CN102688982A - Process for roasting waste sand into precoated sand material - Google Patents
Process for roasting waste sand into precoated sand material Download PDFInfo
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- CN102688982A CN102688982A CN2012101923363A CN201210192336A CN102688982A CN 102688982 A CN102688982 A CN 102688982A CN 2012101923363 A CN2012101923363 A CN 2012101923363A CN 201210192336 A CN201210192336 A CN 201210192336A CN 102688982 A CN102688982 A CN 102688982A
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Abstract
The invention relates to a process for roasting waste sand into a precoated sand material. The process comprises the steps of shakeout, magnetic separation, crushing, screening, magnetic separation, roasting, dedusting, cooling and storage. When crushed and magnetically separated sand is roasted, the sand is required to be fed into a preheater for preheating, and then is fed into a roasting furnace for roasting. A passage for bearing the sand is stepped when the sand is in the preheater, the sand in the stepped passage is in a flocculated flow state, and when the sand is roasted, natural gas is jetted from three direction-adjustable jet tips in the roasting furnace to process the sand. Before being roasted, the sand is required to be preheated, so that the high-temperature heat exchange time of the sand in the roasting furnace is short, and the roasting efficiency and the roasting quality are improved. The sand is roasted at high temperature by the natural gas, so that the generation of an inert gas during the roasting is avoided. In addition, the three adjustable natural gas jet tips are adopted, so that the sand can be uniformly heated when roasted.
Description
Technical field
The present invention relates to a kind of the antiquated sand roasting become the technology of precoated sand with material.
Background technology
Manufacturing industry is the pillar industry of China, and casting is the basic industry of equipment manufacture, but casting also is one of maximum industry of blowdown.Power consumption, the blowdown of the foundry goods of China's production at present are higher than industrially developed country far away.The qualified foundry goods of China every production 1t approximately will discharge dust 50kg, waste gas 1000～2000m
3, waste residue 300kg, antiquated sand 1.3～1.5t.Quantity maximum of antiquated sand wherein, this can't but be a huge waste, contains a large amount of pollutants in the old sand simultaneously; Comprising benzene class material, phenol, furans, α-Benzpyrene, NaOH, KOH etc., along with rain drop erosion, these harmful substances flow into the face of land; Destroy soil texture, cause the vegetation damage, constantly permeate the ground simultaneously; Polluted underground water cause permanent harm for Human's production, life, and the silica sand resource has been wasted greatly.
Present stage is mainly adopted the principle of thermal reclamation to the recycling of old sand, and through diesel oil or kerosene high-temperature roasting, the sand of again calcination process being crossed is made precoated sand and used with waste and old sand, and mainly there is following defective in prior art:
1, the sand that magnetic separation is intact is directly delivered to roasting in the roaster from apotheca in the prior art, and the warm in the middle of lacking makes the roasting time of sand in roaster long, influences the quality of roasting;
2, can produce inert gas with diesel oil or kerosene when the roasting, a large amount of inert gases that burning produces are discharged waste time and energy;
During 3, with diesel oil or kerosene roasting, burning mainly concentrates on a bit, and it is inhomogeneous to burn, bigger to the infringement of sand.
Summary of the invention
The technical problem that the present invention will solve is to overcome existing defective; Provide a kind of the antiquated sand roasting has been become the technology of precoated sand with material; Sand to being about to roasting carries out preheating, and the natural gas adjustable with spout carries out roasting to sand, makes the sand roasting even; Avoid the generation of inert gas, improved roasting regeneration chiltern amount.
In order to solve the problems of the technologies described above, the invention provides following technical scheme:
A kind of the antiquated sand roasting is become the technology of precoated sand with material; Comprise: knockout-magnetic separation-fragmentation-screening-magnetic separation-roasting-dedusting-cooling-storage; When the sand behind the crushing-magnetic selection is carried out roasting, need earlier sand sent into to send to after the preheater preheating again to carry out roasting in the roaster, in preheater; The passage that is used to carry sand is " ladder " shape, and sand is the wadding stream mode on " ladder " shape passage.
Further, when the sand after the preheating is carried out roasting, adopt natural gas to carry out roasting.
Further, natural gas carries out roasting from three inner ejiction opening ejections of roaster to sand.
Further, the direction that can adjust the gas spraying outlet comes sand is carried out roasting.
The present invention is a kind of to become the technology of precoated sand with material with the antiquated sand roasting, utilizes the thermal reclamation principle, before sand being carried out roasting, needs its preheating, makes the elevated temperature heat of sand in roaster short swap time like this, increases roasting efficient and has improved the quality of roasting.Waste and old core is passed through the natural gas high-temperature roasting; Avoided when roasting, producing inert gas; Sand is heated evenly when adopting a plurality of adjustable natural gas spouts to make roasting simultaneously; Become the sand mold that reclaimed sand can calcination process more the antiquated sand roasting with natural gas, but in all extensive uses of cold core, hot core and resin sand composite core technology, and can reach province's moral can effect.
The particle shape of sand is than fresh sand rounding more after roasting, and gas forming amount is lower than fresh sand, and burning decrement is low, and coefficient of thermal expansion reduces by 50% than fresh sand.The dihedral coefficient of sand reduces, and sand shape is good, forms semi-moon shaped resin-bonded bridge between the sand grains more easily, and sand surface impurity decomposes, and surface-active increases, and has improved the wettability between sand grains and the resinoid bond, has improved the intensity of precoated sand; In addition, sand is through behind the roast, and the gasification of impurity such as the mica that comprises in the sand, clay is decomposed, and burning makes the sand gas forming amount be lower than fresh sand of the same race.With the precoated sand that roasting sand is made into, in casting process, because phase transformation had taken place this part sand, linear expansion is less, so can prevent effectively that the vein defective from appearring in foundry goods.
The specific embodiment
Below the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for explanation and explains the present invention, and be not used in qualification the present invention.
The present invention is a kind of to become the technology of precoated sand with material with the antiquated sand roasting, mainly comprises the steps:
(1) waste and old core is fallen within on the magnetic separator through the knockout grid;
(2) isolate the iron block in the waste and old core through magnetic separator;
(3) the waste and old core after will separating is through the vibrations crusher in crushing;
(4) divide the iron granules that contains in the discrete shape sand once more with magnetic separator;
(5) send into storage sand storehouse with the sand in bulk of bucket elevator after with crushing and screening;
(6) send into preheater to sand with screw(-type) feeder and carry out preheating; Sand is in preheater, and the passage that is used to carry sand is " ladder " shape, and sand is the wadding stream mode on " ladder " shape passage; Straight up and down, can increase the preheating time of sand when avoiding sand like this in roaster;
(7) preheater is sent in the roasting body of heater after providing hot blast the sand preheating by roaster hearth; Through regulating natural gas valve and air hose valve, in the needed temperature range of precoated sand thermal reclamation, the sand in the roaster is under the pressure effect of stove bottom high pressure blower with the temperature maintenance in the stove; Become fluidised form and fluidized state to seesaw up and down; And sand is with between the sand, and sand impacts each other, rubs with the stove inside and outside wall, and surface coated organic resin film at high temperature is carbonized; Basically fully burnout; When sand was carried out roasting, natural gas carried out roasting from the adjustable ejiction opening ejection of three inner directions of roaster to sand, can make the natural gas roasting even like this;
(8) with air exhauster with ash content from going out;
(9) the high temperature regeneration sand flow of roasting completion is gone into heat exchanger, and heat exchanger makes the sand temperature drop of outflow low, and the high pressure wind-warm syndrome that bloats improves.Reclaimed sand after the heat exchange cooling stores after the coolelevator cooling promotes again, has been returned in the preheater by the high-pressure blast of preheating sand is carried out preheating.
What should explain at last is: the above is merely the preferred embodiments of the present invention; Be not limited to the present invention; Although the present invention has been carried out detailed explanation with reference to previous embodiment; For a person skilled in the art, it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. one kind becomes the technology of precoated sand with material with the antiquated sand roasting; Comprise: knockout-magnetic separation-fragmentation-screening-magnetic separation-roasting-dedusting-cooling-storage; It is characterized in that: when the sand behind the crushing-magnetic selection is carried out roasting, need earlier sand sent into to send to after the preheater preheating again to carry out roasting in the roaster, in preheater; The passage that is used to carry sand is " ladder " shape, and sand is the wadding stream mode on " ladder " shape passage.
2. according to claim 1ly a kind of the antiquated sand roasting is become the technology of precoated sand with material, it is characterized in that: when the sand after the preheating is carried out roasting, adopt natural gas to carry out roasting.
3. according to claim 2ly a kind of the antiquated sand roasting is become the technology of precoated sand with material, it is characterized in that: natural gas carries out roasting from three inner ejiction openings ejections of roaster to sand.
4. describedly a kind of the antiquated sand roasting is become the technology of precoated sand with material according to claim 2 or 3, it is characterized in that: the direction that can adjust the gas spraying outlet comes sand is carried out roasting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101923363A CN102688982A (en) | 2012-06-12 | 2012-06-12 | Process for roasting waste sand into precoated sand material |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101923363A CN102688982A (en) | 2012-06-12 | 2012-06-12 | Process for roasting waste sand into precoated sand material |
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| CN102688982A true CN102688982A (en) | 2012-09-26 |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102873269A (en) * | 2012-09-29 | 2013-01-16 | 温州市康霸洁具有限公司 | Resin gel waste core sand reproduction line |
| CN103894538A (en) * | 2014-04-24 | 2014-07-02 | 青岛大学 | Precoated sand hot-process regeneration equipment and regeneration method |
| CN105903897A (en) * | 2016-06-24 | 2016-08-31 | 洛阳凯林铸材有限公司 | Movable resin sand regeneration and lamination production line |
| CN105964900A (en) * | 2016-06-15 | 2016-09-28 | 安徽省含山县林头振皖铸造厂 | Casting precoated sand recycling technology |
| CN106607546A (en) * | 2016-08-31 | 2017-05-03 | 圣固（江苏）机械有限公司 | Coated sand recycling method |
| CN107649643A (en) * | 2017-09-11 | 2018-02-02 | 齐鲁工业大学 | A kind of regenerating used method of selective laser sintering mound precoated sand |
| CN108160916A (en) * | 2018-01-07 | 2018-06-15 | 甘肃北霖新材料科技有限公司 | A kind of method that special purpose high intensity precoated sand is prepared with Desert Sand |
| CN108326230A (en) * | 2018-03-26 | 2018-07-27 | 江苏翔晟重工有限公司 | A kind of reclamation technique |
| CN109500356A (en) * | 2018-12-25 | 2019-03-22 | 大连汇隆活塞股份有限公司 | A kind of processing method for preventing resin chrome ore from forming vein in casting process |
| CN110252943A (en) * | 2019-06-12 | 2019-09-20 | 南通凯斯辛普森机械科技有限公司 | Antiquated sand thermal reclamation equipment and antiquated sand thermal reclamation technique |
| CN110814276A (en) * | 2019-12-06 | 2020-02-21 | 马鞍山市绿科环保科技有限公司 | Method for cleaning impurities in casting waste sand |
| CN110935842A (en) * | 2019-10-18 | 2020-03-31 | 贵阳白云合金熔铸厂 | Precoated sand hot rubbing regeneration method and system |
| CN114042860A (en) * | 2021-11-29 | 2022-02-15 | 金耐源(河南)工业科技有限公司 | Low-emission environment-friendly casting mold material recycling process |
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| JPS5557350A (en) * | 1978-10-20 | 1980-04-28 | Taiheiyo Kinzoku Kk | Method and apparatus for regeneration of casting sand |
| JPS5725243A (en) * | 1980-07-19 | 1982-02-10 | Zenjiro Hokao | Method and device for regeneration of waste molding sand by flame jet |
| CN102009122A (en) * | 2010-12-09 | 2011-04-13 | 柳州市奥凯工程机械有限公司 | Waste foundry sand regenerating process method |
| CN102125982A (en) * | 2010-12-20 | 2011-07-20 | 重庆长江造型材料（集团）有限公司 | Full-counterflow heat exchange two-section type casting waste sand roasting furnace |
| CN201969827U (en) * | 2011-03-28 | 2011-09-14 | 刘正高 | Production line for roasting regeneration of resin waste sand |
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2012
- 2012-06-12 CN CN2012101923363A patent/CN102688982A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS5557350A (en) * | 1978-10-20 | 1980-04-28 | Taiheiyo Kinzoku Kk | Method and apparatus for regeneration of casting sand |
| JPS5725243A (en) * | 1980-07-19 | 1982-02-10 | Zenjiro Hokao | Method and device for regeneration of waste molding sand by flame jet |
| CN102009122A (en) * | 2010-12-09 | 2011-04-13 | 柳州市奥凯工程机械有限公司 | Waste foundry sand regenerating process method |
| CN102125982A (en) * | 2010-12-20 | 2011-07-20 | 重庆长江造型材料（集团）有限公司 | Full-counterflow heat exchange two-section type casting waste sand roasting furnace |
| CN201969827U (en) * | 2011-03-28 | 2011-09-14 | 刘正高 | Production line for roasting regeneration of resin waste sand |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102873269A (en) * | 2012-09-29 | 2013-01-16 | 温州市康霸洁具有限公司 | Resin gel waste core sand reproduction line |
| CN103894538A (en) * | 2014-04-24 | 2014-07-02 | 青岛大学 | Precoated sand hot-process regeneration equipment and regeneration method |
| CN103894538B (en) * | 2014-04-24 | 2015-11-18 | 青岛大学 | Precoated sand thermal reclamation equipment and renovation process thereof |
| CN105964900A (en) * | 2016-06-15 | 2016-09-28 | 安徽省含山县林头振皖铸造厂 | Casting precoated sand recycling technology |
| CN105903897A (en) * | 2016-06-24 | 2016-08-31 | 洛阳凯林铸材有限公司 | Movable resin sand regeneration and lamination production line |
| CN106607546A (en) * | 2016-08-31 | 2017-05-03 | 圣固（江苏）机械有限公司 | Coated sand recycling method |
| CN107649643B (en) * | 2017-09-11 | 2019-11-15 | 齐鲁工业大学 | A kind of regenerating used method of selective laser sintering mound precoated sand |
| CN107649643A (en) * | 2017-09-11 | 2018-02-02 | 齐鲁工业大学 | A kind of regenerating used method of selective laser sintering mound precoated sand |
| CN108160916A (en) * | 2018-01-07 | 2018-06-15 | 甘肃北霖新材料科技有限公司 | A kind of method that special purpose high intensity precoated sand is prepared with Desert Sand |
| CN108326230A (en) * | 2018-03-26 | 2018-07-27 | 江苏翔晟重工有限公司 | A kind of reclamation technique |
| CN109500356A (en) * | 2018-12-25 | 2019-03-22 | 大连汇隆活塞股份有限公司 | A kind of processing method for preventing resin chrome ore from forming vein in casting process |
| CN110252943A (en) * | 2019-06-12 | 2019-09-20 | 南通凯斯辛普森机械科技有限公司 | Antiquated sand thermal reclamation equipment and antiquated sand thermal reclamation technique |
| CN110935842A (en) * | 2019-10-18 | 2020-03-31 | 贵阳白云合金熔铸厂 | Precoated sand hot rubbing regeneration method and system |
| CN110814276A (en) * | 2019-12-06 | 2020-02-21 | 马鞍山市绿科环保科技有限公司 | Method for cleaning impurities in casting waste sand |
| CN114042860A (en) * | 2021-11-29 | 2022-02-15 | 金耐源(河南)工业科技有限公司 | Low-emission environment-friendly casting mold material recycling process |
| CN114042860B (en) * | 2021-11-29 | 2024-02-09 | 金耐源(河南)工业科技有限公司 | Low-emission environment-friendly casting mold material recycling process |
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Application publication date: 20120926 |