CN104399877B - A kind of method utilizing microwave highly efficient regeneration used sodium silicate sand - Google Patents
A kind of method utilizing microwave highly efficient regeneration used sodium silicate sand Download PDFInfo
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- CN104399877B CN104399877B CN201410632442.8A CN201410632442A CN104399877B CN 104399877 B CN104399877 B CN 104399877B CN 201410632442 A CN201410632442 A CN 201410632442A CN 104399877 B CN104399877 B CN 104399877B
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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
- B22C5/18—Plants for preparing mould materials
- B22C5/185—Plants for preparing mould materials comprising a wet reclamation step
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- Mechanical Engineering (AREA)
- Processing Of Solid Wastes (AREA)
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Abstract
A kind of utilize microwave highly efficient regeneration used sodium silicate sand method be will broken after used sodium silicate sand and sodium hydroxide solution be sequentially added into microwave reaction kettle, being uniformly mixed, the mass ratio that wherein used sodium silicate sand and sodium hydroxide solution add is 1:0.5-1.5；Utilizing microwave that microwave reaction kettle is warming up to 100-200 DEG C, programming rate is 5-30 DEG C/min, and the reacted water-glass sand of constant temperature 5-90min filters with alkali liquor and separates, and the scrubbed post-drying of water-glass sand obtains reclaimed sand.It is high that the present invention has demoulding rate, pollution-free, the advantage that reclaimed sand availability is good.
Description
Technical field
The present invention relates to a kind of method utilizing microwave highly efficient regeneration used sodium silicate sand.
Background technology
Water-glass sand has intensity height, low cost, technique is simple, odorlessness, environmental friendliness, energy consumption are low, foundry goods matter
The advantages such as amount is good, are the molding sand kinds most possibly realizing Green foundry.China as casting the first big country, 90% with
On Steel Castings use water virus, annual produce used sodium silicate sand 6,000,000 tons～8,000,000 tons.At present,
Used sodium silicate sand, in addition to part reuse, the most all uses the mode of landfill to process, and has both wasted limited silica sand resource,
Add again cost of disposal, and severe contamination ecological environment.Therefore, the new skill of efficient regenerating water-glass old sand is developed
Art, it is achieved the regeneration of water-glass sand, extremely the most urgent, also it is the core realizing Green foundry.
The renovation process of industrial used sodium silicate sand generally uses dry reclamation and wet reclamation two kinds.
Dry reclamation relies between old sand grain and hardware or between sand grains, " collision friction " makes old sand grain surface mutually
Residual adhesive destroys, comes off, so that old sand obtains regeneration, is simply easily achieved.In early days regenerating device with
Collision is main, the most excessively to based on friction, mostly has " collision-friction " two kinds of processes concurrently.
Dry reclamation effect is by old sand heating temperature, waterglass addition, old sand water content, regeneration power and old sand
The influence factors such as adhesive mechanical property.Owing to, under normal temperature condition, waterglass film is obdurability, is unfavorable for dry reclamation,
Therefore on this basis, be developed and add Hot dry reclamation and freeze drying renovation process.Result of study shows,
Used sodium silicate sand is carried out 120 DEG C-200 DEG C moisture heated on removable old sand grain in Residual adhesive, strengthens dry
The demoulding effect of method recycled water glass sand；Research finds that residual ester is to make Ester cured used sodium silicate sand and dry reclamation thereof
The main cause that the sand up time shortens, bond strength declines again；And used sodium silicate sand is carried out 320 DEG C-350 DEG C
Above heating, removable residual ester and the impact of residual organic matter, strengthen Recycled sodium silicate bonded sand up time and
Bond strength again.Also someone study draw the preference temperature that Ester cured regenerating water-glass old sand heats be 300 DEG C-
350 DEG C, Na2O clearance can reach 50%, and more than 300 DEG C, clearance slows down.Used sodium silicate sand dry reclamation process
In, dedusting is also a highly important problem, and the dust of reclaimed sand removes bad, remaining Na2O fall is not got off, from
And largely effect on quality and the effect of reclaimed sand.
The theoretical basis of wet reclamation is the salt in used sodium silicate sand and Residual adhesive water soluble.Wet reclamation is imitated
Fruit is by recovery time, sand water ratio, regeneration technology, regeneration intensity, the temperature of water, the heating temperature of old sand and waterglass
The impact of the factors such as addition.Old sand heating temperature is the highest, and Residual adhesive dissolubility in water is the lowest, wet method
Regenerating the most difficult, and waterglass addition is the highest, on old sand, the adhesive of residual is the most, will obtain good regeneration
Effect is just more difficult to.Think that, when sand water is than about 0.7: 1, rubbing action is preferable, when sand water than 1: 2 time about time,
Na2O clearance is the highest.The regeneration scouring time is the longest, Na2O clearance is the highest, and front 3min clearance increases substantially,
Increasing slowly afterwards, he is slower owing to the dissolution velocity of the Residual adhesive in sand grains pit or gap by it.
Owing to wet reclamation water consumption is relatively big, regenerated sewage is strong basicity, and the sewage disposal in wet reclamation has just become wet
One of key technology of method regeneration.
By years of researches and exploration discovery, used sodium silicate sand dry reclamation demoulding rate is low, reclaimed sand poor availability,
Wet reclamation water consumption is big, waste water treatmentntrol difficult, damp sand are dried the problems such as energy consumption is high and could not be fully solved.
Summary of the invention
It is an object of the invention to provide a kind of demoulding rate high, pollution-free, what reclaimed sand availability was good utilizes microwave method to regenerate
The method of used sodium silicate sand.
Regeneration methods of the invention, specifically includes following steps:
(1) compound concentration is the sodium hydroxide solution of 0.5M-5M；
(2) used sodium silicate sand and sodium hydroxide solution after crushing are sequentially added into microwave reaction kettle, stir
Mixing mix homogeneously, the mass ratio that wherein used sodium silicate sand and sodium hydroxide solution add is 1:0.5-1.5；
(3) utilizing microwave, microwave reaction kettle is warming up to 100-200 DEG C, programming rate is 5-30 DEG C/min,
Constant temperature 5-90min；
(4) reacted water-glass sand in step (3) is separated with alkali liquor filtration, the scrubbed post-drying of water-glass sand,
Obtaining reclaimed sand, recycle of alkali liquor recycles.
Microwave is that a kind of very high frequency (generally between 300-300000MHz), wavelength are the shortest (generally 1
Between-1000mm) electromagnetic wave, be a kind of energy (rather than heat) form, but can convert in media as well
For heat.
Medium is divided into electrodeless and polar molecule electrolyte from electricity structure.Generally they random arrangements, as put them
In the electric field of alternation, the polar molecule orientation of these media can change with the change of electric polarity, cries polarization.Outward
Electric field is the strongest, and polarization is the strongest, and external electric field change in polarity is the fastest, polarizes the fastest, the warm-up movement of molecule and adjacent point
Rubbing action between son is the most violent.
Used sodium silicate sand after immersion, absorption large quantity of moisture in film is cohered on surface, after hydrone absorbs microwave energy,
Arrange in directivity under the effect of microwave, change its original molecular structure.When direction of an electric field changes,
Hydrone does electric polarity motion the most at a same speed, causes the rotation of molecule, causes intermolecular frequent impact to be produced
Give birth to substantial amounts of frictional heat.Owing to microwave has high frequency characteristics, it carries out the cycle with the surprising speed of billions of times per second
Change, thus cause material temperature at short notice to raise rapidly, simultaneously because intermolecular rubbing action, cause water
Peeling and the removing of film is cohered on glass sand surface.
The present invention compared with prior art has the advantage that
Film, demoulding rate 100% are cohered in microwave method removing used sodium silicate sand surface, can also remove molding sand table in de-filming process
Other impurity elements in face so that the silicone content of molding sand improves to more than 99%, obtains more higher type than fresh sand silicone content
Sand.
Microwave method is applied to casting sand surface waterglass and coheres the removing of film, while heating, due to intermolecular
Rubbing action, it is possible to accelerate surface and cohere the peeling of film so that waterglass coheres film while dissolving with peeling off,
Demoulding efficiency is greatly improved.
Accompanying drawing explanation
Fig. 1 is the SEM shape appearance figure before regenerating water-glass old sand, and before regeneration, old sand surface covering one layer is cellular coheres
Film, 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
99.5%.
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 99%.
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 98%.
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%.
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
99.5%.
Detailed description of the invention
Embodiment 1
(1) it is the sodium hydroxide solution of 2M with volumetric flask compound concentration.
(2) water-glass sand and sodium hydroxide solution after crushing are sequentially added into microwave reaction kettle, use glass
Glass rod is uniformly mixed.The two adds mass ratio is 1:1.2.
(3) by microwave reaction kettle temperature programming to 200 DEG C, programming rate is 15 DEG C/min, constant temperature 60min.
(4) reacted water-glass sand in step (3) is separated with alkali liquor filtration, the scrubbed post-drying of water-glass sand,
Obtain color and connect subalbous reclaimed sand.
Pattern after the regeneration of its water-glass sand is shown in accompanying drawing 2.Na before and after regeneration2O and SiO2Content and demoulding rate see attached list 1.
Embodiment 2
(1) it is the sodium hydroxide solution of 5M with volumetric flask compound concentration.
(2) water-glass sand and sodium hydroxide solution after crushing are sequentially added into microwave reaction kettle, use glass
Glass rod is uniformly mixed.The two adds mass ratio is 1:0.5.
(3) by microwave reaction kettle temperature programming to 100 DEG C, programming rate is 5 DEG C/min, constant temperature 30min.
(4) reacted water-glass sand in step (3) is separated with alkali liquor filtration, the scrubbed post-drying of water-glass sand,
Obtain color and connect subalbous reclaimed sand.
Pattern after the regeneration of its water-glass sand is shown in accompanying drawing 3.Na before and after regeneration2O and SiO2Content and demoulding rate see attached list 1.
Embodiment 3
(1) it is the sodium hydroxide solution of 0.5M with volumetric flask compound concentration.
(2) water-glass sand and sodium hydroxide solution after crushing are sequentially added into microwave reaction kettle, use glass
Glass rod is uniformly mixed.The two adds mass ratio is 1:1.
(3) by microwave reaction kettle temperature programming to 150 DEG C, programming rate is 10 DEG C/min, constant temperature 30min.
(4) reacted water-glass sand in step (3) is separated with alkali liquor filtration, the scrubbed post-drying of water-glass sand,
Obtain color and connect subalbous reclaimed sand.
Pattern after the regeneration of its water-glass sand is shown in accompanying drawing 4.Na before and after regeneration2O and SiO2Content and demoulding rate see attached list 1.
Embodiment 4
(1) it is the sodium hydroxide solution of 1M with volumetric flask compound concentration.
(2) water-glass sand and sodium hydroxide solution after crushing are sequentially added into microwave reaction kettle, use glass
Glass rod is uniformly mixed.The two adds mass ratio is 1:1.5.
(3) by microwave reaction kettle temperature programming to 180 DEG C, programming rate is 20 DEG C/min, constant temperature 10min.
(4) reacted water-glass sand in step (3) is separated with alkali liquor filtration, the scrubbed post-drying of water-glass sand,
Obtain color and connect subalbous reclaimed sand.
Pattern after the regeneration of its water-glass sand is shown in accompanying drawing 5.Na before and after regeneration2O and SiO2Content and demoulding rate see attached list 1.
Example 5
(1) it is the sodium hydroxide solution of 1.5M with volumetric flask compound concentration.
(2) water-glass sand and sodium hydroxide solution after crushing are sequentially added into microwave reaction kettle, use glass
Glass rod is uniformly mixed.The two adds mass ratio is 1:1.5.
(3) by microwave reaction kettle temperature programming to 120 DEG C, programming rate is 30 DEG C/min, constant temperature 5min.
(4) reacted water-glass sand in step (3) is separated with alkali liquor filtration, the scrubbed post-drying of water-glass sand,
Obtain color and connect subalbous reclaimed sand.
Pattern after the regeneration of its water-glass sand is shown in accompanying drawing 6.Na before and after regeneration2O and SiO2Content and demoulding rate see attached list 1.
Subordinate list 1
Claims (1)
1. the method utilizing microwave highly efficient regeneration used sodium silicate sand, it is characterised in that comprise the steps:
(1) compound concentration is the sodium hydroxide solution of 0.5M-5M；
(2) used sodium silicate sand and sodium hydroxide solution after crushing are sequentially added into microwave reaction kettle,
Being uniformly mixed, the mass ratio that wherein used sodium silicate sand and sodium hydroxide solution add is 1:0.5-1.5；
(3) utilizing microwave, microwave reaction kettle is warming up to 100-200 DEG C, programming rate is 5-30 DEG C/min,
Constant temperature 5-90min；
(4) reacted water-glass sand in step (3) is separated, after water-glass sand is scrubbed with alkali liquor filtration
Drying, obtain reclaimed sand, recycle of alkali liquor recycles.
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| CN201410632442.8A CN104399877B (en) | 2014-11-11 | 2014-11-11 | A kind of method utilizing microwave highly efficient regeneration used sodium silicate sand |
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| CN104399877B true CN104399877B (en) | 2016-12-07 |
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| 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 |
| CN110640080A (en) * | 2019-09-09 | 2020-01-03 | 武汉纺织大学 | Waste water glass sand wet regeneration method without wastewater discharge |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS53118224A (en) * | 1977-03-25 | 1978-10-16 | Mitsubishi Heavy Ind Ltd | Method of regenerating casting old sand |
| CN1323779C (en) * | 2002-09-13 | 2007-07-04 | 李明星 | Renovation and reclamation process for silicate-bonded sand |
| CN100586684C (en) * | 2008-10-24 | 2010-02-03 | 华中科技大学 | Microwave heating method for water glass sand mold or sand core |
| CN102527929A (en) * | 2012-01-16 | 2012-07-04 | 卢记军 | Reclamation method of used sodium silicate sand |
| CN102974757B (en) * | 2012-12-12 | 2015-05-20 | 武汉纺织大学 | Combined treatment method for used water glass sand reclamation and reclamation treating liquid concentration |
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