CN103406490B - Recycling cast waste sand reuse method and equipment - Google Patents
Recycling cast waste sand reuse method and equipment Download PDFInfo
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- CN103406490B CN103406490B CN201310281323.8A CN201310281323A CN103406490B CN 103406490 B CN103406490 B CN 103406490B CN 201310281323 A CN201310281323 A CN 201310281323A CN 103406490 B CN103406490 B CN 103406490B
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- 239000004576 sand Substances 0.000 title claims abstract description 288
- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000002699 waste material Substances 0.000 title claims abstract description 25
- 238000004064 recycling Methods 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 64
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 34
- 238000001035 drying Methods 0.000 claims abstract description 33
- 239000006148 magnetic separator Substances 0.000 claims abstract description 28
- 230000008569 process Effects 0.000 claims abstract description 22
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- 238000004140 cleaning Methods 0.000 claims abstract description 21
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 6
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- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 5
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- Processing Of Solid Wastes (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
A kind of recycling cast waste sand reuse method, comprise the following steps: the pre-treatment of antiquated sand: former antiquated sand removes waste and old rubbish by closed grid unloader, then through suspended magnetic separator removing scrap iron, again through linear vibrating screen removing bulky grain antiquated sand, finally by through magnetic separator removing waste iron filing, enter antiquated sand storage tank and deposit; The cleaning of antiquated sand: the antiquated sand through pre-treatment is conveyed into cleaning area by sand pump, first passes into sand water separator and removes portion of water, then enters and cleans combination cylinder scouring, by buffering concentration tank sedimentation concentration, eventually passes dewatering screen and sloughs portion of water; Dry: antiquated sand goes low temperature drying or high-temperature roasting after above-mentioned process, obtains reclaimed sand, puts into reclaimed sand tank storage and deposits; The aluminum coated steel of reclaimed sand: the reclaimed sand of metering is heated to uniform temperature by heater, together puts into precoated sand mixer with adhesive, stirs, be cooled to normal temperature, obtain precoated sand, puts into finished sand storage bucket.
Description
Technical field
The present invention relates to a kind of recycling cast waste sand recovery method, is the method that the useless sand reclamation produced by foundry industry is recycled, the open equally equipment for antiquated sand regeneration of the present invention.
Background technology
Since two thousand, the average speedup of China's casting industry, all more than 10%, becomes global maximum castings production state.Within 2011, China's casting output has broken through 4,000 ten thousand tons, occupies first place in the world.Sand casting is the basic technology in Foundry Production, and in casting industry, the foundry goods of about 90% is the explained hereafter adopting sand casting.Manufacture one ton of qualified foundry goods, approximately need the sand mold of a ton.The basic raw material manufacturing sand mold is casting model powder and moulding sand binder, and the most frequently used casting model powder is siliceous sand.The casting industry of China needs the siliceous sand of more than 4,000 ten thousand tons every year.A large amount of siliceous sands derives from nature, but along with the development of Building Trade in China and the construction of infrastructure also need a large amount of sand, cause natural sand resource fewer and feweri, the cost of exploitation is more and more higher, in order to the sustainable development of casting industry, the antiquated sand of rear generation made by necessary recycling foundry goods.The renovation process of antiquated sand has thermal reclamation, wet reclamation and mechanical friction regeneration etc., in order to obtain reclaimed sand of fine quality, general adopts thermal reclamation and mechanical friction to regenerate to combine or wet reclamation regenerates with mechanical friction and combines.In the production process of reclaimed sand, the collocation between the selection of renovation process and equipment is very crucial to the continuity of the quality of reclaimed sand and production, stationarity.
We know, no matter foundry industry molding sand used is precoated sand or resin sand, be all adopt Organic adhesive as the forming agent of sand, foundry goods is in casting process, and hot environment can make Organic adhesive pyrolysis carbonization, produce complicated material, these materials firmly can be adsorbed on the surface of gravel, if such antiquated sand adopts merely mechanical method of reproduction, the impurity on antiquated sand surface is difficult to remove, the reclaimed sand poor quality obtained, can not be applied to the intricate casting that dimension precision requirement is higher.
The regeneration recoverying and utilizing method of antiquated sand has report, as number of patent application: CN201210361378.5, patent name: casting self-hardening sand recovery and reusing and recycling system process, disclose casting self-hardening sand recovery and reusing and recycling system process, this technique comprises, induction system, crushing and screening magnetic separation system, vibration regenerative system, elevator system, 1 dust pelletizing system, centrifugal regenerative system, boiling cooling system, 2 dust pelletizing systems, storage sand system and electric-control systems.
The equipment adopted is recycled in the regeneration of antiquated sand has document open equally, as number of patent application: CN201220485689.8, patent name: full-automatic resin casting recycling line, disclose a kind of full-automatic resin casting recycling line, comprise sand shakeout system, shakeout, suspension magnetic separator, disintegrating machine, regenerating device, winnowing machine, two-chamber sand storage, batch mixing bucket, puddle mixer etc.As number of patent application: CN200920258838.5, patent name: large-scale self-hardening sand regeneration apparatus for crushing of vibrating shakeout, discloses a kind of equipment and can meet the large-scale self-hardening sand reclamation of return sand in Foundry Production, realize the effect of low energy consumption, high production.
Disclosed antiquated sand renovation process, equipment are merely adopt mechanical method of reproduction at present, the reclaimed sand impurity content obtained is high, the reclaimed sand coefficient of expansion is large, can only for the production of the not high foundry goods of dimension precision requirement, if expect the reclaimed sand of high-quality, antiquated sand must be combined machinery regeneration again through the high-temperature roasting of 700 DEG C, regeneration cost is very high.
Summary of the invention
The object of the invention is open a kind of antiquated sand renovation process, the reclaimed sand impurity content adopting the method to obtain is low, the reclaimed sand coefficient of expansion is little, and antiquated sand renovation process of the present invention is continuous automatic production, and output is large, and cost is low.The equipment that the present invention provides this antiquated sand renovation process to adopt equally.
Concrete technical scheme of the present invention is as follows:
Recycling cast waste sand reuse method, comprises the steps:
The pre-treatment of (a) antiquated sand: former antiquated sand removes waste and old rubbish by closed grid unloader in pre-treatment district, then through suspended magnetic separator removing scrap iron, again through linear vibrating screen removing bulky grain antiquated sand, finally by through magnetic separator removing waste iron filing, enter antiquated sand storage tank and deposit;
The scouring of (b) antiquated sand: the above-mentioned antiquated sand through pre-treatment is conveyed into cleaning area by sand pump, first pass into sand water separator and remove portion of water, then enter and clean combination cylinder scouring, by buffering concentration tank sedimentation concentration, eventually pass dewatering screen and slough portion of water;
C () is dry: antiquated sand goes low temperature drying or high-temperature roasting after the above-mentioned process in cleaning area, obtains reclaimed sand, puts into reclaimed sand tank storage and deposits;
D the aluminum coated steel of () reclaimed sand: the reclaimed sand of metering is heated to uniform temperature by heater, together puts into precoated sand mixer with adhesive, stirs, be cooled to normal temperature, obtain precoated sand, put into finished sand storage bucket.
Antiquated sand method for reclaiming of the present invention is divided into four regions antiquated sand regenerative process, pre-treatment district, cleaning area, dry section and overlay film district, former antiquated sand in pre-treatment district through the process of closed grid unloader, magnetic separator, vibratory sieve, iron block, iron filings in most of impurity on former antiquated sand surface, antiquated sand, and bulky grain antiquated sand is separated, the waste sand particles obtained is relatively more even, impurity content greatly reduces, the live load of friction scrubbing apparatus in cleaning area can be alleviated, and increase work efficiency.After screening bulky grain antiquated sand crusher in crushing out, with former antiquated sand together for the raw material of pre-treatment.Removing of antiquated sand surface impurity adopts the method for cleaning, exactly antiquated sand is put into and clean cylinder, then High Rotation Speed cleans the inner casing of cylinder, make phase mutual friction between waste sand particles, mutual collision, the impurity removal on surface, in order to avoid removing the impurity dust pollution workshop got off, the mode that the present invention adopts wet method to clean, remove the impurity got off trickleer because of particle, cleaning, the linear velocity obtained in cylinder is more much smaller than sand grains, and the density ratio sand grains of impurity is little, be easy to be washed away by flowing water, the impurity on antiquated sand surface reduces gradually, final impurity almost or is completely fallen by scouring.Antiquated sand moisture content after cleaning is high, have to pass through processed, otherwise next step drying process energy consumption will be very large.The drying process of the antiquated sand after cleaning, according to the size of sand grains, can be divided into low temperature drying and high-temperature roasting.Sand grains > 1mm's, adopt high-temperature roasting, this is because the sand inside of this particle is also containing impurity, the molding sand that the reclaimed sand that usual drying method obtains is made is in casting process, under hot environment, the impurity of sand grains inside can decompose, and smaller volume or change are greatly, affect the dimensional accuracy of foundry goods, serious caused foundry goods produces slight crack.The antiquated sand cleaned will through the break process of disintegrating machine before roasting, the impurity of sand grains inside can be made out exposed, remove iron tramp by permanent magnetic motor, then roasting under 300 ~ 400 DEG C of high temperature, organic impurities is oxidized to gas, and the reclaimed sand finally obtained almost or does not completely have impurity.The sand grains drying of particle < 1mm adopts cold drying, and the drying equipment of employing is less demanding, as long as the equipment that can produce 100 ~ 200 DEG C of temperature can use, as blast drier.The advantages such as the present invention adopts three backhaul dryers, and it has compact conformation, and floor space is few, reliable operation, and energy consumption is low, and the thermal efficiency is high, and drying materials is effective, easily realizes Automated condtrol, and operating personnel are few.First sand grains after cleaning can adopt solar energy drying, and then uses three backhaul driers, can reduce energy consumption like this, reduce costs.
The reclaimed sand obtained after super-dry can be used for producing precoated sand, resin sand.Because the reclaimed sand coefficient of expansion that antiquated sand obtains through regeneration methods of the invention is little, uniform particles, performance is better than fresh sand.Phenolic sand molding dimensional accuracy is more weaker than precoated sand moulding, and therefore the present invention adopts reclaimed sand to produce precoated sand, is used in the intricate casting that dimension precision requirement is higher, such as, in the casting of engine body etc.The production process of precoated sand is by the thermosetting phenolic resin of powdery and roughing sand mechanical mixture, solidifies during heating, makes sand grain surface to be covered with one deck solid resin film.
Realize equipment of the present invention to be divided into pre-treatment district, cleaning area, low temperature drying district, to cure district and overlay film district;
The equipment that pre-treatment district adopts comprises closed grid unloader, suspended magnetic separator, dust arrester, linear vibrating screen, through magnetic separator, bucket elevator, disintegrating machine and antiquated sand storage tank, the bottom of closed grid unloader is waste and old garbage discharge outlet, top is connected with dust arrester A, belt conveyor is provided with between closed grid unloader and suspended magnetic separator, belt conveyor is provided with between suspended magnetic separator and elevator A, linear vibrating screen is provided with below elevator A material outlet, bulky grain antiquated sand outlet bottom linear vibrating screen has disintegrating machine, linear vibrating screen material outlet is corresponding with the entrance of through magnetic separator, through magnetic separator is connected with bucket elevator B, belt conveyor is provided with between the material outlet of bucket elevator B and antiquated sand reservoir inlet, suspended magnetic separator, carry machine bucket, linear vibrating screen, through magnetic separator be connected with dust arrester (2) with the top pipeline of antiquated sand storage tank, described dust arrester is cyclone dust removal device.
The equipment that cleaning area adopts comprises sand water separator, cleans combination cylinder, cushions concentration tank and dewatering screen; Described scouring combination cylinder is that several combine with the scouring cylinder body being connected in series mode; Several separators are provided with around described sand water separator casing; Described buffering concentration tank tank base has the centrum of two different angles, has decompression back taper between two centrums.Be provided with sand pump between the antiquated sand holding vessel material outlet that pre-treatment district is arranged and the sand water separator material inlet of scrubbing area, sand water separator sand export is corresponding with scouring combination cylinder material inlet; Clean combination cylinder material outlet pipeline to be connected with the material inlet of another grit water separator with sand pump, the outlet of shaking out of another grit water separator is corresponding with the material inlet of buffering concentration tank; Buffering concentration tank material outlet is corresponding with dewatering screen material inlet; Dewatering screen material outlet place is provided with belt conveyor.
The equipment that low temperature drying district adopts comprises three backhaul drying units, linear vibrating screen, boiling cooling bed, dust arrester, bucket elevator, pneumatic conveyer, semi-finished product tank, boiling dedusting bed and finished pot; Belt conveyor is provided with between the dewatering screen of scrubbing area and three backhaul drying plants; Three backhaul drying plant material outlets are corresponding with the material inlet of linear vibrating screen, and the material outlet of linear vibrating screen is corresponding with the material inlet of boiling cooling bed, is provided with belt conveyor between boiling cooling bed material outlet and bucket elevator material inlet; Bucket elevator material outlet is corresponding with pneumatic conveyer material inlet; Pneumatic conveyer material outlet is corresponding with semi-finished product tank material inlet; Semi-product material outlet is corresponding with boiling dedusting bed material inlet; Boiling dedusting bed material outlet is corresponding with bucket elevator material inlet; Belt conveyor is provided with between bucket elevator material outlet and reclaimed sand tank; Three backhaul drying units, linear vibrating screen, boiling cooling bed, bucket elevator, semi-finished product tank, boiling dedusting bed are connected with dust arrester with reclaimed sand tank.
The equipment that high bake temperature district adopts comprises disintegrating machine, bucket elevator, permanentmagnet separator, excessively tank, roasting bed, air preheater, boiling cooling bed, settling dust remover, cyclone dust collectors, linear vibrating screen, air blast, tail gas heat exchanger, screw(-type) feeder, air-introduced machine and finished pot; Disintegrating machine material outlet is corresponding with bucket elevator material inlet, and bucket elevator material outlet is corresponding with permanentmagnet separator material inlet; Permanentmagnet separator material outlet is corresponding with excessive tank material inlet, is provided with screw(-type) feeder between excessive tank material outlet and roasting bed material inlet; The offgas outlet at roasting bed top is connected with air preheater; The cold air inlet of air preheater is connected with air blast, and hot-blast outlet is connected with roasting bed; Air preheater top pipeline is connected with tail gas heat exchanger; Roasting bed material outlet is corresponding with boiling cooling bed material inlet; Be connected with air blast bottom boiling cooling bed, the offgas outlet at top is connected with tail gas heat exchanger, and material outlet is corresponding with the material inlet of bucket elevator; The material outlet of bucket elevator is corresponding with the material inlet of linear vibrating screen; The material outlet of linear vibrating screen is corresponding with the material inlet of reclaimed sand tank; Tail gas heat exchanger is connected with settling dust remover; Settling dust remover is connected with cyclone separator; Cyclone separator is connected with air-introduced machine.
The equipment that overlay film district adopts comprises into sand weighing hopper, bucket elevator, roughing sand heater, overlay film mixer, Water-cooling vibration groove, water cold drum, vibratory sieve, deduster, water cooler and finished sand storage bucket; Enter sand weighing hopper material outlet corresponding with bucket elevator; Bucket elevator material outlet is corresponding with roughing sand heater material inlet; Roughing sand heater material outlet is corresponding with overlay film mixer; Overlay film mixer material outlet is corresponding with Water-cooling vibration groove material inlet; Water-cooling vibration groove material outlet is corresponding with water cold drum material inlet; Water cold drum material outlet is corresponding with vibratory sieve material inlet; Vibratory sieve material outlet is corresponding with bucket elevator material inlet; Bucket elevator material outlet is corresponding with water cooler material inlet; Water cooler material outlet is corresponding with bucket elevator material inlet; Bucket elevator material outlet is corresponding with finished sand storage bucket material inlet; Bucket elevator, precoated sand mixer, Water-cooling vibration groove are connected with deduster with water cold drum; Deduster adopts the composition of decanter type deduster or cyclone dust collector or decanter type deduster and cyclone dust collector.
Advantage of the present invention:
1. antiquated sand has pretreatment procedure before scouring operation, by pretreatment procedure, eliminates the impurity such as iron block, iron filings, carbide of the overwhelming majority in antiquated sand, alleviates the load cleaning operation, improve and clean efficiency.
2. the friction scrubbing apparatus cleaning operation employing is that several combine with the scouring cylinder body being connected in series mode, and antiquated sand is longer by cleaning the time at scouring cylinder, and scrub effect is good.
3. through the sand grains cleaned according to granular size, adopt different drying modes, ensure that the quality of reclaimed sand.
4. antiquated sand renovation process automaticity of the present invention is high, and the operation in regional can be produced separately, and maintenance is convenient.
5., by antiquated sand renovation process of the present invention, the reclaimed sand coefficient of expansion is little, uniform particles, and performance is better than fresh sand.
Accompanying drawing explanation
The process chart of Fig. 1 antiquated sand regeneration pre-treatment;
Process chart is cleaned in the regeneration of Fig. 2 antiquated sand;
The process chart of Fig. 3 antiquated sand regeneration low temperature drying;
The process chart that Fig. 4 antiquated sand regeneration high-temp cures;
Fig. 5 antiquated sand regeneration coating technique flow chart;
Fig. 6 sand water separator longitudinal sectional view;
Fig. 7 sand water separator stereogram;
Fig. 8 sand water buffering concentration tank stereogram;
Fig. 9 sand water buffering concentration tank longitudinal sectional view;
Figure 10 cleans cylinder top view;
Figure 11 cleans cylinder stereogram.
Detailed description of the invention
As shown in Fig. 1 ~ Fig. 5, recycling cast waste sand reuse process of the present invention is divided into pre-treatment, scouring, drying and overlay film four operations, the equipment used is divided into pre-treatment district, scrubbing area, dry section and overlay film district accordingly, according to the difference of baking temperature, be divided into low temperature drying and high bake temperature two kinds of modes.
The pre-treatment of former antiquated sand: former antiquated sand joins in closed antiquated sand grid unloader, under the effect of grid unloader, isolates the waste and old rubbish such as the carbide of resin, organic dust, collects from the waste and old garbage discharge outlet bottom grid unloader; Grid unloader top adopts the dust arrester of the semiclosed dust excluding hood of wind curtain type, ensures dust removing effects.Isolate sand grains and send into suspended magnetic separator by belt, magnetic field intensity B >=5000 Gauss of magnetic separator, magnet selects rubidium iron boron permanent magnet, and the block scrap iron in antiquated sand is isolated; Isolate the antiquated sand Belt Conveying of scrap iron block to bucket elevator, bucket elevator adopts plate chain type bucket elevator, and material adopts 16Mn steel, and wearability is good; Linear vibrating screen is entered from bucket elevator antiquated sand out, utilize vibrating motor exciting as vibration source, make antiquated sand tossed on screen cloth, simultaneously moving linearly forward, antiquated sand enters the charging aperture of screening machine equably from batcher, by Double-layer screen produce two kinds of specifications oversize, screenings, discharge from respective outlet respectively; Screenings is the sand grains that particle is greater than 1mm, mixes with former antiquated sand with after crusher in crushing, together uses the process of grid unloader; Particle is less than the through magnetic separator process of sand grains of 1mm, magnetic field intensity B >=5000 Gauss of magnetic separator, and magnet selects rubidium iron boron permanent magnet, selects the waste iron filing in sand grains; Isolate sand grains that scrap iron cuts by bucket elevator and belt conveyor, put into antiquated sand tank storage and deposit.Antiquated sand through pre-treatment eliminates most iron tramp, and size is even, and appearance is black, and quartz sand surface is adsorbed with one deck carbide impurity, just can be back to production precoated sand after having to pass through scrub.
The scouring of antiquated sand: with water and sand pump as the driving medium of antiquated sand and power (weight ratio of water and antiquated sand is about 2:1), antiquated sand is pumped into sand water separator from antiquated sand tank, several separators (as shown in Figure 6,7) are had around the body of sand water separator, there is dividing plate separately in the middle of sand water separator fuselage, be divided into upper and lower casing, sand water enters sand water separator from lower box, then enter each separator and carry out sand, water separation, sand is discharged from the outlet of separator bottom, moisture content, about 80%, goes to clean cylinder and cleans.Clean the scouring cylinder body that cylinder (as shown in Figure 10,11) fuselage has several to connect in a series arrangement, each scouring cylinder body has inner casing and outer shell, the wear-resistant baffle plate of outer shell liner content and high manganses and chromium content, clean cylinder body for 2 ~ 3 and share a motor, cleaning on cylinder deck is flat plastic or sheet metal, and cleaning periphery outside cylinder body is concrete fuselage.Antiquated sand is cleaned cylinder body from first and is entered, in the motion of scouring cylinder body high speed, mutual collision friction, the partial impurities on sand body surface is removed, and then washes away with water, antiquated sand enters second and cleans cylinder body continuation scouring, the impurity on surface is removed further, cleans the antiquated sand substantially free of impurities of cylinder body scouring, wash away the impurity removing with water through last, therefore the water content of sand is very large, is separated with sand water separator; The water-containing rate that obtains is separated still up to 60 ~ 80% through sand water separator, put into buffering concentration tank (as shown in Figure 8,9), centrum bottom buffering concentration tank is two centrums in different angles, the effect of two centrums is different, upper one is settlement action, and the next one is deposition, and design can prevent sand deposition too fast like this, cause the sand of tank base to deposit too closely knit, block bottom and go out sand pipeline.In order to prevent because unexpected causing produces interruption, deposition makes sand closely knit for a long time, blocks tank base and pipeline, affects follow-up production, be also provided with a back taper between two centrums, is provided with a high-pressure water pipe above back taper; When the sand of deposition is too closely knit, pass into water under high pressure to high-pressure water pipe, high pressure water flushing, on back taper surface, then sprays to surrounding, makes the sand of surrounding loose.The water-containing rate concentrated through buffering concentration tank is 20 ~ 40%, uses dewatering screen process, by the vibration of dewatering screen, sloughs moisture; By the water-containing rate of dewatering screen process below 20%, appearance is pure white, is carried remove drying process by belt conveyor.
Low temperature drying: enter three backhaul drying units from dewatering screen sand Belt Conveying out and carry out drying process, baking temperature 150 ~ 200 DEG C, linear vibrating screen is passed into from three backhaul drying units dry sand out, utilize vibrating motor exciting as vibration source, make sand tossed on screen cloth, simultaneously moving linearly forward, sieve removes dust (granularity is less than the particulate of 0.01mm), then enter boiling cooling bed, under cold wind effect, be cooled to less than 80 DEG C; Then be sent to bucket elevator with belt, submit to pneumatic conveyer, sand grains in pneumatic conveyer by wind-force effect, blow away the micro mist in sand grains, plaster, then put into semi-finished product tank, then be conveyed into boiling dedusting bed from semi-finished product tank, under airflow function, blow away the micro mist in sand grains, plaster, guarantee that powder content is less than 0.1%, finally by bucket elevator and belt, be conveyed into reclaimed sand storage tank and store, the reclaimed sand appearance obtained is pure white, uniform particles, SiO
2be greater than 98%, moisture content < 0.2%, igloss amount < 0.2%.
High bake temperature: bulky grain sand (the granularity > 1mm) crusher in crushing that dewatering screen sifts out, then permanentmagnet separator is transported to bucket elevator, magnetic field intensity B is 3000 ~ 5000 Gausses, isolate iron filings, sand grains puts into excessive tank, roasting bed is conveyed into from transition tank again with screw(-type) feeder, the hot blast temperature of roasting bed is 300 ~ 400 DEG C, hot blast is produced by air blast and air preheater, in order to reduce energy consumption, the tail gas that roasting bed produces is connected with air preheater, and tail gas by supplementing heat energy at air preheater, then returns roasting bed.Sand after roasting passes into boiling cooling bed, is cooled to less than 100 DEG C under cold wind, is then conveyed into linear vibrating screen with bucket elevator, removing granularity is greater than 1mm and is less than the sand grains of 0.01mm, and the reclaimed sand obtained puts into reclaimed sand storage tank, and the reclaimed sand appearance obtained is pure white, uniform particles, SiO
2be greater than 98%, moisture content < 0.2%, igloss amount < 0.2%.
The aluminum coated steel of reclaimed sand: reclaimed sand is put into from reclaimed sand storage tank and measures into sand weighing hopper, be conveyed into roughing sand heater by bucket elevator to heat, sand temperature is made to be 100 ~ 120 DEG C, then transfer in precoated sand mixer, add adhesive: powdery thermoplastic phenolic resins, the addition of adhesive is 0.5 ~ 1% of sand weight, and add the calcium stearate of 0.1 ~ 0.2%, 1 ~ 3h is stirred at about 120 DEG C, then move on in Water-cooling vibration groove, be cooled to transfer in water cold drum after below 80 DEG C and again cool, temperature is made to be cooled to less than 50 DEG C, be transported to vibratory sieve, the overlay film sand sieve of particle > 2mm is gone, be conveyed into water cooler from the precoated sand bucket elevator that vibratory sieve is out qualified and be cooled to less than 30 DEG C, finished sand storage tank bucket is conveyed into again with bucket elevator.
Claims (6)
1. a recycling cast waste sand reuse method, is characterized in that, comprises the steps:
The pre-treatment of (a) antiquated sand: former antiquated sand removes waste and old rubbish by closed grid unloader in pre-treatment district, then through suspended magnetic separator removing scrap iron, the bulky grain antiquated sand of 0.2mm is greater than again through linear vibrating screen removing granularity, finally by through magnetic separator removing waste iron filing, enter antiquated sand tank and deposit;
The scouring of (b) antiquated sand: the above-mentioned antiquated sand through pre-treatment is conveyed into cleaning area by sand pump, first pass into sand water separator and remove portion of water, then enter and clean combination cylinder scouring, by buffering concentration tank sedimentation concentration, eventually pass dewatering screen and slough portion of water;
C () is dry: antiquated sand removes low temperature drying or high bake temperature after the above-mentioned process in cleaning area, obtains reclaimed sand, puts into reclaimed sand tank storage and deposits; The temperature of described low temperature drying is 100 ~ 200 DEG C; Described high bake temperature, the temperature of curing is 300 ~ 400 DEG C;
D the aluminum coated steel of () reclaimed sand: the reclaimed sand of metering is heated to uniform temperature by heater, together puts into precoated sand mixer with adhesive, stirs, be cooled to normal temperature, obtain precoated sand, put into finished sand storage bucket;
The concrete technology of described aluminum coated steel is: reclaimed sand is put into from reclaimed sand tank and measures into sand weighing hopper, be conveyed into roughing sand heater by bucket elevator to heat, sand temperature is made to be 100 ~ 120 DEG C, then transfer in precoated sand mixer, add powdery thermoplastic phenolic resin adhesive, the addition of adhesive is 0.5 ~ 1% of reclaimed sand gross weight, and add the calcium stearate of reclaimed sand gross weight 0.1 ~ 0.2%, 1 ~ 3h is stirred at about 120 DEG C, then move on in Water-cooling vibration groove, be cooled to transfer in water cold drum after below 80 DEG C and again cool, temperature is made to be cooled to less than 50 DEG C, be transported to vibratory sieve, the overlay film sand sieve of particle diameter > 2mm is gone, be conveyed into water cooler from the precoated sand bucket elevator that vibratory sieve is out qualified and be cooled to less than 30 DEG C, finished sand storage bucket is conveyed into again with bucket elevator.
2. recycling cast waste sand reuse method according to claim 1, it is characterized in that, the equipment that described pre-treatment district adopts comprises closed grid unloader, suspended magnetic separator, dust arrester, linear vibrating screen, through magnetic separator, bucket elevator, disintegrating machine and antiquated sand tank; The bottom of closed grid unloader is waste and old garbage discharge outlet, top is connected with dust arrester, belt conveyor is provided with between closed grid unloader and suspended magnetic separator, belt conveyor is provided with between suspended magnetic separator and elevator, linear vibrating screen is provided with below elevator material outlet, bulky grain antiquated sand outlet bottom linear vibrating screen has disintegrating machine, linear vibrating screen material outlet is corresponding with the entrance of through magnetic separator, through magnetic separator is connected with bucket elevator, is provided with belt conveyor between the material outlet of bucket elevator and antiquated sand tank entrance; Suspended magnetic separator, bucket elevator, linear vibrating screen, through magnetic separator are connected with dust arrester with the top pipeline of antiquated sand tank; Described dust arrester is cyclone dust removal device.
3. recycling cast waste sand reuse method according to claim 1, is characterized in that: the equipment that the cleaning area of described antiquated sand adopts comprises sand water separator, cleans combination cylinder, cushions concentration tank and dewatering screen; Described scouring combination cylinder is that the scouring cylinder body that several connect in a series arrangement combines; Several separators are provided with around described sand water separator casing; Described buffering concentration tank tank base has the cone of two different angles, has decompression back taper between two cones; Be provided with sand pump between the antiquated sand tank material outlet that pre-treatment district is arranged and the sand water separator material inlet of scrubbing area, sand water separator sand export is corresponding with scouring combination cylinder material inlet; Clean combination cylinder material outlet pipeline to be connected with the material inlet of another grit water separator, the outlet of shaking out of another grit water separator is corresponding with the material inlet of buffering concentration tank; Buffering concentration tank material outlet is corresponding with dewatering screen material inlet; Dewatering screen material outlet place is provided with belt conveyor.
4. recycling cast waste sand reuse method according to claim 1, is characterized in that: the equipment that antiquated sand regeneration low temperature drying part adopts comprises three backhaul drying units, linear vibrating screen, boiling cooling bed, dust arrester, bucket elevator, pneumatic conveyer, semi-finished product tank, boiling dedusting bed and reclaimed sand tank; Belt conveyor is provided with between the dewatering screen of scrubbing area and three backhaul drying units; Three backhaul drying unit material outlets are corresponding with the material inlet of linear vibrating screen, and the material outlet of linear vibrating screen is corresponding with the material inlet of boiling cooling bed, is provided with belt conveyor between boiling cooling bed material outlet and bucket elevator material inlet; Bucket elevator material outlet is corresponding with pneumatic conveyer material inlet; Pneumatic conveyer material outlet is corresponding with semi-finished product tank material inlet; Semi-product material outlet is corresponding with boiling dedusting bed material inlet; Boiling dedusting bed material outlet is corresponding with bucket elevator material inlet; Belt conveyor is provided with between bucket elevator material outlet and reclaimed sand tank; Three backhaul drying units, linear vibrating screen, boiling cooling bed, bucket elevator, semi-finished product tank, boiling dedusting bed are all connected with dust arrester with reclaimed sand tank.
5. recycling cast waste sand reuse method according to claim 1, is characterized in that: the equipment that antiquated sand regeneration high-temp cures part employing comprises disintegrating machine, bucket elevator, permanentmagnet separator, transition tank, roasting bed, air preheater, boiling cooling bed, settling dust remover, cyclone dust collectors, linear vibrating screen, air blast, tail gas heat exchanger, screw(-type) feeder, air-introduced machine and reclaimed sand tank; Disintegrating machine material outlet is corresponding with bucket elevator material inlet, and bucket elevator material outlet is corresponding with permanentmagnet separator material inlet; Permanentmagnet separator material outlet is corresponding with transition tank material inlet, is provided with screw(-type) feeder between transition tank material outlet and roasting bed material inlet; The offgas outlet at roasting bed top is connected with air preheater; The cold air inlet of air preheater is connected with air blast, and hot-blast outlet is connected with roasting bed; Air preheater top pipeline is connected with tail gas heat exchanger; Roasting bed material outlet is corresponding with boiling cooling bed material inlet; Be connected with air blast bottom boiling cooling bed, the offgas outlet at top is connected with tail gas heat exchanger, and material outlet is corresponding with the material inlet of bucket elevator; The material outlet of bucket elevator is corresponding with the material inlet of linear vibrating screen; The material outlet of linear vibrating screen is corresponding with the material inlet of reclaimed sand tank; Tail gas heat exchanger is connected with settling dust remover; Settling dust remover is connected with cyclone dust collectors; Cyclone dust collectors are connected with air-introduced machine.
6. recycling cast waste sand reuse method according to claim 1, is characterized in that: the equipment that antiquated sand regeneration coating process adopts comprises into sand weighing hopper, bucket elevator, roughing sand heater, overlay film mixer, Water-cooling vibration groove, water cold drum, vibratory sieve, deduster, water cooler and finished sand storage bucket; Enter sand weighing hopper material outlet corresponding with the first bucket elevator; First bucket elevator material outlet is corresponding with roughing sand heater material inlet; Roughing sand heater material outlet is corresponding with overlay film mixer; Overlay film mixer material outlet is corresponding with Water-cooling vibration groove material inlet; Water-cooling vibration groove material outlet is corresponding with water cold drum material inlet; Water cold drum material outlet is corresponding with vibratory sieve material inlet; Vibratory sieve material outlet is corresponding with the second bucket elevator material inlet; Second bucket elevator material outlet is corresponding with water cooler material inlet; Water cooler material outlet is corresponding with the 3rd bucket elevator material inlet; 3rd bucket elevator material outlet is corresponding with finished sand storage bucket material inlet; Bucket elevator, overlay film mixer, Water-cooling vibration groove are all connected with deduster with water cold drum; Deduster adopts the composition of decanter type deduster or cyclone dust collectors or decanter type deduster and cyclone dust collectors.
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