CN110882657B - Spiral type silicon nitride powder dry-wet granulation intelligent device with concave-convex elliptic cylinder combined structure - Google Patents
Spiral type silicon nitride powder dry-wet granulation intelligent device with concave-convex elliptic cylinder combined structure Download PDFInfo
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- CN110882657B CN110882657B CN201911205929.7A CN201911205929A CN110882657B CN 110882657 B CN110882657 B CN 110882657B CN 201911205929 A CN201911205929 A CN 201911205929A CN 110882657 B CN110882657 B CN 110882657B
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/02—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops
- B01J2/04—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops in a gaseous medium
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/10—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic in stationary drums or troughs, provided with kneading or mixing appliances
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/58—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
- C04B35/584—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on silicon nitride
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/62695—Granulation or pelletising
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Abstract
The invention discloses an intelligent dry-wet granulation device for silicon nitride powder with a spiral concave-convex elliptic cylinder combined structure, which comprises a supporting system, a stirring system, a spraying system and an intelligent control system; the atomized liquid is uniformly sprayed out through the atomizing nozzle while the spiral concave-convex elliptic cylinder combined structure rotates positively at a high speed and the cylinder body of the separated elliptic granulation chamber rotates reversely, so that silicon nitride powder is agglomerated, and silicon nitride blank particles are directly formed. The invention combines the principle of ball milling-spraying with the principle of high-speed stirring granulation, effectively improves the granulation effect, the particle performance and the sphericity of the particles, does not need a drying process, avoids the generation of dust, saves energy consumption, reduces pollution and simultaneously enlarges the applicability.
Description
Technical Field
The invention relates to a powder granulation technology, in particular to a silicon nitride powder granulation device.
Background
The silicon nitride powder material has excellent performances of high thermal stability, strong oxidation resistance, high product size accuracy and the like; and can resist cold and hot impact, and can be heated to over 1000 ℃ in the air, and can not be cracked after being rapidly cooled and then rapidly heated. Because of its excellent properties, silicon nitride powder is commonly used for manufacturing mechanical components such as bearings, mechanical seal rings, turbine blades, permanent molds, etc. The silicon nitride powder granulating device is main equipment for converting superfine silicon nitride powder into silicon nitride particles by a granulating technology, and an excellent granulating structure and the equipment thereof have important influence on improving the mechanical property of the silicon nitride particles.
The silicon nitride wet granulation process of ball milling-spraying is widely applied to raw material preparation workshops in the ceramic industry, and the process is a typical 'three-high one-low' real photo with high energy consumption, high pollution, high investment and low output, and seriously restricts the development of the ceramic industry. The method has the advantages that the granulation process and the drying process of the powder are carried out simultaneously, and the method can be widely applied to powder granulation in various industries, such as pharmacy, food, chemical industry, mining industry, ceramic industry and the like. The disadvantages are lower particle strength and smaller particle size.
The silicon nitride dry granulation process can save the processes of ceramic raw material slurry ball milling and slurry spray granulation drying, directly grind the ceramic raw material into ultrafine powder, and realize the agglomeration of the powder into blank particles by the dry granulation powder-making process, thereby realizing the maximum reduction of energy consumption and cost saving. However, the ceramic blank particles prepared by the silicon nitride dry-process powder-making process have the problems of difficult control of particle size distribution, deviation of particle fluidity, small particle compression ratio, low green body strength, poor color mixing uniformity, low yield and the like, and are the fundamental reason which always restricts the popularization of the dry-process granulation powder-making process in raw material preparation workshops in the ceramic industry.
The existing dry granulation device inevitably causes dust generation, and is not suitable for the granulation of toxic or other dangerous powder. On the other hand, the existing wet granulation device needs to be dried after granulation, which wastes some solvents, and some drugs cannot be in direct contact with water, or are recrystallized to form other structures during drying, which is not suitable for wet granulation.
The existing granulation structure mainly depends on a cylindrical or conical stand column structure, the efficiency is low, and the prepared silicon nitride particles have poor sphericity and general qualification rate.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an intelligent dry-wet granulation device for silicon nitride powder with a spiral concave-convex elliptic cylinder combined structure.
The purpose of the invention is realized by the following technical scheme:
the invention provides an intelligent dry-wet granulation device for silicon nitride powder with a spiral concave-convex elliptic cylinder combined structure, which comprises a supporting system, a stirring system, a spraying system and an intelligent control system;
the supporting system comprises a bottom supporting frame and a supporting arm fixedly arranged on the bottom supporting frame;
the stirring system comprises a first motor, a stirring main shaft, a granulating chamber cylinder, a granulating chamber top cover, a V-shaped belt and a second motor; the barrel body of the granulating chamber and the top cover of the granulating chamber form a separated elliptic granulating chamber; the bottom of the barrel body of the granulating chamber is fixedly connected to the mounting base and is mounted on the bottom supporting frame through the clamping base; the second motor is connected with the driving mounting base and the granulating chamber cylinder body through a V-shaped belt wheel and a V-shaped belt to rotate; the stirring main shaft is arranged in the granulating chamber, and the lower part of the stirring main shaft is of a spiral concave-convex elliptic cylinder combined structure; the first motor is connected to the top end of the stirring main shaft and drives the stirring main shaft to rotate;
the spraying system comprises an atomizing nozzle, a conveying conduit, an atomized liquid solution chamber and an atomizing motor; the outlet of the atomized liquid solution chamber is connected to an atomizing nozzle through a conveying conduit, and the atomizing nozzle is arranged above the granulating chamber through the connection with the top cover of the granulating chamber; the atomization motor is connected with an outlet valve for controlling the atomized liquid solution chamber;
the intelligent control system comprises a cantilever beam arm, a connecting shaft, a slide rail clamping wall, a visual control panel, a slide rail, a lifting slide rail and a single chip microcomputer; the slide rail and the lifting slide rail are vertically arranged on the supporting arm through the slide rail clamping wall; a lifting slide rail motor connected with and driving the lifting slide rail is arranged in the slide rail clamping wall; the cantilever beam arm is horizontally arranged, and one end of the cantilever beam arm is connected to the top end of the lifting slide rail through a connecting shaft; a cantilever beam arm motor connected with and driving the cantilever beam arm to rotate is arranged in the connecting shaft; the first motor and the atomized liquid solution chamber are arranged on the cantilever beam arm; the visual control panel is arranged on the supporting arm; the single chip microcomputer is connected with and drives a first motor, a second motor, an atomizing motor, a lifting slide rail motor and a cantilever beam arm motor;
in the above scheme, the spiral concave-convex elliptic cylinder combined structure of the invention comprises spiral blades, concave elliptic cylinders and convex elliptic cylinders, wherein the concave elliptic cylinders are vertically arranged on the spiral blades at equal intervals, the convex elliptic cylinders are correspondingly arranged above the concave elliptic cylinders, and the axial directions of the concave elliptic cylinders and the convex elliptic cylinders are 90 degrees.
Furthermore, the bottom of the barrel body of the granulating chamber and the top cover of the granulating chamber are both semicircular.
Furthermore, the two atomizing nozzles and the two conveying pipes are provided, namely the right ultrasonic atomizing nozzle, the left ultrasonic atomizing nozzle, the right conveying pipe and the left conveying pipe are correspondingly arranged, the right ultrasonic atomizing nozzle and the horizontal line form an angle of 45 degrees, and the left ultrasonic atomizing nozzle and the right ultrasonic atomizing nozzle are symmetrically arranged.
The invention has the following beneficial effects:
(1) the invention combines the principle of ball milling-spraying with the principle of high-speed stirring granulation, and the atomization nozzle uniformly sprays atomized liquid while the spiral concave-convex elliptic cylinder combined structure rotates positively at high speed and the cylinder body of the separated elliptic granulation chamber rotates reversely, thereby directly forming silicon nitride blank particles. The invention does not need a drying process, avoids the generation of dust, saves energy consumption, reduces pollution and simultaneously enlarges applicability.
(2) Most granulating devices in the prior art adopt cylindrical or conical blades, and the collision between the blades and powder is mainly utilized to realize the agglomeration of the powder into granules. According to the invention, the spiral concave-convex elliptic cylinder combined structure is adopted, so that the silicon nitride powder can perform rolling snow ball motion to promote the silicon nitride powder to be agglomerated, the contact time of the powder and the spiral concave-convex elliptic cylinder combined structure is prolonged, and the granulation effect, the particle performance and the particle sphericity are effectively improved.
(3) The granulating chamber in the prior art is basically designed in a cylindrical shape, and powder is easy to accumulate at the corners of the bottom of the granulating chamber. The granulating chamber adopts a separable elliptical design, so that the phenomenon of powder accumulation at corners at the bottom of the granulating chamber is avoided, and the granulating efficiency is improved.
Drawings
The present invention will be described in further detail with reference to the following examples and the accompanying drawings.
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic diagram of a spiral concavo-convex elliptical pillar composite structure in the embodiment shown in FIG. 1 (a: front view; b: side view);
FIG. 3 is a functional block diagram of the intelligent control system of the embodiment shown in FIG. 1;
figure 4 is a schematic view of the rotation of the cantilever arm in the embodiment of figure 1.
In the figure: the device comprises a right hub 1, a bottom support frame 2, a V-shaped belt wheel 3, an installation base 4, a clamping seat chassis 5, a granulation chamber cylinder 6, a spiral concave-convex elliptic cylinder combined structure 7, a granulation chamber 8, a granulation chamber top cover 9, a right ultrasonic atomizing nozzle 10, a right ultrasonic atomizing nozzle conveying pipe 11, a stirring main shaft 12, a first motor 13, an atomized liquid solution chamber 14, a cantilever arm 15, a connecting shaft 16, a sliding rail clamping wall 17, a left ultrasonic atomizing nozzle conveying pipe 18, a left ultrasonic atomizing nozzle 19, a visual control panel 20, a sliding rail 21, a lifting sliding rail 22, a support arm 23, a V-shaped belt 24, a second motor 25, a left hub 26
Detailed Description
Fig. 1 to 4 show an embodiment of an intelligent device for dry-wet granulation of silicon nitride powder with a spiral concave-convex elliptic cylinder combined structure according to the present invention, which comprises a supporting system, a stirring system, a spraying system, and an intelligent control system.
As shown in fig. 1, the support system comprises a base support frame 2 and a support arm 23 fixedly arranged on the base support frame 2. Two right hubs 1 and two left hubs 26 are provided under the bottom bracket 2 to facilitate movement of the device.
As shown in fig. 1, the stirring system comprises a first motor 13, a stirring spindle 12, a granulation chamber cylinder 6, a granulation chamber top cover 9, a V-belt 24 and a second motor 25. The granulation chamber cylinder 6 and the granulation chamber top cover 9 form a separate elliptical granulation chamber 8, wherein the bottom of the granulation chamber cylinder 6 and the granulation chamber top cover 9 are both semicircular. The bottom of the granulating chamber cylinder 6 is fixedly connected on the mounting base 4 and is mounted on the bottom support frame 2 through the clamping base chassis 5. The second motor 25 is connected with the V-belt wheel 3 and the V-belt 24 to drive the mounting base 4 and the granulating chamber cylinder 6 to rotate. The stirring main shaft 12 is arranged in the granulating chamber 8, and the lower part of the stirring main shaft is a spiral concave-convex elliptic cylinder combined structure 7. The first motor 13 is connected to the tip of the stirring spindle 12 and drives the stirring spindle 12 to rotate.
As shown in fig. 2, the spiral concave-convex elliptic cylinder assembly 7 is composed of a spiral blade 7a, a concave elliptic cylinder 7b and a convex elliptic cylinder 7c, wherein the concave elliptic cylinders 7b are vertically arranged on the spiral blade 7a at equal intervals, the convex elliptic cylinders 7c are correspondingly arranged above the concave elliptic cylinders 7b, and the axial directions of the two are 90 °.
As shown in fig. 1, the spray system comprises a right ultrasonic atomizing nozzle 10, a left ultrasonic atomizing nozzle 19, a right delivery conduit 11, a left delivery conduit 18, and an atomized liquid solution chamber 14. The right ultrasonic atomizing nozzle 10 and the left ultrasonic atomizing nozzle 19 are respectively connected to the atomized liquid solution chamber 14 through a right conveying conduit 11 and a left conveying conduit 18, and are symmetrically arranged above the top cover of the granulating chamber 8 through a connection 9 with the top cover of the granulating chamber, and the right ultrasonic atomizing nozzle 10 and the left ultrasonic atomizing nozzle 19 are respectively 45 degrees and 135 degrees from the horizontal line. The atomized liquid solution consists of additive and water, the additive may include dibutyl phthalate, sodium alginate, polymethyl methacrylate, polyacrylamide and polyvinyl alcohol, and the content of the additive is not more than 3% of the total mass of the atomized liquid.
As shown in fig. 1, the intelligent control system includes a cantilever arm 15, a connecting shaft 16, a slide rail blocking wall 17, a visual control panel 20, a slide rail 21, a lifting slide rail 22, and a single chip microcomputer. The slide rail 21 and the lifting slide rail 22 are vertically arranged on the supporting arm 23 through the slide rail blocking wall 17. A lifting slide rail motor connected with and driving the lifting slide rail 22 is arranged in the slide rail blocking wall 17. The cantilever arm 15 is horizontally disposed, and one end thereof is connected to the top end of the lifting slide rail 22 through a connecting shaft 16. A cantilever arm motor connected to drive the cantilever arm 15 to rotate is provided in the connecting shaft 16. The first motor 13 and the atomized liquid solution chamber 14 are arranged on the cantilever arm 15. The visual control panel 20 is provided on the support arm 23. The singlechip is connected with and drives the first motor 13, the second motor 25, the atomizing nozzle, the lifting slide rail motor and the cantilever beam motor.
The single chip microcomputer of the present embodiment adopts a siemens PLC1200 single chip microcomputer, and as shown in fig. 3, the intelligent control system further includes a rotation speed sensor, a pressure sensor, a driver i, a driver ii, a driver iii, a driver iv, and a driver V. The rotation speed sensor is used for collecting rotation speed data of each motor and transmitting the data to the single chip microcomputer, and the single chip microcomputer controls each motor according to the data provided by the sensor. The driver I is used for receiving a control instruction of the single chip microcomputer and controlling the first motor 13 to rotate; the driver II receives the instruction of the single chip microcomputer and controls and drives the second motor 25 to rotate; the driver III receives an instruction transmitted by the singlechip and is used for controlling a cantilever arm motor to control the rotation angle of the cantilever arm 15; and the driver IV receives the instruction of the single chip microcomputer and is used for regulating and controlling the lifting height of the lifting slide rail 22 controlled by the lifting slide rail motor. When a starting signal of the first motor 13 is detected, the signal is sent to the driver V, and the driver V drives the atomizing motor to open an outlet valve of the atomized liquid solution chamber 14, so that the atomized liquid is sprayed out from the nozzle to form atomized liquid drops. The pressure sensor is used for detecting the pressure of the atomized liquid flowing into the atomizing nozzle, so that the flow of the atomized liquid can be controlled.
The working flow of the embodiment is as follows:
the operation is performed through the visual control panel 20, the key starting device is pressed, the lifting slide rail 22 is firstly lifted, and the cantilever beam arm 15 is driven to lift the spraying system, the first motor 13, the stirring main shaft 12 and the top cover 9 of the granulating chamber from the barrel body 6 of the granulating chamber. The cantilever motor is then activated to rotate the cantilever arm 15 counterclockwise (see fig. 4) away from the granulation chamber cylinder 6 to facilitate the addition of silicon nitride powder feedstock into the granulation chamber cylinder 6. After adding the silicon nitride powder, the cantilever arm motor is started again, the cantilever arm 15 rotates clockwise (see fig. 4) to the horizontal position, the lifting slide rail 22 descends, the top cover 9 of the granulating chamber and the barrel 6 of the granulating chamber are overlapped, and the initial position is returned. Then, starting the first motor 13 to drive the stirring main shaft 12 to rotate clockwise at a constant speed, and driving the barrel 6 of the granulating chamber to rotate anticlockwise at a constant speed by the second motor 25; then starting an atomizing motor to open an outlet valve of the atomized liquid solution chamber 14, so that the atomized liquid is sprayed out from the left atomizing nozzle 19 and the right atomizing nozzle 10 to form atomized liquid drops to be sprayed into the granulating chamber 8, and the spraying time is controlled.
In the granulation process, the silicon nitride powder is promoted to be agglomerated under the action of the spiral concave-convex elliptic cylinder combined structure 7. Wherein, the concave arc of the concave elliptic cylinder 7b can increase the contact time between the powder and the concave elliptic cylinder 7c, and is a main granulation structure for promoting the silicon nitride powder to be converted into silicon nitride particles; the protruding elliptic pillar 7c can play a role in stirring, and can also enable the powder to be in contact with the protruding elliptic pillar 7c by a long arc, so that the sphericity of the particles can be effectively improved. Therefore, the silicon nitride powder is in long-time contact with the spiral blade 7a in a snowball motion, and is changed into silicon nitride blank particles with the water content of 5-7% from silicon nitride powder under the combined action of the concave elliptic cylinder 7b and the convex elliptic cylinder 7 c.
Claims (2)
1. The utility model provides a spiral concave-protruding ellipse column integrated configuration silicon nitride powder is dry-wet system grain intelligent device which characterized in that: comprises a supporting system, a stirring system, a spraying system and an intelligent control system;
the supporting system comprises a bottom supporting frame (2) and a supporting arm (23) fixedly arranged on the bottom supporting frame (2);
the stirring system comprises a first motor (13), a stirring main shaft (12), a granulating chamber cylinder body (6), a granulating chamber top cover (9), a V-shaped belt (24) and a second motor (25); the bottom of the granulating chamber cylinder body (6) and the granulating chamber top cover (9) are both semicircular to form a separated elliptic granulating chamber (8); the bottom of the granulating chamber cylinder body (6) is fixedly connected to the mounting base (4) and is mounted on the bottom support frame (2) through the clamping base plate (5); the second motor (25) is connected with and drives the mounting base (4) and the granulating chamber cylinder (6) to rotate through the V-shaped belt wheel (3) and the V-shaped belt (24); the stirring main shaft (12) is arranged in the granulating chamber (8), the lower part of the stirring main shaft is a spiral concave-convex elliptic cylinder combined structure (7), the spiral concave-convex elliptic cylinder combined structure (7) consists of a spiral blade (7a), a concave elliptic cylinder (7b) and a convex elliptic cylinder (7c), the concave elliptic cylinders (7b) are vertically arranged on the spiral blade (7a) at intervals at equal intervals, the convex elliptic cylinder (7c) is correspondingly arranged above the concave elliptic cylinder (7b), and the axial directions of the concave elliptic cylinder and the convex elliptic cylinder are 90 degrees; the first motor (13) is connected to the top end of the stirring main shaft (12) and drives the stirring main shaft (12) to rotate;
the spraying system comprises an atomizing nozzle, a conveying conduit, an atomized liquid solution chamber (14) and an atomizing motor; the outlet of the atomized liquid solution chamber (14) is connected to an atomizing nozzle through a conveying conduit, and the atomizing nozzle is arranged above the granulating chamber (8) through the connection with the granulating chamber top cover (9); the atomization motor is connected with an outlet valve for controlling the atomized liquid solution chamber (14);
the intelligent control system comprises a cantilever arm (15), a connecting shaft (16), a sliding rail clamping wall (17), a visual control panel (20), a sliding rail (21), a lifting sliding rail (22) and a single chip microcomputer; the slide rail (21) and the lifting slide rail (22) are vertically arranged on the supporting arm (23) through the slide rail clamping wall (17); a lifting slide rail motor connected with and driving a lifting slide rail (22) is arranged in the slide rail clamping wall (17); the cantilever beam arm (15) is horizontally arranged, and one end of the cantilever beam arm is connected to the top end of the lifting slide rail (22) through a connecting shaft (16); a cantilever arm motor connected with and driving the cantilever arm (15) to rotate is arranged in the connecting shaft (16); the first motor (13) and the atomized liquid solution chamber (14) are arranged on the cantilever beam arm (15); the visual control panel (20) is arranged on the supporting arm (23); the single chip microcomputer is connected with and drives the first motor (13), the second motor (25), the atomizing motor, the lifting slide rail motor and the cantilever beam arm motor to be controlled.
2. The intelligent dry-wet granulation device for silicon nitride powder with spiral concave-convex elliptic cylindrical combined structure as claimed in claim 1, wherein: atomizing nozzle, conveying pipe are two, right ultrasonic atomization nozzle (10), left ultrasonic atomization nozzle (19) and right conveying pipe (11), left conveying pipe (18) that correspond promptly, right ultrasonic atomization nozzle (10) are 45 with the level line, left side ultrasonic atomization nozzle (19) and right ultrasonic atomization nozzle (10) symmetry setting.
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| CN112081576B (en) * | 2020-09-14 | 2022-04-19 | 西南石油大学 | Visual continuous pressurization reaction unit based on plc control |
| CN114087153A (en) * | 2021-11-10 | 2022-02-25 | 景德镇陶瓷大学 | Frog-woodpecker combined silicon nitride double-cylinder bionic compressor |
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| JP3599703B2 (en) * | 2001-12-27 | 2004-12-08 | タナベウィルテック株式会社 | Powder dryer |
| CN203874749U (en) * | 2014-04-08 | 2014-10-15 | 四川维尔康动物药业有限公司 | Fluidized drying granulator |
| CN104001450B (en) * | 2014-06-13 | 2015-12-16 | 刘春� | Revolving-drum granulator |
| CN203899566U (en) * | 2014-06-13 | 2014-10-29 | 刘春� | Rotary drum type granulator |
| CN105536644A (en) * | 2016-02-20 | 2016-05-04 | 山东义科节能科技有限公司 | Continuous prilling machine applied to ceramic powder and prilling technology thereof |
| CN205379863U (en) * | 2016-02-20 | 2016-07-13 | 山东义科节能科技有限公司 | Be applied to ceramic powder's continuous type granulator |
| CN106756026B (en) * | 2016-12-22 | 2018-10-09 | 钢铁研究总院 | A kind of mechanical stirring device producing manganeisen |
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