CN218393670U - Acid adjusting device for continuously adjusting pH value in cyanamide production - Google Patents
Acid adjusting device for continuously adjusting pH value in cyanamide production Download PDFInfo
- Publication number
- CN218393670U CN218393670U CN202222207172.9U CN202222207172U CN218393670U CN 218393670 U CN218393670 U CN 218393670U CN 202222207172 U CN202222207172 U CN 202222207172U CN 218393670 U CN218393670 U CN 218393670U
- Authority
- CN
- China
- Prior art keywords
- acid
- inlet
- kettle
- cyanamide
- adjusting
- 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.)
- Active
Links
Images
Landscapes
- Fertilizers (AREA)
Abstract
The utility model discloses an acid adjusting device for continuously adjusting pH value in cyanamide production, which comprises a first acid adjusting kettle and a second acid adjusting kettle, wherein the top of the first acid adjusting kettle is provided with a first motor, a first feed inlet and a first acid inlet; the top of the second acid adjusting kettle is provided with a second motor and a second acid inlet, the second motor is connected with a second stirring paddle positioned in the second acid adjusting kettle through a second stirring shaft, the upper part of the second acid adjusting kettle is provided with a second feed inlet, and the lower part of the second acid adjusting kettle is provided with a second discharge outlet; the first discharge port is connected with the second feed port through a material pipeline. The utility model discloses utilize two to transfer sour cauldron, adopt the mode of continuous feed accent sour, needn't frequently feed, advance sour, the ejection of compact, the resource cost of using manpower sparingly has improved production efficiency.
Description
Technical Field
The utility model relates to a single cyanamide production technical field, concretely relates to sour device of accent of continuous adjustment pH value in single cyanamide production.
Background
Cyanamide, also known as cyanamide, is an important intermediate in dicyandiamide production. Cyanamide has high solubility in water and weak acidity, and is completely dissolved with water at 43 ℃. Because it has high-activity cyano group and amino group, it has the advantages of dicyandiamide and polycyanamide, which are not possessed by resin processing, pesticide, medicine and chemical intermediate preparation. The cyanamide aqueous solution also has special effects of stopping dormancy, accelerating germination, promoting flower growth, killing insects, sterilizing and the like, and has low residue and easy degradation. The cyanamide contains cyano and amino groups, can perform addition reaction and substitution with a series of compounds, and is an extremely active compound. Because of its active reaction property, cyanamide is very harsh on storage conditions, otherwise it is not only easy to undergo addition reaction with cyano groups and substitution reaction with amine groups, but also easy to undergo hydrolysis and polymerization reactions.
At present, the cyanamide industry in China is mature, and the annual output is about 8 million tons. The cyanamide can be produced by the processes of lime nitrogen method, urea method, hydrocyanic acid method, urea-to-cyanamide method and ammonia method. The lime nitrogen method is mature in process, relatively environment-friendly and is the mainstream industrial preparation process at present. The process for producing cyanamide by lime nitrogen method mainly uses lime nitrogen (CaCN) 2 ) Hydrolyzing lime nitrogen in a reaction kettle as a raw material, introducing carbon dioxide for decalcification, adjusting acid, and filtering to obtain a cyanamide solution.
In the acid regulating step in the existing cyanamide production process, intermittent acid regulation is mostly adopted, after feeding and acid feeding, the cyanamide liquid and the acid liquid are uniformly stirred and then can be discharged, otherwise, the cyanamide liquid and the acid liquid are not uniformly mixed when the feeding and the discharging are carried out simultaneously, and the acid regulating effect is not ideal; the current intermittent acid regulation needs the operation of feeding, acid feeding and discharging repeatedly by operators, and has the disadvantages of low production efficiency, time and labor waste and high labor cost.
SUMMERY OF THE UTILITY MODEL
To the above prior art, the utility model aims at providing an adjust sour device of pH value in the production of cyanamide in succession. The device adopts the mode of continuous feeding and adjusting the acid, and the pH value of feed liquid is more stable, practices thrift manpower resources cost.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides an acid adjusting device for continuously adjusting pH value in cyanamide production, which comprises a first acid adjusting kettle and a second acid adjusting kettle, wherein the top of the first acid adjusting kettle is provided with a first motor, a first feed inlet and a first acid inlet; the top of the second acid adjusting kettle is provided with a second motor and a second acid inlet, the second motor is connected with a second stirring paddle positioned in the second acid adjusting kettle through a second stirring shaft, the upper part of the second acid adjusting kettle is provided with a second feed inlet, and the lower part of the second acid adjusting kettle is provided with a second discharge outlet; the first discharge port is connected with the second feed port through a material pipeline.
The cyanamide liquid enters the first acid adjusting kettle from the first feeding hole, the acid liquid is pumped into the first acid inlet by the first acid inlet pump, the acid liquid enters from the first acid inlet and flows out from the small hole at the bottom of the first acid spraying pipe, so that the contact area between the acid liquid and the cyanamide liquid is larger, the first motor is started, and the first stirring paddle is driven by the first stirring shaft to mix the cyanamide liquid, so that the cyanamide liquid is uniformly stirred. Along with single cyanamide liquid and acidizing fluid advance more, single cyanamide liquid after the mixture overflows from first discharge gate and gets into the second through the second feed inlet and transfer sour cauldron, and the second motor starts, drives second stirring rake through the second (mixing) shaft and mixes single cyanamide liquid, and extension reaction time later is followed the discharge of second discharge gate. Because the more the cyanamide liquid and the acid liquor in the first acid regulating kettle advance, the more the cyanamide liquid and the acid liquor can overflow from the first discharge port to the second acid regulating kettle, the reaction time is insufficient, the mixing is not uniform, the stirring and mixing are continuously carried out in the second acid regulating kettle, the reaction time is prolonged, and the full reaction is ensured.
Preferably, a first acid spraying pipe is arranged in the first acid adjusting kettle in the horizontal direction, one end of the first acid spraying pipe is connected with a first acid inlet through a vertical acid inlet pipeline, and the bottom of the first acid spraying pipe is provided with a plurality of small holes; and a second acid spraying pipe is arranged in the second acid adjusting kettle in the horizontal direction, one end of the second acid spraying pipe is connected with a second acid inlet through a vertical acid inlet pipeline, and a plurality of small holes are formed in the bottom of the second acid spraying pipe. The acid liquor enters from the first acid inlet, enters the first acid spraying pipe through the acid inlet pipeline, and is uniformly sprayed out from the small holes in the bottom, so that the contact area between the acid liquor and the cyanamide solution is larger, and the cyanamide solution is more uniformly stirred. When acid needs to be supplemented and adjusted, the second acid spraying pump is started, acid liquor enters from the second acid inlet and enters the second acid spraying pipe through the acid inlet pipe, and the acid liquor is uniformly sprayed from the small holes in the bottom of the second acid spraying pipe, so that the acid liquor and the cyanamide liquid are uniformly mixed, and the purpose of supplementing and adjusting acid is achieved.
Preferably, the first acid inlet is connected with a first acid inlet pump, and the second acid inlet is connected with a second acid inlet pump.
Preferably, the first discharge port is provided with a first pH meter, and the second discharge port is provided with a second pH meter. When the value of the first pH meter is higher than the control value, the acidity is low and does not reach the expected value, the acid liquid is pumped into the second acid adjusting kettle by the second acid inlet pump, enters from the second acid inlet, passes through the acid inlet pipeline firstly and then enters into the second acid spraying pipe, and is uniformly sprayed from the small holes at the bottom to supplement and adjust the acid, so that the pH value reaches the control value, and the product quality is stabilized. And the second pH meter detects the pH value of the cyanamide solution when the second acid adjusting kettle discharges the materials.
Preferably, the second discharge port is connected with a U-shaped pipeline. The U-shaped pipeline ensures that the cyanamide liquid can not be discharged as soon as entering the second acid regulating kettle, and ensures the reaction time of the cyanamide liquid and the acid liquid.
Preferably, the first feeding hole, the first discharging hole, the second feeding hole, the second discharging hole, the first acid inlet and the second acid inlet are all provided with valves.
The utility model has the advantages that:
the utility model utilizes two acid adjusting kettles, adopts a continuous feeding and acid adjusting mode, does not need to frequently feed, feed and discharge, saves the cost of manpower resources, improves the production efficiency and realizes the continuous adjustment of the pH value; the second acid adjusting kettle has the functions of prolonging the reaction time and supplementing and adjusting acid, so that the reaction is more fully carried out, and the supplementing and adjusting acid ensures that the pH value of the cyanamide solution is more stable; the acid spraying pipe enables the acid liquid to be uniformly sprayed on the surface of the cyanamide liquid, so that the cyanamide liquid and the acid liquid can be well and uniformly mixed, and the product quality is stable; the U-shaped pipeline can continuously discharge the cyanamide liquid, and the cyanamide liquid can not enter the second acid adjusting kettle to be discharged, so that the reaction time is ensured.
Drawings
FIG. 1: the structure of the utility model is shown schematically;
FIG. 2 is a schematic diagram: the section view of the acid spraying pipe of the utility model;
shown in the figure: 1. the acid mixing device comprises a first acid mixing kettle, 2, a second acid mixing kettle, a 3.U-shaped pipeline, 4, a first acid inlet pump, 5, a second acid inlet pump, 6, a first pH meter, 7, a second pH meter, 8, a first motor, 9, a first material inlet, 10, a first acid inlet, 11, a first acid spraying pipe, 12, a first stirring shaft, 13, a first stirring paddle, 14, a second motor, 15, a second material inlet, 16, a second acid inlet, 17, a second acid spraying pipe, 18, a second stirring shaft, 19, a second stirring paddle, 20, a second material outlet, 21, a first material outlet, 22, small holes, 23, an acid inlet pipeline and 24, and a fixing frame.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. 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 application belongs.
As the background art shows, based on the technical scheme, the utility model provides an acid adjusting device for continuously adjusting the pH value in the production of cyanamide, which comprises a first acid adjusting kettle 1 and a second acid adjusting kettle 2, wherein the top of the first acid adjusting kettle 1 is provided with a first motor 8, a first feed inlet 9 and a first acid inlet 10, the first motor 8 is connected with a first stirring paddle 13 positioned in the first acid adjusting kettle 1 through a first stirring shaft 12, and the lower part of the first acid adjusting kettle 1 is provided with a first discharge outlet 21; a second motor 14 and a second acid inlet 16 are arranged at the top of the second acid adjusting kettle 2, the second motor 14 is connected with a second stirring paddle 19 positioned in the second acid adjusting kettle 2 through a second stirring shaft 18, a second feed inlet 15 is arranged at the upper part of the second acid adjusting kettle 2, and a second discharge outlet 20 is arranged at the lower part of the second acid adjusting kettle 2; the first outlet 21 is connected to the second inlet 15 via a material line. A first acid spraying pipe 11 is arranged in the first acid adjusting kettle 1 in the horizontal direction, one end of the first acid spraying pipe 11 is connected with a first acid inlet 10 through a vertical acid inlet pipeline 23, the other end of the first acid spraying pipe is arranged at the top of the first acid adjusting kettle 1 through a fixing frame 24, and a plurality of small holes 22 are formed in the bottom of the first acid spraying pipe 11; the second is equipped with the second in the second adjusts sour cauldron 2 and spouts acid pipe 17 on the horizontal direction, and the one end of second spout acid pipe 17 is advanced sour mouth 16 through vertical entering acid pipeline 23 and second and is connected, and the other end passes through mount 24 to be installed at the top that the sour cauldron 2 was adjusted to the second, and the bottom of second spout acid pipe 17 is equipped with a plurality of apertures 22. The first acid inlet 10 is connected with the first acid inlet pump 4, and the second acid inlet 16 is connected with the second acid inlet pump 5. The first discharge port 21 is provided with a first pH meter 6, and the second discharge port 20 is provided with a second pH meter 7. The second discharge port 20 is connected to a U-shaped pipe. The first feeding hole 9, the first discharging hole 21, the second feeding hole 15, the second discharging hole 20, the first acid inlet 10 and the second acid inlet 16 are all provided with valves.
The cyanamide solution enters the first acid adjusting kettle 1 from the first feeding hole 9, the acid solution is pumped into the first acid inlet 10 by the first acid inlet pump 4, and the acid solution enters from the first acid inlet 10 and flows out from the small hole 22 at the bottom of the first acid spraying pipe 11, so that the contact area between the acid solution and the cyanamide solution is larger, and the cyanamide solution is stirred more uniformly. The first motor 8 is started, and the first stirring paddle 13 is driven by the first stirring shaft 12 to mix and stir the cyanamide solution uniformly. Along with the more the cyanamide liquid and the acid liquid advance, the cyanamide liquid after mixing overflows from the first discharge port 21 and enters the second acid regulating kettle 2 through the second feed port 15, the second motor 14 is started, the second stirring paddle 19 is driven by the second stirring shaft 18 to mix the cyanamide liquid, the reaction time is prolonged, and then the cyanamide liquid is discharged from the second discharge port 20. Because the more the cyanamide liquid and the acid liquid in the first acid adjusting kettle 1 advance, the more the cyanamide liquid and the acid liquid can overflow from the first discharge port 21 to the second acid adjusting kettle 2, the reaction time is not enough, and the mixing is not uniform, so that the cyanamide liquid and the acid liquid are continuously stirred and mixed in the second acid adjusting kettle 2, the reaction time is prolonged, and the full reaction is ensured. When the value of the first pH meter 6 is higher than the control value, the acidity is low and does not reach the expected value, the acid needs to be supplemented and adjusted, the acid is pumped into the second acid adjusting kettle 2 by the second acid inlet pump 5, the acid enters from the second acid inlet 16 and enters into the second acid spraying pipe 17 through the acid inlet pipe 23, the acid is uniformly sprayed from the small holes 22 at the bottom, the acid and the cyanamide liquid are uniformly stirred to supplement and adjust the acid, the pH value reaches the control value, and the product quality is stabilized. And a second pH meter 7 detects the pH value of the cyanamide solution when the second acid adjusting kettle 2 discharges the materials. The U-shaped pipeline 3 ensures that the cyanamide liquid can not be discharged as soon as entering the second acid adjusting kettle 2, and ensures the reaction time of the cyanamide liquid and the acid liquid.
In order to make the technical solutions of the present application more clearly understood by those skilled in the art, the technical solutions of the present application will be described in detail below with reference to specific embodiments.
The test materials used in the embodiment of the utility model are the conventional test materials in the field, and can be purchased through commercial channels.
Examples
An acid adjusting device for continuously adjusting pH value in cyanamide production comprises a first acid adjusting kettle 1 and a second acid adjusting kettle 2, wherein the top of the first acid adjusting kettle 1 is provided with a first motor 8, a first feed inlet 9 and a first acid inlet 10, the first motor 8 is connected with a first stirring paddle 13 positioned in the first acid adjusting kettle 1 through a first stirring shaft 12, and the lower part of the first acid adjusting kettle 1 is provided with a first discharge outlet 21; a second motor 14 and a second acid inlet 16 are arranged at the top of the second acid adjusting kettle 2, the second motor 14 is connected with a second stirring paddle 19 positioned in the second acid adjusting kettle 2 through a second stirring shaft 18, a second feed inlet 15 is arranged at the upper part of the second acid adjusting kettle 2, and a second discharge outlet 20 is arranged at the lower part of the second acid adjusting kettle 2; the first outlet 21 is connected to the second inlet 15 via a material line. A first acid spraying pipe 11 is arranged in the first acid adjusting kettle 1 in the horizontal direction, one end of the first acid spraying pipe 11 is connected with a first acid inlet 10 through a vertical acid inlet pipeline 23, the other end of the first acid spraying pipe is installed at the top of the first acid adjusting kettle 1 through a fixing frame 24, and a plurality of small holes 22 are formed in the bottom of the first acid spraying pipe 11; the second is equipped with the second in the second adjusts sour cauldron 2 and spouts acid pipe 17 on the horizontal direction, and the one end of second spout acid pipe 17 is advanced sour mouth 16 through vertical entering acid pipeline 23 and second and is connected, and the other end passes through mount 24 to be installed at the top that the sour cauldron 2 was adjusted to the second, and the bottom of second spout acid pipe 17 is equipped with a plurality of apertures 22. The first acid inlet 10 is connected with the first acid inlet pump 4, and the second acid inlet 16 is connected with the second acid inlet pump 5. The first discharge port 21 is provided with a first pH meter 6, and the second discharge port 20 is provided with a second pH meter 7. The second discharge port 20 is connected to a U-shaped pipe. The first feeding hole 9, the first discharging hole 21, the second feeding hole 15, the second discharging hole 20, the first acid inlet 10 and the second acid inlet 16 are all provided with valves.
The cyanamide solution enters the first acid adjusting kettle 1 from the first feeding hole 9, the acid solution is pumped into the first acid inlet 10 by the first acid inlet pump 4, and the acid solution enters from the first acid inlet 10 and flows out from the small hole 22 at the bottom of the first acid spraying pipe 11, so that the contact area between the acid solution and the cyanamide solution is larger, and the cyanamide solution is stirred more uniformly. The first motor 8 is started, and the first stirring paddle 13 is driven by the first stirring shaft 12 to mix and stir the cyanamide solution uniformly. Along with the more the cyanamide liquid and the acid liquid advance, the cyanamide liquid after mixing overflows from first discharge gate 21 and gets into second adjusting acid cauldron 2 through second feed inlet 15, and second motor 14 starts, drives second stirring rake 19 through second (mixing) shaft 18 and mixes cyanamide liquid, prolongs reaction time, later goes out the ejection of compact from second discharge gate 20. Because the more the cyanamide liquid and the acid liquid in the first acid adjusting kettle 1 advance, the more the cyanamide liquid and the acid liquid can overflow from the first discharge port 21 to the second acid adjusting kettle 2, the reaction time is not enough, and the mixing is not uniform, so that the cyanamide liquid and the acid liquid are continuously stirred and mixed in the second acid adjusting kettle 2, the reaction time is prolonged, and the full reaction is ensured. When the value of the first pH meter 6 is higher than the control value, the acidity is low and does not reach the expected value, the acid needs to be supplemented and adjusted, the acid is pumped into the second acid adjusting kettle 2 by the second acid inlet pump 5, the acid enters from the second acid inlet 16 and enters into the second acid spraying pipe 17 through the acid inlet pipe 23, the acid is uniformly sprayed from the small holes 22 at the bottom, the acid and the cyanamide liquid are uniformly stirred to supplement and adjust the acid, the pH value reaches the control value, and the product quality is stabilized. And a second pH meter 7 detects the pH value of the cyanamide solution when the second acid adjusting kettle 2 discharges the materials. The U-shaped pipeline 3 ensures that the cyanamide liquid can not be discharged as soon as entering the second acid adjusting kettle 2, and ensures the reaction time of the cyanamide liquid and the acid liquid.
By using the acid adjusting device for continuously adjusting the pH value, 120 tons of cyanamide liquid can be adjusted every day, and the intermittent acid adjusting method can only adjust 100 tons of acid every day by using 2 acid adjusting kettles with the same volume, so that the production efficiency is improved by 20 percent compared with the intermittent acid adjusting method; the utility model discloses an it has realized continuous adjustment pH value to transfer sour device, needn't frequently feed, advance sour, the ejection of compact, and the resource cost of using manpower sparingly has improved production efficiency.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (6)
1. An acid adjusting device for continuously adjusting pH value in cyanamide production is characterized by comprising a first acid adjusting kettle and a second acid adjusting kettle, wherein the top of the first acid adjusting kettle is provided with a first motor, a first feed inlet and a first acid inlet; the top of the second acid regulating kettle is provided with a second motor and a second acid inlet, the second motor is connected with a second stirring paddle positioned in the second acid regulating kettle through a second stirring shaft, the upper part of the second acid regulating kettle is provided with a second feed inlet, and the lower part of the second acid regulating kettle is provided with a second discharge outlet; the first discharge port is connected with the second feed port through a material pipeline.
2. The acid regulating device according to claim 1, wherein a first acid spraying pipe is arranged in the first acid regulating kettle in the horizontal direction, one end of the first acid spraying pipe is connected with a first acid inlet through a vertical acid inlet pipeline, and the bottom of the first acid spraying pipe is provided with a plurality of small holes; and a second acid spraying pipe is arranged in the second acid adjusting kettle in the horizontal direction, one end of the second acid spraying pipe is connected with a second acid inlet through a vertical acid inlet pipeline, and a plurality of small holes are formed in the bottom of the second acid spraying pipe.
3. The acid regulating device according to claim 1, wherein the first acid inlet is connected with a first acid inlet pump, and the second acid inlet is connected with a second acid inlet pump.
4. The acid regulating device of claim 1, wherein the first discharge port is provided with a first pH meter, and the second discharge port is provided with a second pH meter.
5. The acid regulating device according to claim 1, wherein the second discharge port is connected with a U-shaped pipeline.
6. The acid regulating device according to claim 1, wherein the first feeding port, the first discharging port, the second feeding port, the second discharging port, the first acid inlet and the second acid inlet are provided with valves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222207172.9U CN218393670U (en) | 2022-08-22 | 2022-08-22 | Acid adjusting device for continuously adjusting pH value in cyanamide production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222207172.9U CN218393670U (en) | 2022-08-22 | 2022-08-22 | Acid adjusting device for continuously adjusting pH value in cyanamide production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218393670U true CN218393670U (en) | 2023-01-31 |
Family
ID=85028379
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222207172.9U Active CN218393670U (en) | 2022-08-22 | 2022-08-22 | Acid adjusting device for continuously adjusting pH value in cyanamide production |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218393670U (en) |
-
2022
- 2022-08-22 CN CN202222207172.9U patent/CN218393670U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107824061A (en) | A kind of high-efficiency dissolution device for formulating of liquid fertilizer | |
| CN218393670U (en) | Acid adjusting device for continuously adjusting pH value in cyanamide production | |
| CN105669428B (en) | A kind of production method of calcium hydrogen citrate | |
| CN115894094A (en) | Method for producing liquid fertilizer by using yeast residue | |
| CN209901125U (en) | A constant speed liquid feeding stirred tank for coating production | |
| CN211190011U (en) | A medicament mixing arrangement for domestic sewage | |
| CN204737736U (en) | Carbonization reaction unit of nano calcium carbonate production | |
| CN109554284A (en) | A kind of high solid content rubbish from cooking anaerobic processing device and its application method producing biogas | |
| CN211800841U (en) | Titanium white hydrolysis dilution water feeding device | |
| CN214439027U (en) | Production device for preparing ammonium formate by continuously ammoniating formic acid | |
| CN211158679U (en) | Gas-liquid two-phase continuous reaction crystallization device | |
| CN209669214U (en) | A kind of high solid content rubbish from cooking anaerobic processing device producing biogas | |
| CN220485507U (en) | High-concentration acrylonitrile wastewater treatment device | |
| CN209890621U (en) | Delaying type fermentation tank feeding mechanism | |
| CN209973160U (en) | Feeding device is used in processing of ammonium nitrate raw materials | |
| CN113845998A (en) | Anaerobic fermentation circulating device | |
| CN218811694U (en) | Conversion equipment is used in production of gamma-aminobutyric acid | |
| CN221192036U (en) | Fermenting installation is used in fertilizer production | |
| CN221085565U (en) | Acid adding device for white carbon black processing | |
| CN204672155U (en) | Fertilizer mixing arrangement | |
| CN205170712U (en) | High -efficient malononitrile production line | |
| CN212974880U (en) | Special selenium-rich fertilizer apparatus for producing of rice | |
| CN216224377U (en) | Hydroximic acid reation kettle cooling device | |
| CN110255596A (en) | A kind of continuous carbonation technique preparing calcium carbonate | |
| CN220940260U (en) | Production device for amino acid-containing water-soluble fertilizer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |