CN108723286B - A kind of regeneration method of the inorganic overlay film hygrometric state antiquated sand of silicates - Google Patents
A kind of regeneration method of the inorganic overlay film hygrometric state antiquated sand of silicates Download PDFInfo
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- CN108723286B CN108723286B CN201810596229.4A CN201810596229A CN108723286B CN 108723286 B CN108723286 B CN 108723286B CN 201810596229 A CN201810596229 A CN 201810596229A CN 108723286 B CN108723286 B CN 108723286B
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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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- 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
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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
- B22C5/06—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
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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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Abstract
The invention belongs to die casting core material technical fields, specifically disclose a kind of regeneration method of inorganic overlay film hygrometric state antiquated sand of silicates, comprising the following steps: (1) then silicate antiquated sand is broken, screening carries out mill processing and multistage scouring；(2) it primary ultrasonic treatment: will be mixed to form water sand body with cleaning solution after the antiquated sand dust removal of pneumatic separation after scouring, antiquated sand: cleaning solution=1:1-2；Then it is once ultrasonically treated；(3) calcination process: the antiquated sand after primary ultrasonic treatment is separated with cleaning solution, and antiquated sand is put into roaster, roasting；(4) secondary mechanical is handled: the antiquated sand after roasting is milled, after multistage is cleaned, and dust removal of pneumatic separation；(5) twice ultrasonic is handled: the antiquated sand after centering dedusting carries out twice ultrasonic processing；(6) sand after twice ultrasonic is separated with waste water, is put into finished bin after sand drying and processing.Using the regeneration method of the technical program, the problem of silicates antiquated sand is difficult to regeneration can effectively solve the problem that.
Description
Technical field
The invention belongs to die casting core material technical field more particularly to a kind of inorganic overlay film hygrometric state of silicates are useless
The regeneration method of sand.
Background technique
Silicate is from a wealth of sources, cheap, non-toxic and tasteless as a kind of inorganic chemistry binder, is widely used at present
In casting industry.Traditional silicate binder substantially use single silicate be component (modulus be 1.6~2.8 it
Between) binder as casting sand, such silicate binder is mixed with roughing sand in type processed and blows two to core body again
Carbonoxide realizes solidification.With the development of modification technology, occur adding the cured novel silicon of organic ester into this kind of binder
Hydrochlorate binder develops to now with the silicate (modulus 1.6) of lower modulus for basic component, a variety of inorganic by adding
Salt and organics modifications, while using the inorganic powder curing accelerator with organic composite preparation with the use of cured completely new
Inorganic molding sand process and product.
Compared with organic resin binder, silicate binder is generated without toxic gas in application process, in environmental protection
Standard increasingly strict today, silicates molding sand are considered as the most possible molding sand type for realizing Green foundry.But silicon
Barbiturates molding sand there are problems that being difficult to regeneration, because the basic physical properties of silicate determine that the casting sand of its preparation exists
Casting and pouring roughing sand surface or between form the poly silicic acid of different condensation degree of dissolved and the alkali metal oxide that contains is brought
High-alkali problem cause silicate antiquated sand largely to be discharged, not only bring serious pollution to environment, also make this kind of cast waste sand
It is difficult to carry out the purpose that reuse is realized in regeneration treatment using the regeneration techniques method and equipment of usual cast waste sand, cause greatly
The wasting of resources.
Summary of the invention
The purpose of the present invention is to provide a kind of regeneration methods of the inorganic overlay film hygrometric state antiquated sand of silicates, to solve silicic acid
The problem of salt antiquated sand is difficult to regeneration, results in waste of resources.
In order to achieve the above object, base case of the invention are as follows: a kind of inorganic overlay film hygrometric state antiquated sand of silicates is again
Generation method, comprising the following steps:
(1) mechanical treatment: then silicate antiquated sand is broken, screening carries out mill processing and multistage scouring, cleans series
It is 3-12 grades；
(2) it primary ultrasonic treatment: to be formed being mixed after the antiquated sand dust removal of pneumatic separation after being cleaned in step (1) with cleaning solution
The mass parts ratio of water sand body, antiquated sand and cleaning solution is antiquated sand: cleaning solution=1:1-2；Then it is once ultrasonically treated, is handled
Time is 10-30min；
(3) calcination process: the antiquated sand after being once ultrasonically treated in step (2) is separated with cleaning solution, antiquated sand is put into roasting
Furnace, roasting, it is ensured that the temperature reached after antiquated sand heating puts sand after keeping the temperature 1-3h not less than 300 DEG C；
(4) secondary mechanical is handled: the antiquated sand after roasting in step (3) is milled, after multistage is cleaned, and dust removal of pneumatic separation；It mills
Time is 10-60s, and cleaning series is 3-9 grades；
(5) twice ultrasonic is handled: carrying out twice ultrasonic processing to the antiquated sand after dedusting in step (4)；
(6) sand after twice ultrasonic in step (5) is separated with waste water, is put into finished bin after sand drying and processing, waste liquid into
Enter processing pond recycling.
The beneficial effect of this base case is:
1, technical solution of the present invention is adapted for use with silicates, phosphoric acid salt, aluminum silicate and these are inorganic
Binder is independent or is modified the casting waste sand regeneration for the composite inorganic binder class being mixed with, and realizes silicates
The regeneration of inorganic overlay film hygrometric state antiquated sand, water consumption is few, and waste water can be recycled after simple settlement treatment；Treatment effect
It is good, it can be applied to precoated sand, resin sand etc., replace fresh sand to use completely or partially.
2, in the present invention, inorganic antiquated sand is ultrasonically treated, on the one hand can destroy the suction of silicate and sand grain surface
Attached effect, on the other hand cracks silicate surfaces, and bubble pierces crackle, reaches sand grain surface, makes silicic acid by vibration
Salt is detached from, and guarantees the regenerated effect of the inorganic antiquated sand of silicates.
3, antiquated sand is roasted, the temperature reached after heating is not less than 300 DEG C, and the adhesive film on antiquated sand surface is become by toughness
At brittleness, be conducive to remove adhesive film；And the sodium oxide molybdena and silica contained in silicate antiquated sand, sodium oxide molybdena and dioxy
SiClx has different expansion behaviors in identical temperature, is easy to fall off when cleaning after heat expansion, is conducive to remove adhesive film.
Further, in the step (1), by broken antiquated sand size controlling less than 4 mesh, water content control is being lower than
1.5‰；Add sand speed control in 15-50Kg/s when milling, the revolving speed for processing of milling is controlled in 50-200r/min, grinding time
30-90s；Mill processes are passed through wind, and ventilation quantity is controlled in 0-10000m3/min；Sand feeding amount control is in 30-140Kg/ when scouring
The revolving speed of min, scrub process are controlled in 1000-3000r/min.Water content in antiquated sand is excessively high to be unfavorable for removing adhesive film, control
Diameter of pelletizing is to more effectively mill；The residual of antiquated sand can within the above range bonded the state modulator of mechanical treatment
While film is sufficiently milled, avoid sand grains itself by excessive grinding, blowing is conducive to sandy mobile, makes as far as possible each
Sand can be ground sufficiently.
Further, add sand speed control in 20-30Kg/s when milling, the revolving speed for processing of milling is controlled in 80-160r/min,
40-60s when milling；Mill processes are passed through wind, and ventilation quantity is controlled in 1000-6000m3/min；The sand feeding amount of scrub process is
The revolving speed of 35-100Kg/min, scrub process are controlled in 1000-2000r/min.Applicant, will be mechanical by test of many times discovery
Within the above range, the effect of antiquated sand reclaiming is preferable for the state modulator of the antiquated sand of processing.
Further, the step (2) once ultrasonic treatment in, cleaning solution be containing concentration be 0.1-5% inorganic acid and
Concentration is the aqueous solution of the surfactant of 0.005-0.01%；The frequency of primary ultrasonic treatment ultrasonic wave is 28-48Hz, processing
Per kilogram antiquated sand ultrasonic intensity meets 0.1-0.5kw.Inorganic acid in cleaning solution can neutralize the Na in silicate2O and some
Sodium salt promotes silicate to dissolve in cleaning solution；There is hydrophilic radical in one end of surfactant, and has certain foaming energy
Power can enhance the cavitation of ultrasonic wave, be detached from silicate from sand grain surface.Applicant has found by test of many times, by one
Within the above range, the effect of ultrasonic treatment is preferable for the state modulator of secondary ultrasonic treatment.
Further, the frequency of a ultrasonic wave is 30-38Hz, and processing per kilogram antiquated sand ultrasonic intensity meets 0.1-
0.4kw.Applicant is by test of many times discovery, within the above range by the state modulator being once ultrasonically treated, the effect of processing
Preferably.
Further, the inorganic acid is using one of phosphoric acid or oxalic acid or the mixture of selection phosphoric acid and oxalic acid；
The surfactant is anionic surfactant.
Further, in step (3) calcination process, by the size controlling of antiquated sand to be roasted less than 6 mesh, antiquated sand
Flow control is in 20-80Kg/min；The temperature of roaster roast area is controlled at 400-500 DEG C, it is ensured that reach after antiquated sand heating
Temperature be not less than 300 DEG C, keep the temperature 1-2h after put sand.
The temperature of roast area is controlled at 400-500 DEG C, and by controlling the flow of antiquated sand, antiquated sand is by its surface when roast area
The bonding film temperature moment of package can be heated to 300 more to 400 DEG C, but at this time antiquated sand internal temperature be also not achieved it is so high
Temperature, when antiquated sand falls in roaster bottom, under the action of heat transmitting, the temperature of antiquated sand inside and outside each section at this time is left at 300 degree
The right side, by the multiple of applicant the study found that keeping the temperature 1-2h to antiquated sand at this temperature, the adhesive film on antiquated sand surface is by toughness
Become brittleness, is conducive to remove adhesive film；And the sodium oxide molybdena and silica contained in silicate antiquated sand, sodium oxide molybdena and two
Silica has different expansion behaviors in identical temperature, is easy to fall off, is conducive to except debanding when cleaning after heat expansion
Film.
Further, by the flow control of antiquated sand in 40-60Kg/min；The temperature of roaster roast area is controlled in 430-
470 DEG C, it is ensured that the temperature reached after antiquated sand heating puts sand after keeping the temperature 1.25h not less than 300 DEG C.Applicant passes through test of many times
It was found that within the above range by the temperature control of roasting, obtained resultant effect is preferable.
Further, the twice ultrasonic processing in the step (5) is that three ultrasounds are washed, sand and water in the washing of three ultrasounds
Mass parts ratio be respectively 1:1-2,1:1-1.5 and 2:1-1.25；The processing time is respectively 10- in the washing of three ultrasounds
30min, 5-20min and 3-10min.The washing of three ultrasounds by 3 continuous ultrasonic cleaning, gradually dissolve fine powder in sand and
The silicate of disengaging, the consumption acid value of sand is low after cleaning, and clay content is few.In three ultrasound water-washing process, sand water ratio is gradually to drop
Low, first is that making to can produce friction between sand grains, enhancing cleaning effect, second is that soluble matters in sand by improving sand water density
Gradually reducing reduces water demand, can save a part of water.
Specific embodiment
Raw material selection is illustrated below, and technical solution is further described by specific embodiment:
Inorganic acid is using one of phosphoric acid or oxalic acid or the mixture of selection phosphoric acid and oxalic acid in the present invention；This hair
Surfactant in bright is anionic surfactant, anionic surfactant select neopelex,
Any group of one of lauryl sodium sulfate or dodecyl benzene sulfonic acid ammonia or above-mentioned three kinds of anionic surfactant
It closes.
Embodiment 1
A kind of regeneration method of the inorganic overlay film hygrometric state antiquated sand of silicates, comprising the following steps:
(1) mechanical treatment: silicate antiquated sand is broken, screening by broken antiquated sand size controlling less than 4 mesh, contains
Water control is being lower than 1.5 ‰；Then mill processing and multistage scouring are carried out, cleaning series is 7 grades；Add sand speed control when milling
System is controlled in 25Kg/s, the revolving speed for processing of milling in 100r/min, grinding time 60s；Mill processes are passed through wind, ventilation quantity control
In 3000m3/min；Sand feeding amount control is controlled in 70Kg/min, the revolving speed of scrub process in 1500r/min when scouring.
(2) primary ultrasonic treatment: shape will be mixed with cleaning solution after the antiquated sand dust removal of pneumatic separation in step (1) after cleaning
At water sand body, the mass parts ratio of antiquated sand and cleaning solution is antiquated sand: cleaning solution=1:1.2；Then it is once ultrasonically treated, is surpassed
The frequency of sound wave is 28Hz, and processing per kilogram antiquated sand ultrasonic intensity meets 0.2kw；The processing time is 30min；The cleaning solution
It is the aqueous solution of the surfactant containing the inorganic acid that concentration is 1% mass ratio and 0.006%.
(3) calcination process: the antiquated sand in step (2) after being once ultrasonically treated is separated with cleaning solution, antiquated sand is put into roasting
Furnace roasting is burnt, the size controlling of antiquated sand to be roasted is less than 6 mesh, and the flow control of antiquated sand is in 40Kg/min；Roaster is roasted
The temperature for burning area is controlled at 400-500 DEG C, it is ensured that the temperature reached after antiquated sand heating puts sand after keeping the temperature 1.2h not less than 300 DEG C.
(4) secondary mechanical is handled: the antiquated sand after roasting in step (3) is milled, after multistage is cleaned, and dust removal of pneumatic separation；It mills
Time is 30s, and cleaning series is 6 grades；
(5) twice ultrasonic is handled: carrying out twice ultrasonic processing to the antiquated sand after dedusting in step (4)；Twice ultrasonic processing
It is washed for three ultrasounds, the mass parts ratio of sand and water is respectively 1:1.8,1:1.5 and 2:1.25 in the washing of three ultrasounds；Three
The processing time is respectively 30min, 20min and 10min in ultrasound washing.
(6) sand after twice ultrasonic in step (5) is separated with waste water, is put into finished bin after sand drying and processing, waste liquid into
Enter processing pond recycling.
Embodiment 2
A kind of regeneration method of the inorganic overlay film hygrometric state antiquated sand of silicates, comprising the following steps:
(1) mechanical treatment: silicate antiquated sand is broken, screening by broken antiquated sand size controlling less than 4 mesh, contains
Water control is being lower than 1 ‰；Then mill processing and multistage scouring are carried out, cleaning series is 7 grades；Add sand speed control when milling
It controls in the revolving speed of 35Kg/s, processing of milling in 120r/min, grinding time 60s；Mill processes are passed through wind, and ventilation quantity control exists
4000m3/min；Sand feeding amount control is controlled in 80Kg/min, the revolving speed of scrub process in 2000r/min when scouring.
(2) primary ultrasonic treatment: shape will be mixed with cleaning solution after the antiquated sand dust removal of pneumatic separation in step (1) after cleaning
At water sand body, the mass parts ratio of antiquated sand and cleaning solution is antiquated sand: cleaning solution=1:1.4；Then it is once ultrasonically treated, is surpassed
The frequency of sound wave is 32Hz, and processing per kilogram antiquated sand ultrasonic intensity meets 0.25kw；The processing time is 20min；The cleaning
Liquid is the aqueous solution of the surfactant containing the inorganic acid that concentration is 2% mass ratio and 0.008%.
(3) calcination process: the antiquated sand in step (2) after being once ultrasonically treated is separated with cleaning solution, antiquated sand is put into roasting
Furnace roasting is burnt, the size controlling of antiquated sand to be roasted is less than 6 mesh, and the flow control of antiquated sand is in 45Kg/min；Roaster is roasted
The temperature for burning area is controlled at 400-500 DEG C, it is ensured that the temperature reached after antiquated sand heating puts sand after keeping the temperature 1.2h not less than 300 DEG C.
(4) secondary mechanical is handled: the antiquated sand after roasting in step (3) is milled, after multistage is cleaned, and dust removal of pneumatic separation；It mills
Time is 30s, and cleaning series is 6 grades；
(5) twice ultrasonic is handled: carrying out twice ultrasonic processing to the antiquated sand after dedusting in step (4)；Twice ultrasonic processing
It is washed for three ultrasounds, the mass parts ratio of sand and water is respectively 1:1.6,1:1.3 and 2:1.2 in the washing of three ultrasounds；Three
The processing time is respectively 28min, 18min and 8min in ultrasound washing.
(6) sand after twice ultrasonic in step (5) is separated with waste water, is put into finished bin after sand drying and processing, waste liquid into
Enter processing pond recycling.
Embodiment 3
A kind of regeneration method of the inorganic overlay film hygrometric state antiquated sand of silicates, comprising the following steps:
(1) mechanical treatment: silicate antiquated sand is broken, screening by broken antiquated sand size controlling less than 4 mesh, contains
Water control is being lower than 1 ‰；Then mill processing and multistage scouring are carried out, cleaning series is 6 grades；Add sand speed control when milling
It controls in the revolving speed of 42Kg/s, processing of milling in 150r/min, grinding time 60s；Mill processes are passed through wind, and ventilation quantity control exists
4000m3/min；Sand feeding amount control is controlled in 100Kg/min, the revolving speed of scrub process in 2200r/min when scouring.
(2) primary ultrasonic treatment: shape will be mixed with cleaning solution after the antiquated sand dust removal of pneumatic separation in step (1) after cleaning
At water sand body, the mass parts ratio of antiquated sand and cleaning solution is antiquated sand: cleaning solution=1:1.8；Then it is once ultrasonically treated, is surpassed
The frequency of sound wave is 35Hz, and processing per kilogram antiquated sand ultrasonic intensity meets 0.28kw；The processing time is 20min；The cleaning
Liquid is the aqueous solution of the surfactant containing the inorganic acid that concentration is 4% mass ratio and 0.01%.
(3) calcination process: the antiquated sand in step (2) after being once ultrasonically treated is separated with cleaning solution, antiquated sand is put into roasting
Furnace roasting is burnt, the size controlling of antiquated sand to be roasted is less than 6 mesh, and the flow control of antiquated sand is in 60Kg/min；Roaster is roasted
The temperature for burning area is controlled at 400-500 DEG C, it is ensured that the temperature reached after antiquated sand heating puts sand after keeping the temperature 1h not less than 300 DEG C.
(4) secondary mechanical is handled: the antiquated sand after roasting in step (3) is milled, after multistage is cleaned, and dust removal of pneumatic separation；It mills
Time is 35s, and cleaning series is 6 grades；
(5) twice ultrasonic is handled: carrying out twice ultrasonic processing to the antiquated sand after dedusting in step (4)；Twice ultrasonic processing
It is washed for three ultrasounds, the mass parts ratio of sand and water is respectively 1:1.5,1:1.1 and 2:1 in the washing of three ultrasounds；Three surpass
The processing time is respectively 25min, 15min and 8min in sound washing.
(6) sand after twice ultrasonic in step (5) is separated with waste water, is put into finished bin after sand drying and processing, waste liquid into
Enter processing pond recycling.
Respectively to through embodiment 1-3 treated reclaimed sand and without the inorganic overlay film of silicates of any working process
The sour consumption value of sand hygrometric state antiquated sand, clay content, ph value etc. are detected, and table 1 is obtained:
Table 1
Analyze conclusion:
According to the data of table 1 it is found that the inorganic precoated sand hygrometric state of silicates handled by the present patent application technical solution
Antiquated sand, sour consumption value, clay content, pH value are useless well below the inorganic precoated sand hygrometric state of silicates without any working process
Sand, the use standard after meeting the inorganic precoated sand hygrometric state antiquated sand regeneration of silicates, can put into and reuse, be effectively reduced into
This.
Claims (8)
1. a kind of regeneration method of the inorganic overlay film hygrometric state antiquated sand of silicates, it is characterised in that: the following steps are included:
(1) mechanical treatment: silicate antiquated sand is broken, screening, by broken antiquated sand size controlling less than 4 mesh, water content
Control is being lower than 1.5 ‰；Then mill processing and multistage scouring are carried out, cleaning series is 3-12 grades；Add sand speed control when milling
System is controlled in 15-50Kg/s, the revolving speed for processing of milling in 50-200r/min, grinding time 30-90s；Mill processes are passed through wind,
Ventilation quantity is controlled in 0-10000m3Between/min, ventilation quantity is greater than 0m3/min；Sand feeding amount control is in 30-140Kg/ when scouring
The revolving speed of min, scrub process are controlled in 1000-3000r/min；
(2) it primary ultrasonic treatment: will be mixed to form water sand with cleaning solution after the antiquated sand dust removal of pneumatic separation after cleaning in step (1)
The mass parts ratio of body, antiquated sand and cleaning solution is antiquated sand: cleaning solution=1:1-2；Then it is once ultrasonically treated, handles the time
For 10-30min；
(3) calcination process: the antiquated sand after being once ultrasonically treated in step (2) is separated with cleaning solution, and antiquated sand is put into roaster, roasting
It burns, it is ensured that the temperature reached after antiquated sand heating puts sand after keeping the temperature 1-3h not less than 300 DEG C；
(4) secondary mechanical is handled: the antiquated sand after roasting in step (3) is milled, after multistage is cleaned, and dust removal of pneumatic separation；Grinding time
For 10-60s, cleaning series is 3-9 grades；
(5) twice ultrasonic is handled: carrying out twice ultrasonic processing to the antiquated sand after dedusting in step (4)；
(6) sand after twice ultrasonic in step (5) is separated with waste water, finished bin is put into after sand drying and processing, waste liquid enters place
Pond is managed to be recycled.
2. a kind of regeneration method of the inorganic overlay film hygrometric state antiquated sand of silicates according to claim 1, it is characterised in that: institute
It states in step (1), adds sand speed control in 20-30Kg/s when milling, the revolving speed control for processing of milling is ground in 80-160r/min
Consume time 40-60s；Mill processes are passed through wind, and ventilation quantity is controlled in 1000-6000m3/min；The sand feeding amount of scrub process is 35-
The revolving speed of 100Kg/min, scrub process are controlled in 1000-2000r/min.
3. a kind of regeneration method of the inorganic overlay film hygrometric state antiquated sand of silicates according to claim 1, it is characterised in that: institute
State step (2) once ultrasonic treatment in, cleaning solution be 0.1-5% containing mass concentration inorganic acid and mass concentration be
The aqueous solution of the surfactant of 0.005-0.01%；Processing per kilogram antiquated sand ultrasonic intensity meets 0.1-0.5kw.
4. a kind of regeneration method of the inorganic overlay film hygrometric state antiquated sand of silicates according to claim 3, it is characterised in that: place
Reason per kilogram antiquated sand ultrasonic intensity meets 0.1-0.4kw.
5. a kind of regeneration method of the inorganic overlay film hygrometric state antiquated sand of silicates according to claim 3, it is characterised in that: institute
Inorganic acid is stated using one of phosphoric acid or oxalic acid or the mixture of selection phosphoric acid and oxalic acid；The surfactant is yin
Ionic surfactant.
6. a kind of regeneration method of the inorganic overlay film hygrometric state antiquated sand of silicates according to claim 1-5, special
Sign is: in step (3) calcination process, by the size controlling of antiquated sand to be roasted less than 6 mesh, the flow control of antiquated sand
In 20-80Kg/min；The temperature of roaster roast area is controlled at 400-500 DEG C, it is ensured that the temperature reached after antiquated sand heating is not
Lower than 300 DEG C, sand is put after keeping the temperature 1-2h.
7. a kind of regeneration method of the inorganic overlay film hygrometric state antiquated sand of silicates according to claim 6, it is characterised in that: will
The flow control of antiquated sand is in 40-60Kg/min；The temperature of roaster roast area is controlled at 430-470 DEG C, it is ensured that antiquated sand heating
The temperature reached afterwards is not less than 300 DEG C, puts sand after keeping the temperature 1.25h.
8. a kind of regeneration method of the inorganic overlay film hygrometric state antiquated sand of silicates according to claim 1-5, special
Sign is: the twice ultrasonic processing in the step (5) is that three ultrasounds are washed, the mass parts of sand and water in the washing of three ultrasounds
Number is than being respectively 1:1-2,1:1-1.5 and 2:1-1.25；The processing time is respectively 10-30min, 5- in the washing of three ultrasounds
20min and 3-10min.
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| 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 |
| 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 |
| CN111496180B (en) * | 2020-06-17 | 2021-08-10 | 合肥仁创铸造材料有限公司 | Combined regeneration and reuse method for cast aluminum inorganic used sand |
| 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 |
| CN112275996B (en) * | 2020-10-29 | 2022-06-24 | 盐城仁创砂业科技有限公司 | Regeneration method of sand for large steel castings and high-temperature-resistant precoated sand prepared from regenerated sand |
| CN113926982B (en) * | 2021-10-15 | 2023-05-26 | 江西特欣实业有限公司 | Low-cost environment-friendly precoated sand and preparation method thereof |
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| JP5016016B2 (en) * | 2009-11-27 | 2012-09-05 | トヨタ自動車株式会社 | Surface-treated mold and manufacturing method thereof |
| KR101173053B1 (en) * | 2010-06-30 | 2012-08-13 | 현대자동차주식회사 | Separation system for binder of waste molding sand using ultrasonic |
| CN102000764A (en) * | 2010-12-17 | 2011-04-06 | 重庆长江造型材料（集团）有限公司 | Chemical regeneration method in casting waste sand disposing process |
| JP2014024097A (en) * | 2012-07-27 | 2014-02-06 | Asahi Tec Corp | Regeneration method of casting sand |
| CN105728641B (en) * | 2016-03-01 | 2018-03-13 | 潍柴动力股份有限公司 | Cast wet type mixing regenerating used method |
| 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 |
| CN107983907A (en) * | 2017-11-28 | 2018-05-04 | 合肥仁创铸造材料有限公司 | The method of recycling cast waste sand |
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