CN111331072A - Method for regenerating casting used sand and method for regenerating casting used sand by ultrasonic waves - Google Patents
Method for regenerating casting used sand and method for regenerating casting used sand by ultrasonic waves Download PDFInfo
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- CN111331072A CN111331072A CN202010284749.9A CN202010284749A CN111331072A CN 111331072 A CN111331072 A CN 111331072A CN 202010284749 A CN202010284749 A CN 202010284749A CN 111331072 A CN111331072 A CN 111331072A
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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
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Abstract
The invention relates to a method for regenerating used foundry sand by ultrasonic waves, which comprises the following steps: uniformly mixing the used sand and the silane coupling agent acid solution, adding the mixture into a mobile ultrasonic device for ultrasonic treatment, separating sand from water to obtain filtered water and wet sand, allowing the filtered water to enter a sewage tank, adding a flocculating agent into the sewage tank for sedimentation treatment, recycling supernatant, rinsing the wet sand with clear water, and drying the rinsed wet sand to obtain the regenerated casting used sand. The method can separately recover one sand mold and can also be mixed old sand of different sand molds, the applicability is wider, the ultrasonic equipment design ensures that the pulse energy can be transmitted, the quality of the sand particles is better, the acidic silane coupling agent solution not only plays the role of increasing the surface tension of the silane coupling agent and helping the separation of substances on the surface of the sand particles, but also ensures that the separated substances react with acid to produce salt which is dissolved in water and cannot cause impurities.
Description
Technical Field
The invention belongs to the technical field of recovery of used foundry sand, and particularly relates to a method for regenerating used foundry sand and regenerating used foundry sand by ultrasonic waves.
Background
The used casting sand is main industrial solid waste which accounts for about 70% of the solid casting waste, if the used casting sand is randomly discharged, the environment is polluted, and resources are wasted.
Although a plurality of research institutions at home and abroad research ultrasonic regeneration methods, most of the research institutions are limited, for example, patent CN106807883A discloses a method for regenerating used water glass sand by ultrasonic wet method, but only aims at the used water glass sand, a large amount of water is used for cleaning and eliminating residual substances on the surface, and the water consumption is too large, which is not beneficial to practical application. CN104399876A discloses a method for regenerating used sodium silicate sand by using ultrasonic technology, but it is also only for used sodium silicate sand, and it needs a large amount of alkali solution to soak before ultrasonic treatment, which is not favorable for practical application.
The prior art only treats a small amount of used sand, but in the actual production process, the sand grains can affect the absorption of ultrasonic waves and cannot be accumulated in a large amount, so that the ultrasonic energy only treats the sand grains at the nearest position. And the casting types are various, multiple kinds of sand can be mixed in the industry, and the application range is limited if only one kind of sand mold can be separately processed.
The present invention has been made in view of the above circumstances.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method for regenerating used foundry sand and ultrasonic wave regenerated used foundry sand.
The invention provides a method for regenerating used foundry sand by ultrasonic waves, which comprises the following steps: uniformly mixing the used sand and the silane coupling agent acid solution, adding the mixture into a mobile ultrasonic device for ultrasonic treatment, separating sand from water to obtain filtered water and wet sand, allowing the filtered water to enter a sewage tank, adding a flocculating agent into the sewage tank for sedimentation treatment, recycling supernatant, rinsing the wet sand with clear water, and drying the rinsed wet sand to obtain the regenerated casting used sand.
The method adopts ultrasonic treatment to convert sound energy into mechanical energy in liquid to form a cavitation effect, the cavitation effect causes bubbles in the solution to be formed, and blasting and compression are increased, so that solid matters are dispersed, the contact area of the solid matters is increased, the stripping of residual matters from the surface of sand grains is improved, and the effect of old sand regeneration is achieved.
The silane coupling agent has two functional groups, wherein, a silanol bond can form a hydrogen bond with hydroxyl on the surface of the silica sand, and simultaneously, the surface tension of the silica sand is increased, so that the substances on the surface of the silica sand fall off.
The acidic solution can increase the hydrolysis of the silane coupling agent and accelerate the action rate of the silane coupling agent, meanwhile, the acidic solution can react with alkaline substances remained on the surface of the used sand, and simultaneously, bubbles formed by ultrasonic waves enable the reaction rate to be higher.
Further, the silane coupling agent acidic solution is obtained by adding a silane coupling agent into acidic water with the pH value of 2-5, and the mass fraction of the silane coupling agent is 1-3%.
The silane coupling agent and the acid in the present invention are commercially available conventional raw materials.
Furthermore, the used sand is a single sand mold or a mixture of a plurality of different sand molds.
Furthermore, the mass ratio of the used sand to the silane coupling agent acid solution is 1: 0.5-2.
Furthermore, the ultrasonic equipment is a groove type device with a bottom wall and a side wall, and the bottom wall and the side wall are both provided with ultrasonic vibrators.
Furthermore, the vibration frequency of the ultrasonic equipment is 50-100 KHz.
Furthermore, the height of the sand-water mixture in the ultrasonic equipment is less than or equal to 50mm, and the vibration time is 1-3 min.
Further, the pH value of the sand after the wet sand is washed by clean water is less than 8.
Furthermore, the turbidity of the water subjected to sedimentation treatment in the sewage tank is less than 20 NTU.
Furthermore, the acid consumption value of the regenerated foundry used sand is less than or equal to 7 ml.
The invention also provides a method for preparing the reclaimed foundry used sand.
Compared with the prior art, the invention has the beneficial effects that:
(1) the method can independently recover one sand mold and can also be mixed old sand of different sand molds, and the obtained reclaimed sand can also be used on different sand molds, so that the applicability is wider, the design of ultrasonic equipment ensures that the height of a sand-water mixture is not higher than 50mm, the wave energy can be transmitted, the quality of sand grains is better, and the sand-water is in continuous rotation in a moving state in the treatment process, so that the yield can be ensured; the acidic silane coupling agent solution not only plays the role of increasing surface tension of the silane coupling agent and helping the substances on the surface of sand grains to separate, but also enables the separated substances to react with acid to generate salt which is dissolved in water and cannot cause impurities, although a few impurities are adhered to the surface of the sand grains after separation, after the sand water is separated, the sand also needs to be leached by clear water to remove the salt and the acid remained on the surface of the sand grains, filtered water is subjected to sedimentation treatment, the turbidity is lower than 20NTU, the acidic silane coupling agent solution can be recycled, water pollution is avoided, and water resource waste is reduced;
(2) the method can treat the used foundry sand by an ultrasonic wet method, eliminate the discharge of the used sand, reduce the pollution to the ecological environment, and simultaneously achieve the purposes of recycling and reducing the production cost by the reclaimed sand.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Example 1
The method for regenerating used foundry sand by ultrasonic waves comprises the following steps: uniformly mixing used sand and an acidic solution of a silane coupling agent, wherein the acidic solution of the silane coupling agent is obtained by adding the silane coupling agent into acidic water with the pH value of 2, the mass fraction of the silane coupling agent is 1%, the used sand is a single sand mold, the mass ratio of the used sand to the acidic solution of the silane coupling agent is 1:0.5, adding the sand mold into a mobile ultrasonic device for ultrasonic treatment, the ultrasonic device is a groove-type device with a bottom wall and a side wall, the bottom wall and the side wall are both provided with ultrasonic vibrators, the sand-water mixture is in a mobile state in the ultrasonic device, the vibration frequency of the ultrasonic device is 50KHz, the height of the sand-water mixture in the ultrasonic device is 50mm, the vibration time is 3min, the sand-water separation is carried out to obtain filtered water and wet sand, the pH value of the sand after the wet sand is subjected to clear water sprinkling is less than 8, and the filtered water enters a sewage tank, and adding a flocculating agent into the sewage tank for sedimentation treatment, recycling the supernatant, washing the wet sand with clear water, and drying the washed wet sand to obtain the regenerated used foundry sand, wherein the turbidity of the water subjected to sedimentation treatment in the sewage tank is less than 20NTU (NTU).
Example 2
The method for regenerating used foundry sand by ultrasonic waves comprises the following steps: uniformly mixing used sand and an acidic solution of a silane coupling agent, wherein the acidic solution of the silane coupling agent is obtained by adding the silane coupling agent into acidic water with the pH value of 4.5, the mass fraction of the silane coupling agent is 2%, the used sand is formed by mixing more than two sand moulds, the mass ratio of the used sand to the acidic solution of the silane coupling agent is 1:1.25, the used sand to the acidic solution of the silane coupling agent is added into a mobile ultrasonic device for ultrasonic treatment, the ultrasonic device is a groove-type device with a bottom wall and a side wall, both the bottom wall and the side wall are provided with ultrasonic vibrators, a sand-water mixture is in a mobile state in the ultrasonic device, the vibration frequency of the ultrasonic device is 75KHz, the height of the sand-water mixture in the ultrasonic device is 40mm, the vibration time is 1min, sand-water separation is carried out to obtain filtered water and wet sand, the pH value of the sand after the wet sand is subjected to rinsing, and (3) allowing the filtered water to enter a sewage tank, adding a flocculating agent into the sewage tank for sedimentation treatment, recycling the supernatant, washing the wet sand with clear water, and drying the washed wet sand to obtain the regenerated foundry used sand, wherein the turbidity of the water subjected to sedimentation treatment in the sewage tank is less than 20 NTU.
Example 3
The method for regenerating used foundry sand by ultrasonic waves comprises the following steps: uniformly mixing used sand and an acidic solution of a silane coupling agent, wherein the acidic solution of the silane coupling agent is obtained by adding the silane coupling agent into acidic water with the pH value of 5, the mass fraction of the silane coupling agent is 3%, the used sand is formed by mixing more than two sand moulds, the mass ratio of the used sand to the acidic solution of the silane coupling agent is 1:2, the used sand to the acidic solution of the silane coupling agent is added into a mobile ultrasonic device for ultrasonic treatment, the ultrasonic device is a groove-type device with a bottom wall and a side wall, the bottom wall and the side wall are both provided with ultrasonic vibrators, the sand-water mixture is in a mobile state in the ultrasonic device, the vibration frequency of the ultrasonic device is 100KHz, the height of the sand-water mixture in the ultrasonic device is 30mm, the vibration time is 2min, the sand-water is separated to obtain filtered water and wet sand, and the pH value of the sand after the wet sand is subjected to clear, and (3) allowing the filtered water to enter a sewage tank, adding a flocculating agent into the sewage tank for sedimentation treatment, recycling the supernatant, washing the wet sand with clear water, and drying the washed wet sand to obtain the regenerated foundry used sand, wherein the turbidity of the water subjected to sedimentation treatment in the sewage tank is less than 20 NTU.
Comparative example 1
The method of ultrasonically reclaiming used foundry sand of this comparative example was the same as in example 2, except that no silane coupling agent was added and only an acidic solution was used.
Comparative example 2
The method of ultrasonic reclamation of used foundry sand of this comparative example is the same as example 2, except that no acid is added, only a silane coupling agent is used, and the solution is neutral.
Comparative example 3
The method for regenerating used foundry sand by ultrasonic waves of this comparative example is the same as in example 2, except that the green sand is not rinsed with clear water.
Test example 1
The reclaimed foundry used sands prepared in examples 1 to 3 and comparative examples 1 to 3 were subjected to performance tests, respectively, and the results are shown in table 1.
TABLE 1
As can be seen from Table 1, the reclaimed foundry used sand prepared by the method of the invention has better performance, and the silane coupling agent, the acidic solution and the clear water have better effects.
The applicant has also carried out the above experiments on other examples, with substantially identical results, not listed one by one due to the limited space.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A method for regenerating used foundry sand by ultrasonic waves is characterized by comprising the following steps: uniformly mixing the used sand and the silane coupling agent acid solution, adding the mixture into a mobile ultrasonic device for ultrasonic treatment, separating sand from water to obtain filtered water and wet sand, allowing the filtered water to enter a sewage tank, adding a flocculating agent into the sewage tank for sedimentation treatment, recycling supernatant, rinsing the wet sand with clear water, and drying the rinsed wet sand to obtain the regenerated casting used sand.
2. The method for regenerating used foundry sand by ultrasonic waves as set forth in claim 1, wherein the acidic solution of the silane coupling agent is obtained by adding the silane coupling agent to acidic water having a pH of 2 to 5, and the silane coupling agent is present in an amount of 1 to 3% by mass.
3. The method for regenerating used foundry sand by ultrasonic waves according to claim 1 or 2, wherein the used sand is a single sand mold or a mixture of several different sand molds, and preferably, the mass ratio of the used sand to the acidic solution of the silane coupling agent is 1: 0.5-2.
4. The method of claim 1, wherein the ultrasonic equipment is a trough-type device having a bottom wall and side walls, and the bottom wall and the side walls are provided with ultrasonic vibrators.
5. A method for regenerating foundry used sand according to claim 1 or 4, wherein the vibration frequency of the ultrasonic equipment is 50-100 KHz.
6. The method for regenerating used foundry sand by ultrasonic waves according to claim 1, wherein the height of the sand-water mixture in the ultrasonic equipment is less than or equal to 50mm, and the vibration time is 1-3 min.
7. The method for regenerating used foundry sand by ultrasonic waves according to claim 1, wherein the pH value of the sand after the wet sand is washed with clean water is less than 8.
8. The method of claim 1, wherein the turbidity of the settled water in the lagoon is less than 20 NTU.
9. The method of claim 1, wherein the reclaimed foundry used sand has an acid consumption value of 7ml or less.
10. A reclaimed foundry used sand prepared by the method of any one of claims 1-9.
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| CN202010284749.9A CN111331072B (en) | 2020-04-13 | 2020-04-13 | Method for regenerating casting used sand and method for regenerating casting used sand by ultrasonic waves |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111702126A (en) * | 2020-07-08 | 2020-09-25 | 南阳仁创砂业科技有限公司 | Inorganic binder used sand mechanical wet regeneration device and method |
| CN112275996A (en) * | 2020-10-29 | 2021-01-29 | 盐城仁创砂业科技有限公司 | Regeneration method of sand for large steel casting and high-temperature-resistant precoated sand prepared from regenerated sand |
| CN112591933A (en) * | 2020-12-09 | 2021-04-02 | 南阳仁创再生资源有限公司 | Method for reducing conductivity of inorganic reclaimed sand |
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| CN104399876A (en) * | 2014-11-11 | 2015-03-11 | 天津众智科技有限公司 | Method utilizing ultrasonic technology to regenerate used sodium silicate sand |
| CN106001399A (en) * | 2016-05-26 | 2016-10-12 | 合肥市田源精铸有限公司 | Regeneration treatment method for sodium silicate waste sand |
| CN106064231A (en) * | 2016-05-26 | 2016-11-02 | 合肥市田源精铸有限公司 | A kind of regeneration treating method of furan resin self curing sand |
| CN106807882A (en) * | 2017-02-06 | 2017-06-09 | 柳州市柳晶科技有限公司 | Inorganic precoated sand antiquated sand regeneration decomposition helps liquid and antiquated sand renovation process |
| CN106807883A (en) * | 2017-04-13 | 2017-06-09 | 华中科技大学 | A kind of method of ultrasonic wave wet reclamation used sodium silicate sand |
| CN108723286A (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 regeneration method of the inorganic overlay film hygrometric state antiquated sand of silicates |
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2020
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104399876A (en) * | 2014-11-11 | 2015-03-11 | 天津众智科技有限公司 | Method utilizing ultrasonic technology to regenerate used sodium silicate sand |
| CN106001399A (en) * | 2016-05-26 | 2016-10-12 | 合肥市田源精铸有限公司 | Regeneration treatment method for sodium silicate waste sand |
| CN106064231A (en) * | 2016-05-26 | 2016-11-02 | 合肥市田源精铸有限公司 | A kind of regeneration treating method of furan resin self curing sand |
| CN106807882A (en) * | 2017-02-06 | 2017-06-09 | 柳州市柳晶科技有限公司 | Inorganic precoated sand antiquated sand regeneration decomposition helps liquid and antiquated sand renovation process |
| CN106807883A (en) * | 2017-04-13 | 2017-06-09 | 华中科技大学 | A kind of method of ultrasonic wave wet reclamation used sodium silicate sand |
| CN108723286A (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 regeneration method of the inorganic overlay film hygrometric state antiquated sand of silicates |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111702126A (en) * | 2020-07-08 | 2020-09-25 | 南阳仁创砂业科技有限公司 | Inorganic binder used sand mechanical wet regeneration device and method |
| CN112275996A (en) * | 2020-10-29 | 2021-01-29 | 盐城仁创砂业科技有限公司 | Regeneration method of sand for large steel casting and high-temperature-resistant precoated sand prepared from regenerated sand |
| CN112591933A (en) * | 2020-12-09 | 2021-04-02 | 南阳仁创再生资源有限公司 | Method for reducing conductivity of inorganic reclaimed sand |
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| CN111331072B (en) | 2021-05-25 |
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