CN117886315A - Method for improving recovery rate and productivity of spherical graphite product - Google Patents
Method for improving recovery rate and productivity of spherical graphite product Download PDFInfo
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- CN117886315A CN117886315A CN202410068003.2A CN202410068003A CN117886315A CN 117886315 A CN117886315 A CN 117886315A CN 202410068003 A CN202410068003 A CN 202410068003A CN 117886315 A CN117886315 A CN 117886315A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 103
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 103
- 239000010439 graphite Substances 0.000 title claims abstract description 103
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000011084 recovery Methods 0.000 title claims abstract description 21
- 238000001514 detection method Methods 0.000 claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 claims abstract description 22
- 238000004806 packaging method and process Methods 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims description 38
- 239000000428 dust Substances 0.000 claims description 8
- 239000004744 fabric Substances 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/20—Graphite
- C01B32/205—Preparation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/02—Measures preceding sorting, e.g. arranging articles in a stream orientating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/34—Sorting according to other particular properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/36—Sorting apparatus characterised by the means used for distribution
- B07C5/361—Processing or control devices therefor, e.g. escort memory
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/36—Sorting apparatus characterised by the means used for distribution
- B07C5/361—Processing or control devices therefor, e.g. escort memory
- B07C5/362—Separating or distributor mechanisms
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/20—Graphite
- C01B32/21—After-treatment
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N15/0205—Investigating particle size or size distribution by optical means
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Inorganic Chemistry (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
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Abstract
A method for improving recovery rate and productivity of spherical graphite products belongs to the technical field of spherical graphite production. In order to improve the problems of low efficiency and low recovery rate in the production process of the spherical graphite, the invention conveys the flake graphite to an automatic bin of a DSC automatic production line, then conveys the flake graphite to a QWJ80 unit for first crushing treatment, and conveys the flake graphite obtained by the first crushing to a QWJ60 unit for second crushing treatment to obtain flake graphite obtained by the second crushing treatment; and conveying the flake graphite crushed for the second time into a QWJ50 machine set for spheroidizing, then carrying out DSC granularity on-line detection, detecting qualified spheroidized graphite, conveying the spheroidized graphite into a QWJ30 machine set for the second spheroidizing, then carrying out DSC granularity on-line detection, obtaining spherical graphite of a primary finished product, carrying out mixer mixing, conveying to a packaging machine for packaging, and obtaining the spherical graphite of the finished product.
Description
Technical Field
The invention belongs to the technical field of spherical graphite production, and particularly relates to a method for improving recovery rate and productivity of spherical graphite products.
Background
The natural spheroidized graphite for the lithium battery negative electrode material has high specific capacity, regular shape, good solubility with electrolyte after modification, and excellent electrochemical performance, and is widely applied.
The flake graphite is crushed by a QWJ80 model machine set and a QWJ60 model machine set in the process of processing spherical graphite, the crushed finished product enters the QWJ50 model machine set for shaping work, and the shaped finished product is sorted by the QWJ30 model machine set, so that the finished product is qualified. The high-speed rotation of the grinding disc in the grinder bin generates high temperature, the grinding block on the grinding disc and the fixed part gear ring are mutually rubbed and ground under the action of the high temperature, and the crystalline flake graphite is processed into spherical graphite, but operators need to sample and detect through each device in the production process to know the running state of the device, and then the device is adjusted, so that the problems of low efficiency, low recovery rate and low productivity exist in the production process.
Disclosure of Invention
The invention aims to solve the problems of low efficiency, low recovery rate and low productivity in the process of improving the production of spherical graphite, and provides a method for improving the recovery rate and the productivity of spherical graphite products.
In order to achieve the above purpose, the present invention is realized by the following technical scheme:
A method for improving recovery rate and productivity of spherical graphite products adopts DSC automatic production line to produce spheroidized graphite, comprising the following steps:
S1, conveying the flake graphite to an automatic bin of a DSC automatic production line, and then conveying the flake graphite to a QWJ80 unit for first crushing treatment to obtain first crushed flake graphite;
S2, conveying the primarily crushed crystalline flake graphite obtained in the step S1 into a QWJ60 unit for secondary crushing treatment, then carrying out DSC granularity online detection, wherein the detected qualified crystalline flake graphite is secondarily crushed, and returning unqualified crystalline flake graphite to the QWJ60 unit for secondary crushing treatment;
S3, conveying the flake graphite obtained in the step S2 and crushed for the second time into a QWJ50 unit for spheroidizing, then carrying out DSC granularity online detection, detecting qualified graphite for spheroidizing, conveying unqualified graphite to a cyclone separator for sorting two-port materials, then carrying out DSC granularity online detection, detecting qualified graphite for two-port materials, conveying unqualified graphite to a dust collection cloth bag for tail material sorting, carrying out DSC granularity online detection, detecting qualified graphite for tail material, conveying unqualified graphite to an automatic sorting machine for sorting, and returning the sorted flake graphite to the QWJ50 unit for spheroidizing;
S4, conveying the spheroidized graphite obtained in the step S3 into a QWJ30 unit for secondary spheroidization, then carrying out DSC granularity online detection, conveying the qualified spherical graphite to a cyclone separator for secondary material sorting, then carrying out DSC granularity online detection, conveying the unqualified spherical graphite to a dust-collecting cloth bag for tailing sorting, carrying out DSC granularity online detection, conveying the unqualified spherical graphite to an automatic sorting machine for sorting, and returning the sorted flake graphite to the QWJ50 unit for spheroidization;
S5, mixing the spherical graphite of the primary finished product obtained in the step S4 by a mixer, and then conveying the mixture to a packaging machine for packaging to obtain the spherical graphite of the finished product;
s6, collecting the two-port materials obtained in the step S3 and the step S4, and then conveying the two-port materials into a packaging machine for packaging to obtain a final two-port material;
S7, collecting the tailings obtained in the step S3 and the step S4, and then conveying the tailings to a packaging machine for packaging to obtain the final tailings.
Further, the DSC particle size online detection uses a Baite online laser particle size analyzer.
Further, the automatic sorting machine is a QWJ510 machine set.
Further, in step S2, an electric butterfly valve is disposed on an output pipeline of the QWJ60 unit.
Further, in the step S3, an electric butterfly valve is disposed on an output pipeline of the QWJ50 unit, an electric butterfly valve is disposed on an output pipeline of the two-port material, and an electric butterfly valve is disposed on an output pipeline of the tailing material.
Further, in the step S4, an electric butterfly valve is disposed on an output pipeline of the QWJ30 unit, an electric butterfly valve is disposed on an output pipeline of the two-port material, and an electric butterfly valve is disposed on an output pipeline of the tailing material.
Further, inputting product indexes corresponding to each equipment in the DSC automatic production line, detecting products according to a blanking port of each equipment by DSC granularity on-line detection, and automatically reworking the detected unqualified products through an unqualified pipeline until the product requirements are met, wherein the model of the DSC automatic production line is time-beneficial HS-2000.
The invention has the beneficial effects that:
The method for improving the recovery rate and the productivity of the spherical graphite product adopts a DCS automatic production line, has a real-time online detection function, does not need to be adjusted, eliminates unqualified materials, and improves the product percent of pass and the recovery rate.
Drawings
FIG. 1 is a schematic block diagram of a method for improving recovery and capacity of a spheroidal graphite product according to the present invention;
fig. 2 is a schematic block diagram of a prior art production process of a spheroidal graphite product.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and detailed description. It should be understood that the embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the embodiments described are merely some, but not all, of the embodiments of the invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein can be arranged and designed in a wide variety of different configurations, and the present invention can have other embodiments as well.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
For further understanding of the invention, the following detailed description is to be taken in conjunction with fig. 1 and 2, in which:
detailed description of the preferred embodiments
A method for improving recovery rate and productivity of spherical graphite products adopts DSC automatic production line to produce spheroidized graphite, comprising the following steps:
S1, conveying the flake graphite to an automatic bin of a DSC automatic production line, and then conveying the flake graphite to a QWJ80 unit for first crushing treatment to obtain first crushed flake graphite;
S2, conveying the primarily crushed crystalline flake graphite obtained in the step S1 into a QWJ60 unit for secondary crushing treatment, then carrying out DSC granularity online detection, wherein the detected qualified crystalline flake graphite is secondarily crushed, and returning unqualified crystalline flake graphite to the QWJ60 unit for secondary crushing treatment;
further, in the step S2, an electric butterfly valve is arranged on an output pipeline of the QWJ60 unit;
S3, conveying the flake graphite obtained in the step S2 and crushed for the second time into a QWJ50 unit for spheroidizing, then carrying out DSC granularity online detection, detecting qualified graphite for spheroidizing, conveying unqualified graphite to a cyclone separator for sorting two-port materials, then carrying out DSC granularity online detection, detecting qualified graphite for two-port materials, conveying unqualified graphite to a dust collection cloth bag for tail material sorting, carrying out DSC granularity online detection, detecting qualified graphite for tail material, conveying unqualified graphite to an automatic sorting machine for sorting, and returning the sorted flake graphite to the QWJ50 unit for spheroidizing;
Further, in the step S3, an electric butterfly valve is arranged on an output pipeline of the QWJ50 unit, an electric butterfly valve is arranged on an output pipeline of the two port materials, and an electric butterfly valve is arranged on an output pipeline of the tail materials;
S4, conveying the spheroidized graphite obtained in the step S3 into a QWJ30 unit for secondary spheroidization, then carrying out DSC granularity online detection, conveying the qualified spherical graphite to a cyclone separator for secondary material sorting, then carrying out DSC granularity online detection, conveying the unqualified spherical graphite to a dust-collecting cloth bag for tailing sorting, carrying out DSC granularity online detection, conveying the unqualified spherical graphite to an automatic sorting machine for sorting, and returning the sorted flake graphite to the QWJ50 unit for spheroidization;
Further, in the step S4, an electric butterfly valve is arranged on an output pipeline of the QWJ30 unit, an electric butterfly valve is arranged on an output pipeline of the two port materials, and an electric butterfly valve is arranged on an output pipeline of the tail materials;
S5, mixing the spherical graphite of the primary finished product obtained in the step S4 by a mixer, and then conveying the mixture to a packaging machine for packaging to obtain the spherical graphite of the finished product;
s6, collecting the two-port materials obtained in the step S3 and the step S4, and then conveying the two-port materials into a packaging machine for packaging to obtain a final two-port material;
S7, collecting the tailings obtained in the step S3 and the step S4, and then conveying the tailings to a packaging machine for packaging to obtain the final tailings.
Further, the DSC particle size online detection uses a Baite online laser particle size analyzer.
Further, the automatic sorting machine is a QWJ510 machine set.
Further, inputting product indexes corresponding to each equipment in the DSC automatic production line, detecting products according to a blanking port of each equipment by DSC granularity on-line detection, and automatically reworking the detected unqualified products through an unqualified pipeline until the product requirements are met, wherein the model of the DSC automatic production line is time-beneficial HS-2000.
Further, the QWJ80 machine set comprises 1 set of 80 machines, namely QWJ80 machines;
further, the QWJ60 machine set comprises 6 sets of 60 machines, namely QWJ60 machines;
further, the QWJ50 machine set comprises 9 sets of 50 machines, namely QWJ50 machines;
Further, the QWJ30 machine set comprises 4 sets of 30 machines, namely QWJ30 machines;
Further, the QWJ510 unit comprises 1 set of 510 machines, namely QWJ510 machines;
further, the equipment manufacturer is Qingdao middling powder equipment limited company;
model: the QWJ80 type ultrafine powder equipment is called QWJ80 machine for short, and is numbered QWJ801 and QWJ802;
model: the QWJ60 ultrafine powder equipment is called QWJ60 machine for short, and is numbered QWJ601 and QWJ602;
model: the QWJ50 ultrafine powder equipment is called QWJ50 machine for short, and is numbered QWJ501 and QWJ502;
model: the QWJ30 type ultrafine powder equipment is called QWJ30 machine for short, and is numbered QWJ301 and QWJ302;
The QWJ80 machine set comprises: 1. a main machine (comprising a main extension), a cyclone separator, a cloth bag type dust removing box and a Roots blower;
The QWJ60 unit comprises: 1. the main machine (comprising a main extension machine, an upper classifier, a cyclone separator, a cloth bag type dust removing box and a Roots blower;
The QWJ50 machine set comprises: 1. a main machine (comprising a main extension), a top classifier, a cyclone separator, a bag-type dust removing box and a Roots blower;
The QWJ30 machine set comprises: 1. the main machine (comprising a main extension) 2, an upper classifier 3, a cyclone separator 4, a bag-type dust removing box 5 and a Roots blower;
the QWJ510 unit comprises: 1. the main machine (comprising a main extension) 2, an upper classifier 3, a cyclone separator 4, a bag-type dust removing box 5 and a Roots blower;
The control mode is that the main machine, the main extension machine, the upper classifier and the Roots blower are controlled by frequency conversion of a frequency converter.
And (3) automatic control: by adopting HOLLIASMACS system of model HS-2000, the data control BBS frequency converter through the exchanger changes the running rotation speed of the equipment.
The specific parameters of the equipment of the method for improving the recovery rate and the productivity of the spherical graphite product according to the embodiment are shown in table 1:
table 1 device parameter table
The method for improving the recovery rate and the productivity of the spherical graphite product, which is described in the embodiment, corresponds to the production of 17-micrometer spherical graphite, and parameter indexes of DSC granularity online detection are shown in the table 2, and solves the problems of low productivity, low recovery rate, material waste and the like of SG 17-specification spherical graphite.
TABLE 2 on-line detection of parameter indicators
It is noted that relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Although the application has been described above with reference to specific embodiments, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the application. In particular, the features of the disclosed embodiments may be combined with each other in any manner so long as there is no structural conflict, and the exhaustive description of these combinations is not given in this specification solely for the sake of brevity and resource saving. Therefore, it is intended that the application not be limited to the particular embodiments disclosed herein, but that the application will include all embodiments falling within the scope of the appended claims.
Claims (7)
1. A method for improving recovery rate and productivity of spherical graphite products is characterized in that a DSC automatic production line is adopted for producing spheroidized graphite, and the method comprises the following steps:
S1, conveying the flake graphite to an automatic bin of a DSC automatic production line, and then conveying the flake graphite to a QWJ80 unit for first crushing treatment to obtain first crushed flake graphite;
S2, conveying the primarily crushed crystalline flake graphite obtained in the step S1 into a QWJ60 unit for secondary crushing treatment, then carrying out DSC granularity online detection, wherein the detected qualified crystalline flake graphite is secondarily crushed, and returning unqualified crystalline flake graphite to the QWJ60 unit for secondary crushing treatment;
S3, conveying the flake graphite obtained in the step S2 and crushed for the second time into a QWJ50 unit for spheroidizing, then carrying out DSC granularity online detection, detecting qualified graphite for spheroidizing, conveying unqualified graphite to a cyclone separator for sorting two-port materials, then carrying out DSC granularity online detection, detecting qualified graphite for two-port materials, conveying unqualified graphite to a dust collection cloth bag for tail material sorting, carrying out DSC granularity online detection, detecting qualified graphite for tail material, conveying unqualified graphite to an automatic sorting machine for sorting, and returning the sorted flake graphite to the QWJ50 unit for spheroidizing;
S4, conveying the spheroidized graphite obtained in the step S3 into a QWJ30 unit for secondary spheroidization, then carrying out DSC granularity online detection, conveying the qualified spherical graphite to a cyclone separator for secondary material sorting, then carrying out DSC granularity online detection, conveying the unqualified spherical graphite to a dust-collecting cloth bag for tailing sorting, carrying out DSC granularity online detection, conveying the unqualified spherical graphite to an automatic sorting machine for sorting, and returning the sorted flake graphite to the QWJ50 unit for spheroidization;
S5, mixing the spherical graphite of the primary finished product obtained in the step S4 by a mixer, and then conveying the mixture to a packaging machine for packaging to obtain the spherical graphite of the finished product;
s6, collecting the two-port materials obtained in the step S3 and the step S4, and then conveying the two-port materials into a packaging machine for packaging to obtain a final two-port material;
S7, collecting the tailings obtained in the step S3 and the step S4, and then conveying the tailings to a packaging machine for packaging to obtain the final tailings.
2. The method for improving the recovery rate and the productivity of the spherical graphite product according to claim 1, wherein the DSC particle size online detection uses a Baite online laser particle size analyzer.
3. The method of claim 1, wherein the automated sorter is a QWJ510 set.
4. A method for improving recovery and productivity of spheroidal graphite products according to claim 3, wherein an electric butterfly valve is disposed on the output line of the QWJ60 unit in step S2.
5. The method according to claim 4, wherein in the step S3, an electric butterfly valve is disposed on an output pipeline of the QWJ50 unit, an electric butterfly valve is disposed on an output pipeline of the two-port material, and an electric butterfly valve is disposed on an output pipeline of the tail material.
6. The method for improving the recovery rate and the productivity of the spherical graphite product according to claim 5, wherein in the step S4, an electric butterfly valve is arranged on an output pipeline of the QWJ30 unit, an electric butterfly valve is arranged on an output pipeline of the two-port material, and an electric butterfly valve is arranged on an output pipeline of the tail material.
7. The method for improving the recovery rate and the productivity of the spherical graphite product according to claim 6, wherein the product index corresponding to each equipment is input in the DSC automatic production line, the DSC granularity on-line detection detects the product according to the blanking port of each equipment, the detected unqualified product is automatically reworked through an unqualified pipeline until the product requirement is met, and the model of the DSC automatic production line is HS-2000 at the time of benefit.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118443891A (en) * | 2024-06-11 | 2024-08-06 | 中建材黑龙江石墨新材料有限公司 | A central control detection device and detection method for a spherical graphite production line |
| CN118847307A (en) * | 2024-06-05 | 2024-10-29 | 中建材黑龙江石墨新材料有限公司 | An automated natural spherical graphite production system and method |
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