladle cover, 2 spheroidizing ladle, 3 spray gun, 4 molten iron, 5 passivated magnesium particles, 6 spray gun reaction chamber and 7 inner side reaction chamber
FIG. 3 illustrates:
1 spray gun, 2 side reaction chambers and 3 bottom-wrapped bricks
FIG. 3a is a schematic view of the lance inserted into the side reaction chamber, FIG. 3b is a schematic view of the lance on the side reaction chamber
FIG. 4 illustrates:
1 side reaction chamber, 2 side reaction chamber open pores, 3 package bottom brick, 4 spiral hole, 5 rotation hole
FIG. 4a is an arc hole, FIG. 4b is a curved or spiral hole, and FIG. 4c is an oblique hole
FIG. 4a is an integrated side reaction chamber, and FIGS. 4b and 4c are formed brick type side reaction chambers
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Example one
As shown in fig. 2, a secondary reaction chamber 7 is arranged at the inner bottom of the spheroidizing bag 2, the secondary reaction chamber 7 is of an inward concave revolving body structure with an upward opening, is opposite to the outlet of the spray gun reaction chamber 6 on the spray gun 3, and a gap is reserved between the secondary reaction chamber and the spray gun reaction chamber, so that molten iron and air flow can enter and exit a space surrounded by the spray gun reaction chamber and the secondary reaction chamber. The spray gun 3 is arranged on the spheroidizing ladle cover 1, the tail end of the spray gun 3 is provided with a reaction chamber 6, and the upper end of the spray gun is connected with a conveying pipeline 8 of the passivated magnesium particles.
Through holes or grooves (as shown in fig. 4) are arranged on the side wall of the secondary reaction chamber 7 and are distributed radially from inside to outside to form a channel for spraying a mixture of molten iron, magnesium vapor, carrier gas and passivated magnesium particles out of the secondary reaction chamber.
Example two
As shown in fig. 3b, the lance reaction chamber is disposed at the upper end of the secondary reaction chamber, the carrier gas and the magnesium particles firstly react with the molten iron in the lance reaction chamber through the lance, then flow out from the gap between the lance reaction chamber and the secondary reaction chamber or flow out into the spheroidizing bag through the pore channel after re-reacting through the secondary reaction chamber, and the contact degree between the reactant and the molten iron in the spheroidizing bag can be enlarged through different paths.
EXAMPLE III
As shown in fig. 4a and 4c, the side wall of the secondary reaction chamber can be provided with different shapes, and the pore canal is arranged on the side wall of the secondary reaction chamber, preferably on the bottom of the secondary reaction chamber, the arrangement of the pore canal is radial arrangement from the secondary reaction chamber to the spheroidizing bag, and the pore canal can be arranged in a way of rotating clockwise or counterclockwise.
Example four
As shown in fig. 4b, in order to increase the contact time of the reactant with the molten iron, the channel may be formed in a curved shape to increase the path length and improve the reaction efficiency.
EXAMPLE five
As shown in the figure (with the addition of figures), the openings of the pore channels can be arranged at the bottom of the secondary reaction chamber and upwards through the bottom of the spheroidizing bag.
In the drawings, the secondary reaction chamber 7 and the ladle bottom are integrated, but the secondary reaction chamber is not limited to the above, and the secondary reaction chamber can be embedded into the ladle bottom when being made into a prefabricated forming brick for use; and the side reaction chamber 7 and the hole groove on the side wall thereof may be various types.
The position of the secondary reaction chamber is not limited to the bottom of the ladle in the invention, but the bottom of the ladle is preferred, the bottom of the ladle can be arranged at different positions in the ladle according to the position of the nozzle, and the opening of the secondary reaction chamber corresponds to the outlet of the spray gun. In the patent "a spheroidizing process of molten iron by blowing granular nodulizer" (patent number: CN101768692A), it is stated that a nozzle (i.e. the outlet of the spray gun of the invention) can be arranged at different positions in a spheroidizing bag according to actual needs.
Compared with the original spheroidizing process of blowing the granular spheroidizing agent, the invention can obviously improve the absorptivity of the spheroidizing agent; by adding the secondary reaction chamber in the spheroidizing bag, the reaction space of the spheroidizing agent is increased, the retention time and the contact area of the spheroidizing agent in molten iron are prolonged, the absorptivity of the spheroidizing agent is improved, and the production cost is reduced; less molten iron splashing in the reaction process, stable spheroidization process and higher safety; the smoke generated by the reaction is less, and the method is more environment-friendly.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.
Claims (9)
1. An apparatus for increasing the absorption rate of a blown granular nodulizer, comprising: balling package, spray gun, set up the secondary reaction chamber in the balling package, the secondary reaction chamber be the cavity of inside sunken, the secondary reaction chamber opening with the spout of spray gun is relative.
2. The apparatus for increasing the absorptivity of a blown granular nodulizer according to claim 1, wherein said secondary reaction chamber is disposed in the interior of the nodulizing ladle, preferably at the bottom of the nodulizing ladle, in a protruding or recessed manner.
3. The device and the method for improving the absorptivity of the injected granular nodulizing agent according to claim 1, wherein the injection gun is provided with a spray gun reaction chamber at an injection port.
4. The apparatus of claim 1, wherein the sidewall of the reaction chamber of the lance is provided with a plurality of openings communicating with the spheroidizing bag.
5. The apparatus as claimed in claim 1, wherein the secondary reaction chamber is closely connected or spaced to the nozzle of the spray gun.
6. The apparatus of claim 1, wherein the secondary reaction chamber is provided with a plurality of openings communicating with the spheroidizing bag.
7. The apparatus according to claim 1, wherein the plurality of holes are radially distributed from the inside of the secondary reaction chamber to the spheroidization bag.
8. The device for increasing the absorptivity of a blown granular nodulizer according to claim 1, wherein the holes are arranged in a clockwise or counterclockwise rotation.
9. A method for improving the absorption rate of a blown granular nodulizer is characterized by comprising the following steps:
s1: installing a spray gun on the spheroidizing ladle cover, wherein the tail end of the spray gun is provided with a nozzle reaction chamber, and the upper end of the spray gun is connected with a conveying pipeline of the passivated magnesium particles;
s2: injecting molten iron into the spheroidizing ladle, and transporting the spheroidizing ladle to the position below a spheroidizing ladle cover;
s3: starting a spray gun, and covering a spheroidizing ladle cover;
s4: communicating a conveying pipeline, and blowing the passivated magnesium particles to a nozzle reaction chamber;
s4: the passivated magnesium particles which are not fully reacted in the nozzle reaction chamber are blown to the secondary reaction chamber, continue to react in the secondary reaction chamber and are sent to the spheroidizing bag through a pore channel arranged in the secondary reaction chamber and a gap between the nozzle reaction chamber and the secondary reaction chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010454599.1A CN111690865B (en) | 2020-05-26 | 2020-05-26 | Device and method for improving absorptivity of blown granular nodulizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010454599.1A CN111690865B (en) | 2020-05-26 | 2020-05-26 | Device and method for improving absorptivity of blown granular nodulizer |
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| Publication Number | Publication Date |
|---|---|
| CN111690865A true CN111690865A (en) | 2020-09-22 |
| CN111690865B CN111690865B (en) | 2024-02-06 |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112404372A (en) * | 2020-11-20 | 2021-02-26 | 山东国铭球墨铸管科技有限公司 | Speed-controlled rotational flow spheroidizing method for nodular cast iron in ladle |
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|---|---|---|---|---|
| US4034970A (en) * | 1976-01-28 | 1977-07-12 | General Motors Corporation | Method and device for nodularizing cast iron |
| US4391636A (en) * | 1981-12-16 | 1983-07-05 | Wintec Company | Method of and apparatus for the production of nodular (ductile) cast iron |
| US5413315A (en) * | 1993-04-14 | 1995-05-09 | Norsk Hydro A.S. | Injection equipment |
| JPH09125129A (en) * | 1995-10-31 | 1997-05-13 | Kawasaki Steel Corp | Ladle refining apparatus for molten metal and method thereof |
| CN200955063Y (en) * | 2006-10-19 | 2007-10-03 | 新兴铸管股份有限公司 | Spraying-blowing magnesium-grain molten-iron nodulizing equipment |
| CN203470886U (en) * | 2013-08-14 | 2014-03-12 | 肇庆精通机械有限公司 | Nodulizing bag |
| WO2014134762A1 (en) * | 2013-03-04 | 2014-09-12 | 天津市万路科技有限公司 | Nodularization method for nodular cast iron |
| CN107267711A (en) * | 2017-04-24 | 2017-10-20 | 鞍钢股份有限公司 | Molten steel alloying device and method of rotary blowing powder |
| CN207498406U (en) * | 2017-09-13 | 2018-06-15 | 新兴铸管股份有限公司 | A kind of nodularization packet |
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| CN110711858A (en) * | 2019-10-28 | 2020-01-21 | 任冲 | Iron-based master alloy powder balling device |
| CN213142149U (en) * | 2020-05-26 | 2021-05-07 | 新兴河北工程技术有限公司 | Device for improving absorption rate of blowing granular nodulizer |
-
2020
- 2020-05-26 CN CN202010454599.1A patent/CN111690865B/en active Active
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| US4034970A (en) * | 1976-01-28 | 1977-07-12 | General Motors Corporation | Method and device for nodularizing cast iron |
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|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112404372A (en) * | 2020-11-20 | 2021-02-26 | 山东国铭球墨铸管科技有限公司 | Speed-controlled rotational flow spheroidizing method for nodular cast iron in ladle |
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| Publication number | Publication date |
|---|---|
| CN111690865B (en) | 2024-02-06 |
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