CN102615243A - Foundry used sand wet intermittent regeneration method and equipment thereof - Google Patents
Foundry used sand wet intermittent regeneration method and equipment thereof Download PDFInfo
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- CN102615243A CN102615243A CN2012100841864A CN201210084186A CN102615243A CN 102615243 A CN102615243 A CN 102615243A CN 2012100841864 A CN2012100841864 A CN 2012100841864A CN 201210084186 A CN201210084186 A CN 201210084186A CN 102615243 A CN102615243 A CN 102615243A
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- 239000004576 sand Substances 0.000 title claims abstract description 201
- 238000011069 regeneration method Methods 0.000 title abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 95
- 238000000034 method Methods 0.000 claims abstract description 42
- 238000004140 cleaning Methods 0.000 claims abstract description 33
- 238000000926 separation method Methods 0.000 claims abstract description 26
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000004927 clay Substances 0.000 claims abstract description 16
- 239000005011 phenolic resin Substances 0.000 claims abstract description 6
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims description 48
- 238000009991 scouring Methods 0.000 claims description 36
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 27
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 26
- 239000010865 sewage Substances 0.000 claims description 19
- 238000002156 mixing Methods 0.000 claims description 18
- 239000013049 sediment Substances 0.000 claims description 13
- 239000004115 Sodium Silicate Substances 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 11
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 11
- 238000009418 renovation Methods 0.000 claims description 9
- 230000018044 dehydration Effects 0.000 claims description 8
- 238000006297 dehydration reaction Methods 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 8
- 239000003513 alkali Substances 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 230000008929 regeneration Effects 0.000 abstract description 23
- 235000019353 potassium silicate Nutrition 0.000 abstract description 7
- 238000005201 scrubbing Methods 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000005406 washing Methods 0.000 abstract description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 abstract 1
- 239000002253 acid Substances 0.000 abstract 1
- 239000000853 adhesive Substances 0.000 abstract 1
- 230000001070 adhesive effect Effects 0.000 abstract 1
- 238000010907 mechanical stirring Methods 0.000 abstract 1
- 230000001172 regenerating effect Effects 0.000 description 26
- 230000000694 effects Effects 0.000 description 8
- 239000000126 substance Substances 0.000 description 7
- 239000011230 binding agent Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 239000002313 adhesive film Substances 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000013467 fragmentation Methods 0.000 description 2
- 238000006062 fragmentation reaction Methods 0.000 description 2
- 238000007885 magnetic separation Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000006148 magnetic separator Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000003534 oscillatory effect Effects 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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Abstract
A foundry used sand wet intermittent regeneration method and equipment thereof belong to a foundry used sand regeneration method and equipment thereof, aim to solve the problem of complicated process and narrow application scope of the conventional foundry used sand wet regeneration method, and further solve the problem of relatively complicated structure of the conventional regeneration equipment. The regeneration method comprises a scrubbing step, a second scrubbing step, a third scrubbing step and a checking step. The regeneration equipment comprises a stirrer and a sand-water separation device, wherein the stirrer comprises a support frame, a scrubbing cylinder, a drive cylinder, a motor and a main shaft, and the scrubbing cylinder is provided with a sand inlet and a water inlet and further provided with a water drainage valve and a sand discharge valve. By integrating the combined actions of mechanical stirring, water washing and acid cleaning, the regeneration method provided by the invention has the advantages of convenience in control, low water consumption, high residual adhesive removal ratio and good sand regeneration quality; the regeneration equipment has the advantages of simple structure, low energy consumption, convenience in control and good sand regeneration quality; and the regeneration method and equipment are suitable for large-scale wet regeneration of used clay sand, used water glass sand and used alkaline phenolic resin sand.
Description
Technical field
The invention belongs to casting old-sand regeneration method and equipment thereof, be specifically related to a kind of cast used sand wet method batch (-type) renovation process and equipment thereof.
Background technology
Casting old-sand regeneration is meant the old sand piece of using and recovers to be bordering on the physics and the chemical property of fresh sand through broken and remove residual adhensive membrane and the foreign material that are wrapped on the waste and old sand grains, uses to replace fresh sand.
At present, casting old-sand regeneration method commonly used mainly contains three kinds:
First method is a dry reclamation.The form of old sand dry reclamation is varied, and mechanical type, air-flowing type, oscillatory type or the like are arranged, but sees all it is " collision friction " process with regard to regeneration mechanism.When the active force that produces in the collision friction during greater than the bond strength of the yield strength of the residual adhesive film on the old sand grain or former sand grains and residual adhesive film; Residual adhesive film on the old sand grain is destroyed and breaks away from former sand grains, and residual adhesive film is removed from sand after selection by winnowing; And the number of times of collision friction is more, intensity is big more, and residual adhesive film is removed totally more, and the effect of dry reclamation is good more.But excessive collision friction active force and too much collision friction effect number of times not only can increase the wearing and tearing of element of installation, also can aggravate the fragmentation of sand grains self.Therefore, improving the active force and effect number of times of collision friction in the dry reclamation, is not the best approach that improves the dry reclamation effect.
The device structure and the system layout of old sand dry reclamation are simple than wet reclamation, invest also less slightlyly, and the secondary pollution problem of dust is prone to solve, but its reclaimed sand is of low quality, only do floor sand usually and use.
Second method is thermal reclamation, and old sand through heating, high-temperature roasting, is got rid of the residual binding agent in the old sand, and the thermal reclamation method is used for resin sand regenerating used reuse more, and the reclaimed sand quality after the processing is better, and residual binding agent clearance is high.But thermal reclamation exists shortcomings such as the volatile matter of big, the residual binding agent burning of high temperature energy consumption generation is seriously polluted, cost is high, less economical.
The third method is wet reclamation.Because the water-soluble characteristic of the residual binding agent of old sand makes that the effect of wet reclamation is good especially.The quality of washed sand is high, and the key property index approaches fresh sand, can 100% make facing sand or system sand uses, the rate of recovery of reclaimed sand also very high (can reach more than 95%).But China wet reclamation system in the past adopts the continous way regenerative system more, and structure is complicated huge, and mechanization degree is lower, and water consumption is big, and the cost of washed sand is higher, and sewage handling problem solves undesirable.
In recent years; The chemical regeneration method of cast used sand is development gradually also; Chemical regeneration typically refers to and in old sand, adds some chemical reagent (or solvent); Stir old sand and chemical reagent (or solvent), remove residual binding agent and harmful components in the old sand by chemical reaction and old sand is recovered or near the physical and chemical performance of fresh sand.As normally in used sodium silicate sand, adding solution such as HCl, NH4Cl with neutralization residual Na2O wherein with chemical method recycled water glass sand.The quality of chemical regeneration sand is good, can replace fresh sand to use, but because production cost is high, seldom adopts in practice.
Publication number CN101780521A patent of invention has proposed a kind of process for regenerating forced scrubbing water glass used sand through wet, at first the old sand input jaw crusher of collecting is carried out fragmentation, is transported to magnetic separator then and carries out magnetic separation; Sand grains after the magnetic separation carries out the sand separated form water through one-level spiral grit water separator, one-level mixer and deuterostrophies grit water separator to old sand; Through the neutralization precipitation pond sand after separating is neutralized again again; Carry out secondary sand separated form water through secondary mixer, three grades of spiral grit water separators again, the waterglass that exists in the assurance old sand can thoroughly be removed totally; Be finished product and send into sand storage through the sand grains after dedusting, the oven dry at last.This method adopts multistage wet reclamation system, and regeneration technology and regenerative system structure are relatively complicated, and this method and regenerating used system be only limited to the regeneration of used sodium silicate sand, then can not realize for the clay regenerating used.
200710159803.1 patent of invention has proposed a kind of regenerating used method and regenerating used system thereof; Place used sodium silicate sand the used sand regenerating machine heating to clean; Dissolve the inert coating on old sand surface; Let sewage see through the regeneration layer of sand then, the fine powder in the sewage is trapped within the reclaimed sand, and waterglass flows into storage tank with water.Send into reclaimed sand in the dryer to send into again after the oven dry and remove dust in the dry reclamation machine and promptly obtain clean reclaimed sand.Liquid in the storage tank can repeatedly repeat to be back to the scouring old sand.In this method and the regenerative system owing to adopted heating system; Whole regenerative system structure is relatively complicated, and the regenerating used cost is higher, and this method and regenerating used system also are only limited to the regeneration of used sodium silicate sand; Then can not realize for the clay regenerating used, use the face relative narrower.
201010170597.6 patent of invention proposes a kind of sodium silicate waste sand rotary vibration grinding wet-type regenerator, is used for the regeneration of old sand.Regenerating device comprises steel spiral rubber-spring complex, frame, outer cylinder body, inner barrel, cylindrical shell side plate, ceramic grinding ball and vibrating motor; The steel spiral rubber-spring complex of regenerating device has many; The outer rim of outer cylinder body is held on middle one group of steel spiral rubber-spring complex; The inner barrel crown center is provided with the grid sieve plate, and ceramic grinding ball places in the cavity that forms between outer cylinder body and the inner barrel, and the frame horizontal arrangement is about said on two groups of steel spiral rubber-spring complexs; And be fixedly connected with regenerating device two cylindrical shell side plates; Vibrating motor has two, and two vibrating motor one the first from left right sides are fixedly connected on the frame of outer cylinder body the right and left, and the centerline of its center line and said inner barrel and outer cylinder body is on same straight line.On the whole; This regenerating device adopts the rotary vibration Ginding process that used sodium silicate sand is carried out wet reclamation, and parts are more, the structure relative complex; And this method and regenerating used system also are only limited to the regeneration of used sodium silicate sand, then can not realize for the clay regenerating used.
Summary of the invention
The present invention proposes a kind of cast used sand wet method batch (-type) renovation process, and it is complicated to solve existing cast used sand wet reclamation method technology, the problem that use face is narrower; Be provided for the equipment of this method simultaneously, solve existing reclaim equiment structure, be used for the wet reclamation of clay old sand, used sodium silicate sand and alkali phenolic resins old sand than complicated problems.
A kind of cast used sand wet method batch (-type) renovation process of the present invention is applicable to clay old sand, used sodium silicate sand and alkali phenolic resins old sand, comprises the steps:
(1) once clean step: pressed mass ratio 1: 0.5~1: 3, and old sand and clear water were added respectively to clean in the tube stir, mixing time 30 seconds~300 seconds is discharged the sewage of cleaning tube then;
(2) secondary is cleaned step: inject a clear water to the scouring tube once more, cleaning the interior old sand of tube is 1: 0.5~1: 3 with the clear water quality ratio, stirs, and mixing time 30 seconds~300 seconds is discharged the sewage of cleaning tube then;
When sand sample is alkalescence, add hydrochloric acid or sulfuric acid during stirring, when concentration of hydrochloric acid was mass percent 37.5%, addition was every kg old sand 0.8~1.5ml hydrochloric acid; When sulfuric acid concentration was mass percent 98.3%, addition was every kg old sand 0.15~0.25ml sulfuric acid;
Clean step (3) three times: inject clear water to cleaning tube for the third time, cleaning the tube old sand is 1: 0.5~1: 3 with the clear water quality ratio, stir, and mixing time 30 seconds~300 seconds, the sand aqueous mixtures that will clean tube then enters the sand water separation equipment to be separated;
(4) checking procedure: the damp sand after the sand water separation equipment separates, after dehydration, oven dry, check its quality whether to meet the requirements again, be then to finish, otherwise change step (2).
A kind of cast used sand wet reclamation equipment of the present invention comprises mixer and sand water separation device, it is characterized in that:
Said mixer, by bracing frame, clean tube, drive cylinder, motor and main shaft and constitute, support frame as described above is a frame shape, and its bottom is equipped with and is cleaned tube, and the driving cylinder is equipped with in the bracing frame upper surface, and motor is equipped with in the bracing frame side; Said scouring tube upper surface has sand inlet and water inlet, cleans the tube bottom and has water discharging valve and sediment outflow valve, and water discharging valve is connected with the sediment outflow pipe with drainpipe respectively with the sediment outflow valve;
Said main shaft top is connected with drive motors through belt drive unit, and the main shaft upper end is connected with the air cylinder tie rod that drives cylinder through the interlock bearing, and said scouring tube upper surface is passed in the main shaft bottom, and stirring vane is equipped with in the main shaft bottom;
Said sediment outflow pipe is communicated with the sand water separation device.
Described cast used sand wet reclamation equipment is characterized in that:
Said interlock bearing is made up of ball bearing and link, and ball bearing is fixed in link upper surface central authorities; Said belt drive unit is made up of big belt wheel, feed belt and small pulley, and feed belt connects big belt wheel and small pulley, and big belt wheel and wheeled pallet are rotationally connected through bearing, and the wheeled pallet bottom is fixed on cleans the tube upper surface;
Said drive motors rotating shaft is connected through key pin with said small pulley, and said main axis cross section is a rectangle, and main shaft top penetrates said wheeled pallet centre bore and big belt wheel centre bore, is slidingly matched with wheeled pallet centre bore and big belt wheel centre bore; Said main shaft upper end is connected with the link lower end of said interlock bearing, and said air cylinder tie rod lower end embeds the ball bearing of said interlock bearing.
Described cast used sand wet reclamation equipment is characterized in that:
Said driving cylinder is hydraulic cylinder or pneumatic cylinder;
Said sand water separation device is centrifugal separating device or vibration separate equipment.
The course of work of said cast used sand wet reclamation equipment is:
(1) old sand and clear water are added in the scouring tube 12 from sand inlet 11 and water inlet 6 respectively by a certain percentage; In driving cylinder 1 effect lower main axis 10 bottom stirring vanes 13 decline entering sand aqueous mixtures, stir; After stirring end; The sand aqueous mixtures is left in stirring vane 13 risings under 1 effect of driving cylinder, opens the water discharging valve 8 of cleaning tube 12, effluent sewerage;
(2) after sewer finishes, inject clear water from water inlet 6 once more, and add hydrochloric acid or sulfuric acid, stirring vane 13 gets into once more to clean in the tube 12 and stirs, stir finish after, drive cylinder 1 and promote stirring vane 13, open and clean a water discharging valve 8 of tins 12, effluent sewerage;
(3) inject clear water for the third time; Stirring vane 13 gets into for the third time to clean in the tube 12 and stirs, and behind the stirring certain hour, opens sediment outflow valve 16; The sand aqueous mixtures is discharged together under the effect of stirring vane 13 and is cleaned cylindrical shell, gets into sand water separation equipment 18 and separates.
Renovation process of the present invention combines dry reclamation, wet reclamation and chemical regeneration mode, combines the acting in conjunction of mechanical agitation, clear water washing and pickling, and control is convenient, water consumption is little, the residual binding agent clearance of old sand is high, the reclaimed sand quality is good.Reclaim equiment of the present invention is simple in structure, energy consumption is low, be convenient to control, realizes the automation of regenerative process easily, can obtain high-quality reclaimed sand; Be applicable to the extensive wet reclamation of clay old sand, used sodium silicate sand.
Description of drawings
Fig. 1 is a cast used sand wet method batch (-type) renovation process schematic flow sheet of the present invention;
Fig. 2 is a cast used sand wet reclamation equipment sketch map of the present invention;
Fig. 3 is that main shaft, interlock bearing and big belt wheel cooperate sketch map.
The specific embodiment
Cast used sand wet method batch (-type) renovation process of the present invention is as shown in Figure 1.
Embodiment 1: be used for neutral clay regenerating used, comprise the steps:
(1) once cleans step: pressed mass ratio 1: 0.5, and old sand and clear water were added respectively to clean in the tube stir scouring, stir 30 seconds scouring time, discharge the sewage of cleaning tube then;
(2) secondary is cleaned step: inject clear water to cleaning tube once more, old sand is 1: 0.5 with the clear water quality ratio in the scouring tube, stirs scouring, stirs 30 seconds scouring time, discharges the sewage of scouring tube then;
Clean step (3) three times: inject clear water to cleaning tube for the third time, cleaning the tube old sand is 1: 0.5 with the clear water quality ratio, stirs scouring, stirs 30 seconds scouring time, and the sand aqueous mixtures that will clean tube then enters the sand water separation equipment to be separated;
(4) checking procedure: the damp sand after the sand water separation equipment separates, after dehydration, oven dry, check its quality to meet the requirements again, finish.
Record through test, the clay-bonded sand clay content after the regeneration is 0.2%, and 1h tensile strength is 1MPa, and 24h tensile strength is 2.1MPa, near the performance of fresh sand.
Embodiment 2: be used for neutral clay regenerating used, comprise the steps:
(1) once cleans step: pressed mass ratio 1: 3, and old sand and clear water were added respectively to clean in the tube stir scouring, stir 300 seconds scouring time, discharge the sewage of cleaning tube then;
(2) secondary is cleaned step: inject clear water to cleaning tube once more, old sand is 1: 3 with the clear water quality ratio in the scouring tube, stirs scouring, stirs 300 seconds scouring time, discharges the sewage of scouring tube then;
Clean step (3) three times: inject clear water to cleaning tube for the third time, cleaning the tube old sand is 1: 3 with the clear water quality ratio, stirs scouring, stirs 300 seconds scouring time, and the sand aqueous mixtures that will clean tube then enters the sand water separation equipment to be separated;
(4) checking procedure: the damp sand after the sand water separation equipment separates, after dehydration, oven dry, check its quality to meet the requirements again, finish.
Record through test, the clay-bonded sand clay content after the regeneration is 0.18%, and 1h tensile strength is 1.05MPa, and 24h tensile strength is 2.2MPa, near the performance of fresh sand.
Embodiment 3: be used for alkaline regenerating water-glass old sand, comprise the steps:
(1) once clean step: pressed mass ratio 1: 0.5, and old sand and clear water were added respectively to clean in the tube stir, mixing time 30 seconds is discharged the sewage of cleaning tube then;
(2) secondary is cleaned step: to cleaning tube injection clear water, old sand is 1: 0.5 with the clear water quality ratio in the scouring tube, and adds hydrochloric acid once more, stirs mixing time 30 seconds, the sewage of discharge scouring tube then; When said concentration of hydrochloric acid was mass percent 37.5%, addition was every kg old sand 0.8ml hydrochloric acid;
Clean step (3) three times: inject clear water to cleaning tube for the third time, cleaning the tube old sand is 1: 0.5 with the clear water quality ratio, stir, and mixing time 30 seconds, the sand aqueous mixtures that will clean tube then enters the sand water separation equipment to be separated;
(4) checking procedure: the damp sand after the sand water separation equipment separates, after dehydration, oven dry, check its quality to meet the requirements again, finish.
Record through test, the clay-bonded sand clay content after the regeneration is 0.21%, and 1h tensile strength is 0.95MPa, and 24h tensile strength is 2.0MPa, near the performance of fresh sand.
Embodiment 4: be used for alkaline regenerating water-glass old sand, comprise the steps:
(1) once clean step: pressed mass ratio 1: 3, and old sand and clear water were added respectively to clean in the tube stir, mixing time 300 seconds is discharged the sewage of cleaning tube then;
(2) secondary is cleaned step: to cleaning tube injection clear water, old sand is 1: 3 with the clear water quality ratio in the scouring tube, and adds hydrochloric acid once more, stirs mixing time 300 seconds, the sewage of discharge scouring tube then; When said concentration of hydrochloric acid was mass percent 37.5%, addition was every kg old sand 1.5ml hydrochloric acid;
Clean step (3) three times: inject clear water to cleaning tube for the third time, cleaning the tube old sand is 1: 3 with the clear water quality ratio, stir, and mixing time 300 seconds, the sand aqueous mixtures that will clean tube then enters the sand water separation equipment to be separated;
(4) checking procedure: the damp sand after the sand water separation equipment separates, after dehydration, oven dry, check its quality to meet the requirements again, finish.
Record through test, the clay-bonded sand clay content after the regeneration is 0.19%, and 1h tensile strength is 1.05MPa, and 24h tensile strength is 2.0MPa, near the performance of fresh sand.
Embodiment 5: be used for the regenerating used of alkali base phenolic resins, comprise the steps:
(1) once clean step: pressed mass ratio 1: 0.5, and old sand and clear water were added respectively to clean in the tube stir, mixing time 30 seconds is discharged the sewage of cleaning tube then;
(2) secondary is cleaned step: to cleaning tube injection clear water, old sand is 1: 0.5 with the clear water quality ratio in the scouring tube, and adds sulfuric acid once more, stirs mixing time 30 seconds, the sewage of discharge scouring tube then; When said sulfuric acid concentration was mass percent 98.3%, addition was every kg old sand 0.15ml sulfuric acid;
Clean step (3) three times: inject clear water to cleaning tube for the third time, cleaning the tube old sand is 1: 0.5 with the clear water quality ratio, stir, and mixing time 30 seconds, the sand aqueous mixtures that will clean tube then enters the sand water separation equipment to be separated;
(4) checking procedure: the damp sand after the sand water separation equipment separates, after dehydration, oven dry, check its quality to meet the requirements again, finish.
Record through test, the clay-bonded sand clay content after the regeneration is 0.19%, and 1h tensile strength is 1.05MPa, and 24h tensile strength is 2.0MPa, near the performance of fresh sand.
Embodiment 6: be used for the regenerating used of alkali base phenolic resins, comprise the steps:
(1) once clean step: pressed mass ratio 1: 3, and old sand and clear water were added respectively to clean in the tube stir, mixing time 30 seconds is discharged the sewage of cleaning tube then;
(2) secondary is cleaned step: to cleaning tube injection clear water, old sand is 1: 3 with the clear water quality ratio in the scouring tube, and adds sulfuric acid once more, stirs mixing time 300 seconds, the sewage of discharge scouring tube then; When said sulfuric acid concentration was mass percent 98.3%, addition was every kg old sand 0.25ml sulfuric acid;
Clean step (3) three times: inject clear water to cleaning tube for the third time, cleaning the tube old sand is 1: 3 with the clear water quality ratio, stir, and mixing time 300 seconds, the sand aqueous mixtures that will clean tube then enters the sand water separation equipment to be separated;
(4) checking procedure: the damp sand after the sand water separation equipment separates, after dehydration, oven dry, check its quality to meet the requirements again, finish.
Record through test, the clay-bonded sand clay content after the regeneration is 0.19%, and 1h tensile strength is 1.05MPa, and 24h tensile strength is 2.1MPa, near the performance of fresh sand.
Like Fig. 2, shown in Figure 3; Cast used sand wet reclamation equipment of the present invention comprises mixer and sand water separation device, and mixer is made up of bracing frame 7, scouring tube 12, driving cylinder 1, motor 5 and main shaft 10; Bracing frame 7 is a frame shape; Its bottom is equipped with and is cleaned tube 12, and the bracing frame upper surface is equipped with and is driven cylinder 1, and motor 5 is equipped with in the bracing frame side; Said scouring tube 12 upper surfaces have sand inlet 11 and water inlet 6, clean tube 12 bottoms and have water discharging valve 8 and sediment outflow valve 16, and water discharging valve 8 is connected with sediment outflow pipe 17 with drainpipe 9 respectively with sediment outflow valve 16;
Said main shaft 10 tops are connected with drive motors 5 through belt drive unit, and main shaft 10 upper ends are connected with the air cylinder tie rod 20 that drives cylinder 1 through interlock bearing 19, and said scouring tube 12 upper surfaces are passed in main shaft 10 bottoms, and stirring vane 13 is equipped with in main shaft 10 bottoms;
Said sediment outflow pipe 17 is communicated with sand water separation device 18.
Said interlock bearing 19 is made up of ball bearing and link, and ball bearing is fixed in link upper surface central authorities; Said belt drive unit is made up of big belt wheel 2, feed belt 3 and small pulley 4, and feed belt 3 connects big belt wheel 2 and small pulley 4, and big belt wheel 2 and wheeled pallet 21 are rotationally connected through bearing, and wheeled pallet 21 bottoms are fixed on cleans tube 12 upper surfaces;
Drive motors 5 rotating shafts and said small pulley 4 are connected through key pin, and said main shaft 10 cross sections are rectangle, and main shaft 10 tops penetrate said wheeled pallet 21 centre bores and big belt wheel 2 centre bores, are slidingly matched with wheeled pallet 21 centre bores and big belt wheel 2 centre bores; Said main shaft 10 upper ends are connected with the link lower end of said interlock bearing 19, and said air cylinder tie rod 20 lower ends embed the ball bearing of said interlock bearing 19.
Claims (4)
1. a cast used sand wet method batch (-type) renovation process is applicable to clay old sand, used sodium silicate sand and alkali phenolic resins old sand, comprises the steps:
(1) once clean step: press mass ratio 1:0.5~1:3, old sand and clear water are added respectively to clean in the tube stir, mixing time 30 seconds~300 seconds is discharged the sewage of cleaning tube then;
(2) secondary is cleaned step: to cleaning an injection clear water, old sand is 1:0.5~1:3 with the clear water quality ratio in the scouring tube once more, stir, and mixing time 30 seconds~300 seconds, the sewage of tube is cleaned in discharge then;
When sand sample is alkalescence, add hydrochloric acid or sulfuric acid during stirring, when concentration of hydrochloric acid was mass percent 37.5%, addition was every kg old sand 0.8~1.5ml hydrochloric acid; When sulfuric acid concentration was mass percent 98.3%, addition was every kg old sand 0.15~0.25ml sulfuric acid;
Clean step (3) three times: inject a clear water to the scouring tube for the third time, clean the tube old sand and be 1:0.5~1:3, stir with the clear water quality ratio, mixing time 30 seconds~300 seconds, the sand aqueous mixtures that will clean tube then enters the sand water separation equipment to be separated;
(4) checking procedure: the damp sand after the sand water separation equipment separates, after dehydration, oven dry, check its quality whether to meet the requirements again, be then to finish, otherwise change step (2).
2. an equipment that is used for the said cast used sand wet method of claim 1 batch (-type) renovation process comprises mixer and sand water separation device, it is characterized in that:
Said mixer, by bracing frame, clean tube, drive cylinder, motor and main shaft and constitute, support frame as described above is a frame shape, and its bottom is equipped with and is cleaned tube, and the driving cylinder is equipped with in the bracing frame upper surface, and motor is equipped with in the bracing frame side; Said scouring tube upper surface has sand inlet and water inlet, cleans the tube bottom and has water discharging valve and sediment outflow valve, and water discharging valve is connected with the sediment outflow pipe with drainpipe respectively with the sediment outflow valve;
Said main shaft top is connected with drive motors through belt drive unit, and the main shaft upper end is connected with the air cylinder tie rod that drives cylinder through the interlock bearing, and said scouring tube upper surface is passed in the main shaft bottom, and stirring vane is equipped with in the main shaft bottom;
Said sediment outflow pipe is communicated with the sand water separation device.
3. cast used sand wet reclamation equipment as claimed in claim 2 is characterized in that:
Said interlock bearing is made up of ball bearing and link, and ball bearing is fixed in link upper surface central authorities; Said belt drive unit is made up of big belt wheel, feed belt and small pulley, and feed belt connects big belt wheel and small pulley, and big belt wheel and wheeled pallet are rotationally connected through bearing, and the wheeled pallet bottom is fixed on cleans the tube upper surface;
Said drive motors rotating shaft is connected through key pin with said small pulley, and said main axis cross section is a rectangle, and main shaft top penetrates said wheeled pallet centre bore and big belt wheel centre bore, is slidingly matched with wheeled pallet centre bore and big belt wheel centre bore; Said main shaft upper end is connected with the link lower end of said interlock bearing, and said air cylinder tie rod lower end embeds the ball bearing of said interlock bearing.
4. like claim 2 or 3 described cast used sand wet reclamation equipment, it is characterized in that:
Said driving cylinder is hydraulic cylinder or pneumatic cylinder;
Said sand water separation device is centrifugal separating device or vibration separate equipment.
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Effective date of registration: 20171211 Address after: 014060 the Inner Mongolia Autonomous Region Baotou City South Ring Road 47 kilometers Jiuyuan Industrial Park Jun Cheng Road East Patentee after: BAOTOU SHENGYU MACHINERY MANUFACTURING Co.,Ltd. Address before: 430074 Hubei Province, Wuhan city Hongshan District Luoyu Road No. 1037 Patentee before: Huazhong University of Science and Technology |
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