CN114273603A - A mixed raw sand - Google Patents
A mixed raw sand Download PDFInfo
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- CN114273603A CN114273603A CN202111508259.3A CN202111508259A CN114273603A CN 114273603 A CN114273603 A CN 114273603A CN 202111508259 A CN202111508259 A CN 202111508259A CN 114273603 A CN114273603 A CN 114273603A
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- Prior art keywords
- sand
- casting
- limestone
- mixed raw
- quartz
- Prior art date
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- 239000004576 sand Substances 0.000 title claims abstract description 102
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 121
- 238000005266 casting Methods 0.000 claims abstract description 36
- 235000019738 Limestone Nutrition 0.000 claims abstract description 23
- 239000006028 limestone Substances 0.000 claims abstract description 23
- 239000006004 Quartz sand Substances 0.000 claims abstract description 17
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000007528 sand casting Methods 0.000 claims abstract description 12
- 239000004927 clay Substances 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 239000004115 Sodium Silicate Substances 0.000 claims description 7
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 7
- 239000010419 fine particle Substances 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 14
- 235000019353 potassium silicate Nutrition 0.000 abstract description 7
- 201000010001 Silicosis Diseases 0.000 abstract description 4
- 231100000572 poisoning Toxicity 0.000 abstract description 3
- 230000000607 poisoning effect Effects 0.000 abstract description 3
- 238000005245 sintering Methods 0.000 abstract description 3
- 238000004140 cleaning Methods 0.000 abstract description 2
- 230000008595 infiltration Effects 0.000 abstract description 2
- 238000001764 infiltration Methods 0.000 abstract description 2
- 230000008961 swelling Effects 0.000 abstract 1
- 229910001141 Ductile iron Inorganic materials 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 239000010453 quartz Substances 0.000 description 3
- 229910001060 Gray iron Inorganic materials 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000000440 bentonite Substances 0.000 description 2
- 229910000278 bentonite Inorganic materials 0.000 description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000003670 easy-to-clean Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011044 quartzite Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
Images
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- Mold Materials And Core Materials (AREA)
Abstract
本发明涉及一种混配原砂。该混配原砂由石英砂和石灰石砂组成，其中石英砂和石灰石砂的重量比为：(81‑99.8)％﹕(0.2‑19)％，所述混配原砂用于黏土砂铸造或水玻璃砂铸造。该混配原砂用于黏土砂或水玻璃砂铸造生产，可消除铸件渗透、烧结类缺陷和膨胀类缺陷，解决铸件的气孔和缩沉问题，改善清砂困难，防止工人矽肺问题和CO中毒问题，同时成本低廉。
The invention relates to a mixed raw sand. The mixed raw sand is composed of quartz sand and limestone sand, wherein the weight ratio of quartz sand and limestone sand is: (81-99.8)%: (0.2-19)%, and the mixed raw sand is used for clay sand casting or Water glass sand casting. The mixed raw sand is used in the production of clay sand or water glass sand, which can eliminate the infiltration, sintering defects and swelling defects of the castings, solve the porosity and subsidence problems of the castings, improve the difficulty of sand cleaning, and prevent workers from silicosis and CO poisoning. problems, and at the same time low cost.
Description
Technical Field
The invention belongs to the field of casting, and particularly relates to mixed raw sand.
Background
Casting is the foundation of the equipment manufacturing industry. Clay sand mold casting is the main body of the casting and forming process, and sodium silicate sand casting is one of the three casting and forming processes. The raw sand plays an important role in clay sand mold casting or sodium silicate sand casting production. At present, the raw sand for clay sand mold casting or water glass sand casting mainly comprises quartz raw sand and non-quartz raw sand.
Quartzite raw sand is the most commonly used raw sand in foundry production. The source is wide, the price is low, and the requirements of iron castings and steel castings production can be generally met. But also has a plurality of defects, which are easy to cause casting infiltration and sintering defects, expansion defects, serious diseases such as silicosis of workers and the like.
Limestone raw sand is also non-quartz raw sand which is more applied in casting production. The resources are rich, the harm of silicosis can be greatly reduced, the casting is not sintered, sand is easy to clean, and the defect of expansion is not easy to generate. However, the limestone sand is decomposed to generate gas during pouring, so that the casting is subjected to air holes, and the casting is easy to have quality problems such as shrinkage and wormcast cracking. In addition, there is a problem of CO poisoning.
At present, in the clay sand casting or sodium silicate sand casting production all over the world, quartz sand and limestone sand are usually used separately, and the defects are inherent and exist simultaneously.
Disclosure of Invention
The invention aims to solve the technical problem of providing mixed raw sand to overcome the defect caused by adopting single raw sand for clay sand mold casting or sodium silicate sand casting in the prior art, and the invention can fully exert the advantages of various raw sands.
The invention provides mixed raw sand which consists of quartz sand and limestone sand, wherein the weight ratio of the quartz sand to the limestone sand is as follows: (81-99.8)% (0.2-19)%, and the mixed raw sand is used for clay sand casting or sodium silicate sand casting.
Preferably, in the mixed raw sand, the weight ratio of the quartz sand to the limestone sand is (81-98)% (2-19)%.
Preferably, in the mixed raw sand, the limestone sand includes various fine particles prepared by crushing and screening ore rocks with limestone as a main component.
Preferably, in the mixed raw sand, the particle size of the mixed raw sand after mixing and screening is 40-270 meshes.
Preferably, in the mixed crude sand, the mixed crude sand is used for producing castings.
Advantageous effects
The mixed raw sand is used for casting production of clay sand or sodium silicate sand, and can obtain the following beneficial effects:
a. and (5) casting quality. Not only can eliminate the sintering defects and the expansion defects of the castings and improve the difficulty of sand cleaning, but also can solve the problems of air holes, shrinkage and the like of the castings.
b. The labor and the sanitation. Not only can prevent silicosis problem of workers, but also can prevent CO poisoning problem.
c. The production cost is low. Can keep the advantages of wide resource sources and low cost of the two.
Drawings
FIG. 1 is a drawing of a gray iron enclosure casting obtained in example 1.
Fig. 2 is a drawing of a small ductile iron pump casing casting obtained in example 2.
FIG. 3 is a drawing of the ZG45 pump casing cast steel obtained in example 3.
Fig. 4 is a drawing of a ductile iron valve casting obtained in example 4.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
The reagents referred to in the examples are commercially available products.
Example 1
Taking 2000Kg of quartz sand and 100Kg of limestone sand, and uniformly mixing in a sand mixer to produce sand, thereby obtaining the mixed raw sand. The gas forming amount of the mixed raw sand at the test temperature of 1000 ℃ is 10.5ml/g, which is higher than that of pure quartz sand but far lower than that of pure limestone sand.
Putting 1000Kg of mixed raw sand into a sand mixer, adding 7% of bentonite and 4.0% of water, mixing well, and discharging sand for later use. Manually molding by using mixed wet-type mixed sand, then stripping, and pouring a gray iron piece after mold combination. The surface of the casting is easy to remove sand, and the casting has no defects (as shown in figure 1).
Example 2
2000Kg of quartz sand and 300Kg of limestone sand are taken and mixed evenly in a sand mixer to produce sand, thus obtaining the mixed raw sand. The gas forming amount of the mixed raw sand at the test temperature of 1000 ℃ is 28.2ml/g, which is higher than that of pure quartz sand but far lower than that of pure limestone sand.
Putting 1000Kg of mixed raw sand into a sand mixer, adding 7% of bentonite and 3.2% of water, mixing well, and discharging sand for later use. And molding and pouring the ductile iron piece on a vertical parting molding line by using the mixed wet-mold mixed sand. The surface of the casting is easy to remove sand, and the casting has no defects (as shown in figure 2).
Example 3
Taking 2000Kg of quartz sand and 180Kg of limestone sand, and uniformly mixing in a sand mixer to produce sand, thus obtaining the mixed raw sand. The gas forming amount of the mixed raw sand at the test temperature of 1000 ℃ is 18.2ml/g, which is higher than that of pure quartz sand but far lower than that of pure limestone sand.
Putting 1000Kg of mixed raw sand into a sand mixer, adding 6% of water glass while mixing, and discharging sand for later use after mixing. Manually molding horizontally split water glass composite sand by mixing and blowing CO2And stripping after gas hardening, and pouring ZG45 steel castings after mold assembling. The surface of the casting is easy to remove sand, and the casting has no defects (as shown in figure 3).
Example 4
2000Kg of quartz sand and 320Kg of limestone sand are taken and mixed evenly in a sand mixer to produce sand, thus obtaining the mixed raw sand. The gas forming amount of the mixed raw sand at the test temperature of 1000 ℃ is 30.5ml/g, which is higher than that of pure quartz sand but far lower than that of pure limestone sand.
Putting 1000Kg of mixed raw sand into a sand mixer, adding 6.5% of water glass while mixing, and discharging sand for later use after mixing. Horizontally parting and shooting sand by using mixed water glass composite sand and blowing CO2And (4) stripping after gas hardening, and casting the ductile iron shell part after mould combination. The surface of the casting is easy to remove sand, and the casting has no defects (as shown in figure 4).
Claims (5)
1. The mixed raw sand is characterized by comprising quartz sand and limestone sand, wherein the weight ratio of the quartz sand to the limestone sand is as follows: (81-99.8)% (0.2-19)%, and the mixed raw sand is used for clay sand casting or sodium silicate sand casting.
2. The bonded raw sand according to claim 1, wherein the weight ratio of the quartz sand to the limestone sand is (81-98)% (2-19)%.
3. The compounded crude sand according to claim 1, wherein said limestone sand includes various fine particles made of a crushed rock-screen gradation based on limestone.
4. The blended raw sand of claim 1, wherein the particle size of the blended raw sand after being mixed and sieved is between 40 and 270 mesh.
5. The compounded virgin sand of claim 1, wherein said compounded virgin sand is used in the production of castings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111508259.3A CN114273603A (en) | 2021-12-10 | 2021-12-10 | A mixed raw sand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111508259.3A CN114273603A (en) | 2021-12-10 | 2021-12-10 | A mixed raw sand |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114273603A true CN114273603A (en) | 2022-04-05 |
Family
ID=80871684
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111508259.3A Pending CN114273603A (en) | 2021-12-10 | 2021-12-10 | A mixed raw sand |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114273603A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB854844A (en) * | 1958-07-16 | 1960-11-23 | Howard Floyd Taylor | Improvements in shell mold compositions |
| US20030111202A1 (en) * | 2001-08-07 | 2003-06-19 | Sparks Robert E. | Products for the manufacture of molds and cores used in metal casting and a method for their manufacture and recycle from crushed rock |
| CN101992258A (en) * | 2010-12-13 | 2011-03-30 | 杭州汽轮铸锻有限公司 | Composite foundry sand material for preventing foundry sand sintering in steel cast casting and preparation method thereof |
| CN105170876A (en) * | 2015-09-09 | 2015-12-23 | 重庆大学 | Water-glass sand and preparation and use methods thereof |
| CN105312485A (en) * | 2015-11-02 | 2016-02-10 | 广西博白县三田机械制造有限公司 | Molding sand for die casting |
| CN106111883A (en) * | 2016-08-18 | 2016-11-16 | 娄土岭 | A kind of multi-function casting moulding sand and manufacture method thereof |
-
2021
- 2021-12-10 CN CN202111508259.3A patent/CN114273603A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB854844A (en) * | 1958-07-16 | 1960-11-23 | Howard Floyd Taylor | Improvements in shell mold compositions |
| US20030111202A1 (en) * | 2001-08-07 | 2003-06-19 | Sparks Robert E. | Products for the manufacture of molds and cores used in metal casting and a method for their manufacture and recycle from crushed rock |
| CN101992258A (en) * | 2010-12-13 | 2011-03-30 | 杭州汽轮铸锻有限公司 | Composite foundry sand material for preventing foundry sand sintering in steel cast casting and preparation method thereof |
| CN105170876A (en) * | 2015-09-09 | 2015-12-23 | 重庆大学 | Water-glass sand and preparation and use methods thereof |
| CN105312485A (en) * | 2015-11-02 | 2016-02-10 | 广西博白县三田机械制造有限公司 | Molding sand for die casting |
| CN106111883A (en) * | 2016-08-18 | 2016-11-16 | 娄土岭 | A kind of multi-function casting moulding sand and manufacture method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 张明之等主编: "《产品快速制造技术实用教程》", 西安：西安交通大学出版社, pages: 7 - 4 * |
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