WO2023240888A1

WO2023240888A1 - Reaction device for water replenishing and reusing of inorganic core sand and reusing method

Info

Publication number: WO2023240888A1
Application number: PCT/CN2022/128173
Authority: WO
Inventors: 杨林龙; 叶健松; 孙磊磊
Original assignee: 苏州明志科技股份有限公司
Priority date: 2022-06-14
Filing date: 2022-10-28
Publication date: 2023-12-21
Also published as: CN114985675A; DE212022000104U1

Abstract

Provided are a reaction device for water replenishing and reusing of inorganic core sand and a reusing method. The reaction device comprises a reaction barrel (1), a water adding device (3), a heating device and a driving device (2), wherein the heating device is arranged at the bottom of the reaction barrel (1); the water adding device (3) supplies water to the interior of the reaction barrel (1); and the driving device (2) is configured to drive the reaction barrel (1) to rotate. The reusing method is carried out by using the reaction device for water replenishing and reusing of inorganic core sand.

Description

Reaction device and reuse method for rehydrating and reusing inorganic core sand

This application claims priority from the Chinese patent application with the filing date of June 14, 2022 and the application number 202210669853.9. The entire content of this application is incorporated into this application by reference.

Technical field

The present application relates to the technical field of foundry sand, for example, to a reaction device and a reuse method for water replenishment and reuse of inorganic core sand.

Background technique

In terms of casting, inorganic binders have the advantages of being green, environmentally friendly and pollution-free. However, when inorganic core sand (sand mixed with inorganic binder and foundry sand) is exposed to the air and comes into contact with the air, the inorganic binder will undergo a dehydration and condensation reaction, adhering the sand grains together, gradually spreading to the center, and solidifying. shell. Cause inorganic core sand to fail.

In related technologies, the treatment method for failed inorganic core sand is to use mechanical method, wet method, combination of mechanical method and wet method, combination of mechanical method and thermal method, or combination of thermal method and wet method to inorganic core sand. regeneration.

Related art discloses an inorganic sand regeneration method and inorganic regenerated sand. The regeneration method includes the following steps: (1) First mechanical regeneration: crush the old inorganic sand to obtain primary mechanical regeneration sand; (2) Thermal regeneration Method regeneration: heat the primary mechanically regenerated sand to obtain thermally regenerated sand; (3) second mechanical regeneration: mechanically grind the thermally regenerated sand to obtain secondary mechanically regenerated sand; (4) grind the second mechanically regenerated sand The crushed impurities in the mechanically regenerated sand are removed to obtain the inorganic regenerated sand.

Related art also discloses an inorganic sand regeneration method, which includes the following steps: (1) mechanically crush the old inorganic sand to a particle size of less than 6 mm, and sieve to obtain sand A; (2) roast the sand A. Boiling roasting is carried out in the furnace, and then it enters the stew area and continues roasting to obtain sand B; (3) Sand B is mechanically ground at 250-350°C, cooled, and the ground fine powder is removed by induced air. The remaining heat is recovered for boiling roasting to obtain sand C; (4) Add water to sand C, mix and stir, then separate and recycle the water, dry and cool to obtain inorganic regenerated sand.

Related art also discloses an inorganic sand regeneration process, which includes the following steps: (1) the old sand is lifted to the batching machine through the storage box, and then transferred to the crusher after batching; (2) the crusher After the sand is crushed, it is screened through a screening machine and the dust is removed through the dust removal system; (3) The sand after dust removal enters the aeration and dissolution washing tank for two-stage aeration and dissolution and washing; (4) After being washed with air and water, it enters The aeration sand cleaning tank performs two-stage aeration cleaning to clean the glue liquid attached to the surface of the sand to make the sand surface clean; (5) The cleaned sand in step (4) is transported to the tubular separator and bed filter. Separate sand and water twice; (6) The dehydrated sand is transported to the dryer through a belt conveyor, and then transported to the finished product warehouse for use after drying.

Related art also discloses an inorganic sand regeneration method and inorganic regenerated sand. The inorganic sand regeneration method includes the following steps: (1) First mechanical regeneration: crush the old inorganic sand to obtain primary mechanical regeneration sand; ( 2) Thermal regeneration: heat the primary mechanically regenerated sand to obtain thermally regenerated sand; (3) Second mechanical regeneration: mechanically grind the thermally regenerated sand to obtain secondary mechanically regenerated sand; (4) The crushed impurities in the secondary mechanically regenerated sand are removed to obtain the inorganic regenerated sand.

Although the inorganic sand regeneration methods in the above related technologies all disclose the treatment of the expired inorganic core sand, the disclosed methods and the regenerated inorganic core sand destroy the reagents on the surface of the original inorganic core sand before reuse. It needs to be coated with inorganic binder again, which affects the reuse of inorganic core sand.

To sum up, there is provided a method for performing a water-absorbing reaction on incompletely solidified inorganic core sand to separate the adhered core sand and achieve a state similar to that of freshly mixed core sand, which can continue to be used for core making and avoid waste of core sand. Reuse methods are one of the problems that urgently need to be solved in this field.

Contents of the invention

This application provides a reaction device and a reuse method for rehydrating and reusing inorganic core sand, which can restore the performance of failed inorganic core sand before using it, avoid the waste of binders and additives, and can also achieve Long-term storage of inorganic core sand.

In the first aspect, an embodiment of the present application provides a reaction device for replenishing water and reusing inorganic core sand. The reaction device includes a reaction barrel, a water adding device, a heating device and a driving device. The heating device is disposed on the At the bottom of the reaction barrel, the water adding device provides moisture inside the reaction barrel, and the driving device is configured to drive the rotation of the reaction barrel.

In a second aspect, an embodiment of the present application provides a method for reusing inorganic core sand using the reaction device for rehydrating and reusing inorganic core sand provided in the first aspect.

Description of the drawings

Figure 1 is a schematic structural diagram of a reaction device for rehydrating and reusing inorganic core sand provided in Embodiment 1 of the present application;

Figure 2 is a schematic diagram of the specific components of the reaction device for rehydration and reuse of inorganic core sand provided in Embodiment 1 of the present application;

Figure 3 is a schematic diagram of the sealing cover provided in Embodiment 1 of the present application;

Figure 4 is a schematic diagram of a spiral drive provided by Embodiment 1 of the present application;

Figure 5 is a schematic diagram of some components of the reaction device provided in Embodiment 1 of the present application.

Among them, 1. Reaction barrel, 11. Sealing cover; 2. Driving device, 2-1, motor, 2-2, gear, 2-3, roller, 2-4, spiral drive, 2-5, spiral blade, 3. Water adding device, 3-1, water pump, 3-2, water pipe, 3-3, atomization device, 3-4, inorganic core sand moisture content detection device, 4 is the sand discharge plate, 5 is the support device, 6-1 is the heating plate, 6-2 is the outer frame, 7 is the control switch, and 8 is the reaction barrel limiter.

Detailed ways

In order to demonstrate the effectiveness of the reuse method described in this application, the inorganic core sand processed by the specific implementation method of this application is the same inorganic core sand. The preparation method of the inorganic core sand is as follows:

Add 8kg of silica sand to the sand mixer, then add 68g of additives, and then add 160g of inorganic binder. After mixing, inorganic core sand is obtained.

Embodiment 1

This embodiment provides a reaction device for replenishing water and reusing inorganic core sand as shown in Figures 1 to 5. The reaction device for replenishing water and reusing inorganic core sand includes a reaction barrel 1 and a heating device. , driving device 2 and water adding device 3; the heating device is arranged at the bottom of the reaction barrel 1; the driving device 2 is arranged to drive the reaction barrel 1 to rotate; the water adding device 3 is arranged to move inside the reaction barrel 1 Add appropriate amount of water.

The heating device includes a heating plate 6-1 and an outer frame 6-2; the outer frame 6-2 is configured to fix the heating plate 6-1; the heating plate 6-1 is an electromagnetic heating plate.

The heating plate 6-1 provided in this embodiment uses electromagnetic heating, which can be intelligently adjusted according to the temperature detected by the temperature sensor, or can also use resistance heating. This embodiment does not limit the material selection of the heating plate, as long as it can provide heat to the reaction barrel 1, it can be used.

The driving device 2 includes a roller drive and a screw drive 2-4; the roller drive includes a motor 2-1, a gear 2-2 and a roller 2-3 arranged in sequence; the roller 2-3 A rubber layer is provided on the surface.

The purpose of providing the rubber layer on the surface of the roller 2-3 provided in this embodiment is to increase the friction coefficient between the reaction barrel 1 and the roller 2-3, and drive the rotation of the reaction barrel 1 through friction.

In the roller drive provided in this embodiment, the motor 2-1 drives the gear 2-2 to rotate, and then drives the roller 2-3 to rotate. The contact surface between the reaction barrel 1 and the roller 2-3 has a large friction coefficient. The large friction force drives the reaction barrel 1 to rotate, causing the sand inside the reaction barrel 1 to roll up and down to achieve a stirring effect.

As shown in FIG. 4 , the spiral drive 2 - 4 includes a spiral blade 2 - 5 , and the spiral blade 2 - 5 is arranged inside the reaction barrel 1 . If the roller 2-3 drive fails and cannot be realized, the screw drive 2-4 can also achieve the stirring effect of the inorganic core sand inside the reaction barrel 1.

As shown in Figure 3, one end of the reaction barrel 1 is provided with a sealing cover 11. The purpose of the sealing cover 11 provided in this embodiment is to ensure that the reaction barrel 1 maintains a closed environment during the sand mixing process and ensures the progress of the water absorption reaction. .

The reaction barrel 1 also includes a sand discharge guide plate 4; the sand discharge guide plate 4 is arranged on the side close to the sealing cover 11. The sand guide plate 4 described in this embodiment is configured to collect the inorganic core sand after the reaction. When taking out sand, the sand in the reaction barrel 1 slides down along the sand discharge guide plate 4, which facilitates collection and saves manpower.

As shown in Figures 2 and 5, the water adding device 3 includes a water pump 3-1 and a water delivery pipe 3-2 connected in sequence; the outlet of the water delivery pipe 3-2 is provided inside the reaction barrel 1; An atomizing device 3-3 is provided at the outlet of the water pipe 3-2.

The reaction device also includes a support device 5, a control switch 7 and a reaction barrel limiter 8; the support device 5 is configured to support the reaction barrel 1; the control switch 7 is configured to control the heating device, the driving device 2 and the water adding device. 3 operation; the reaction barrel limiter 8 is set to prevent the reaction barrel 1 from shaking left and right and improve the stability of stirring.

As shown in Figure 5, the water adding device 3 also includes an inorganic core sand moisture content detection device 3-4. In this embodiment, based on the moisture content provided by the inorganic core sand moisture content detection device 3-4, the water content of the inorganic core sand is determined to be added to the reaction device. The amount of water added inside bucket 1.

The water pump 3-1 provided in this embodiment is set to control the time and the amount of water added. The amount of water added to the reaction barrel 1 is calculated according to the numerical value detected by the moisture content detector. The calculation formula is: the amount of water added = the weight of the inorganic core sand × (assuming (Determined moisture content - measured moisture content), no need to add water when the measured moisture content is not less than 1.6%; the purpose of adding water to the reaction barrel 1 is to supplement the moisture required for the reaction and increase the moisture content of the reaction environment.

Embodiment 2

This embodiment provides a reaction device for replenishing water and reusing inorganic core sand. The only difference between the reaction device and Embodiment 1 is that this embodiment omits a water adding device.

Comparative example 1

This comparative example provides a reaction device for rehydrating and reusing inorganic core sand. The only difference between the reaction device and Embodiment 1 is that the heating device is omitted in this comparative example.

Application example 1

This application example provides an inorganic core sand water absorption reaction using the reaction device for replenishing and reusing inorganic core sand provided in Embodiment 1. The reuse method is as follows:

Mix the failed inorganic core sand and water in the reaction barrel at a solid-liquid ratio of 1000:10, and then perform a water absorption reaction at a rotation speed of 60 r/min and a temperature of 30°C for 60 minutes to obtain the inorganic core sand that has restored its function.

The reuse method provided by this application also includes post-processing. The post-processing includes sequential sand extraction and sealed collection. The sand taking process is to press the sand taking button to reverse the motor, and the spiral structure inside the reaction barrel will drive the sand to roll out, and the removed inorganic core sand will be placed in a sealed bag for storage.

In one embodiment, the solid-liquid ratio of the failed inorganic core sand and water is 1000: (1-12), for example, it can be 1000:1, 1000:2, 1000:3, 1000:4, 1000: 5. 1000:6, 1000:7, 1000:8, 1000:9, 1000:10, 1000:11 or 1000:12, but not limited to the listed values. Other unlisted values within the value range are also applicable.

In one embodiment, the stirring speed is 60-200r/min, for example, it can be 60r/min, 80r/min, 100r/min, 120r/min, 140r/min, 160r/min, 180r/min or 200r /min, but is not limited to the listed values, other unlisted values within the value range are also applicable.

The temperature of the water absorption reaction is 20-70°C, for example, it can be 20°C, 30°C, 40°C, 50°C, 60°C or 70°C, but is not limited to the listed values. Other unlisted values within the numerical range are the same. Be applicable.

In one embodiment, the water absorption reaction time is 10-60 min, for example, it can be 10 min, 20 min, 30 min, 40 min, 50 min or 60 min, but is not limited to the listed values. Other unlisted values within the numerical range are also applicable. .

The solid-to-liquid ratio of the failed inorganic core sand and water in this embodiment is calculated based on the water content of the inorganic core sand.

The numerical range described in this application not only includes the point values exemplified above, but also includes any point values between the above numerical ranges that are not exemplified. Due to space limitations and for the sake of simplicity, this embodiment will not list exhaustively. The specific point values included in the stated ranges are included.

The failed inorganic core sand described in this application example is the inorganic core sand placed in a high temperature and low humidity environment for 40 minutes. The failed inorganic core sand solidifies and forms a large amount of crust.

The performance of the inorganic core sand was tested on the restored inorganic core sand, and the results are shown in Table 1.

Application example 2

This application example provides a water absorption reaction of inorganic core sand using the reaction device for replenishing water and reusing inorganic core sand provided in Example 2. The reuse method is as follows: Place the failed inorganic core sand in Inside the reaction barrel, the water absorption reaction is carried out for 60 minutes at a rotation speed of 60r/min and a temperature of 30°C to obtain inorganic core sand with restored functions.

In one embodiment, the reuse method of inorganic core sand includes: mixing failed inorganic core sand and water in a reaction barrel at a solid-to-liquid ratio of 1000: (1-12), and then mixing it at 60-200 r/min. The water absorption reaction is carried out at a rotating speed and a temperature of 20-70°C for 5-60 minutes to obtain inorganic core sand with restored functions.

Blank control

This application example provides a failed inorganic core sand. The failed inorganic core sand is an inorganic core sand placed in a high temperature and low humidity environment for 40 minutes. The failed inorganic core sand solidifies and forms a large amount of crust.

Table 1

The relativity is the ratio of the performance of the inorganic core sand to that of the initial inorganic core sand under this condition. The larger the percentage, the better the performance of the inorganic core sand.

As can be seen from Table 1, the reuse method provided by this application can react the failed inorganic core sand through water absorption, restore the incompletely cured inorganic core sand to more than 80% of its initial performance, and can continue to be used for core making.

To sum up, the reaction device provided by this application for rehydration and reuse of inorganic core sand has a simple structure, is easy to operate, and is suitable for industrial production and application; the reaction barrel 1 is a sealing device, which can absorb the incompletely solidified inorganic sand. The core sand is placed into a closed space and stirred continuously for a period of time after sealing. At the same time, the temperature of the closed space is increased to accelerate the reaction rate. The reuse method provided by this application can restore the performance of failed inorganic core sand and reuse it, avoiding the waste of binders and additives; it can also achieve long-term storage of inorganic core sand.

Claims

A reaction device for replenishing water and reusing inorganic core sand, including: a reaction barrel, a water adding device, a heating device and a driving device;

Wherein, the heating device is arranged at the bottom of the reaction barrel, the water adding device provides moisture inside the reaction barrel, and the driving device is configured to drive the rotation of the reaction barrel.
The reaction device for replenishing water and reusing inorganic core sand according to claim 1, wherein the heating device includes a temperature sensor, a heating plate and an outer frame; the temperature sensor is configured to detect the temperature in the reaction barrel, The outer frame is configured to hold the heating plate.
The reaction device for replenishing water and reusing inorganic core sand according to claim 1 or 2, wherein the driving device includes at least one of a roller drive and a screw drive; the roller drive includes a series of A motor, a gear and a roller, the surface of the roller is provided with a rubber layer, the spiral drive includes a spiral blade, and the spiral blade is arranged inside the reaction barrel.
The reaction device for replenishing water and reusing inorganic core sand according to claim 3, wherein one end of the reaction barrel is provided with a sealing cover; the reaction barrel also includes a sand guide plate; the sand guide plate The flow plate is arranged on the side close to the sealing cover.
The reaction device for replenishing and reusing inorganic core sand according to any one of claims 1 to 4, wherein the water adding device includes an inorganic core sand moisture content detection device, an atomization device and a water pump connected in sequence. and a water delivery pipe; the outlet of the water delivery pipe is located inside the reaction barrel; and the atomizing device is located at the outlet of the water delivery pipe.
The reaction device for rehydration and reuse of inorganic core sand according to any one of claims 1 to 5, wherein the reaction device further includes a support device and a control switch; the support device is configured to support a reaction barrel; The control switch is configured to control the operation of the heating device, the driving device and the water adding device.
A method for reusing inorganic core sand, which method is carried out using the reaction device for replenishing water and reusing inorganic core sand according to any one of claims 1 to 6.
The reuse method of inorganic core sand according to claim 7, wherein the method includes:

Mix the expired inorganic core sand and water in the reaction barrel; and

The mixture of the inorganic core sand and water is heated and stirred to cause the inorganic core sand to produce a water absorption reaction, thereby obtaining inorganic core sand with restored functions.
The reuse method of inorganic core sand according to claim 8, wherein the solid-liquid ratio of the failed inorganic core sand and water is 1000: (1-12), and the stirring speed is 60-200r /min, the temperature of the water absorption reaction is 20-70°C, and the time of the water absorption reaction is 5-60 min.
The reuse method of inorganic core sand according to any one of claims 7-9, wherein the failed inorganic core sand and water are mixed in a reaction barrel with a solid-liquid ratio of 1000: (1-12), and then Carry out water absorption reaction for 5-60 minutes at a rotation speed of 60-200r/min and a temperature of 20-70°C to obtain inorganic core sand with restored functions.