CN109332682B - Production device and production method of stearic acid coated aluminum powder - Google Patents
Production device and production method of stearic acid coated aluminum powder Download PDFInfo
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- CN109332682B CN109332682B CN201811496831.7A CN201811496831A CN109332682B CN 109332682 B CN109332682 B CN 109332682B CN 201811496831 A CN201811496831 A CN 201811496831A CN 109332682 B CN109332682 B CN 109332682B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
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- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F1/102—Metallic powder coated with organic material
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Abstract
The invention discloses a production device and a production method of stearic acid coated aluminum powder, wherein the production device comprises a mixing tank with a stirring device, a condenser, a solvent storage tank, a negative pressure pumping device, a tail gas discharge pipe and a nitrogen supply device, the mixing tank, the condenser, the solvent storage tank and the negative pressure pumping device are sequentially connected, the mixing tank is provided with a jacket, the tail gas discharge pipe is connected with the negative pressure pumping device, and the nitrogen supply device is connected with a nitrogen inlet of the mixing tank. Before the reaction materials are put into the reactor, the production device is subjected to forced gas exchange of air and nitrogen, then the solvent, the aluminum powder and the stearic acid are added, a jacket is filled with hot oil to heat the reaction tank, the materials are heated and evaporated under the negative pressure state, the evaporated solvent is condensed and recovered, and the evaporated and dried product is the stearic acid coated aluminum powder product. The product obtained by the production device and the production method of the invention has the advantages that the stearic acid is quite comprehensive and uniform in coating the aluminum powder, free stearic acid is not contained, and the aluminum powder cannot be coated.
Description
Technical Field
The invention relates to the technical field of aluminum powder surface treatment, in particular to a production device of stearic acid coated aluminum powder and a production method of stearic acid coated aluminum powder.
Background
The aluminum powder is one of common metal pigments, has high surface activity, and is easy to oxidize and inactivate the surface of uncoated aluminum powder in the storage and use processes, so that a layer of oxide is formed on the surface layer, the activity is reduced, and the use performance of the uncoated aluminum powder is influenced. In addition, the aluminum powder has light weight, so that dust can be generated in the processes of preparation, treatment, packaging, storage, transportation and use, the aluminum powder can react with water, and the aluminum powder and hydrogen generated by the reaction have the possibility of explosion, so that great potential safety hazards exist. Therefore, it is very important to perform a safety treatment on the surface of the powdery aluminum.
At present, the safety treatment of the surface of the aluminum powder at home and abroad mainly adopts a coating method, wherein the coating method is to coat one or more layers of organic/inorganic nano particles on the surface of the aluminum powder to isolate the contact of the aluminum powder with air and water and reduce the formation of an oxide layer, so that the safety, the stability, the dust emission prevention and the like at normal temperature are met. At present, stearic acid is used for coating aluminum powder in the safety treatment of the firework and cracker industry, but stearic acid is added in the dry ball milling process of the aluminum powder, and the aluminum powder is coated by edging while being influenced by the stearic acid dosage, the number of ball milling steel balls, the rotating mode and the transmission mode, so that some aluminum powder which is not coated in place or even not coated at all inevitably exists, and certain potential safety hazards still exist in the later application.
Disclosure of Invention
Aiming at the defects, the invention provides a production device and a production method of stearic acid coated aluminum powder, and aims to solve the technical problems that the stearic acid coated aluminum powder is incomplete in surface coating, is easy to generate dust during transportation and use, and has potential explosion safety hazards.
According to one aspect of the invention, the production device of stearic acid coated aluminum powder comprises a mixing tank with a stirring device, a condenser, a solvent storage tank, a negative pressure pumping device, a tail gas discharge pipe and a nitrogen supply device, wherein the mixing tank, the condenser, the solvent storage tank and the negative pressure pumping device are sequentially connected, the mixing tank is provided with a jacket, heat conduction oil is introduced into the jacket for heating or cooling the mixing tank, the tail gas discharge pipe is connected with the negative pressure pumping device, and the nitrogen supply device is connected with a nitrogen inlet of the mixing tank.
The mixing tank is provided with the jacket, and a heating evaporation mode of introducing heating oil into the jacket is adopted, so that the uniform heating, the balanced evaporation and the drying of all parts of the mixed solution are favorably ensured, and the relative uniformity of a coating layer of a product is ensured. Meanwhile, at the moment that the solvent is evaporated to be dried, the stearic acid which is still in a liquid state can be lost from the surface of the aluminum powder to cause incomplete coating, and at the moment, cold oil is introduced into the jacket to carry out quenching, so that the stearic acid can be ensured to be completely solidified on the surface of the aluminum powder.
When the aluminum powder is poured into the stearic acid-solvent mixed solution, chemical reaction is very easy to generate, hydrogen with explosion danger is generated, and production potential safety hazards are formed.
The invention is provided with the negative pressure pumping device, negative pressure evaporation is adopted during evaporation, the solvent can be ensured to evaporate at a lower temperature, the stearic acid structure is prevented from being damaged, and the solvent is recovered, so that the production cost can be greatly reduced.
The invention is provided with the tail gas discharge pipe, the forced exchange of nitrogen and air is carried out on the production system formed by the whole production device before the reaction starts, the air of the reaction system is discharged, the contact between aluminum powder and oxygen is isolated, and during evaporation and condensation, the uncondensed impurity gas can also be discharged out of the system through the tail gas discharge pipe.
Further, the mixing tank shell layer in the jacket is provided with a heat conducting layer coating. The heat conducting layer coating is used for conducting heat uniformly, so that materials in the tank body are heated more uniformly. Preferably, the heat conductive layer coating is a ceramic coating.
Furthermore, the stearic acid-coated aluminum powder production device further comprises a heat-conducting medium circulating device, wherein the heat-conducting medium circulating device comprises an oil storage tank and an oil transfer pump, the oil storage tank is respectively connected with an inlet and an outlet of the jacket to form a circulating loop, and the oil transfer pump is arranged on a heat-conducting oil conveying pipeline.
Further, the oil storage tank comprises a hot oil storage tank and a cold oil storage tank, and the oil transfer pump comprises a hot oil transfer pump and a cold oil transfer pump. Hot oil is used for heating the mixing tank during reaction, and cold oil is used for introducing cold oil into the jacket for quenching at the moment when the solvent is evaporated to be dried so as to ensure that stearic acid is completely solidified on the surface of the aluminum powder.
Further, the solvent storage tank is connected with the solvent inlet of the mixing tank through a pipeline.
Further, a solvent delivery pump is arranged on the solvent storage tank and the solvent delivery pipe of the mixing tank.
Furthermore, the dog-house, discharge gate, nitrogen gas air inlet of blending tank all are equipped with the valve, and the tail gas delivery pipe is equipped with the tail gas discharge valve, and the gas vent is equipped with gaseous detection device, the blending tank is equipped with temperature measurement thermocouple and level gauge.
Further, the stirring device of the mixing tank is a spiral stirrer.
Further, the mixing tank is provided with an observation window.
Further, the production device for stearic acid coated aluminum powder further comprises an aluminum powder discharging hopper and a stearic acid feeding hopper, wherein the aluminum powder discharging hopper and the stearic acid feeding hopper are respectively connected to the aluminum powder feeding port and the stearic acid feeding port of the mixing tank.
Further, the production device of stearic acid coated aluminum powder also comprises a nitrogen recovery device, and the nitrogen recovery device is used for recovering and recycling nitrogen in the production system.
And the mixing tank, the condenser, the negative pressure pumping device, the tail gas discharge pipe, the nitrogen supply device and the heat-conducting medium circulating device are electrically connected with the PLC control unit and used for realizing the automatic control of the production process. All valves of the whole production system are electromagnetic pneumatic butterfly valves, and all pumps and motors are started and stopped through program control. Except that the raw materials of aluminum powder and stearic acid are transported and the products are packed and transported by manual operation, other processes are controlled by inputting commands through a display screen of a PLC (programmable logic controller) in a central control room, and remote operation can be realized through a computer. The upper and lower limit values of the range are set by a program for parameters to be monitored, such as temperature, liquid level height and the like, once the limit values are reached, the system program can automatically control the start and stop of the system, if the nitrogen concentration in the production system is required, and once the limit values are exceeded, the system can automatically alarm.
According to another aspect of the present invention, there is also provided a production method for producing stearic acid-coated aluminum powder by using the above apparatus for producing stearic acid-coated aluminum powder, comprising the steps of:
1) inputting nitrogen into the mixing tank, so that air in the mixing tank is forcibly exchanged with the nitrogen, and stopping gas exchange after the content of the nitrogen detected at the tail gas discharge port meets the requirement;
2) adding a solvent, aluminum powder and stearic acid into a mixing tank with a clamping sleeve, and stirring and mixing;
3) keeping stirring, heating the materials in the mixing tank to ensure that all the stearic acid is dissolved, opening the negative pressure pumping device, keeping the negative pressure in the mixing tank to promote the solvent to evaporate, and condensing the evaporated solvent and then storing in a solvent storage tank;
4) and when the solvent in the mixing tank is about to be completely evaporated, stopping heating, introducing a cold medium into the jacket, continuously circulating the cold medium, cooling the materials in the mixing tank to normal temperature, discharging, and packaging to obtain the stearic acid coated aluminum powder product.
With the continuous evaporation and discharge of the solvent, the dried stearic acid-coated aluminum powder is finally remained in the tank body. Because the stirring state of the stirring device is kept all the time, the obtained product is in a full-dispersion state, and the stearic acid is used for completely and uniformly coating the aluminum powder, and free stearic acid and aluminum powder which cannot be coated are not generated.
Further, the content requirement of nitrogen detection at the tail gas discharge port in the step 1) is as follows: the nitrogen content is more than 92 percent.
Further, in the step 2), the adding the solvent, the aluminum powder and the stearic acid into the jacketed mixing tank is specifically performed by: part of the solvent is added first, then the aluminium powder and stearic acid are added, and then the rest of the solvent is added.
Further, in the step 2), the adding the solvent, the aluminum powder and the stearic acid into the jacketed mixing tank is specifically performed by: mixing part of the solvent and the aluminum powder in a ball mill, grinding the aluminum powder into flakes, adding the aluminum powder and the solvent into a mixing tank with a jacket, and then adding the stearic acid and the rest of the solvent. Firstly, grinding aluminum powder into flakes in a ball mill, and then coating stearic acid on the surfaces of the flakes to obtain a stearic acid-coated aluminum powder product.
Further, the adding amount of the stearic acid is 0.2-2% of the adding amount of the aluminum powder.
Further, the solvent is added in an amount that enables the aluminum powder to form a suspension slurry, and the specific addition amount can be adjusted according to the capacity of the mixing tank.
Further, the solvent is absolute ethyl alcohol.
Further, the heating mode in the step 3) is to input preheated heat conduction oil into a jacket of the mixing tank, circulate continuously, heat the mixture in the mixing tank to 70-85 ℃, keep the temperature for 5-20min, increase the temperature of the heat conduction oil after all the stearic acid in the mixing tank is dissolved, and continue to heat.
The invention has the following beneficial effects:
the production device for stearic acid coated aluminum powder is provided with the nitrogen supply device, and nitrogen is introduced before feeding to replace air in a production system formed by the whole production device, so that the contact between the aluminum powder and the air can be avoided, the potential safety hazard of explosion is eliminated, and the surface of the aluminum powder can be prevented from being oxidized by oxygen in the air; the mixing tank is provided with a jacket, and a heating evaporation mode of introducing heating oil into the jacket is adopted, so that uniform heating of all parts of the mixed solution is favorably ensured, the evaporation is balanced, and meanwhile, the drying is realized, and the coating layer of the product is ensured to be relatively uniform; meanwhile, when the heating evaporation is about to be finished, cold oil is introduced into the jacket for quenching, so that stearic acid can be completely solidified on the surface of the aluminum powder; the solvent recovery unit comprises a negative pressure pumping device, negative pressure evaporation is performed during evaporation, the solvent can be guaranteed to evaporate at a lower temperature, the stearic acid structure is prevented from being damaged, the solvent is recovered and recycled, the production cost can be greatly reduced, and industrial large-scale production is easy to realize.
The invention provides a production method of stearic acid coated aluminum powder, which comprises the steps of carrying out forced gas exchange of air and nitrogen on a production system before reaction materials are put into the production system, completely discharging the air in a mixing tank out of the system, then adding a solvent, aluminum powder and stearic acid, heating the reaction tank by introducing hot oil into a jacket after feeding is finished, heating and evaporating the materials in the mixing tank under a negative pressure state, introducing the evaporated solvent into a solvent recovery unit for condensation and recovery, introducing cold oil into the jacket for quenching at the moment of ending the evaporation until the temperature of a product in the mixing tank is reduced to normal temperature, and discharging to obtain a stearic acid coated aluminum powder product. The stearic acid of the aluminum powder product obtained by the production method of the invention is quite comprehensive and uniform in coating on the aluminum powder, and has no free stearic acid or aluminum powder which cannot be coated.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural view of a production apparatus for stearic acid-coated aluminum powder according to a preferred embodiment of the present invention;
illustration of the drawings:
1. a mixing tank; 2. a jacket; 3. aluminum powder feeding hopper; 4. a stearic acid feeding hopper; 5. a stirring device; 6. a condenser; 7. a solvent storage tank; 8. a negative pressure pumping device; 9. an oil storage tank; 10. an oil transfer pump; 11. a discharge gate valve; 12. a solvent delivery pump; 13. a tail gas discharge pipe; 14. a nitrogen supply device.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the accompanying drawings, but the invention can be embodied in many different forms, which are defined and covered by the following description.
Fig. 1 is a schematic structural view of a production apparatus for stearic acid-coated aluminum powder according to a preferred embodiment of the present invention.
As shown in fig. 1, the apparatus for producing stearic acid-coated aluminum powder of this embodiment includes a mixing tank 1 with a stirring device, a condenser 6, a solvent storage tank 7, a negative pressure pumping device 8, a tail gas discharge pipe 13 and a nitrogen supply device 14, the mixing tank 1, the condenser 6, the solvent storage tank 7 and the negative pressure pumping device 8 are sequentially connected by a pipeline, the mixing tank 1 is provided with a jacket 2, a heat conducting medium is introduced into the jacket 2 for heating or cooling the mixing tank 1, the tail gas discharge pipe 13 is connected with the negative pressure pumping device 8, and the nitrogen supply device 14 is connected with a nitrogen inlet of the mixing tank 1.
The production device of stearic acid cladding aluminium powder of this embodiment still includes heat-conducting medium circulating device, and heat-conducting medium circulating device includes oil storage tank 9 and oil transfer pump 10, and oil storage tank 9 passes through the pipeline and links to each other with the import and the export of pressing from both sides cover 2 respectively and forms circulation circuit, and oil transfer pump 10 sets up on heat-conducting oil pipeline. The oil storage tank 9 comprises a hot oil storage tank and a cold oil storage tank, and the oil transfer pump 10 comprises a hot oil transfer pump and a cold oil transfer pump.
The stearic acid-coated aluminum powder production device comprises an aluminum powder discharge hopper 3 and a stearic acid feeding hopper 4, wherein the aluminum powder discharge hopper 3 and the stearic acid feeding hopper 4 are respectively connected to an aluminum powder feeding port and a stearic acid feeding port of the mixing tank.
In this embodiment, all be equipped with the valve at the dog-house, discharge gate, the nitrogen gas inlet of blending tank, be equipped with solvent delivery pump 12 on the solvent conveying pipeline, the tail gas delivery pipe is equipped with the tail gas discharge valve, and the gas vent is equipped with gaseous detection device, is equipped with the temperature thermocouple in the blending tank, is equipped with the observation window on the blending tank jar body (not shown in the figure).
In this embodiment, the system further comprises a PLC controller (not shown in the figure), and the mixing tank 1, the condenser 6, the negative pressure pumping device 8, the tail gas discharge pipe 13, the nitrogen supply device 14, and the heat transfer medium circulating device are all electrically connected to the PLC control unit, so as to realize automatic control of the production process. All valves are electromagnetic pneumatic butterfly valves, and all pumps and motors are started and stopped through program control. The upper and lower limit values of the range are set by a program for parameters to be monitored, such as temperature, liquid level height and the like, once the limit values are reached, the system program can automatically control the start and stop of the system, if the nitrogen concentration in the production system is required, and once the limit values are exceeded, the system can automatically alarm.
Example 1
The production method for producing the stearic acid-coated aluminum powder by adopting the production device for producing the stearic acid-coated aluminum powder comprises the following steps:
1) closing all stages of valves communicated with the outside of the production device, only leaving a tail gas discharge port to open, opening a nitrogen gas supply valve, inputting nitrogen gas into the mixing tank, forcibly exchanging air and nitrogen gas in the production device, closing a nitrogen gas inlet valve after the detected content of the nitrogen gas in the tail gas discharge port meets the requirement (the content of the nitrogen gas is more than 92 percent), and stopping gas exchange;
2) open absolute ethyl alcohol delivery pump, through absolute ethyl alcohol pipeline, carry absolute ethyl alcohol to jar 1/3 height to the mixing tank 1 in, mixing tank 1 is equipped with the glass level gauge, can direct observation the internal liquid level condition of jar, close the ethanol delivery pump, send raw materials aluminium powder to the mixing tank by hydraulic elevator, open mixing tank agitating unit 5, make mixing impeller low-speed rotation (30 rotations to 60 rotations per minute), open the aluminium powder charge door at 1 top of mixing tank, add aluminium powder 40kg (notes) to the jar while stirring: the mixing tank is designed to be 100L, the capacity of the aluminum powder is about 100kg, when mixing is prevented, the mixed liquid splashes on the cover body of the mixing tank, the total amount of the mixed liquid is not more than 2/3 of the tank body, the rotating speed of a mixing impeller is not more than 180 r/min), 0.08kg of stearic acid is added from a stearic acid feeding hole according to the proportion of 0.2%, an ethanol conveying pump is started through observation of a liquid level meter, absolute ethyl alcohol is slowly added, and the height of the mixture in the tank is controlled to be 2/3.
3) Closing an ethanol delivery pump, opening a tail gas discharge valve, opening a hot oil delivery pump, inputting heat conduction oil preheated to 100 ℃ into a jacket 2 of a mixing tank body 1, continuously circulating, heating the mixture in the tank body to 70 ℃, stopping oil circulation, keeping the temperature at 70 ℃ for 20min, ensuring that stearic acid in the tank is completely dissolved, continuing oil circulation, increasing the temperature of the heat conduction oil to 120 ℃ through electric heating, and simultaneously opening a negative pressure pumping device 8 of a production device, keeping the negative pressure in a reaction system formed by the whole production device, and promoting the evaporation of ethanol. The stirring device is fully opened in the whole process, and the rotating speed is kept at 150-180 r/min, so that the concentration of each point of the dissolved stearic acid in the tank is kept consistent and the stearic acid is fully and uniformly mixed with the aluminum powder.
4) The tank body is heated by continuous heat conduction oil, the negative pressure device is continuously pumped to keep negative pressure in the production system, and evaporated ethanol steam is liquefied into liquid to drip and flow back to the solvent storage tank 7 due to cooling of condensate when passing through the condenser 6. The rest gas is discharged into the air through a tail gas discharge port under the action of the negative pressure pumping device 8. When the solvent in the mixing tank is about to be completely evaporated, the hot oil delivery pump is closed, the circulation of hot oil is stopped, and an oil discharge pipe valve below the jacket is opened, so that the hot oil in the jacket automatically flows back to the hot oil storage tank. And opening the cold oil delivery pump to enable the heat conduction oil maintaining the ambient temperature to enter the jacket and circulate continuously, so as to accelerate the product coated by the stearic acid in the tank to be cooled to the normal temperature. Stopping cold oil circulation, opening the discharge gate valve 11 at the lower part of the mixing tank, loading the product into a packaging barrel with a packaging bag, weighing, and tightening the opening of the bag to obtain the product.
With the continuous evaporation and discharge of the absolute ethyl alcohol, the dried stearic acid-coated aluminum powder is finally remained in the tank body. The stirring state of the stirrer is kept all the time, so that the obtained product is in a single-particle and full-dispersion state, and the stearic acid is used for completely and uniformly coating the aluminum powder, and has no free stearic acid or aluminum powder which cannot be coated.
In the embodiment, the starting and stopping of the feeding valves for the aluminum powder and the stearic acid are performed by manual touch operation, the nitrogen gas starts to be conveyed and is controlled by personnel, and once the nitrogen gas meets the set requirement, the gas supply is automatically stopped. The liquid level height, the temperature and the like in the mixing tank are set and automatically controlled through programs, namely after the stage of inputting nitrogen is reached, all the processes are automatically controlled through programs, including temperature holding time, negative pressure suction degree and the like, until the product is molded, dried and cooled, the valve is opened and closed through a manual key in the discharging process, and the packaging bag is bound manually.
The stearic acid-coated aluminum powder produced by the production device for stearic acid-coated aluminum powder has the stearic acid content as low as below 0.5%, the use performance of the aluminum powder is basically not influenced, and in dust emission detection, 95% of aluminum powder is kept in a qualified range, and suspended aluminum dust is not generated. In a boiling-resistant experiment, no air bubbles are generated when the water temperature reaches 90 ℃; in acid and alkali resistance experiments, in solutions with pH of 2 and pH of 8.5, no bubbles are generated when the water temperature reaches 70 ℃, and bubbles are generated when the water temperature is higher than 70 ℃, because stearic acid begins to melt after the water temperature is 70 ℃, and does not play a role in coating any more.
Example 2
The production method for producing the stearic acid-coated aluminum powder by adopting the production device for producing the stearic acid-coated aluminum powder comprises the following steps:
1) closing all stages of valves communicated with the outside of the production device, only leaving a tail gas discharge port to open, opening a nitrogen gas supply valve, inputting nitrogen gas into a mixing tank, forcibly exchanging air and nitrogen gas in the production system, closing a nitrogen gas inlet valve after the detected content of the nitrogen gas in the tail gas discharge port meets the requirement (the content of the nitrogen gas is more than 92 percent), and stopping gas exchange;
2) adding a proper amount of absolute ethyl alcohol and 40kg of aluminum powder into a ball mill, grinding the aluminum powder into flakes, inputting the aluminum powder and a solvent into a mixing tank 1 through a pipeline, opening a mixing tank stirring device 5, and enabling a mixing impeller to rotate at a low speed (30-60 revolutions per minute) (note: the mixing tank is designed to be 100L, the capacity of the aluminum powder is about 100kg, when mixing is prevented, the mixed liquid splashes on the cover body of the mixing tank, the total amount of the mixed liquid is not more than 2/3 of the tank body, the rotating speed of a mixing impeller is not more than 180 r/min), 0.8kg of stearic acid is added from a stearic acid feeding hole according to the proportion of 2%, an ethanol conveying pump is started through observation of a liquid level meter, absolute ethyl alcohol is slowly added, and the height of the mixture in the tank is controlled to be 2/3.
3) Closing an ethanol delivery pump, opening a tail gas discharge valve, opening a hot oil delivery pump, inputting heat conduction oil preheated to 100 ℃ into a jacket 2 of a mixing tank body 1, continuously circulating, heating the mixture in the tank body to 85 ℃, stopping oil circulation, keeping the temperature at 85 ℃ for 5min, ensuring that stearic acid in the tank is completely dissolved, continuing oil circulation, increasing the temperature of the heat conduction oil to 120 ℃ through electric heating, and simultaneously opening a negative pressure pumping device 8 of a production device, keeping the interior of a production system formed by the whole production device at a negative pressure, and promoting the evaporation of ethanol. The stirring device is fully opened in the whole process, and the rotating speed is kept at 150-180 r/min, so that the concentration of each point of the dissolved stearic acid in the tank is kept consistent and the stearic acid is fully and uniformly mixed with the aluminum powder.
4) The tank body is heated by continuous heat conduction oil, the negative pressure device is continuously pumped to keep negative pressure in the production system, and evaporated ethanol steam is liquefied into liquid to drip and flow back to the solvent storage tank 7 due to cooling of condensate when passing through the condenser 6. The rest gas is discharged into the air through a tail gas discharge port under the action of the negative pressure pumping device 8. When the solvent in the mixing tank is about to be completely evaporated, the hot oil delivery pump is closed, the circulation of hot oil is stopped, and an oil discharge pipe valve below the jacket is opened, so that the hot oil in the jacket automatically flows back to the hot oil storage tank. And opening the cold oil delivery pump to enable the heat conduction oil maintaining the ambient temperature to enter the jacket and circulate continuously, so as to accelerate the product coated by the stearic acid in the tank to be cooled to the normal temperature. Stopping cold oil circulation, opening a discharge butterfly valve at the lower part of the mixing tank, filling the product into a packaging barrel with a packaging bag, weighing, and tightening the opening of the bag to obtain the product.
With the continuous evaporation and discharge of the absolute ethyl alcohol, the dried stearic acid-coated aluminum powder is finally remained in the tank body. The stirring state of the stirrer is kept all the time, so that the obtained product is flaky and fully dispersed, and the stearic acid can completely and uniformly coat the aluminum powder, and has no free stearic acid or aluminum powder which cannot be coated.
In the embodiment, the starting and stopping of the feeding valves for the aluminum powder and the stearic acid are performed by manual touch operation, the nitrogen gas starts to be conveyed and is controlled by personnel, and once the nitrogen gas meets the set requirement, the gas supply is automatically stopped. The liquid level height, the temperature and the like in the mixing tank are set and automatically controlled through programs, namely after the stage of inputting nitrogen is reached, all the processes are automatically controlled through programs, including temperature holding time, negative pressure suction degree and the like, until the product is molded, dried and cooled, the valve is opened and closed through a manual key in the discharging process, and the packaging bag is bound manually.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A production method of stearic acid coated aluminum powder is characterized in that,
the adopted production device is characterized in that the device comprises a machine frame,
comprises a mixing tank (1) with a stirring device, a condenser (6), a solvent storage tank (7), a negative pressure pumping device (8), a tail gas discharge pipe (13) and a nitrogen supply device (14),
the mixing tank (1), the condenser (6), the solvent storage tank (7) and the negative pressure pumping device (8) are connected in sequence,
the mixing tank (1) is provided with a jacket (2), a heat conducting medium is introduced into the jacket (2) and used for heating or cooling the mixing tank (1),
the tail gas discharge pipe (13) is connected with the negative pressure pumping device (8),
the nitrogen supply device (14) is connected with a nitrogen inlet of the mixing tank (1);
the production device of the stearic acid coated aluminum powder also comprises a heat-conducting medium circulating device,
the heat-conducting medium circulating device comprises an oil storage tank (9) and an oil transfer pump (10), wherein the oil storage tank (9) is respectively connected with an inlet and an outlet of the jacket (2) to form a circulating loop, and the oil transfer pump (10) is arranged on a heat-conducting oil conveying pipeline;
the oil storage tank (9) comprises a hot oil storage tank and a cold oil storage tank, and the oil transfer pump (10) comprises a hot oil transfer pump and a cold oil transfer pump;
the production method of the stearic acid coated aluminum powder comprises the following steps:
1) inputting nitrogen into the mixing tank, so that air in the mixing tank is forcibly exchanged with the nitrogen, and stopping gas exchange after the content of the nitrogen detected at the tail gas discharge port meets the requirement;
2) adding a solvent, aluminum powder and stearic acid into a mixing tank with a clamping sleeve, and stirring and mixing;
3) keeping stirring, heating the materials in the mixing tank to completely dissolve stearic acid, opening the negative pressure pumping device, keeping the negative pressure in the mixing tank to promote the solvent to evaporate, and condensing the evaporated solvent and then storing in a solvent storage tank;
4) and when the solvent in the mixing tank is about to be completely evaporated, stopping heating, introducing a cold medium into the jacket, continuously circulating the cold medium, cooling the materials in the mixing tank to normal temperature, discharging, and packaging to obtain the stearic acid coated aluminum powder product.
2. The method for producing stearic acid-coated aluminum powder according to claim 1,
in the step 2), the adding of the solvent, the aluminum powder and the stearic acid into the mixing tank with the jacket is carried out by: part of the solvent is added first, then the aluminium powder and stearic acid are added, and then the rest of the solvent is added.
3. The method for producing stearic acid-coated aluminum powder according to claim 1,
in the step 2), the adding of the solvent, the aluminum powder and the stearic acid into the mixing tank with the jacket is carried out by: mixing part of the solvent and the aluminum powder in a ball mill, grinding the aluminum powder into flakes, adding the aluminum powder and the solvent into a mixing tank with a jacket, and then adding the stearic acid and the rest of the solvent.
4. The method for producing stearic acid-coated aluminum powder according to claim 1,
the nitrogen detection content requirement of the tail gas discharge port in the step 1) is as follows: the nitrogen content is more than 92 percent.
5. The method for producing stearic acid-coated aluminum powder according to claim 1,
the addition amount of the stearic acid is 0.2-2% of the addition amount of the aluminum powder.
6. The method for producing stearic acid-coated aluminum powder according to claim 1,
the solvent is absolute ethyl alcohol.
7. The method for producing stearic acid-coated aluminum powder according to claim 1,
the heating mode in the step 3) is to input preheated heat conduction oil into a jacket of the mixing tank, circulate continuously, heat the mixture in the mixing tank to 70-85 ℃, keep the temperature for 5-20min, increase the temperature of the heat conduction oil after the stearic acid in the mixing tank is completely dissolved, and continue to heat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811496831.7A CN109332682B (en) | 2018-12-07 | 2018-12-07 | Production device and production method of stearic acid coated aluminum powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811496831.7A CN109332682B (en) | 2018-12-07 | 2018-12-07 | Production device and production method of stearic acid coated aluminum powder |
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| Publication Number | Publication Date |
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| CN109332682A CN109332682A (en) | 2019-02-15 |
| CN109332682B true CN109332682B (en) | 2021-07-06 |
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