CN111957886A - Comprehensive regeneration and reuse process based on casting waste molding sand - Google Patents
Comprehensive regeneration and reuse process based on casting waste molding sand Download PDFInfo
- Publication number
- CN111957886A CN111957886A CN202010933139.7A CN202010933139A CN111957886A CN 111957886 A CN111957886 A CN 111957886A CN 202010933139 A CN202010933139 A CN 202010933139A CN 111957886 A CN111957886 A CN 111957886A
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- molding sand
- sand
- foundry waste
- magnetic core
- waste molding
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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
- B22C5/10—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by dust separating
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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
- B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
-
- 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
- B22C5/06—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sieving or magnetic separating
-
- 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
- B22C5/08—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sprinkling, cooling, or drying
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a comprehensive regeneration and reuse process based on foundry waste molding sand, which comprises the steps of firstly collecting foundry waste molding sand, then carrying out cutting and crushing treatment on the foundry waste molding sand, conveying the foundry waste molding sand after cutting and crushing through a cyclone separator after crushing treatment, collecting metal residues in the foundry waste molding sand through a magnetic core in the cyclone separator, and conveying the metal residues into an original foundry metal smelting furnace for processing and mixing with original metal; the method comprises the steps of spraying the separated used molding sand, collecting dust in the conveying process after spraying, then burning the used molding sand, burning combustible dust in the used molding sand, finally carrying out secondary screening treatment on the burnt used molding sand, cooling, finally obtaining molding sand recycled materials, and mixing the molding sand recycled materials with new molding sand for recycling.
Description
Technical Field
The invention relates to the technical field of waste sand recycling, in particular to a comprehensive regeneration and reuse process based on casting waste molding sand.
Background
The molding sand can be divided into surface sand, filling sand, single sand and the like. The facing sand is a layer of molding sand tightly attached to a casting, and the quality requirement is high. The filled sand is not contacted with molten metal after being arranged on the surface sand layer, and the quality requirement is not strict. The single sand is molding sand without surface sand and back sand, and is mainly used for machine molding. In addition, the sand mold of the large casting is usually dried and then poured, and the used molding sand contains more clay, which is called dry mold sand; the molding sand used by the wet-type pouring method is less in clay content and is called wet-type sand.
The molding sand is generally prepared by mixing molding materials such as raw sand for casting, a molding sand binder, auxiliary additives and the like according to a certain proportion. The molding sand can be classified into clay sand, water glass sand, cement sand, resin sand, etc. according to the binder used. Clay sand, sodium silicate sand and resin sand are used most. The role of the molding sand in the foundry practice is extremely important, and the waste products of the castings due to the poor quality of the molding sand account for about 30 to 50% of the total waste products of the castings. Therefore, the molding sand is a main molding material in modern casting production and is a big head of waste generated in the casting industry. The casting sand used in casting in China is over 2400 million tons every year, the sand used in casting is high-quality quartz sand, the casting sand used in the foundry industry in China accounts for over 80 percent of the casting sand used in various casting molds, over 2000 million tons of new sand is consumed every year, a large amount of waste sand is discharged, the pollution conditions are different due to the adoption of various binders and iron impurities, the common sodium silicate sand contains sodium silicate, the soil is alkaline, grass is burnt, fish does not grow, the production cost of resin sand is high, the environmental pollution is serious, the harm to human bodies is large, if the used sand cannot be regenerated and reaches or approaches the quality of the original sand, the used sand can be thrown away as waste, the environment is seriously polluted, and therefore, how to recycle the used sand is the used sand, which is a great problem that foundry enterprises must face, and how to recycle the waste molding sand, the pollution is avoided, and the secondary use efficiency is increased, which is very important.
Disclosure of Invention
The invention aims to provide a comprehensive regeneration and reuse process based on foundry waste molding sand, which aims to solve the problem of how to recycle the waste molding sand in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a comprehensive regeneration and reuse process based on foundry waste molding sand specifically comprises the following steps:
s1, collecting the foundry waste molding sand, and adsorbing and collecting dust in the foundry waste molding sand through air blowing equipment in the collection process;
s2, cutting and crushing the foundry waste molding sand processed in the step S1, conveying the cut and crushed foundry waste molding sand through a cyclone separator after crushing, and collecting metal residues in the foundry waste molding sand through a magnetic core in the cyclone separator so as to realize the separation effect of separating the metal residues from the mixture of the old molding sand; then, the metal residue obtained by the separation is sent to step S6, and the used molding sand obtained by the separation is sent to step S3;
s3, spraying the used molding sand processed in the step S2, and collecting dust in the conveying process after spraying;
s4, burning the old molding sand processed in the step S3, and burning combustible dust in the old molding sand, wherein the heating temperature is 220-280 ℃, and the burning temperature is 600-700 ℃; then, the process proceeds to step S5;
s5, carrying out secondary screening treatment on the burnt old molding sand, cooling to obtain a molding sand recovery product, and mixing the molding sand recovery product with new molding sand for reuse;
and S6, feeding the metal residues into the original cast metal smelting furnace for processing and mixing with the original metal.
Further, the specific structure of the magnetic core collection in step S2 is as follows: the magnetic core is arranged at the lower end opening of the cyclone separator, a conveying pipeline is arranged on the two sides of the conveying pipeline, a magnetic core rod capable of moving towards the left side and the right side is arranged on the two sides of the conveying pipeline, the magnetic core rod is located under the lower end opening of the cyclone separator, a first air cylinder is connected to the other end of the magnetic core rod, metal collecting bins are arranged on the two sides of the lower side of the conveying pipeline, and a vibrating motor and a scraping blade which can vibrate metal residues on the magnetic core rod are arranged above the metal collecting bins.
Further, a rotating electric machine for driving the magnetic core rod to rotate is provided between the magnetic core rod and the first cylinder.
Further, the heating temperature in step S4 is 250 ℃.
Further, the specific steps of sieving in the secondary sieving process in step S5 are as follows: the old molding sand of big granule is filtered through sieving for the first time, and the second time is sieved and is filtered impurity, and the old molding sand of big granule is smashed and is sent back to after grinding and mix in the old molding sand after the secondary sieves simultaneously.
Further, the air blowing process of the foundry waste molding sand in step S1 is to separate the dust from the foundry waste molding sand and to secondarily recover a small amount of the foundry waste molding sand in the dust by spraying the collected dust.
Further, the pulverization is roller-crushed pulverization using guide rollers in step S2.
Further, the combustion temperature in step S4 is 680 ℃.
Further, in step S5, cooling is performed by air cooling plus isolation water cooling.
Further, step S7 is added between step S4 and step S3, and the used sand processed in step S3 is subjected to a surface cleaning step before being subjected to a burning treatment.
The comprehensive regeneration and reuse process based on the foundry waste molding sand is obtained by collecting the foundry waste molding sand, adsorbing and collecting dust in the foundry waste molding sand through air blowing equipment in the collection process, then cutting and crushing the foundry waste molding sand, conveying the cut and crushed foundry waste molding sand through a cyclone separator after crushing, and collecting metal residues in the foundry waste molding sand through a magnetic core in the cyclone separator 1, so that the separation effect of separating the metal residues from the mixture of old molding sand is realized; feeding the metal residues into an original cast metal smelting furnace for processing and mixing with original metal; spray the processing with the old type sand that the separation obtained, be used for collecting the dust of transportation process after spraying, then carry out the burning processing with old type sand, burn the combustible dust in the old molding sand, carry out the secondary to the old type sand after the burning and sieve the processing at last, after the cooling, finally obtain the molding sand and retrieve the thing, then mix the recycle with new molding sand, consequently realize carrying out quick convenient recycle and processing to casting abandonment molding sand through above-mentioned technology, improve whole work efficiency, avoid secondary pollution.
Drawings
Fig. 1 is a schematic structural diagram related to step S2 in the process for reclaiming and recycling foundry waste molding sand in example 1;
fig. 2 is a schematic structural diagram related to step S2 in the process for reclaiming and recycling foundry waste molding sand in example 2.
In the figure: cyclone 1, pipeline 2, magnetic core stick 3, first cylinder 4, metal collecting bin 5, vibrating motor 6, doctor-bar 7, rotating electrical machines 8.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the embodiment provides a comprehensive regeneration and reuse process based on foundry waste molding sand, which specifically comprises the following steps:
s1, collecting the foundry waste molding sand, and adsorbing and collecting dust in the foundry waste molding sand through air blowing equipment in the collection process;
s2, cutting and crushing the foundry waste molding sand processed in the step S1, conveying the cut and crushed foundry waste molding sand through a cyclone separator after crushing, and collecting metal residues in the foundry waste molding sand through a magnetic core in the cyclone separator 1 so as to realize the separation effect of separating the metal residues from the mixture of the old molding sand; then, the metal residue obtained by the separation is sent to step S6, and the used molding sand obtained by the separation is sent to step S3;
s3, spraying the used molding sand processed in the step S2, and collecting dust in the conveying process after spraying;
s4, burning the old molding sand processed in the step S3, and burning combustible dust in the old molding sand, wherein the heating temperature is 220-280 ℃, and the burning temperature is 600-700 ℃; then, the process proceeds to step S5;
s5, carrying out secondary screening treatment on the burnt old molding sand, cooling to obtain a molding sand recovery product, and mixing the molding sand recovery product with new molding sand for reuse;
and S6, feeding the metal residues into the original cast metal smelting furnace for processing and mixing with the original metal.
Referring to fig. 1, further, the specific structure of the magnetic core collection in step S2 is as follows: the magnetic core is arranged at the lower end opening of the cyclone separator 1 and is provided with a conveying pipeline 2, magnetic core rods 3 capable of moving towards the left side and the right side are arranged on two sides of the conveying pipeline 2, the magnetic core rods 3 are located under the lower end opening of the cyclone separator 1, a first air cylinder 4 is connected to the other ends of the magnetic core rods 3, metal collecting bins 5 are arranged on two sides of the lower portion of the conveying pipeline 2, and a vibrating motor 6 and a scraping blade 7 for vibrating metal residues on the magnetic core rods 3 are arranged above the metal collecting bins 5.
Further, the heating temperature in step S4 is 250 ℃.
Further, the specific steps of sieving in the secondary sieving process in step S5 are as follows: the old molding sand of big granule is filtered through sieving for the first time, and the second time is sieved and is filtered impurity, and the old molding sand of big granule is smashed and is sent back to after grinding and mix in the old molding sand after the secondary sieves simultaneously.
Further, the air blowing process of the foundry waste molding sand in step S1 is to separate the dust from the foundry waste molding sand and to secondarily recover a small amount of the foundry waste molding sand in the dust by spraying the collected dust.
Further, the pulverization is roller-crushed pulverization using guide rollers in step S2.
Further, the combustion temperature in step S4 is 680 ℃.
Further, in step S5, cooling is performed by air cooling plus isolation water cooling.
Further, step S7 is added between step S4 and step S3, and the used sand processed in step S3 is subjected to a surface cleaning step before being subjected to a burning treatment.
During operation, the casting waste molding sand is collected firstly, dust in the casting waste molding sand is adsorbed and collected through air blowing equipment in the collection process, then the casting waste molding sand is cut and crushed, the cut and crushed casting waste molding sand is conveyed through a cyclone separator after the crushing treatment, and metal residues in the casting waste molding sand are collected through a magnetic core in the cyclone separator 1, so that the separation effect of separating the metal residues from the mixture of the old molding sand is realized; feeding the metal residues into an original cast metal smelting furnace for processing and mixing with original metal; spraying the separated old molding sand, collecting dust in the conveying process after spraying, and then burning the old molding sand, wherein the combustible dust in the old molding sand is burnt, the heating temperature is 220-280 ℃, and the burning temperature is 600-700 ℃; and finally, carrying out secondary screening treatment on the burnt used molding sand, cooling, finally obtaining molding sand recycled materials, mixing the molding sand with new molding sand for recycling, and thus, realizing quick and convenient recycling treatment on the casting waste molding sand through the process, improving the overall working efficiency and avoiding secondary pollution.
Example 2:
as shown in fig. 2, the process of the present embodiment is the same as that of embodiment 1, except that a rotary motor 8 for rotating the core rod 3 is provided between the core rod 3 and the first cylinder 4 in order to improve the effect of rapidly collecting the metal.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A comprehensive regeneration and reuse process based on foundry waste molding sand is characterized by comprising the following steps:
s1, collecting the foundry waste molding sand, and adsorbing and collecting dust in the foundry waste molding sand through air blowing equipment in the collection process;
s2, cutting and crushing the casting waste molding sand processed in the step S1, conveying the casting waste molding sand after cutting and crushing through a cyclone separator (1), and collecting metal residues in the casting waste molding sand through a magnetic core in the cyclone separator (1) so as to realize the separation effect of separating the mixture of the metal residues and the old molding sand; then, the metal residue obtained by the separation is sent to step S6, and the used molding sand obtained by the separation is sent to step S3;
s3, spraying the used molding sand processed in the step S2, and collecting dust in the conveying process after spraying;
s4, burning the old molding sand processed in the step S3, and burning combustible dust in the old molding sand, wherein the heating temperature is 220-280 ℃, and the burning temperature is 600-700 ℃; then, the process proceeds to step S5;
s5, carrying out secondary screening treatment on the burnt old molding sand, cooling to obtain a molding sand recovery product, and mixing the molding sand recovery product with new molding sand for reuse;
and S6, feeding the metal residues into the original cast metal smelting furnace for processing and mixing with the original metal.
2. The comprehensive recycling process of foundry waste molding sand as claimed in claim 1, which is characterized in that: the specific structure of the magnetic core collection in step S2 is as follows: the magnetic core is arranged at a lower end opening of the cyclone separator (1) and is provided with a conveying pipeline (2), magnetic core rods (3) capable of moving towards the left side and the right side are arranged on two sides of the conveying pipeline (2), the magnetic core rods (3) are located under the lower end opening of the cyclone separator (1), a first air cylinder (4) is connected to the other end of each magnetic core rod (3), metal collecting bins (5) are arranged on two sides of the lower portion of the conveying pipeline (2), and a vibrating motor (6) and a scraping blade (7) which can vibrate metal residues on the magnetic core rods (3) are arranged above the metal collecting bins (5).
3. The comprehensive recycling process of foundry waste molding sand as claimed in claim 2, which is characterized in that: a rotating motor (8) for driving the magnetic core rod (3) to rotate is arranged between the magnetic core rod (3) and the first air cylinder (4).
4. The comprehensive recycling process of foundry waste molding sand as claimed in claim 1, which is characterized in that: the heating temperature in step S4 was 250 ℃.
5. The comprehensive recycling process of foundry waste molding sand as claimed in claim 1, which is characterized in that: the specific steps of sieving in the secondary sieving process in step S5 are as follows: the old molding sand of big granule is filtered through sieving for the first time, and the second time is sieved and is filtered impurity, and the old molding sand of big granule is smashed and is sent back to after grinding and mix in the old molding sand after the secondary sieves simultaneously.
6. The comprehensive recycling process of foundry waste molding sand as claimed in claim 1, which is characterized in that: the blowing process of the foundry waste molding sand in step S1 is to separate the dust from the foundry waste molding sand while spraying the collected dust to secondarily recover a small amount of the foundry waste molding sand in the dust.
7. The comprehensive recycling process of foundry waste molding sand as claimed in claim 1, which is characterized in that: the pulverization is crushed using a guide roller in step S2.
8. The comprehensive recycling process of foundry waste molding sand as claimed in claim 1, which is characterized in that: the combustion temperature in step S4 was 680 ℃.
9. The process of claim 1, wherein the cooling step S5 is carried out by air cooling and isolated water cooling.
10. The comprehensive recycling process of foundry waste molding sand as claimed in claim 6, which is characterized in that: step S7 is added between step S4 and step S3, and the used sand processed in step S3 is subjected to a surface cleaning step before being subjected to a burning treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010933139.7A CN111957886A (en) | 2020-09-08 | 2020-09-08 | Comprehensive regeneration and reuse process based on casting waste molding sand |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010933139.7A CN111957886A (en) | 2020-09-08 | 2020-09-08 | Comprehensive regeneration and reuse process based on casting waste molding sand |
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| CN111957886A true CN111957886A (en) | 2020-11-20 |
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| CN202010933139.7A Pending CN111957886A (en) | 2020-09-08 | 2020-09-08 | Comprehensive regeneration and reuse process based on casting waste molding sand |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117861323A (en) * | 2024-03-11 | 2024-04-12 | 山东华顺环保科技股份有限公司 | Tail gas treatment and recovery device for smelting furnace |
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| KR20040009290A (en) * | 2002-07-23 | 2004-01-31 | 아이앤아이스틸 주식회사 | separation system of moulding sand |
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| CN111054887A (en) * | 2020-01-17 | 2020-04-24 | 吴广 | A environment-friendly equipment for abandonment molding sand is retrieved |
| CN210547824U (en) * | 2019-06-25 | 2020-05-19 | 山西古冶鑫盛铸造股份有限公司 | Foundry sand recycling device |
| CN210848197U (en) * | 2019-11-18 | 2020-06-26 | 正阳县精工机械有限责任公司 | Magnetic iron removing device for sand casting |
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2020
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040009290A (en) * | 2002-07-23 | 2004-01-31 | 아이앤아이스틸 주식회사 | separation system of moulding sand |
| CN104162630A (en) * | 2014-09-05 | 2014-11-26 | 甘肃永靖昌盛铸钢有限责任公司 | Method for recycling waste molding sand for casting |
| CN207749207U (en) * | 2017-12-22 | 2018-08-21 | 崇义县威骏高分子功能材料科技有限公司 | A kind of novel high tenacity ecology nonwoven fabric manufacture filtering Windspout knot screen |
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| CN109701474A (en) * | 2019-01-07 | 2019-05-03 | 福州大学 | A magnetron direct current discharge device and method |
| CN210547824U (en) * | 2019-06-25 | 2020-05-19 | 山西古冶鑫盛铸造股份有限公司 | Foundry sand recycling device |
| CN210848197U (en) * | 2019-11-18 | 2020-06-26 | 正阳县精工机械有限责任公司 | Magnetic iron removing device for sand casting |
| CN111054887A (en) * | 2020-01-17 | 2020-04-24 | 吴广 | A environment-friendly equipment for abandonment molding sand is retrieved |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117861323A (en) * | 2024-03-11 | 2024-04-12 | 山东华顺环保科技股份有限公司 | Tail gas treatment and recovery device for smelting furnace |
| CN117861323B (en) * | 2024-03-11 | 2024-05-10 | 山东华顺环保科技股份有限公司 | Smelting furnace tail gas treatment and recovery device |
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