CN110170140B - Production method of high-quality dry powder extinguishing agent - Google Patents
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D1/00—Fire-extinguishing compositions; Use of chemical substances in extinguishing fires
- A62D1/0007—Solid extinguishing substances
- A62D1/0014—Powders; Granules
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Abstract
The invention provides a production method of a high-quality dry powder extinguishing agent, which comprises the steps of crushing, pre-drying and silicone oil adding, conveying and drying, cross-linking and curing and screening. The combined process effectively improves the material performance, greatly improves the production efficiency, improves the product quality and is suitable for large-scale production of high-quality dry powder extinguishing agents.
Description
Technical Field
The invention belongs to the field of fire safety, and relates to a production method of a high-quality dry powder extinguishing agent.
Background
The dry powder extinguishing agent has the characteristics of high extinguishing speed, large extinguishing area, good extinguishing cost effect of equivalent unit, wide application temperature range, no harm to the environment, no need of external power water source, convenient use and the like, and is widely applied to the field of fire safety. Recently, new national standards of dry powder extinguishing agents are implemented, and higher requirements are put on the quality of the dry powder extinguishing agents. The past production process has many defects, and the production requirement of high-quality dry powder fire extinguishing agent is difficult to meet.
The conventional production process of the dry powder extinguishing agent generally comprises the steps of raw material crushing, addition of various auxiliary materials, mixing and stirring (mixing and dispersing), drying, silicification (silicone oil mixing and dispersing and crosslinking curing), screening and inspection and the like, and sometimes, a drying step is required after crosslinking and curing. Wherein, a plurality of steps of adding auxiliary materials, mixing and dispersing, drying, silicification, re-drying and the like are generally carried out in a mixing stirrer. However, such processes have a number of disadvantages.
Take the production of the ammonium dihydrogen phosphate dry powder extinguishing agent of conventional in the past as an example, at first, dry or dry again in the mixer-blender, because the inner space of mixer-blender is occupied by a large amount of powder, consequently the vapor that the stoving/step of drying again was dried out can't in time be discharged, leads to drying efficiency low, the effect is poor, and product moisture content, moisture absorption rate index are difficult to control. Second, in the silicification step, in order to promote the progress of crosslinking and curing, it is generally necessary to raise the temperature of the powder to a temperature higher than 100 ℃ to perform the reaction. However, at high temperature, the materials with insufficient water removal in the early stage further evaporate water, ammonium dihydrogen phosphate begins to decompose and release ammonia and silicon oil to form atomized steam, the mixture of the water vapor, the ammonia and the silicon oil atomized steam cannot be effectively removed in time, and the mixture can adhere to the surface of the powder after the powder is silicided, so that the quality of the dry powder is reduced, and the phenomena of agglomeration, overproof water content, high moisture absorption rate, unqualified electrical insulation, poor flowability, poor water repellency, unqualified chassis and the like occur. In order to produce qualified products, measures such as prolonging the drying time, prolonging the mixing and dispersing time, increasing the dosage of the silicone oil, increasing the crosslinking and curing reaction temperature of the silicone oil, adding various auxiliaries, prolonging the crosslinking and curing reaction time of the silicone oil and the like have to be taken, so that the production efficiency is low, the energy consumption is high, the cost of the auxiliaries is increased, and the qualification rate of the products is still difficult to ensure. Therefore, the prior production process of the dry powder extinguishing agent cannot meet the requirement of large-scale production of high-quality dry powder extinguishing agent.
Disclosure of Invention
Problems to be solved by the invention
The conventional production process of the dry powder extinguishing agent in the past has the problems of insufficient drying, poor silicification effect, difficulty in controlling the product quality, high production cost, low efficiency, incapability of stably producing high-quality products on a large scale and the like. The invention solves one or more of the problems by improving the production process of the superfine dry powder extinguishing agent.
Means for solving the problems
In order to solve the problems in the prior art, the present disclosure provides a production method of a high quality dry powder fire extinguishing agent, which is characterized by comprising the following steps:
a crushing step: sending the raw materials of the components except the silicone oil in the dry powder extinguishing agent into a pulverizer to pulverize the materials;
pre-drying and adding silicone oil: sending the crushed materials into a mixing stirrer, primarily drying out moisture in the materials by heating, adding silicone oil, and uniformly dispersing the silicone oil by stirring;
a conveying and drying step: conveying the material added with the dispersed silicone oil to a cyclone separator, performing phase separation on the material by using the cyclone separator, retaining separated powder, and discharging separated moisture;
and (3) crosslinking and curing: sending the separated powder into a high-speed stirrer to crosslink and solidify the silicone oil;
screening: and stirring and mixing the powder after the crosslinking and solidification, cooling and screening to obtain the dry powder extinguishing agent.
In the production method of the high-quality dry powder extinguishing agent provided by the further embodiment of the disclosure, in the pre-drying and silicone oil adding step, silicone oil is added after the temperature of the material is raised to 60 ℃.
In the method for producing the high-quality dry powder extinguishing agent provided by the further embodiment of the disclosure, the inside of the mixing stirrer is under negative pressure.
In the production method of the high-quality dry powder extinguishing agent provided by the further embodiment of the disclosure, in the pre-drying and silicone oil adding step, the adding amount of the silicone oil is 0.4-1% of the total mass of all the components of the dry powder extinguishing agent.
In the production method of the high-quality dry powder extinguishing agent provided by the further embodiment of the disclosure, in the conveying and drying step, the moisture content of the powder separated by the cyclone separator is less than or equal to 0.25 percent.
In the method for producing a high-quality dry powder extinguishing agent provided in a further embodiment of the present disclosure, in the crosslinking curing step, the reaction temperature for crosslinking and curing the silicone oil is 90 to 100 ℃.
In the method for producing a high-quality dry powder extinguishing agent provided by a further embodiment of the present disclosure, the stirring speed of the high-speed stirrer in the crosslinking and curing step is 800-1000 rpm.
In the production method of the high-quality dry powder extinguishing agent provided by the further embodiment of the disclosure, mica, graphite, vermiculite, zeolite, perlite, magnesite, talc, silicate, carbonate and activated clay are not added in the production process.
In a method of producing a high quality dry powder fire extinguishing agent provided in a further embodiment of the present disclosure, the pulverizer is a Ramon pulverizer.
In the production method of the high-quality dry powder extinguishing agent provided by the further embodiment of the disclosure, in the conveying and drying step, the material added with the dispersed silicone oil is conveyed to the cyclone separator by using the Roots powder feeder.
ADVANTAGEOUS EFFECTS OF INVENTION
The present disclosure achieves the following advantageous technical effects in one or more aspects:
1) the combined process is adopted, and the mixing stirrer, the Roots powder feeder, the cyclone separator and the high-speed stirrer respectively play their roles and are matched with each other.
2) The negative pressure mixing stirring is adopted, so that the drying efficiency is improved, and the production environment problem caused by easy dust leakage in the production process of the mixing stirrer is solved.
3) The Roots powder feeder and the cyclone separator used in the process can quickly separate and replace the dried water in the material, really reduce the water content of the material, and effectively prevent a series of quality problems of product caking, high water content and the like.
4) The dry powder extinguishing agent produced by the process has wide type adaptability, and ABC dry powder extinguishing agent, BC dry powder extinguishing agent, D type dry powder extinguishing agent, superfine ABC dry powder extinguishing agent and the like with ammonium dihydrogen phosphate content of 40-95% can be produced by the process.
5) The process disclosed by the invention can obtain a product with excellent electrical insulation performance, vibration resistance, practicability, fluidity and jetting property and long quality guarantee period without adding various auxiliary materials.
Detailed Description
Various exemplary embodiments, features and aspects of the disclosure are described in detail below. The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. In some instances, methods, means, reagents and devices well known to those skilled in the art are not described in detail, but those skilled in the art can implement the technical solutions of the present disclosure based on the general knowledge in the art.
The process of the present disclosure can be used to produce various types of dry powder extinguishing agents. One exemplary finished dry powder extinguishing agent comprises the following components (expressed by mass fraction of each component in the finished product):
ammonium dihydrogen phosphate: 40 to 95 percent of the total weight of the mixture,
ammonium sulfate: 0 to 40 percent of the total weight of the mixture,
hydrophobic white carbon black: 0 to 1 percent of the total weight of the mixture,
silicone oil: 0.4 to 1 percent of the total weight of the mixture,
pigment: 0 to 0.1 percent of the total weight of the mixture,
silicon dioxide or salt sludge: 0-15% (the main components of the salt mud are barium sulfate, calcium carbonate and sodium chloride).
During production, raw materials of corresponding components are properly selected according to the component content of a target product to be produced. Wherein: if the product type with the nominal ammonium dihydrogen phosphate main content of more than or equal to 90 percent is produced, the raw material can not contain ammonium sulfate; if the product type with the nominal ammonium dihydrogen phosphate main content of more than or equal to 90 percent is produced, the raw materials do not contain silicon dioxide or salt mud; if a white-appearing dry powder fire extinguishing product is produced, the raw material may not contain pigments.
The exemplary dry powder extinguishing agents listed above have ammonium dihydrogen phosphate as the first major component (i.e., the component with the highest content in the finished product). The dry powder extinguishing agents that the process of the present disclosure is suitable for producing are not limited to the exemplary dry powder extinguishing agents described above. Various ABC dry powder extinguishing agents, BC dry powder extinguishing agents, class D dry powder extinguishing agents and the like with other components as the first main component can also be produced by the process disclosed by the invention.
The method for producing the high quality dry powder fire extinguishing agent of the present invention is described in detail below.
(1) Pulverizing
In the step, the raw materials of the basic components in the dry powder extinguishing agent are sent to a pulverizer to be pulverized. The pulverizer is preferably a Ramon pulverizer. The dry powder extinguishing agent base component refers to a component except silicone oil in the formula of the dry powder extinguishing agent. For smooth proceeding of the subsequent production process, the water content of the raw material is preferably not more than 1%. If the water content exceeds 1%, it is considered to replace the raw material or to dry the raw material in advance.
The hydrophobic white carbon black used as the grinding aid is an optional raw material component, and whether the hydrophobic white carbon black is added or how much the hydrophobic white carbon black is added in the process of feeding the raw material to the grinder can be determined according to the water content of the raw material of the basic component. For example, if the water content of the raw materials of the basic component is less than or equal to 0.3 percent, the hydrophobic white carbon black can not be added; if the water content of the basic component raw material is higher than 0.3% and not more than 1%, the hydrophobic white carbon black can be properly added, and the adding amount of the hydrophobic white carbon black is not more than 1% of the total mass of all the components of the fire extinguishing agent.
The base component raw materials are crushed by a crusher. The degree of comminution can be determined by the person skilled in the art on the basis of the type of target product, the quality criteria and the grade of execution. For example, for the production of ABC dry powder fire extinguishing agent, it is possible to pulverize to such a degree that the mass percentage of fine particles having a particle size of 40 μm or less to the total mass of the powder is not less than 55%, and the mass fraction of the first main component in the fine particles having a particle size of 40 μm or less is not less than the mass fraction of the first main component nominal to the target product.
(2) Prebaking and adding silicone oil
And (3) feeding the crushed material obtained in the last step into a mixing stirrer, heating while stirring, and gradually raising the temperature of the material to a target temperature so as to promote the moisture to be primarily dried out of the material. The target temperature of temperature rise is preferably over 60 ℃, which is helpful for ensuring the effect of primarily drying out the moisture. But the target temperature for raising the temperature is not required to be too high so as to prevent some components in the material from being decomposed by heat. For example, the target temperature for the temperature rise is preferably 60 to 80 ℃, more preferably 60 to 70 ℃. The duration of the temperature raising process is not particularly limited, but from the viewpoint of ensuring a comprehensive balance between the pre-drying effect and time and energy saving, the temperature raising process is preferably continued for 30 to 60 minutes.
And (4) after the temperature is raised for a period of time or the temperature is raised, adding silicone oil into the material. It is preferred to add the silicone oil after the temperature of the mass has risen to 60 c, since the viscosity of the silicone oil is low at higher temperatures, which facilitates dispersion. And (4) continuously stirring after adding the silicone oil until the silicone oil is fully dispersed and attached in the powder. The temperature of the materials is preferably kept above 60 ℃ in the stirring process, which is helpful for dispersing the silicone oil and also plays a role in continuous pre-drying. The time for which stirring is continued after the addition of the silicone oil is preferably about 1 hour.
The adding amount of the silicone oil can be reasonably determined according to the average particle size of powder required by the product, a central control inspection result, production equipment and other factors, for example, if a new national standard common type 75 ammonium dihydrogen phosphate +15 ammonium sulfate dry powder extinguishing agent product is produced, the adding amount of the silicone oil can be 0.4-0.6 percent of the total mass of all components of the dry powder extinguishing agent; if a product with smaller average particle size is produced, the amount of the silicone oil can be increased properly due to the large specific surface area of the powder, for example, the amount of the silicone oil added can be 0.6-1% of the total mass of all the components of the dry powder extinguishing agent.
Preferably, mix the inside negative pressure that is of mixer, can improve the efficiency that moisture tentatively baked out from the raw materials on the one hand, on the other hand can effectively prevent to mix the dust leakage in the mixer production process, avoids causing the production environment problem, also prevents material loss.
(3) Transport drying
The material added with the dispersed silicone oil is conveyed to a cyclone separator, and particularly preferably, the material added with the dispersed silicone oil is conveyed to the cyclone separator by a Roots powder feeder. The material was phase separated (mainly solid-gas phase separation) using a cyclone. Under the action of the cyclone separator, the powder particles in the material are separated from the air (containing steam evaporated during pre-drying). After separation, the solid phase powder particles are collected and sent to the next step where the gas, moisture, etc. are evacuated. In addition, the tail gas of the cyclone separator may contain a small amount of powder, a dust remover can be used for collecting and returning the small amount of powder in the tail gas to the mixing stirrer, and the air and moisture treated by the dust remover can be exhausted.
The cyclone separator (and the preferable Roots powder feeder) used in the step not only conveys and separates materials, but also has the more important function of separating and replacing water vapor, and effectively prevents the water vapor from being condensed into the powder again. In the last step, the hybrid mixer intensifies and makes the moisture in the material tentatively dry out, nevertheless because the material is in the narrow and small environment of relative seal, the material is still being surrounded to the vapor that dries out, if not in time with vapor separation, then vapor condenses again very easily, bonds on the material surface, causes the material caking, product moisture content is high, difficult save scheduling problem. However, the cyclone separator (and the preferred Roots powder feeder) in the step creates a condition that the powder particles are in sufficient contact with air, and the moisture can be quickly separated and displaced to be discharged. Therefore, the temperature rising pre-drying in the last step and the cyclone separator (and the optimized Roots powder feeder) in the last step have the mutual matching effect, firstly, the moisture in the material is heated and evaporated, then, the evaporated moisture is separated in time, the drying of the material is practically and reliably realized, and the problems of subsequent material agglomeration, excessive moisture content, difficult storage and the like can be effectively prevented.
The moisture content of the powder after separation by the cyclone separator is preferably 0.25% or less, more preferably 0.15% to 0.25%, and particularly preferably 0.16% to 0.2%. If the water content of the powder separated by the cyclone separator is controlled in the preferred range and a part of water is consumed in the subsequent crosslinking and curing process, the water content of the powder after the subsequent crosslinking and curing is extremely low and further drying is not needed.
(4) Crosslinking and curing
And (3) conveying the solid powder separated by the cyclone separator into a high-speed stirrer, and quickly crosslinking, polymerizing and curing the silicone oil dispersed on the surface of the powder, thereby forming a hydrophobic film on the surface of the powder.
Compared with a common stirrer, the linear velocity of the powder moving in the high-speed stirrer is large, the powder is strongly collided and rubbed, and the conditions are favorable for forming the silicone oil film, so that the crosslinking curing can be carried out at a lower temperature, the required amount of the silicone oil is small, the crosslinking curing reaction is rapid, the silicone oil film completely coats the powder, and the coating shape is good. The stirring speed of the high-speed stirrer is preferably 800-1000 rpm.
The reaction temperature of crosslinking and curing is preferably 90-100 ℃, the temperature is enough to smoothly complete the crosslinking and polymerization process, the decomposition of ammonium dihydrogen phosphate caused by overhigh temperature to release ammonia gas can be avoided, the atomization of silicone oil is prevented, and the improvement of the product quality is facilitated.
The reaction time for crosslinking and curing is not particularly limited, but continuous crosslinking and curing is preferably carried out, so that the production process can be continuously and efficiently carried out. And during continuous crosslinking and curing, the powder actually stays in the high-speed stirrer for about 2 minutes, and the reaction is finished.
The materials after the crosslinking and solidification are completed can be circulated back to the mixing stirrer to be stirred and mixed so as to facilitate the central control analysis, and the materials are cooled after the analysis and detection are qualified; or the material after the crosslinking and solidification can also directly enter a cooling stirrer to be stirred and cooled.
(5) Sieving
And (4) cooling the material after the crosslinking and solidification, and screening to obtain a finished product. And selecting the control indexes of screening according to the quality requirement of the target product.
For example, the particle size distribution (expressed as mass fraction) of the sieved powder may be:
＞250μm：0.0％，
250μm～125μm：0.0％～6.0％，
125μm～63μm：10.0％～22.0％，
63μm～40μm：6.0％～28.0％，
<40um：≥55％。
other product particle size distribution control indexes can be selected according to different target products.
And weighing, inspecting, packaging and warehousing the finished product according to a conventional mode.
The further improvement scheme is as follows:
in the past, various auxiliary materials need to be added for the reasons of ensuring good material flow, sufficient crushing and the like. However, the auxiliary materials are different from the basic components of the dry powder extinguishing agent in physical and chemical properties, have negative influence on the cross-linking and curing process of the silicone oil, and restrict the further improvement of the product quality. The present disclosure improves upon the process steps by which the powder is sufficiently pulverized, separated, and reliably dried prior to cross-linking and curing to provide good properties to the material, thereby reducing or avoiding the use of a range of auxiliary materials. Therefore, in the process of the present disclosure, it is preferable not to add auxiliary materials such as mica, graphite, vermiculite, etc.; preferably, no zeolite, perlite, magnesite, talc, silicate, carbonate or other auxiliary materials are added. The process disclosed by the invention is adopted to treat the materials, the production process can be smoothly carried out even if the auxiliary materials are not added, and the silicone oil has a good film forming effect, so that the product has good electrical insulation performance, dry powder compaction resistance, fluidity and spraying performance. In addition, because the materials are already processed into a state suitable for reaction before crosslinking and curing, and good reaction conditions are provided by high-speed stirring, a silicone oil polymerization catalyst such as activated clay and alkaline earth metal carbonate and an anti-mildew agent are not added in the preferred process, the crosslinking and curing reaction can be well carried out under the condition of not adding the components, and the quality guarantee period of the obtained product is long.
Embodiments of the present disclosure will be described in detail below with reference to examples, but those skilled in the art will appreciate that the following examples are only illustrative of the present disclosure and should not be construed as limiting the scope of the present disclosure. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.
Comparative example 1
4998 kg of raw ammonium dihydrogen phosphate (purity 90%) and 912 kg of raw ammonium sulfate are taken. The water content of the raw material is 0.4%. The raw materials are sent into a Raymond pulverizer, 60 kg of hydrophobic white carbon black is added in the feeding process, and then the raw materials are pulverized. After crushing, the materials are metered into a mixing stirrer, the materials are heated to 60 ℃ while stirring for drying, and the heating process lasts for about 1 hour. The temperature was then maintained for an additional 3 hours. Then 30 kg of silicone oil is added, and stirring is continued for 1 hour, so that the silicone oil is uniformly dispersed. The contents of the mixer were then further warmed to 115 ℃ and kept at that temperature for 5 hours with continued stirring to effect crosslinking and curing. And after the crosslinking and solidification are finished, cooling and screening the material to obtain a finished product.
The results of the finished product inspection of comparative example 1 are as follows:
(recovery of the particle size distribution test is greater than 98%, experimental deviation is within the standard tolerance range)
Example 1
6664 kg of ammonium dihydrogen phosphate (90% purity) and 1216 kg of ammonium sulfate are taken as raw materials. The water content of the raw material is 0.4%. The raw materials are sent into a Raymond pulverizer, 80 kg of hydrophobic white carbon black is added in the feeding process, and then the raw materials are pulverized. After crushing, the materials are metered into a mixing stirrer, the materials are heated to 60 ℃ while stirring for drying, and the heating process lasts for about 1 hour. Then 40 kg of silicone oil is added, and stirring is continued for 1 hour to uniformly disperse the silicone oil.
Then the material is conveyed to a cyclone separator by a Roots powder feeder, and the moisture is further removed, wherein the operation parameter of the Roots powder feeder is 1200 cubic air per hour, and 8 tons of powder are fed per hour. The operating parameters of the cyclone separator were: separation wind speed 20 m/s, dilute phase: the volume ratio of the powder to the air is 2 percent. After passing through the cyclone, the water content of the material was 0.18%. The separated materials are sent into a high-speed stirrer for crosslinking and curing, the rotating speed of the high-speed stirrer is 900 revolutions per minute, and the crosslinking and curing reaction temperature is 98 ℃. And (3) continuously silicifying, wherein the powder stays for about 2 minutes in high-speed stirring, and the time for completing crosslinking and curing of all materials is less than 2 hours. And (4) feeding the silicified material into a cooling stirrer, stirring and cooling, and then screening to obtain a finished product.
The results of the finished product inspection of example 1 are as follows:
(recovery of the particle size distribution test is greater than 98%, experimental deviation is within the standard tolerance range)
Comparing comparative example 1 and example 1 it can be seen: under the condition that the proportion of the raw materials is the same, the comparative example 1 adopts the modes of mixing and stirring, heating and drying, silicone oil adding and dispersing, and silicone oil crosslinking and curing to be intensively carried out to process 6 tons of raw materials, the drying process lasts for 4 hours, the silicone oil crosslinking and curing takes 5 hours, the energy consumption in the production process is high, and the finished product still has unqualified items; and in the embodiment 1, a Roots powder feeder, a cyclone separator and a high-speed stirrer are adopted, the related steps are dispersedly carried out, more raw materials (8 tons) are processed, the total time consumption is obviously reduced, the required crosslinking curing reaction temperature is also lower, and all indexes of the finally obtained product are qualified and are comprehensively superior to those of the product in the comparative example 1.
Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (9)
1. A production method of a high-quality dry powder extinguishing agent is characterized by comprising the following steps:
a crushing step: sending the raw materials of the components except the silicone oil in the dry powder extinguishing agent into a pulverizer to pulverize the materials;
pre-drying and adding silicone oil: feeding the crushed materials into a mixing stirrer, primarily drying the moisture in the materials by heating to 60-80 ℃, adding silicone oil, and uniformly dispersing the silicone oil by stirring;
a conveying and drying step: conveying the material added with the dispersed silicone oil to a cyclone separator, separating the material by using the cyclone separator, separating powder particles in the material from air containing water vapor evaporated during pre-drying, retaining the separated powder, and discharging the separated water;
and (3) crosslinking and curing: sending the separated powder into a high-speed stirrer to crosslink and solidify the silicone oil, wherein the reaction temperature of the crosslinking and solidification of the silicone oil is 90-100 ℃;
screening: and stirring and mixing the powder after the crosslinking and solidification, cooling and screening to obtain the dry powder extinguishing agent.
2. The method for producing a high-quality dry powder extinguishing agent according to claim 1, wherein in the pre-drying and silicone oil adding step, the silicone oil is added after the temperature of the material is raised to 60 ℃.
3. The method for producing a high-quality dry powder extinguishing agent according to claim 1 or 2, wherein the inside of the mixing and stirring machine is under negative pressure.
4. The production method of high quality dry powder extinguishing agent according to claim 1 or 2, characterized in that in the pre-drying and silicone oil adding step, the amount of silicone oil added is 0.4% -1% of the total mass of all the components of the dry powder extinguishing agent.
5. The method for producing a high-quality dry powder extinguishing agent according to claim 1 or 2, wherein the moisture content of the powder separated by the cyclone separator in the conveying and drying step is less than or equal to 0.25%.
6. The method for producing a high quality dry powder extinguishing agent as recited in claim 1 or 2, wherein the stirring speed of the high speed stirrer in the crosslinking curing step is 800-1000 rpm.
7. The production method of the high-quality dry powder extinguishing agent according to claim 1 or 2, characterized in that mica, graphite, vermiculite, zeolite, perlite, magnesite, talc, silicate, carbonate and activated clay are not added in the production process.
8. The method for producing a high-quality dry powder extinguishing agent according to claim 1 or 2, wherein the pulverizer is a Raymond pulverizer.
9. The production method of a high-quality dry powder extinguishing agent according to claim 1 or 2, characterized in that in the step of conveying and drying, the material added with dispersed silicone oil is conveyed to the cyclone separator by a roots powder feeder.
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