CN112846070B - Precoated sand recycling and regenerating process and equipment - Google Patents
Precoated sand recycling and regenerating process and equipment Download PDFInfo
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- CN112846070B CN112846070B CN202011581547.7A CN202011581547A CN112846070B CN 112846070 B CN112846070 B CN 112846070B CN 202011581547 A CN202011581547 A CN 202011581547A CN 112846070 B CN112846070 B CN 112846070B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
Abstract
The invention discloses a precoated sand recycling and regenerating process, which comprises the following steps: crushing the cast waste sand and screening the sand by using a 50-mesh screen; roasting the separated silica sand in a roasting furnace; fully and uniformly mixing the roasted silica sand with a hydrochloric acid solution, standing for a period of time, and drying to constant weight; rubbing the mixture in a rubbing regenerator; and (3) carrying out air separation and impurity removal on the mixture in an air separator. The invention also discloses rubbing and winnowing equipment used in the recovery process. According to the precoated sand recycling and regenerating process, surface impurities are removed through filtering, acidification, rubbing and winnowing, a new active surface is formed, the shape of silica sand particles is improved, the casting process performance is improved, circulating rubbing and winnowing equipment is designed according to the convenience in process implementation, and the precoated sand recycling and regenerating process is simple in structure and convenient to operate.
Description
Technical Field
The invention belongs to the field of precoated sand recovery, and particularly relates to a precoated sand recovery and regeneration process and equipment.
Background
In the existing production technology, sand is usually placed in a special box body in the processing of a sand box, a core is added in the middle of the sand box for pressing and molding, and the sand is discarded after being used, so that a large amount of waste of resources is caused, therefore, the waste sand is recycled, the method has great significance from the aspects of social benefit and economic benefit, the sand grain surface of the precoated sand core reclaimed sand contains a large amount of pollutants such as alkaline oxides and the like, which are adverse factors influencing the casting process performance of the clay completely reclaimed sand during preparation of precoated sand, and after high-temperature casting, the particle shape of silica sand particles is damaged, the particle size distribution is uneven, the mud content is large, and the casting process performance of the reclaimed precoated sand is reduced.
The invention aims to provide a precoated sand recycling and regenerating process and equipment, which are used for solving the problems in the background technology.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects, the invention aims to provide a precoated sand recycling and regenerating process, which removes surface impurities through filtering, acidification, rubbing and air separation, forms a new active surface, improves the shape of silica sand particles, improves the casting process performance, designs a circulating rubbing and air separation device according to the convenience of process implementation, and has the advantages of simple structure and convenient operation.
In order to achieve the purpose, the invention provides a precoated sand recycling and regenerating process, which comprises the following steps:
1) crushing the cast waste sand, screening the sand by using a 50-mesh screen, removing residual metal particles, and finishing primary impurity removal;
2) roasting the separated silica sand in a roasting furnace to remove phenolic resin, and removing the resin by using high temperature;
3) fully and uniformly mixing the roasted silica sand with a hydrochloric acid solution, standing for a period of time, and drying in a drying oven to constant weight to completely carry out chemical reaction of fine metal and acid;
4) rubbing the mixture in a rubbing regenerator to completely separate surface impurities from silica sand in rubbing;
5) removing impurities from the mixture by air separation in an air separator to remove mud and surface alkaline impurities, so that the impurities after rubbing are separated from silica sand;
6) and (5) repeating the step (4) and the step (5) for a plurality of times until the silica sand particles are round, so that the casting process performance of the precoated sand is improved.
Further, in the precoated sand recovery and regeneration process, in the step 2, the roasting temperature is 700 ℃ and the time is 30 minutes.
Further, in the precoated sand recycling and regenerating process, the concentration of the hydrochloric acid solution in the step 3 is 1 mol/L, the mass of the hydrochloric acid solution is 3% of the mass of the silica sand, and the standing time is 1.5 hours.
The utility model provides a tectorial membrane sand is retrieved regeneration and is used rubbing selection by winnowing equipment, includes and rubs chamber and wind selection chamber, rub chamber one side bottom of rubbing and be equipped with the second feed inlet, upper portion is equipped with first discharge gate, selection by winnowing chamber is equipped with first feed inlet, second discharge gate and goes out the dirt mouth, second feed inlet and first discharge gate let in selection by winnowing intracavity portion, it is equipped with rotatable filter screen to select by winnowing intracavity portion to be located first discharge gate below, rotatable filter screen below is equipped with the fan, the second feed inlet is located selection by winnowing chamber right side downside, the second discharge gate is located selection by winnowing chamber left side downside, and the second discharge gate is higher than second feed inlet, will rub with the hands and select by winnowing function integration in continuous equipment.
Furthermore, in the rubbing and winnowing device for recovering and regenerating the precoated sand, the rotatable filter screen is U-shaped, the center of the bottom of the rotatable filter screen is fixedly connected with the rotary switch, and the selection of the outlet is changed by changing the inclination direction of the rotatable filter screen.
Furthermore, in the rubbing winnowing device for recovering and regenerating the precoated sand, the rotary switch is a servo motor and is fixedly arranged on the rear wall of the winnowing cavity, so that automatic management is facilitated.
Further, according to the scrubbing and winnowing device for recovering and regenerating the precoated sand, the scrubbing cavity comprises a motor, a rotating shaft, a spiral piece and a grinding disc, the rotating shaft is connected with the motor through a coupling, the spiral piece and the grinding disc are sleeved on the rotating shaft, and the grinding disc is mounted on the upper portion of the spiral piece to finish automatic feeding and scrubbing.
Furthermore, the rubbing winnowing device for recovering and regenerating the precoated sand has the advantages that the grinding disc is conical at the bottom and cylindrical at the upper part, so that the rubbing effect is enhanced.
Preferably, in the rubbing winnowing device for recovering and regenerating the precoated sand, an annular grinding plate is sleeved on the inner wall of the rubbing cavity corresponding to the grinding disc, so that the rubbing effect is further enhanced.
Compared with the prior art, the invention has the beneficial effects that:
1. the precoated sand recycling and regenerating process removes surface impurities through filtration, acidification, rubbing and air separation, forms a new active surface, improves the shape of silica sand particles and improves the casting process performance of the silica sand particles.
2. The rubbing and winnowing device for recovering and regenerating the precoated sand integrates the rubbing cavity and the winnowing cavity, so that the automatic control of the two related processes is facilitated, the efficiency is improved, the cost is reduced, and the installation is convenient.
3. The rubbing and winnowing equipment for recovering and regenerating the precoated sand disclosed by the invention is convenient to implement the precoated sand recovering and regenerating process and simplifies the operation of a circulating process by utilizing the rotatable filter screen to select the continuous rubbing or discharging of the silica sand.
Drawings
FIG. 1 is a schematic structural view of the rubbing and winnowing device of the present invention;
FIG. 2 is a schematic diagram of a rotatable filter screen according to the present invention.
Detailed Description
The invention will be further elucidated by taking one kilogram of foundry waste sand as an example, with reference to the accompanying drawings and specific examples.
In the description of the present invention, it is to be understood that the terms "lateral", "length", "width", "thickness", "upper", "lower", "left", "right", "front", "rear", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the invention.
A precoated sand recycling and regenerating process comprises the following steps:
1) crushing 1 kg of waste sand after casting, and screening sand by using a 50-mesh screen to remove residual metal particles;
2) roasting the separated silica sand in a roasting furnace to remove the phenolic resin, wherein the roasting temperature is 700 ℃, and the roasting time is 30 minutes;
3) fully and uniformly mixing the roasted silica sand with 30 g of hydrochloric acid solution, standing for 1.5 hours, and drying in a drying oven to constant weight;
4) rubbing and regenerating the mixture in rubbing and winnowing equipment in the invention, and repeating for 3 times;
the normal temperature tensile strength and the thermal state tensile strength of the obtained regenerated precoated sand are superior to those of the original sand, and the regenerated precoated sand is suitable for being used as a precoated sand casting core.
A rubbing and winnowing device for recovering and regenerating coated sand is shown in figure 1 and comprises a rubbing cavity 1 and a winnowing cavity 2, wherein a second feeding hole 110 is formed in the bottom of one side of the rubbing cavity 1, a first discharging hole 120 is formed in the upper portion of the rubbing cavity, the winnowing cavity 2 is provided with a first feeding hole 210, a second discharging hole 220 and a dust outlet 24, the second feeding hole 110 and the first discharging hole 120 are communicated into the winnowing cavity 2, a rotatable filter screen 21 is arranged below the first discharging hole 120 in the winnowing cavity 2, a fan 22 is arranged below the rotatable filter screen 21, the second feeding hole 110 is arranged on the lower right side of the winnowing cavity 2, the second discharging hole 220 is arranged on the lower left side of the winnowing cavity 2, and the second discharging hole 220 is higher than the second feeding hole 110.
Further, as shown in fig. 2, in the rubbing and winnowing device for recovering and regenerating precoated sand, the rotatable filter screen 21 is U-shaped, and the center of the bottom of the rotatable filter screen is fixedly connected with a rotary switch 23.
Further, in the rubbing and winnowing device for recovering and regenerating the precoated sand, the rotary switch 23 is a servo motor and is fixedly installed on the rear wall of the winnowing cavity 2.
Further, as shown in fig. 1, in the above-mentioned scrubbing and winnowing device for recovering and regenerating precoated sand, the scrubbing chamber 1 includes a motor 11, a rotating shaft 12, a spiral piece 13 and a grinding disc 14, the rotating shaft 12 is connected to the motor 11 through a coupling, the spiral piece 13 and the grinding disc 14 are sleeved on the rotating shaft 12, and the grinding disc 14 is mounted on the upper portion of the spiral piece 13.
Further, as shown in fig. 1, in the rubbing and winnowing device for recovering and regenerating the precoated sand, the grinding disc 14 is conical at the bottom and cylindrical at the upper part.
Further, as shown in fig. 1, in the rubbing and winnowing device for recovering and regenerating the precoated sand, an annular grinding sheet 15 is sleeved on the inner wall of the rubbing cavity 1 at a position corresponding to the grinding disc 14.
The working principle is as follows:
the acidified and dried silica sand is fed through the first feeding hole 210 and enters the rubbing cavity 1, the silica sand is fed under the action of the spiral plate 13, and is rubbed with the grinding disc 14 and the annular grinding disc 15 in the rising process, so that surface mud and alkaline impurities are separated from the surface of the silica sand, the silica sand tends to be more spherical, then the silica sand enters the winnowing cavity 2 through the second discharging hole 120, the rotatable filter screen 21 inclines towards the lower right, the impurities rubbed under the action of the fan 22 in the sliding process are discharged through the dust outlet 24, the silica sand enters the rubbing cavity 1 again through the second feeding hole 110, the rotatable filter screen 21 inclines towards the lower left after repeating twice, and the silica sand is discharged through the second discharging hole 220.
The above-mentioned embodiments should not be construed as limiting the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. which are made by those skilled in the art within the spirit and principle of the present invention and which are beneficial to the changes of the voltage, temperature, time, etc. of the heating softening and electrofusion welding of different materials and different pipe diameters should be included in the scope of the present invention, and the contents which are not described in detail in the present specification are the prior art known to those skilled in the art.
Claims (9)
1. A rubbing winnowing device for recovering and regenerating precoated sand is characterized by comprising a rubbing cavity (1) and a winnowing cavity (2), a second feeding hole (110) is arranged at the bottom of one side of the rubbing cavity (1), a first discharging hole (120) is arranged at the upper part, the air separation cavity (2) is provided with a first feeding hole (210), a second discharging hole (220) and a dust outlet (24), the second feeding hole (110) and the first discharging hole (120) are communicated with the interior of the air separation cavity (2), a rotatable filtering screen (21) is arranged below the first discharge hole (120) in the air separation cavity (2), a fan (22) is arranged below the rotatable filtering screen (21), the second feeding hole (110) is positioned at the right lower side of the air separation cavity (2), the second discharge hole (220) is positioned at the left lower side of the air separation cavity (2), and the second discharge hole (220) is higher than the second feed hole (110).
2. The rubbing and winnowing device for precoated sand recovery and regeneration according to claim 1, characterized in that: the rotatable filtering screen (21) is U-shaped, and the center of the bottom of the rotatable filtering screen is fixedly connected with a rotary switch (23).
3. The rubbing and winnowing device for precoated sand recovery and regeneration according to claim 2, characterized in that: the rotary switch (23) is a servo motor and is fixedly arranged on the rear wall of the air separation cavity (2).
4. The rubbing and winnowing device for precoated sand recovery and regeneration according to claim 1, characterized in that: the scrubbing cavity (1) comprises a motor (11), a rotating shaft (12), a spiral plate (13) and a grinding disc (14), the rotating shaft (12) is connected with the motor (11) through a coupler, the spiral plate (13) and the grinding disc (14) are sleeved on the rotating shaft (12), and the grinding disc (14) is installed on the upper portion of the spiral plate (13).
5. The rubbing and winnowing device for precoated sand recovery and regeneration according to claim 4, characterized in that: the grinding disc (14) is conical at the bottom and cylindrical at the upper part.
6. The rubbing and winnowing device for precoated sand recovery and regeneration according to claim 4, characterized in that: an annular grinding disc (15) is sleeved on the inner wall of the rubbing cavity (1) corresponding to the grinding disc (14).
7. The precoated sand recycling and regenerating process adopts the rubbing and winnowing equipment for the precoated sand recycling and regenerating as claimed in claim 1, and is characterized in that: the method comprises the following steps:
1) crushing the cast waste sand, and screening the sand by using a 50-mesh screen to remove residual metal particles;
2) roasting the separated silica sand in a roasting furnace to remove phenolic resin;
3) fully and uniformly mixing the roasted silica sand with a hydrochloric acid solution, standing for a period of time, and drying in a drying oven to constant weight;
4) rubbing the mixture in a rubbing regenerator;
5) removing impurities from the mixture by air separation in an air separator to remove mud and surface alkaline impurities;
6) and (5) repeating the step (4) and the step (5) for a plurality of times until the silica sand particles are round.
8. The precoated sand recovery regeneration process according to claim 7, characterized in that: in the step 2, the roasting temperature is 700 ℃, and the roasting time is 30 minutes.
9. The precoated sand recovery regeneration process according to claim 8, characterized in that: in the step 3, the concentration of the hydrochloric acid solution is 1 mol/L, the mass of the hydrochloric acid solution is 3% of that of the silica sand, and the standing time is 1.5 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011581547.7A CN112846070B (en) | 2020-12-28 | 2020-12-28 | Precoated sand recycling and regenerating process and equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011581547.7A CN112846070B (en) | 2020-12-28 | 2020-12-28 | Precoated sand recycling and regenerating process and equipment |
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| Publication Number | Publication Date |
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| CN112846070A CN112846070A (en) | 2021-05-28 |
| CN112846070B true CN112846070B (en) | 2022-09-23 |
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| CN201669373U (en) * | 2010-06-02 | 2010-12-15 | 无锡锡南铸造机械有限公司 | Two stage continuous type rubbing sand regeneration machine |
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| CN209238964U (en) * | 2018-11-07 | 2019-08-13 | 无锡市康晖机械制造有限公司 | A kind of rotating disc type reclaiming machine for waste sand |
| CN209579172U (en) * | 2019-03-25 | 2019-11-05 | 北京百旺环境科技股份有限公司 | A kind of Machine-made Sand particle shaping equipment |
| CN110935842A (en) * | 2019-10-18 | 2020-03-31 | 贵阳白云合金熔铸厂 | Precoated sand hot rubbing regeneration method and system |
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2020
- 2020-12-28 CN CN202011581547.7A patent/CN112846070B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201669373U (en) * | 2010-06-02 | 2010-12-15 | 无锡锡南铸造机械有限公司 | Two stage continuous type rubbing sand regeneration machine |
| CN102009122A (en) * | 2010-12-09 | 2011-04-13 | 柳州市奥凯工程机械有限公司 | Waste foundry sand regenerating process method |
| CN103736911A (en) * | 2014-01-27 | 2014-04-23 | 无锡锡南铸造机械有限公司 | Bucket-wheel regenerating machine with variable demolding ratio for molding sand |
| CN204504137U (en) * | 2015-01-30 | 2015-07-29 | 青田中天铸造阀门有限公司 | A kind of sand shakeout system |
| CN107983907A (en) * | 2017-11-28 | 2018-05-04 | 合肥仁创铸造材料有限公司 | The method of recycling cast waste sand |
| CN108723287A (en) * | 2018-06-11 | 2018-11-02 | 重庆长江造型材料（集团）股份有限公司 | A kind of thermal regeneration method of the inorganic overlay film hygrometric state antiquated sand of silicates |
| CN209238964U (en) * | 2018-11-07 | 2019-08-13 | 无锡市康晖机械制造有限公司 | A kind of rotating disc type reclaiming machine for waste sand |
| CN209579172U (en) * | 2019-03-25 | 2019-11-05 | 北京百旺环境科技股份有限公司 | A kind of Machine-made Sand particle shaping equipment |
| CN110935842A (en) * | 2019-10-18 | 2020-03-31 | 贵阳白云合金熔铸厂 | Precoated sand hot rubbing regeneration method and system |
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| CN112846070A (en) | 2021-05-28 |
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Effective date of registration: 20220815 Address after: 571300 Baode Road (186 Township Road West)-1, Changxin Village, Changsa Town, Wenchang City, Hainan Province Applicant after: Yawei Technology (Wenchang) Co., Ltd. Address before: 221400 No.3 industrial standard workshop, Wayao Town, Xinyi City, Xuzhou City, Jiangsu Province Applicant before: Yawei machinery manufacturing (Xuzhou) Co.,Ltd. |
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