CN104399876A - Method utilizing ultrasonic technology to regenerate used sodium silicate sand - Google Patents
Method utilizing ultrasonic technology to regenerate used sodium silicate sand Download PDFInfo
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- CN104399876A CN104399876A CN201410632362.2A CN201410632362A CN104399876A CN 104399876 A CN104399876 A CN 104399876A CN 201410632362 A CN201410632362 A CN 201410632362A CN 104399876 A CN104399876 A CN 104399876A
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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 discloses a method utilizing an ultrasonic technology to regenerate used sodium silicate sand. The method comprises the following steps: soaking used sodium silicate sand in a prepared sodium hydroxide solution, then separating the sodium silicate sand from the sodium hydroxide solution, placing the soaked sodium silicate sand in clean water or an alkali solution with a mass concentration of 0 to 20%; then subjecting the solution to an ultrasonic treatment by ultrasonic waves with a frequency of 20 to 200 kHz, then separating the sodium silicate sand from the waste liquid so as to obtain sodium silicate sand and waste liquid containing waste residues; washing the obtained sodium silicate sand, and drying so as to obtain regenerated sodium silicate sand with a demoulding rate more than 95%. The provided method has the advantages of high regeneration demoulding rate, no pollution, and good usability of regenerated sand.
Description
Technical field
The present invention relates to a kind of method adopting ultrasonic technique recycled water glass sand.
Background technology
Water-glass sand has the advantages such as intensity is high, cost is low, technique is simple, odorlessness, environmental friendliness, energy consumption are low, casting quality is good, is the molding sand kind most possibly realizing Green foundry.China is as casting first big country, and the Steel Castings of more than 90% adopts water virus, annual generation used sodium silicate sand 6,000,000 ton-800 ten thousand tons.At present, used sodium silicate sand, except part reuse, substantially all adopts the mode process of landfill, has both wasted limited silica sand resource, and has turn increased cost of disposal, and severe contamination ecological environment.Therefore, develop efficient regenerating water-glass old sand new technology, realize the regeneration of water-glass sand, extremely urgent, be also the core realizing Green foundry.
At present, the regenerating water-glass old sand technology of industrial maturation has dry reclamation and wet reclamation two kinds.
Dry reclamation relies between old sand grain and hardware or between sand grains, mutual " collision friction " makes the remaining binder of old sand grain surface destroy, come off, thus makes old sand obtain regeneration, is simply easy to realization.Early stage regenerating device, based on collision, now gradually excessively to based on friction, has " collision-friction " two kinds of processes concurrently mostly.
Dry reclamation effect is by influence factors such as old sand heating temperature, waterglass addition, old sand water content, palingenesis power and old sand binding agent mechanical properties.Due under normal temperature condition, waterglass film is obdurability, is unfavorable for dry reclamation, therefore on this basis, is developed heating-dry reclamation and freezing-dry reclamation method.Result of study shows, used sodium silicate sand is carried out 120 DEG C of-200 DEG C of heating and can remove moisture on old sand grain in remaining binder, strengthen the demoulding effect of dry reclamation used sodium silicate sand; Research find residual ester be Ester cured used sodium silicate sand and dry reclamation sand up time thereof are shortened, again adhesion strength decline main cause; And used sodium silicate sand is carried out the heating of 320 DEG C more than-350 DEG C, the impact of residual ester and residual organic matter can be removed, strengthen up time and the adhesion strength again of Recycled sodium silicate bonded sand.Also someone studies and show that the preference temperature that Ester cured regenerating water-glass old sand heats is 300 DEG C-350 DEG C, Na
2o clearance can reach 50%, and more than 300 DEG C, clearance slows down.In used sodium silicate sand dry reclamation process, dedusting is also a very important problem, and the dust of reclaimed sand removes bad, remaining Na
2o can fall, thus greatly affects quality and the effect of reclaimed sand.
The theoretical foundation of wet reclamation is salt in used sodium silicate sand and remaining binder water soluble.Wet reclamation effect is by the impact of the factors such as recovery time, sand water ratio, regeneration technology, Strength regenerate peculiarity, the temperature of water, the heating temperature of old sand and waterglass addition.Old sand heating temperature is higher, and the solubility of remaining binder in water is lower, and wet reclamation is more difficult, and waterglass addition is higher, and binding agent residual on old sand is also more, obtain good regeneration effect more difficult.When thinking that sand water ratio is about 0.7: 1, rubbing action is better, time about when sand water is than 1: 2, and Na
2o clearance is the highest.The regeneration scouring time is longer, Na
2o clearance is higher, and front 3min clearance increases obviously, and increase slowly afterwards, he is by slower for its dissolution velocity owing to the remaining binder in sand grains pit or gap.
Because wet reclamation water consumption is comparatively large, regenerated sewage is strong basicity, and the sewage disposal in wet reclamation has just become one of key technology of wet reclamation.
By years of researches and exploration discovery, used sodium silicate sand dry reclamation demoulding rate is low, poor, and wet reclamation water consumption is large, difficulty, damp sand are dried the problems such as energy consumption is high and could not be solved completely.
Remove the method for used sodium silicate sand surface adhesive film with ultrasonic wave, find no document through retrieval and record.
Summary of the invention
The object of this invention is to provide a kind of regeneration demoulding rate high, pollution-free, the method for the employing ultrasonic technique recycled water glass sand that reclaimed sand availability is good.
When the present invention has used ultrasonic wave to propagate in media as well, due to the interaction of ultrasonic wave and medium, make the change of medium generation physics or chemistry, thus produce the effect of a series of mechanics, heat, electromagnetism and chemistry.The ultrasonic effect that ultrasonic wave is propagated generation by the present invention is in media as well applied to used sodium silicate sand surface and coheres removing of film, chemical method and Physical use, can obtain significant effect.
Ultrasonic wave coheres in the process of film and to produce and the ultrasonic effect utilized mainly comprises following 3 kinds removing used sodium silicate sand surface:
1. cavitation: when ultrasonic wave carries out transmission in the high frequency conversion of the compression stress of more than 20,000 times per second and decompression power interactivity in the alkali lye around used sodium silicate sand, countless cavitation bubble is formed and implosion rapidly fast, produces instantaneous high temperature, high pressure thus.Analyze theoretically, the cavitation bubble of explosion can produce the pressure and 11 more than 10,000psi, the high temperature of 000 DEG C, and can be rapidly to external radiation at the moment impact ripple of its explosion.The energy that single cavitation bubble discharges is very little, but there is each second millions of cavitation bubbles to burst simultaneously, the effect added up is strongly, and the film that coheres on used sodium silicate sand surface, in the used sodium silicate sand surface of surrounding, can peel off by the powerful impact force action of generation.
2. fuel factor: hyperacoustic frequency is high, energy is large, and by during alkali liquor absorption around used sodium silicate sand or can produce significant fuel factor when producing vibration, increasing waterglass coheres the solubility of film in alkali lye, and the removal efficiency of film is cohered in raising.
3. chemical effect: ultrasonic wave can accelerate the chemical reaction reducing modulus of water glass.Accompany with cavitation, ultrasonic wave can accelerate Na
2o+SiO
2→ Na
2siO
3carrying out, remove while cohering film, reduce and cohere the modulus of film, improve its solution degree.
The present invention adopts the method for ultrasonic technique recycled water glass sand, specifically comprises the following steps:
(1) preparing mass concentration is the sodium hydroxide solution of 5%-25%;
(2) be 1:1-2 by used sodium silicate sand and sodium hydroxide solution volume ratio, used sodium silicate sand put into the sodium hydroxide solution prepared, soak 2-48h under room temperature, be separated by water-glass sand after dipping, alkali lye recycles;
(3) water-glass sand after dipping in step (2) is placed on clear water or mass concentration is be greater than zero to be less than or equal in the alkali lye of 20%, frequency of utilization is the ultrasonic echography 5-60min of 20kHz-200kHz, wherein the mass ratio of water-glass sand and water is 1:1-5, and the mass ratio of used sodium silicate sand and alkali lye is 1:1-3;
(4) by the water-glass sand after ultrasonic in step (3) and waste liquid isolated by filtration, water-glass sand and the waste liquid containing waste residue is obtained.Water-glass sand is through washing post-drying, and obtain the reclaimed sand that demoulding rate is not less than 95%, the waste liquid containing waste residue is obtained waste residue and washings more after filtration, and waste residue is through CO
2blow and become the mixture of sodium carbonate and sodium metasilicate; Washings recycle.
Using the principle of ultrasonic wave demoulding identical with Ultrasonic Cleaning, is all based on cavitation.The sound wave (i.e. a kind of compression and expansion replace ripple) of high frequency (supersonic frequency), high strength is applied in liquid medium, liquid medium was open in the expansion stage of ripple, form bubble, and at the compression stage of ripple, bubble is instant exploding or implosion in a liquid, produce a kind of very effective impulsive force, this process is called as cavitation.
Analyze theoretically, the cavitation bubble of explosion can produce the high temperature of pressure more than 10000psi and 11000 DEG C, and can be rapidly to external radiation at moment impact ripple of its explosion.The energy that single cavitation bubble discharges is very little, but there is millions of cavitation bubbles to burst in each second simultaneously, strongly, produce powerful impulsive force is enough to the film that coheres on submergence used sodium silicate sand surface in media as well to peel off to the effect added up, and reaches the object of demoulding.
The present invention compared with prior art tool has the following advantages:
First ultrasonic wave to be propagated in media as well and the ultrasonic effect caused is applied on used sodium silicate sand demoulding, use lower cost can obtain the reclaimed sand that demoulding rate is not less than 95%, and substantially without three-protection design, there is no secondary environmental pollution, and waste residue can be used as industrial chemicals after treatment, produce secondary economic benefit, the regeneration cost of water-glass sand is reduced further, thus realizes the final purpose of Green foundry.Reclaimed sand can be used as 100% facing sand, need not add the casting effect that fresh sand can reach excellent.
Accompanying drawing explanation
Fig. 1 is the SEM shape appearance figure before water-glass sand regeneration, and before regeneration, old sand surface coverage one deck is cellular coheres film, and the exposed rate of sand grain surface is not higher than 10%.
Fig. 2 is the SEM shape appearance figure after the regeneration of embodiment 1 water-glass sand, and after regeneration, the exposed rate of sand grain surface reaches 99%.
Fig. 3 is the SEM shape appearance figure after the regeneration of embodiment 2 water-glass sand, and after regeneration, the exposed rate of sand grain surface reaches 98%.
Fig. 4 is the SEM shape appearance figure after the regeneration of embodiment 3 water-glass sand, and after regeneration, the exposed rate of sand grain surface reaches 99.5%.
Fig. 5 is the SEM shape appearance figure after the regeneration of embodiment 4 water-glass sand, and after regeneration, the exposed rate of sand grain surface reaches 99.5%.
Fig. 6 is the SEM shape appearance figure after the regeneration of embodiment 5 water-glass sand, and after regeneration, the exposed rate of sand grain surface reaches 99%.
Fig. 7 is the SEM shape appearance figure after the regeneration of embodiment 6 water-glass sand, and after regeneration, the exposed rate of sand grain surface reaches 98%.
Detailed description of the invention
Embodiment 1
(1) preparing mass concentration is the sodium hydroxide solution of 15%.
(2) be 1:1 by used sodium silicate sand and sodium hydroxide solution volume ratio, used sodium silicate sand is put into the sodium hydroxide solution prepared to flood, soak 16h under room temperature, be separated by water-glass sand after having flooded, adding quality in alkali lye is that the NaOH of 3% of alkali lye quality recycles.
(3) be placed in clear water by the used sodium silicate sand of dipping in step (2), frequency of utilization is the ultrasonic echography 25min of 25kHz, and the mass ratio of used sodium silicate sand and water is 1:2.
(4) by the water-glass sand after ultrasonic in step (3) and waste liquid isolated by filtration, water-glass sand, through washing post-drying, obtains the reclaimed sand of demoulding.Washes obtains waste residue and washings after filtration, and waste residue is through CO
2blow and become the mixture of sodium carbonate and sodium metasilicate, as the raw material of melting catalyst; Washings can recycle.
Pattern after the regeneration of its water-glass sand is shown in accompanying drawing 2.Na before and after regeneration
2o content and demoulding rate see attached list 1.
Embodiment 2
(1) preparing mass concentration is the sodium hydroxide solution of 5%.
(2) be 1:2 by used sodium silicate sand and sodium hydroxide solution volume ratio, used sodium silicate sand is put into the sodium hydroxide solution prepared to flood, soak 36h under room temperature, be separated by water-glass sand after having flooded, adding quality in alkali lye is that the NaOH of 1% of alkali lye quality recycles.
(3) used sodium silicate sand flooded in step (2) being placed on mass concentration is in the NaOH solution of 20%, and frequency of utilization is the ultrasonic echography 48min of 50kHz, and the mass ratio of used sodium silicate sand and water is 1:5.
(4) by the water-glass sand after ultrasonic in step (3) and waste liquid isolated by filtration, water-glass sand, through washing post-drying, obtains demoulding reclaimed sand.Washes obtains waste residue and washings after filtration, and waste residue is through CO
2blow and become the mixture of sodium carbonate and sodium metasilicate, as the raw material of melting catalyst; Washings can recycle.
Pattern after the regeneration of its water-glass sand is shown in accompanying drawing 3.Na before and after regeneration
2o content and demoulding rate see attached list 1.
Embodiment 3
(1) preparing mass concentration is the sodium hydroxide solution of 20%.
(2) be 1:1.2 by used sodium silicate sand and sodium hydroxide solution volume ratio, used sodium silicate sand is put into the sodium hydroxide solution prepared to flood, soak 24h under room temperature, be separated by water-glass sand after having flooded, adding quality in alkali lye is that the NaOH of 4% of alkali lye quality recycles.
(3) be placed in clear water by the used sodium silicate sand of dipping in step (2), frequency of utilization is the ultrasonic echography 5min of 150kHz, and the mass ratio of used sodium silicate sand and water is 1:1.
(4) by the water-glass sand after ultrasonic in step (3) and waste liquid isolated by filtration, water-glass sand, through washing post-drying, obtains the reclaimed sand of demoulding.Washes obtains waste residue and washings after filtration, and waste residue is through CO
2blow and become the mixture of sodium carbonate and sodium metasilicate, as the raw material of melting catalyst; Washings can recycle.
Pattern after the regeneration of its water-glass sand is shown in accompanying drawing 4.Na before and after regeneration
2o content and demoulding rate see attached list 1.
Embodiment 4
(1) preparing mass concentration is the sodium hydroxide solution of 25%.
(2) be 1:1 by used sodium silicate sand and sodium hydroxide solution volume ratio, used sodium silicate sand is put into the sodium hydroxide solution prepared to flood, soak 2h under room temperature, be separated by water-glass sand after having flooded, adding quality in alkali lye is that the NaOH of 5% of alkali lye quality recycles.
(3) used sodium silicate sand flooded in step (2) being placed on mass concentration is in the NaOH solution of 1%, and frequency of utilization is the ultrasonic echography 60min of 200kHz, and the mass ratio of used sodium silicate sand and alkali lye is 1:1.
(4) by the water-glass sand after ultrasonic in step (3) and waste liquid isolated by filtration, water-glass sand, through washing post-drying, obtains the reclaimed sand of demoulding.Washes obtains waste residue and washings after filtration, and waste residue is through CO
2blow and become the mixture of sodium carbonate and sodium metasilicate, as the raw material of melting catalyst; Washings can recycle.
Pattern after the regeneration of its water-glass sand is shown in accompanying drawing 5.Na before and after regeneration
2o content and demoulding rate see attached list 1.
Embodiment 5
(1) preparing mass concentration is the sodium hydroxide solution of 15%.
(2) be 1:1 by used sodium silicate sand and sodium hydroxide solution volume ratio, used sodium silicate sand is put into the sodium hydroxide solution prepared to flood, soak 16h under room temperature, be separated by water-glass sand after having flooded, adding quality in alkali lye is that the NaOH of 3% of alkali lye quality recycles.
(3) used sodium silicate sand flooded in step (2) being placed on mass concentration is in the NaOH solution of 10%, and frequency of utilization is the ultrasonic echography 5min of 20kHz, and the mass ratio of used sodium silicate sand and water is 1:3.
(4) by the water-glass sand after ultrasonic in step (3) and waste liquid isolated by filtration, water-glass sand, through washing post-drying, obtains the reclaimed sand of demoulding.Washes obtains waste residue and washings after filtration, and waste residue is through CO
2blow and become the mixture of sodium carbonate and sodium metasilicate, as the raw material of melting catalyst; Washings can recycle.
Pattern after the regeneration of its water-glass sand is shown in accompanying drawing 6.Na before and after regeneration
2o content and demoulding rate see attached list 1.
Embodiment 6
(1) preparing mass concentration is the sodium hydroxide solution of 10%.
(2) be 1:2 by used sodium silicate sand and sodium hydroxide solution volume ratio, used sodium silicate sand is put into the sodium hydroxide solution prepared to flood, soak 48h under room temperature, be separated by water-glass sand after having flooded, adding quality in alkali lye is that the NaOH of 2% of alkali lye quality recycles.
(3) used sodium silicate sand flooded in step (2) being placed on mass concentration is in the NaOH solution of 15%, and frequency of utilization is the ultrasonic echography 30min of 100kHz, and the mass ratio of used sodium silicate sand and water is 1:2.
(4) by the water-glass sand after ultrasonic in step (3) and waste liquid isolated by filtration, water-glass sand, through washing post-drying, obtains the reclaimed sand of demoulding.Washes obtains waste residue and washings after filtration, and waste residue is through CO
2blow and become the mixture of sodium carbonate and sodium metasilicate, as the raw material of melting catalyst; Washings can recycle.
Pattern after the regeneration of its water-glass sand is shown in accompanying drawing 7.Na before and after regeneration
2o content and demoulding rate see attached list 1.
Subordinate list 1
| Embodiment | Na 2Before O regeneration | Na 2After O regeneration | Demoulding rate |
| 1 | 5.34％ | 0.08％ | 98.5％ |
| 2 | 5.34％ | 0.13％ | 97.6％ |
| 3 | 5.34％ | 0.06％ | 98.9％ |
| 4 | 5.34％ | 0.05％ | 99.1％ |
| 5 | 5.34％ | 0.07％ | 98.7％ |
| 6 | 5.34％ | 0.11％ | 97.9％ |
Claims (1)
1. adopt a method for ultrasonic technique recycled water glass sand, it is characterized in that comprising the steps:
(1) preparing mass concentration is the sodium hydroxide solution of 5%-25%;
(2) be 1:1-2 by used sodium silicate sand and sodium hydroxide solution volume ratio, used sodium silicate sand put into the sodium hydroxide solution prepared, soak 2-48h under room temperature, be separated by water-glass sand after dipping, alkali lye recycles;
(3) water-glass sand after dipping in step (2) is placed on clear water or mass concentration is be greater than zero to be less than or equal in the alkali lye of 20%, frequency of utilization is the ultrasonic echography 5-60min of 20kHz-200kHz, wherein the mass ratio of water-glass sand and water is 1:1-5, and the mass ratio of used sodium silicate sand and alkali lye is 1:1-3;
(4) by the water-glass sand after ultrasonic in step (3) and waste liquid isolated by filtration, water-glass sand and the waste liquid containing waste residue is obtained.Water-glass sand is through washing post-drying, and obtain the reclaimed sand that demoulding rate is not less than 95%, the waste liquid containing waste residue is obtained waste residue and washings more after filtration, and waste residue is through CO
2blow and become the mixture of sodium carbonate and sodium metasilicate; Washings recycle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410632362.2A CN104399876B (en) | 2014-11-11 | The method using ultrasonic technique recycled water glass sand |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410632362.2A CN104399876B (en) | 2014-11-11 | The method using ultrasonic technique recycled water glass sand |
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| Publication Number | Publication Date |
|---|---|
| CN104399876A true CN104399876A (en) | 2015-03-11 |
| CN104399876B CN104399876B (en) | 2017-01-04 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN107282877A (en) * | 2017-07-25 | 2017-10-24 | 山东省科学院新材料研究所 | It is a kind of to regenerate the method for recycling sodium silicate sand |
| CN107470555A (en) * | 2017-08-02 | 2017-12-15 | 华中科技大学 | A kind of alkaline sewage recovery method of used sodium silicate sand wet reclamation |
| CN108580798A (en) * | 2018-06-11 | 2018-09-28 | 重庆长江造型材料（集团）股份有限公司 | A kind of recoverying and utilizing method of the inorganic overlay film hygrometric state antiquated sand of silicates |
| CN110640080A (en) * | 2019-09-09 | 2020-01-03 | 武汉纺织大学 | Waste water glass sand wet regeneration method without wastewater discharge |
| CN111331072A (en) * | 2020-04-13 | 2020-06-26 | 北京仁创砂业铸造材料有限公司 | Method for regenerating casting used sand and method for regenerating casting used sand by ultrasonic waves |
| CN111468673A (en) * | 2020-04-24 | 2020-07-31 | 南阳仁创砂业科技有限公司 | Regeneration method of used foundry sand |
| CN111515336A (en) * | 2020-04-21 | 2020-08-11 | 北京仁创砂业铸造材料有限公司 | Method for regenerating used sodium silicate sand |
| CN113695515A (en) * | 2020-05-21 | 2021-11-26 | 邓超 | Inorganic sand regeneration process method |
| CN114192740A (en) * | 2021-12-13 | 2022-03-18 | 马鞍山市绿科环保科技有限公司 | Method for regenerating solid waste in moisture-preserving mold sand molding process |
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| CN102974757A (en) * | 2012-12-12 | 2013-03-20 | 武汉纺织大学 | Combined treatment method for used water glass sand reclamation and reclamation treating liquid concentration |
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| 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 |
| 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 |
| CN106807883B (en) * | 2017-04-13 | 2019-03-05 | 华中科技大学 | A kind of method of ultrasonic wave wet reclamation used sodium silicate sand |
| CN107282877A (en) * | 2017-07-25 | 2017-10-24 | 山东省科学院新材料研究所 | It is a kind of to regenerate the method for recycling sodium silicate sand |
| CN107282877B (en) * | 2017-07-25 | 2018-09-28 | 山东省科学院新材料研究所 | A method of regeneration recycles sodium silicate sand |
| CN107470555A (en) * | 2017-08-02 | 2017-12-15 | 华中科技大学 | A kind of alkaline sewage recovery method of used sodium silicate sand wet reclamation |
| CN107470555B (en) * | 2017-08-02 | 2019-06-18 | 华中科技大学 | A kind of alkaline sewage recovery method of used sodium silicate sand wet reclamation |
| CN108580798A (en) * | 2018-06-11 | 2018-09-28 | 重庆长江造型材料（集团）股份有限公司 | A kind of recoverying and utilizing method of the inorganic overlay film hygrometric state antiquated sand of silicates |
| CN110640080A (en) * | 2019-09-09 | 2020-01-03 | 武汉纺织大学 | Waste water glass sand wet regeneration method without wastewater discharge |
| CN111331072A (en) * | 2020-04-13 | 2020-06-26 | 北京仁创砂业铸造材料有限公司 | Method for regenerating casting used sand and method for regenerating casting used sand by ultrasonic waves |
| CN111331072B (en) * | 2020-04-13 | 2021-05-25 | 北京仁创砂业铸造材料有限公司 | Method for regenerating casting used sand and method for regenerating casting used sand by ultrasonic waves |
| CN111515336A (en) * | 2020-04-21 | 2020-08-11 | 北京仁创砂业铸造材料有限公司 | Method for regenerating used sodium silicate sand |
| CN111515336B (en) * | 2020-04-21 | 2021-05-04 | 北京仁创砂业铸造材料有限公司 | Method for regenerating used sodium silicate sand |
| CN111468673A (en) * | 2020-04-24 | 2020-07-31 | 南阳仁创砂业科技有限公司 | Regeneration method of used foundry sand |
| CN111468673B (en) * | 2020-04-24 | 2021-06-25 | 南阳仁创砂业科技有限公司 | Regeneration method of used foundry sand |
| CN113695515A (en) * | 2020-05-21 | 2021-11-26 | 邓超 | Inorganic sand regeneration process method |
| CN114192740A (en) * | 2021-12-13 | 2022-03-18 | 马鞍山市绿科环保科技有限公司 | Method for regenerating solid waste in moisture-preserving mold sand molding process |
| CN114192740B (en) * | 2021-12-13 | 2023-09-08 | 马鞍山市绿科环保科技有限公司 | Method for regenerating solid waste in moisturizing sand molding process |
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