CN104162628A - Method and device for peeling off attachments on surfaces of waste casting sands - Google Patents
Method and device for peeling off attachments on surfaces of waste casting sands Download PDFInfo
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- CN104162628A CN104162628A CN201310181826.8A CN201310181826A CN104162628A CN 104162628 A CN104162628 A CN 104162628A CN 201310181826 A CN201310181826 A CN 201310181826A CN 104162628 A CN104162628 A CN 104162628A
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- sand
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Abstract
The invention discloses a method and device for peeling off the attachments on the surfaces of waste casting sands. The method is characterized in that sands are soaked in a water solution with a certain alkalinity to remove the attachments from the surfaces of the sands without using a machinery friction method or a high temperature burning method to remove the attachments on the sand surfaces so as to completely recycle the waste casting sands, and during the process no waste is generated. The basic operations of the technology device comprise: soaking to remove the attachments, slag ash separation, dehydration drying, and circulation water filtering.
Description
Technical field
Peel off method and the device for carrying out said thereof of casting mold waste sand sand grain surface adhesive.This place speech " sand grains " comprises quartz sand, chromite sand, ceramic particle and other ore particles.This place speech " adhesion " comprises resin, dehydration waterglass, inorganic salt minerals and the metal oxide of curing (sclerosis).
Background technology
Existing casting mold sand regenerating treater is of a great variety, but the method adopting can be classified as mechanical friction and heating.Wherein mechanical friction type comprises: direct friction, for example patent announcement CN 101868310 B; In air-flow, rub, for example patent announcement CN 102655964 A; In current, rub, for example patent announcement CN 102615243 A.Wherein heating type comprises: by the high-temperature heating of organic principle after-flame, and for example patent announcement CN 2859431 Y; Then first heating adopts the heating of mechanical friction, and this is the way the most generally adopting in reality, and this type of heater is patent announcement CN 2751938 Y for example.
Applicant is familiar with as follows by a large amount of experimental studies: sand grains and adhesive difference on hard fragility energy is very big, and mechanical friction method is before fully removing adhesive, and sand grains noticeable wear is pulverized.Adopt the high-temperature heating can after-flame organic matter (although being also not easy), the alkali metal oxide staying, alkali metal salt, silicate be more fine and close equably by coated grains of sand surface by melting meeting.
CN 102615243 A have also proposed the method for pickling.No matter resinoid bond or waterglass, further polymerization bonding all under acid condition, instead of clear up and slough, this is principles well-known.
In reality, situation is, the reclaimed sand that existing old sand processing means obtain can not meet the instructions for use at the positions such as casting mold inner surface, core, need use fresh sand at these positions; Or need add generally part fresh sand could use.The ratio that produced therefrom does not wait but enormous amount discarded.According to China Association of Casting's data, annual 3000 ten thousand tons of the cast waste sands above (article numbering 100028365 (2009) 0320399205) that produce of China, account for 50% of global similar discarded object at present.
Casting mold antiquated sand especially resin sand is environment harmful, containing aldehyde, phenol, furans, bioxin (heating produces).Wherein furans, bioxin is the persistence organic pollutant (POPs) that Convention of Stockholm is listed.
Casting mold sand is expensive resource.
Summary of the invention
For the present situation of casting mold sand treatment technology, this technique looks for another way, be intended to effectively to peel off waste sand adhesive make its acquisition can be used in casting mold any part, also can single use surface property.
The feature of this technique is to adopt the aqueous solution soaking sand grains of certain basicity that adhesive is come off, and its substantive distinguishing features is the regeneration that the invasion and attack to sand grain surface instead of the method according to resistance to mechanical friction or high temperature after-flame realize waste sand by alkaline solution.
Aqueous solution free alkalinity, for be regenerated as >=0.1mol/L of alkali phenolic resins waste sand, for be regenerated as >=0.4mol/L of waterglass waste sand.
The elemental operation link of implementing above-mentioned technique comprise soak de-adhesive, separate slag ash, dehydrate, recirculated water filters.Elemental operation link forms in function complies with resistance to utility system mutually, is the necessary condition that technique realizes.
In above-mentioned link, can optionally add magnetic separation, graded operation.
The device for carrying out said being made up of above-mentioned cargo handling operation is different from existing casting mold sand preparation plant, and existing apparatus is made up of links such as fragmentation, heating, friction, selection by winnowing conventionally.
Adopt the reclaimed sand of this technology acquisition, recovered the true colours of sand grains, also recovered the surface property of sand grains.Result of implementation (in table 1) shows, the technical performance of reclaimed sand has reached fresh sand level, both can be used as facing sand, core sand, also can make system sand and use, and realized casting mold sand and recycled completely, has significant economic benefit and environmental benefit.
Brief description of the drawings
Separate adhesive slag ash and can before dehydrating, carry out (Fig. 1), also can after dehydrating, carry out (Fig. 2).
The equipment that soaks de-adhesive is made up of obtain solution, the container that holds sand grains.
Separate adhesive slag ash and adopt separation in streaming current, pneumatic separation or screening plant.
The equipment of sand grains dehydration adopts spiral separator, vibratory sieve and centrifuge.The dry employing dryer of sand grains or naturally dry.
Recirculated water filter cleaner is by precipitating concentrate container and filter forms.
In above-mentioned work flow, can insert magnetic separating equipment to remove the iron and steel foreign material in shakeout and chromite sand is separated.
In above-mentioned work flow, the equipment that can comprise current classification, air current classifying, vibration separation and screening is divided into sand grains the group of different-grain diameter.
Detailed description of the invention
Embodiment 1
Adopt the aqueous solution of technical grade NaOH preparation free alkalinity 0.1mol/L, after immersion alkali phenolic resins antiquated sand, separate with current cyclone the slag ash coming off, by the pure sand grains centrifuge dewatering obtaining, naturally dry.Coordinate alkali phenolic resin adhesive to make sample with reclaimed sand by " foundry sand and test mixture method (GB/T 2684) " and do tensile strength test.
Embodiment 2
Adopt the aqueous solution of technical grade potassium hydroxide preparation free alkalinity 0.2mol/L, after immersion alkali phenolic resins antiquated sand, with high frequency shale shaker dehydration, with dryer, sand grains is dried, then separate with pneumatic separator the slag ash coming off.Coordinate alkali phenolic resin adhesive to make sample with reclaimed sand by " foundry sand and test mixture method (GB/T 2684) " and do tensile strength test.
Embodiment 3
Adopt the aqueous solution of technical grade NaOH preparation free alkalinity 0.4mol/L, after immersion waterglass antiquated sand, separate with current cyclone the slag ash coming off, by the pure sand grains centrifuge dewatering obtaining, naturally dry.Coordinate producing modified organic water-glass bonder to make sample with reclaimed sand by " foundry sand and test mixture method (GB/T 2684) " and do tensile strength test.
Embodiment 4
Adopt steel plant's alkaline waste water, its free alkalinity is adjusted to 0.2mol/L with calcium oxide, after immersion alkali phenolic resins antiquated sand, separate with rotary screen the slag ash coming off, by the pure sand grains centrifuge dewatering obtaining, adopt dryer that sand grains is dried.Coordinate alkali phenolic resin adhesive to make sample with reclaimed sand by " foundry sand and test mixture method (GB/T 2684) " and do tensile strength test.
Embodiment 5
Adopt steel plant's alkaline waste water, its free alkalinity is adjusted to 0.5mol/L with calcium oxide, after immersion waterglass antiquated sand, with high frequency shale shaker dehydration, with dryer, sand grains is dried, then separate with cyclone separator the slag ash coming off.Coordinate producing modified organic water-glass bonder to make sample with reclaimed sand by " foundry sand and test mixture method (GB/T 2684) " and do tensile strength test.
Embodiment 6
Adopt the aqueous solution of technical grade NaOH preparation free alkalinity 0.4mol/L, soak after waterglass antiquated sand and to separate the slag ash that comes off and by sand-grading, by the pure sand centrifuge dewatering of acquisition, naturally to dry with spiral chute.Coordinate producing modified organic water-glass bonder to make sample with reclaimed sand by " foundry sand and test mixture method (GB/T 2684) " and do tensile strength test.
In above-described embodiment containing the water of cast slag ash through precipitate concentrated after with Filter Press, filtrate cycle is used.
Comparative example 1
Coordinate alkali phenolic resin adhesive to make sample with the alkali phenolic aldehyde reclaimed sand of the existing regenerating unit processing of factory by " foundry sand and test mixture method (GB/T 2684) " and do tensile strength test.This regenerating unit comprises rotary kiln heating, one-level vibration rubbing machine, two-stage centrifugal rubbing machine and Winnowing separator.This reclaimed sand does floor sand in sampling place factory and uses, and need purchase fresh sand and make facing sand, thereby have 18% old sand discarded.
Comparative example 2
Coordinate producing modified organic water-glass bonder to make sample with the waterglass reclaimed sand of existing regenerating unit processing by " foundry sand and test mixture method (GB/T 2684) " and do tensile strength test.This regenerating unit comprises shaft furnace heating, one-level vibration rubbing machine, two-stage centrifugal rubbing machine and Winnowing separator.This reclaimed sand is made floor sand in sampling place factory and is used, and need purchase fresh sand and make facing sand, thereby have 26% old sand discarded.
Comparative example 3
Getting factory's fresh sand used coordinates producing modified organic water-glass bonder to make sample by " foundry sand and test mixture method (GB/T 2684) " to do tensile strength test.
Comparative example 4
Getting factory's fresh sand used coordinates producing modified organic water-glass bonder to make sample by " foundry sand and test mixture method (GB/T 2684) " to do tensile strength test.
Test result is listed in table 1.Test condition: organic grease hardening agent consumption, alkali phenol resin sand is resin demand 20%, modified sodium silicate sand is 10% of waterglass consumption.21 DEG C of test environment temperature.
Table 1
| Sample | Consumption of binder, % | 24h tensile strength, MPa |
| Embodiment 1 | 1.4 | 0.41 |
| Embodiment 2 | 1.4 | 0.35 |
| Embodiment 3 | 2.0 | 2.56 |
| Embodiment 4 | 1.4 | 0.30 |
| Embodiment 5 | 2.0 | 2.41 |
| Embodiment 6 | 2.0 | 2.46 |
| Comparative example 1 | 1.4 | 0.11 |
| Comparative example 2 | 2.0 | 1.05 |
| Comparative example 3 | 1.4 | 0.38 |
| Comparative example 4 | 2.0 | 2.53 |
The above results shows, the reclaimed sand performance that this technical finesse obtains has reached fresh sand level, can directly make facing sand or system sand and use, no longer discarded old sand.
Claims (3)
1. peel off the process of casting mold waste sand surface adhesive, it is characterized in that adopting the aqueous solution soaking waste sand of certain free alkalinity, adhesion is come off from sand grain surface.
2. aqueous solution free alkalinity according to claim 1, for be regenerated as >=0.1mol/L of alkali phenolic resins waste sand, for be regenerated as >=0.4mol/L of waterglass waste sand.
3. process according to claim 1, its device for carrying out said elemental operation link by soaking de-adhesive, separate slag ash, dehydrate, recirculated water filters and forms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310181826.8A CN104162628A (en) | 2013-05-16 | 2013-05-16 | Method and device for peeling off attachments on surfaces of waste casting sands |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310181826.8A CN104162628A (en) | 2013-05-16 | 2013-05-16 | Method and device for peeling off attachments on surfaces of waste casting sands |
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| CN104162628A true CN104162628A (en) | 2014-11-26 |
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| CN201310181826.8A Pending CN104162628A (en) | 2013-05-16 | 2013-05-16 | Method and device for peeling off attachments on surfaces of waste casting sands |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104625029A (en) * | 2015-01-20 | 2015-05-20 | 华中科技大学 | Aluminum or magnesium alloy casting sand core removing device and method |
| CN105921690A (en) * | 2016-05-26 | 2016-09-07 | 合肥市田源精铸有限公司 | Treatment method for furan resin self-hardening sand |
| CN105945217A (en) * | 2016-05-26 | 2016-09-21 | 合肥市田源精铸有限公司 | Treatment method of phenolic resin self-hardening sand |
| 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 |
| CN106001401A (en) * | 2016-05-26 | 2016-10-12 | 合肥市田源精铸有限公司 | Regeneration treatment method for old sand of phenolic resin self-hardening sand |
| CN106001400A (en) * | 2016-05-26 | 2016-10-12 | 合肥市田源精铸有限公司 | Preparation method of furan resin self-hardening sand |
| CN106040969A (en) * | 2016-05-26 | 2016-10-26 | 合肥市田源精铸有限公司 | Preparation method for phenolic resin self-hardening sand |
| CN106607546A (en) * | 2016-08-31 | 2017-05-03 | 圣固（江苏）机械有限公司 | Coated sand recycling method |
| CN110405136A (en) * | 2019-09-04 | 2019-11-05 | 北京仁创砂业铸造材料有限公司 | A kind of the wet reclamation additive and regeneration method of silicate cast used sand |
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| JPS5684147A (en) * | 1979-12-13 | 1981-07-09 | Sintokogio Ltd | Treatment of recovered casting sand |
| CN2259243Y (en) * | 1996-05-30 | 1997-08-13 | 青岛第四铸造机械厂 | Resin bonded sand regenerator for foundry practice use |
| CN1312220A (en) * | 2001-01-17 | 2001-09-12 | 上海交通大学 | Chemical restoring process of organic ester hardened old water glass sand |
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- 2013-05-16 CN CN201310181826.8A patent/CN104162628A/en active Pending
Patent Citations (3)
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| JPS5684147A (en) * | 1979-12-13 | 1981-07-09 | Sintokogio Ltd | Treatment of recovered casting sand |
| CN2259243Y (en) * | 1996-05-30 | 1997-08-13 | 青岛第四铸造机械厂 | Resin bonded sand regenerator for foundry practice use |
| CN1312220A (en) * | 2001-01-17 | 2001-09-12 | 上海交通大学 | Chemical restoring process of organic ester hardened old water glass sand |
Non-Patent Citations (2)
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| 张景德等: "旧砂再生技术的现状与展望", 《山东工业大学学报》, vol. 22, no. 3, 31 December 1992 (1992-12-31) * |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104625029A (en) * | 2015-01-20 | 2015-05-20 | 华中科技大学 | Aluminum or magnesium alloy casting sand core removing device and method |
| CN104625029B (en) * | 2015-01-20 | 2016-08-17 | 华中科技大学 | A kind of aluminum or Mg alloy castings core cleaning plant and core method for cleaning thereof |
| CN105921690A (en) * | 2016-05-26 | 2016-09-07 | 合肥市田源精铸有限公司 | Treatment method for furan resin self-hardening sand |
| CN105945217A (en) * | 2016-05-26 | 2016-09-21 | 合肥市田源精铸有限公司 | Treatment method of phenolic resin self-hardening sand |
| CN106001401A (en) * | 2016-05-26 | 2016-10-12 | 合肥市田源精铸有限公司 | Regeneration treatment method for old sand of phenolic resin self-hardening sand |
| CN106001400A (en) * | 2016-05-26 | 2016-10-12 | 合肥市田源精铸有限公司 | Preparation method of furan resin self-hardening sand |
| CN106040969A (en) * | 2016-05-26 | 2016-10-26 | 合肥市田源精铸有限公司 | Preparation method for phenolic resin self-hardening sand |
| 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 |
| CN110405136A (en) * | 2019-09-04 | 2019-11-05 | 北京仁创砂业铸造材料有限公司 | A kind of the wet reclamation additive and regeneration method of silicate cast used sand |
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Application publication date: 20141126 |