JP6335565B2 - Impact type grinding method and impact type grinding device - Google Patents

Description

  The present invention is an impact pulverization method in which a raw material to be pulverized is cooled with a liquefied inert gas, and the cooled raw material is pulverized by an impact pulverizer equipped with a rotary pulverization blade, and the impact pulverization thereof. The present invention relates to an impact pulverizer for carrying out the method.

Such an impact pulverization method can be pulverized satisfactorily with an impact pulverizer by cooling the raw material to be pulverized with a liquefied inert gas so that the raw material to be pulverized is easily pulverized by impact. It is what I did.
That is, as the raw material to be pulverized, various materials having a property of embrittlement at a low temperature and various materials having a property of glass transition at a low temperature can be used as a raw material to be pulverized. Biomaterials, synthetic resins, organic materials, metals, etc. that have embrittlement can be used as raw materials to be crushed, and rubbers, synthetic resins, etc. that have a glass transition property at low temperatures can be used as raw materials to be crushed. It can be.

In other words, if the raw material to be crushed has a property of embrittlement at a low temperature, the raw material is cooled to below the embrittlement point. By cooling below, it can be pulverized well with an impact pulverizer.
And when the raw material of grinding | pulverization is a granular form, such a granular raw material will be grind | pulverized and pulverized.

  As a conventional example of such an impact type pulverization method, liquid nitrogen is sprayed on the raw material to be pulverized, the raw material is cooled, and the cooled raw material is dropped and supplied to a hammer mill (impact type pulverizer) for pulverization. There are some (for example, refer to Patent Document 1).

  That is, in Patent Document 1, a crushed piece obtained by crushing a rubber molded product is used as a raw material to be crushed, and the raw material to be crushed is directed from an inlet at one end of a horizontal cylindrical chamber to an outlet at the other end. The raw material is cooled below the glass transition point by spraying liquid nitrogen on the raw material from a nozzle provided in the vicinity of the other end of the chamber, and the cooled raw material is discharged from the discharge port of the chamber. A hammer mill (impact pulverizer) is disposed to face the lower end of the other end of the chamber.

  Further, in Patent Document 1, the nitrogen gas vaporized after being sprayed from the nozzle is caused to flow toward the inlet of the chamber, and the raw material conveyed inside the chamber is directed toward the inlet of the chamber. The flowing nitrogen gas is also cooled, and the nitrogen gas discharged from the inlet side end of the chamber is introduced into a hammer mill (impact pulverizer), and by a hammer mill (impact pulverizer). It is described that the grinding is performed at a low temperature.

  Incidentally, although there is no specific description of the implementation method in Patent Document 1, the raw material discharged from the discharge port of the chamber is transferred to a hammer mill (impact pulverizer) with liquid nitrogen or nitrogen gas accompanied. In this case, it is described that it is not necessary to supply nitrogen gas discharged from the chamber to a hammer mill (impact pulverizer).

JP-A-11-156225

  The conventional impact pulverization method is to drop and supply the material to be crushed to an impact pulverizer and pulverize. Therefore, when the material to be pulverized is granular, the granular material is pulverized. Therefore, there is a possibility that fine pulverization cannot be performed properly.

  In other words, in order to pulverize the raw material, the pulverization blade is rotated at a high speed so that the impact force caused by the collision between the raw material and the pulverization blade of the impact pulverizer increases. Due to the wind pressure of the grinding blade rotating at high speed, the powdery raw material falling under its own weight flows to the side away from the grinding blade and may flow without colliding with the grinding blade. The powdery raw material cannot be pulverized properly to be pulverized, and improvement is desired.

This invention is made in view of the said actual condition, The objective is to provide the impact-type grinding | pulverization method which can grind | pulverize and pulverize a granular raw material appropriately.
Another object of the present invention is to provide an impact pulverizer capable of appropriately pulverizing and pulverizing a powdery raw material.

The impact pulverization method of the present invention is an impact pulverization method in which a raw material to be pulverized is cooled with a liquefied inert gas, and the cooled raw material is pulverized by an impact pulverizer equipped with a rotary pulverization blade. The first characteristic configuration is
The raw material and the liquefied inert gas are mixed, the raw material is cooled and a mixed liquid of the raw material and the liquefied inert gas is generated, and the generated mixed liquid is pulverized by the pulverization blades It injects in the pressurization state which increases an injection pressure toward the surface.

That is, the raw material is cooled by mixing with the liquefied inert gas, and the mixed liquid of the raw material and liquefied inert gas is injected toward the pulverization surface of the pulverization blade in a pressurized state that increases the injection pressure. As a result, the mixed liquid collides with the pulverization blade while flowing at high speed with the injection pressure.
As a result, due to the collision between the mixed solution and the pulverization blade, the raw material is impacted and the raw material is pulverized.

  In this way, since the raw material, the liquefied inert gas, and the mixed liquid are injected toward the pulverization surface of the pulverization blade in a pressurized state that increases the injection pressure, the raw material to be pulverized is granular. However, the pulverization blade that rotates at a high speed because the mixed liquid flows at a high speed with a pressurized injection pressure and the mass of the mixed liquid of the raw material and the liquefied inert gas is larger than that of the raw material alone. Because it can overcome the wind pressure of the mixture and cause the mixed liquid to collide with the pulverization blades accurately, the collision between the mixed liquid and the pulverization blades impacts the powdery raw material and pulverizes the powdery raw material to produce fine powder. Can be

  Moreover, since the mixed liquid collides with the pulverizing blade rotating at a high speed while flowing at a high speed with a pressurized jet pressure, the impact force due to the collision increases, so the collision between the mixed liquid and the pulverizing blade occurs. Thus, a large impact force can be applied to the powdery raw material, and the powdery raw material can be appropriately pulverized.

  In short, according to the first characteristic configuration of the impact pulverization method of the present invention, it is possible to appropriately pulverize and pulverize the powdery raw material.

In addition to the first characteristic configuration described above, the second characteristic configuration of the impact pulverization method of the present invention includes:
The mixed liquid is intermittently ejected in a droplet state.

  That is, by intermittently ejecting the liquid mixture in the droplet state, the liquid mixture in the liquid droplet state is crushed while colliding with the pulverization blade without being affected by the other liquid mixture. The target raw material can be pulverized more appropriately.

  When the explanation is added, if the liquid mixture is continuously jetted in a linear flow state, the liquid mixture part that collided with the pulverization blades of the liquid mixture will fly (bounce) along with the collision. Among the mixed liquids in a linear flow state, the mixed liquid part that does not collide properly with the pulverization blade is included in the mixed liquid solution in a linear flow state because the mixed liquid part following the mixed liquid part that has collided is prevented from flowing toward the pulverization blade. There is a possibility that the raw material to be pulverized cannot be appropriately pulverized due to the tendency to occur.

  On the other hand, when the liquid mixture is intermittently ejected in the liquid droplet state, each liquid mixture in the liquid droplet state is a liquid mixture in the liquid droplet state that first collides with the pulverization blade and scatters. Since it will collide with a grinding | pulverization blade | wing accurately, without preventing a flow, the raw material of grinding | pulverization object can be pulverized more appropriately.

  In short, according to the second characteristic configuration of the impact pulverization method of the present invention, in addition to the operational effect of the first characteristic configuration of the impact pulverization method described above, the raw material to be pulverized can be more appropriately pulverized.

The impact type pulverization apparatus of the present invention cools a raw material to be crushed with a liquefied inert gas, and pulverizes the cooled raw material with an impact pulverizer equipped with a rotary pulverization blade, The first characteristic configuration is
Mixing the raw material and the liquefied inert gas, cooling the raw material and generating a mixed liquid of the raw material and the liquefied inert gas, and the pulverized blade The spray nozzle which injects toward the grinding | pulverization action surface, and the pressurization part which increases the injection pressure of the said liquid mixture injected from the said injection nozzle are provided.

  That is, the first characteristic configuration of the impact pulverization apparatus of the present invention is provided with a configuration for implementing the first characteristic configuration of the above-described impact pulverization method. The same operational effects as the operational effects described in the column are obtained.

That is, while the raw material is cooled in the mixed liquid generation unit, a mixed liquid of the raw material and the liquefied inert gas is generated, and the generated mixed liquid is pressurized so as to increase the injection pressure in the pressurization unit. In this state, it is sprayed from the spray nozzle toward the grinding action surface of the grinding blade and collides with the grinding blade while flowing at high speed.
As a result, due to the collision between the mixed solution and the pulverization blade, the raw material is impacted and the raw material is pulverized.

  In this way, since the raw material, the liquefied inert gas, and the mixed liquid are injected toward the pulverization surface of the pulverization blade in a pressurized state that increases the injection pressure, the raw material to be pulverized is granular. However, the pulverization blade that rotates at a high speed because the mixed liquid flows at a high speed with a pressurized injection pressure and the mass of the mixed liquid of the raw material and the liquefied inert gas is larger than that of the raw material alone. Because it can overcome the wind pressure of the mixture and cause the mixed liquid to collide with the pulverization blades accurately, the collision between the mixed liquid and the pulverization blades impacts the powdery raw material and pulverizes the powdery raw material to produce fine powder. Can be

  Moreover, since the mixed liquid is jetted at a pressurized jet pressure and collides with the pulverization blade while flowing at a high speed, the impact force due to the collision increases, so the collision between the mixed liquid and the pulverization blade causes Therefore, it becomes possible to give a large impact force to the powdery raw material, and the powdery raw material can be appropriately pulverized.

  In short, according to the first characteristic configuration of the impact pulverizer of the present invention, it is possible to appropriately pulverize and pulverize the powdery raw material.

The second characteristic configuration of the impact pulverization apparatus of the present invention is in addition to the first characteristic configuration of the impact pulverization apparatus described above,
An open / close section that opens and closes a mixed liquid supply path for supplying the mixed liquid generated in the mixed liquid generation section to the injection nozzle is provided in an intermittently opened and closed state, and the mixed liquid is in a droplet state. It is characterized by being comprised so that it may inject intermittently.

  That is, the second characteristic configuration of the impact pulverization apparatus of the present invention is provided with a configuration for implementing the second characteristic configuration of the above-described impact pulverization method. The same operational effects as the operational effects described in the column are obtained.

  That is, the open / close unit that opens and closes the mixed liquid supply path for supplying the mixed liquid generated by the mixed liquid generation unit to the injection nozzle is intermittently opened and closed, so that the mixed liquid is intermittently in a droplet state. Since each of the liquid mixture in the droplet state will be ejected, the liquid mixture in the liquid droplet state that collides with the pulverization blade and then scatters will not interfere with the flow, and will accurately collide with the pulverization blade. Therefore, the raw material to be pulverized can be pulverized more appropriately.

  In short, according to the second characteristic configuration of the impact pulverizing apparatus of the present invention, in addition to the operational effects of the first characteristic configuration of the impact pulverizing apparatus described above, the raw material to be pulverized can be more appropriately pulverized.

The third characteristic configuration of the impact pulverization apparatus of the present invention is in addition to the first or second characteristic configuration of the impact pulverization apparatus described above,
The impact pulverizer casing is supported in a state where the pulverization blade rotates about a horizontal axis,
The injection nozzle is disposed at an upper side portion of the casing,
A pulverized material discharge port is formed at a lower portion of the casing.

  That is, since the injection nozzle is arranged at the upper side portion of the casing that is supported in a state where the pulverization blades rotate around the horizontal axis, the pulverized material discharge port is formed at the lower side portion of the casing. In the upper part of the pulverized material, the pulverized raw material (pulverized product) pulverized by the collision between the mixed liquid and the pulverizing blades flows downward as the pulverizing blades rotate, Since the material is discharged to the outside, the raw material can be pulverized continuously and satisfactorily.

In addition, all or most of the liquefied inert gas in the mixed liquid is vaporized by the thermal energy generated when the mixed liquid collides with the pulverization blades, and is discharged as an inert gas from the pulverized product outlet to the outside of the casing. Therefore, the pulverized raw material (crushed material) discharged from the pulverized material discharge port is in a dry state.
In other words, since the pulverized raw material (pulverized product) is discharged from the pulverized product discharge port in a dry state, the pulverized raw material (pulverized product) must be separately dried. And can be recovered efficiently.

  In short, the third characteristic configuration of the impact pulverization apparatus of the present invention is capable of continuously and satisfactorily pulverizing the raw material in addition to the operational effects of the first or second characteristic configuration of the impact pulverization apparatus described above. Moreover, the pulverized raw material (ground product) can be efficiently recovered.

In addition to any of the first to third characteristic configurations of the impact-type crushing apparatus described above, the fourth characteristic configuration of the impact-type crushing apparatus of the present invention includes:
The spray nozzle and the impact pulverizer are provided in a high-pressure vessel having a pressure higher than atmospheric pressure.

  That is, since the injection nozzle and the impact type pulverizer are provided in a high-pressure vessel having a pressure higher than atmospheric pressure, the mixed liquid injected from the injection nozzle is pulverized while maintaining the liquid state of the liquefied inert gas. Therefore, the liquid mixture and the pulverization blade can collide appropriately.

  That is, when the injection nozzle and the impact type pulverizer are installed in the atmosphere, the liquefied inert gas of the mixed liquid injected from the injection nozzle is easily vaporized, but the high-pressure vessel having a pressure higher than the atmospheric pressure. By providing an injection nozzle and an impact pulverizer inside, the liquefied inert gas of the liquid mixture injected from the injection nozzle can be prevented from vaporizing, and the collision between the liquid mixture and the pulverization blade can be accurately performed as appropriate. Can be done.

  By the way, the pressure in the high-pressure vessel is set to a pressure that allows the liquefied inert gas of the mixed solution to be vaporized by the thermal energy caused by the mixed solution colliding with the pulverization blade. By setting the pressure, the pulverized raw material (crushed material) discharged from the impact pulverizer can be dried.

  In short, the fourth characteristic configuration of the impact pulverization apparatus according to the present invention, in addition to any one of the first to third characteristic configurations of the impact pulverization apparatus described above, accurately and appropriately matches the collision between the mixed liquid and the pulverization blades. Can be done.

The figure which shows the structure of the impact type grinding | pulverization apparatus of 1st Embodiment. Front view of grinding blade Side view of grinding blade The figure which shows the structure of the impact-type grinding | pulverization apparatus of 2nd Embodiment.

[First Embodiment]
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.
(Overall configuration of impact crusher)
As shown in FIG. 1, the impact pulverizer cools a raw material to be pulverized with liquid nitrogen as a liquefied inert gas, and applies the cooled raw material to an impact pulverizer F equipped with a rotary pulverization blade 1. A mixed liquid generating unit G that mixes the raw material to be pulverized and liquid nitrogen, cools the raw material and generates a mixed liquid of the raw material and liquid nitrogen, and the generated mixed liquid. An injection nozzle 2 that injects toward the pulverization action surface B (see FIG. 2) of the pulverization blade 1 and a pressurizing pump 3 as a pressurizing unit that increases the injection pressure of the liquid mixture injected from the injection nozzle 2 are provided. ing.

  That is, the impact pulverizer mixes the raw material to be pulverized with liquid nitrogen, cools the raw material, generates a mixed liquid of the raw material and liquid nitrogen, and converts the generated mixed liquid into the pulverized blade 1. An impact-type pulverization method is performed in which the material to be pulverized is pulverized by the impact force generated by the collision between the mixed liquid and the pulverization blade 1 toward the pulverization working surface B in a pressurized state. It is configured.

In the present embodiment, the raw material to be crushed is a material having a property of embrittlement at a low temperature, for example, a biomaterial, a synthetic resin, an organic material, a metal, and the like, and the raw material is cooled below the embrittlement point by liquid nitrogen. It is configured as follows.
Moreover, the raw material to be pulverized is in a granular form, and such a granular raw material is pulverized to be pulverized.
Metals that become brittle at low temperatures are iron (Fe), vanadium (V), chromium (Cr), rubidium (Rb), molybdenum (Mo), tantalum (Ta), tungsten (W), ferritic steel, etc. is there.

In the present embodiment, the mixed liquid supply valve 5 serving as an opening / closing unit that opens and closes the mixed liquid supply path 4 that supplies the mixed liquid generated by the mixed liquid generating unit G to the injection nozzle 2 is provided as the valve operation control unit 6. The liquid mixture is intermittently opened and closed, and the liquid mixture is ejected intermittently in a droplet state.
That is, as shown in FIGS. 2 and 3, the liquid mixture M in a droplet state flows toward the pulverization blade 1, collides with the pulverization blade 1, and pulverizes the raw material to be pulverized. ing.

  Further, in the present embodiment, the injection nozzle 2 and the impact pulverizer F are provided inside the high-pressure vessel J having a pressure higher than the atmospheric pressure, and vaporize the liquid nitrogen of the liquid mixture injected from the injection nozzle 2. The liquid mixture is made to collide with the pulverization blade 1 while being suppressed and accurately maintaining the liquid state of the liquid mixture.

(Configuration of mixed liquid generator)
As shown in FIG. 1, the mixed liquid generating unit G is configured to include a mixing container 7 in which a raw material can be input through an openable / closable upper wall 7 u and liquid nitrogen is supplied through a nitrogen supply path 8. Yes.
A stirring blade 9 for stirring the charged raw material and liquid nitrogen is provided inside the mixing container 7, and nitrogen gas vaporized inside the mixing container 7 is discharged to the outside above the mixing container 7. An outside air communicating cylinder 10 is provided for this purpose.

The nitrogen supply path 8 introduces liquid nitrogen delivered from a liquid nitrogen supply source such as a liquid nitrogen cylinder. In this embodiment, the liquid is, for example, −200 ° C. and 1 MPa (N / mm ² ). Nitrogen is introduced into the mixing container 7 through the nitrogen supply path 8.
Further, the nitrogen supply path 8 is provided with a nitrogen supply valve 8A so that the supply of nitrogen to the mixing container 7 can be interrupted.

  Accordingly, the raw material is charged into the mixing container 7 and liquid nitrogen is supplied through the nitrogen supply path 8, and the charged raw material and liquid nitrogen are stirred by the stirring blade 9, so that the charged raw material is brittle by the liquid nitrogen. It is configured to be cooled below the conversion point and to produce a mixed liquid of the raw material and liquid nitrogen.

  And as above-mentioned, the produced | generated liquid mixture is pressurized with the pressurization pump 3, an injection pressure is increased, and it becomes a droplet state by intermittent opening and closing of the liquid mixture supply valve 5, From the injection nozzle 2, it is comprised so that it may inject toward the crushing action surface B of the crushing blade | wing 1. FIG.

(Configuration of impact crusher)
As shown in FIG. 1, the impact pulverizer F is configured to support the pulverization blades 1 inside the casing 11 in a state of rotating around the horizontal axis, and an injection is performed on the upper side portion of the casing 11. The nozzle 2 is disposed, and a pulverized material discharge port 12 is formed at a lower portion of the casing 11.

  As shown in FIGS. 2 and 3, the pulverization blade 1 includes a disc-shaped rotating base 1A supported on the casing 11 so as to be rotatable around a horizontal axis, and an appropriate interval along the circumferential direction of the rotating base 1A. And a plate-like crushing action portion 1B mounted on the rotary base 1A in a state of being arranged in a row.

The rotating shaft 1a provided at the center of the rotating base 1A is driven and rotated by an electric motor (not shown), so that the grinding blade 1 is driven to rotate around the horizontal axis. ing.
Incidentally, the crushing action surface B of the crushing blade 1 is a face located on the lower side in the rotational direction of the crushing action part 1B.

As shown in FIG. 1, the lower portion of the casing 11 is formed in a funnel shape, and is configured to guide and flow the pulverized raw material (crushed material) toward the pulverized material discharge port 12.
Below the pulverized material discharge port 12, a pulverized material guide tube 13 for guiding the pulverized raw material (crushed material) to the outside of the high-pressure vessel J is provided in a state of penetrating the lower wall of the high-pressure vessel J. The pulverized raw material (crushed material) that flows along the crushed material guide cylinder 13 is collected in the crushed material collection container 14.

  A funnel-shaped receiving portion 13A at the top of the pulverized material guide cylinder 13 is arranged in a state of forming a nitrogen gas discharge passage between the pulverized material discharge tube 12 and a high-pressure container is provided in the middle of the pulverized material guide tube 13 A rotary discharge valve 15 having a sealing function for preventing the flow of nitrogen gas filling J is provided.

That is, the liquid nitrogen of the liquid mixture injected from the injection nozzle 2 is vaporized by being heated by the heat energy generated when the liquid mixture collides with the pulverization blade 1, and the vaporized nitrogen gas is pulverized. It flows from the material discharge port 12 to the inside of the high-pressure vessel J.
Then, the pulverized raw material (crushed material) discharged from the pulverized material discharge port 12 is collected in the crushed material collection container 14 while being guided by the crushed material guide cylinder 13.

(Configuration of high-pressure vessel)
The inside of the high-pressure vessel J is filled with nitrogen gas generated by vaporization of liquid nitrogen of the mixed liquid, and the high pressure higher than the atmospheric pressure is maintained by filling with the nitrogen gas. Will be.

  The high-pressure vessel J includes a high-pressure vessel pressure gauge 16 that measures the internal pressure of the high-pressure vessel J, and a high-pressure vessel pressure whose opening degree is automatically adjusted based on the detection result of the high-pressure vessel pressure gauge 16. An adjustment valve 17 is provided, and the opening degree of the high pressure vessel pressure adjustment valve 17 is automatically adjusted based on the detection result of the high pressure vessel pressure gauge 16 in order to maintain the internal pressure of the high pressure vessel J at a set high pressure. It is configured as follows.

The set high pressure of the high-pressure vessel J is a pressure for suppressing the vaporization of liquid nitrogen in the mixed liquid ejected from the ejection nozzle 2, for example, a pressure of about 0.2 to 0.3 MPa (N / mm ² ). Will be set to.

  As described above, the impact pulverization apparatus of the present embodiment mixes the raw material to be pulverized with liquid nitrogen, cools it below the embrittlement point, and converts the mixed liquid of the raw material to be crushed and liquid nitrogen into the pulverization blade 1 Since the material to be pulverized is pulverized by the impact force caused by the collision between the mixed liquid and the pulverization blade 1, the pulverization target surface B is injected in a pressurized state to increase the injection pressure. The raw material can be pulverized and finely pulverized.

  Further, the liquid mixture of the raw material to be pulverized and liquid nitrogen is intermittently ejected in a droplet state, and the liquid mixture M in the droplet state is applied to the pulverization blade 1 as shown in FIGS. Since the raw material to be pulverized is crushed by collision, the raw material to be pulverized is accurately pulverized while each liquid mixture M in the droplet state accurately collides with the pulverization blade 1. be able to.

[Second Embodiment]
Next, a second embodiment will be described. This second embodiment shows another embodiment of the mixed liquid generating unit G, and the other configuration is the same as that of the first embodiment. Only parts different from the first embodiment will be described, and the same configurations as those of the first embodiment will be denoted by the same reference numerals as those of the first embodiment, and detailed description thereof will be omitted.

As shown in FIG. 4, the raw material supply path 20 is provided in a state of penetrating the upper wall 7 u of the mixing container 7, and the raw material supply path 20 is provided with a raw material supply valve 20 </ b> A to supply the raw material to the mixing container 7. It is comprised so that supply of can be interrupted.
And it is comprised so that the mixing container 7 may be in the airtight state by closing the nitrogen supply valve 8A and the raw material supply path 20 provided in the nitrogen supply path 8.

  The mixing container 7 includes a mixing container pressure gauge 21 for measuring the internal pressure of the mixing container 7, and a mixing container pressure adjusting valve whose opening degree is automatically adjusted based on the detection result of the mixing container pressure gauge 21. 22 is provided so that the opening degree of the mixing container pressure regulating valve 22 is automatically adjusted based on the detection result of the mixing container pressure gauge 21 in order to maintain the internal pressure of the mixing container 7 at the set pressure. Has been.

The set pressure of the mixing container 7 is a pressure for suppressing vaporization of liquid nitrogen supplied from the nitrogen supply path 8 and is set to a pressure of about 0.2 to 0.3 MPa (N / mm ² ), for example. Will be.
Incidentally, since the pressure of the mixing container 7 is maintained at a high pressure, the increase amount of the injection pressure that is increased by the pressurizing pump 3 can be reduced as compared with the first embodiment.

[Another embodiment]
Next, another embodiment is listed.
(1) In the first and second embodiments, the case where liquid nitrogen is used as the liquefied inert gas is exemplified. However, for example, other liquefied inert gases such as liquid helium, liquid argon, and liquid carbon dioxide are used. It may be used.

(2) In the first and second embodiments, the powdery raw material to be pulverized is exemplified as a powder of a material having a property of embrittlement at a low temperature. As a raw material, a powdery material such as rubber or synthetic resin having a glass transition property at a low temperature can be used as a raw material to be crushed.

(3) In the first and second embodiments, the case where the injection nozzle 2 and the impact pulverizer F are provided inside the high-pressure vessel J having a pressure higher than the atmospheric pressure is illustrated, but the high-pressure vessel J is omitted. In other words, in other words, the spray nozzle 2 and the impact pulverizer F may be installed in the atmosphere.

(4) In the first and second embodiments, the case where the mixed liquid generating unit G puts the raw material and liquid nitrogen into the mixing container 7 and stirs inside the mixing container 7 is exemplified. The specific configuration of the mixed liquid generating unit G can be variously changed, for example, by mixing the raw material into the flow path through which liquid nitrogen flows.

DESCRIPTION OF SYMBOLS 1 Crushing blade 2 Injection nozzle 3 Pressurization part 4 Mixed liquid supply path 11 Casing 12 Crushed material discharge port 5 Opening and closing part B Crushing action surface F Impact type grinder G Mixed liquid production part J High pressure vessel

Claims (6)

An impact pulverization method in which a raw material to be pulverized is cooled with a liquefied inert gas, and the cooled raw material is pulverized by an impact pulverizer equipped with a rotary pulverization blade,
The raw material and the liquefied inert gas are mixed, the raw material is cooled and a mixed liquid of the raw material and the liquefied inert gas is generated, and the generated mixed liquid is pulverized by the pulverization blades An impact-type pulverization method characterized by spraying in a pressurized state to increase the spray pressure toward the surface.   2. The impact pulverization method according to claim 1, wherein the mixed liquid is intermittently ejected in a droplet state. An impact pulverization apparatus that cools a raw material to be crushed with a liquefied inert gas and pulverizes the cooled raw material with an impact pulverizer equipped with a rotary pulverization blade,
Mixing the raw material and the liquefied inert gas, cooling the raw material and generating a mixed liquid of the raw material and the liquefied inert gas, and the pulverized blade An impact-type crushing apparatus provided with an injection nozzle that injects toward the crushing action surface and a pressurizing unit that increases the injection pressure of the mixed liquid injected from the injection nozzle.   An open / close section that opens and closes a mixed liquid supply path for supplying the mixed liquid generated in the mixed liquid generation section to the injection nozzle is provided in an intermittently opened and closed state, and the mixed liquid is in a droplet state. 4. An impact pulverizing apparatus according to claim 3, wherein the pulverizing apparatus is configured to intermittently inject. The impact pulverizer casing is supported in a state where the pulverization blade rotates about a horizontal axis,
The injection nozzle is disposed at an upper side portion of the casing,
The impact type pulverizer according to claim 3 or 4, wherein a pulverized product discharge port is formed at a lower portion of the casing.   The impact type pulverizer according to any one of claims 3 to 5, wherein the spray nozzle and the impact type pulverizer are provided in a high-pressure vessel having a pressure higher than atmospheric pressure.

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