CN104493074A - Method for preparing zircon-sand pre-coated sand - Google Patents
Method for preparing zircon-sand pre-coated sand Download PDFInfo
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- CN104493074A CN104493074A CN201410735426.1A CN201410735426A CN104493074A CN 104493074 A CN104493074 A CN 104493074A CN 201410735426 A CN201410735426 A CN 201410735426A CN 104493074 A CN104493074 A CN 104493074A
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- sand
- zircon
- precoated
- precoated sand
- roughing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/20—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents
- B22C1/22—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins
- B22C1/2233—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The invention discloses a method for zircon-sand pre-coated sand. The method comprises the following steps: heating raw sand; feeding heated raw sand into a sand-mixing mill, sequentially adding phenolic resin, water and an aqueous solution of urotropine so that phenolic resin and urotropine are reacted to be attached to the surface of the raw sand to form zircon-sand pre-coated sand; carrying out air cooling treatment on the zircon-sand pre-coated sand, adding calcium stearate; cooling the zircon-sand pre-coated sand and discharging the sand until the temperature is reduced to a sand-discharging temperature. The method has the technical effects that by heating the raw sand, heated raw sand is fed into the sand-mixing mill, phenolic resin, water and the aqueous solution of urotropine are sequentially added, air cooling treatment is carried out on the zircon-sand pre-coated sand, calcium stearate is added and cooling treatment is finally carried out, the technical problem that the pre-coated sand produced in the prior art is not high in tensile strength and thus the pre-coated sand is difficult to meet the casting needs is solved.
Description
Technical field
The present invention relates to machine casting technical field, particularly relates to a kind of manufacture method of zircon sand precoated sand.
Background technology
Along with our people's growth in the living standard, the quality requirement of each factory to foundry goods is also more and more higher.Precoated sand because of its there is good fluidity, intensity is high, foundry goods, without effects such as sand holes, widely uses in casting field.Zircon sand relatively and other roughing sand as precoated sand there is good thermal conductivity, be applicable to the foundry goods high to quality requirement.
In prior art, the preparation method of precoated sand adopts ethanol by resin dissolves, and adds methenamine in mulling process, makes resin and methenamine be coated on sand grain surface, after ethanol volatilization, thus obtains precoated sand.
But by the method for above-mentioned making zircon sand precoated sand, the tensile strength of the precoated sand made is not high, is difficult to reach casting demand.
Summary of the invention
The invention provides a kind of manufacture method of zircon sand precoated sand, not high with the tensile strength overcoming the precoated sand made, be difficult to the technical problem reaching casting demand.
The invention provides a kind of manufacture method of zircon sand precoated sand, comprising:
Roughing sand is heated;
Described roughing sand after heating is sent in mulling stone roller, in succession adds phenolic resins, water, the methenamine aqueous solution, phenolic resins and methenamine are reacted and is attached to described roughing sand surface, form zircon sand precoated sand;
Calcium stearate is added after air-cooled process is carried out to described zircon sand precoated sand;
Cool described zircon sand precoated sand, shake out when temperature is down to and is shaked out temperature.
Further, before roughing sand heats by step, also comprise
Old sand is directly sent in regenerating furnace and heats, dispose for materials such as the resins by old sand surface, form regeneration precoated sand;
Through water cooling, described regeneration precoated sand temperature is reduced.
Further, described roughing sand is zircon sand.
Further, described being added by roughing sand, hankers, and heating-up temperature is 130 DEG C ~ 180 DEG C.
Further, describedly described roughing sand after heating is sent into during mulling grinds, in succession add phenolic resins, water, the methenamine aqueous solution, phenolic resins and methenamine are reacted and is attached to described roughing sand surface, in formation zircon sand precoated sand,
After adding described phenolic resins, the mulling time is 20-80s;
After adding described water, the mulling time is 3-7s;
After adding the described methenamine aqueous solution, the mulling time is 10-20s.
Further, described air-cooled process is carried out to described zircon sand precoated sand after add in calcium stearate,
The time of described air-cooled process is 80-120s;
After adding calcium stearate, the mulling time is 10-20s.
Further, temperature of shaking out described in is less than or equal to 55 DEG C.
Technique effect of the present invention is: by heating roughing sand, described roughing sand after heating is sent in mulling stone roller, in succession add phenolic resins, water, the methenamine aqueous solution and add calcium stearate after air-cooled process is carried out to described zircon sand precoated sand, finally carry out the processing procedure cooled, the tensile strength solving the precoated sand produced in prior art is not high, is difficult to the technical problem reaching casting demand.
Accompanying drawing explanation
Fig. 1 is the bond state figure of sand grains in precoated sand solidification process of the present invention;
Fig. 2 is the flow chart of the manufacture method embodiment one of zircon sand precoated sand of the present invention;
Fig. 3 is the flow chart that the manufacture method of zircon sand precoated sand of the present invention executes example two.
Detailed description of the invention
Fig. 1 is the bond state figure of sand grains in precoated sand solidification process of the present invention.
Zircon sand precoated sand is formulated by base stocks such as zircon sand, phenolic resins, methenamine, calcium stearates.In precoated sand, sand grains bond state directly affects the performance of precoated sand.As shown in Figure 1, the bond state of precoated sand sand grains has four kinds, and a is non-bond state; B is incomplete adhesive tape state, forms the adhesive tape less with sand grains stick area; C is complete adhesive tape state, and resin forms double moon shaped adhesive tape between sand grains; D is thin double moon shaped adhesive tape state, after resin softens between sand grains flowing time long and formed adhesive tape.In order to reach the high-tensile requirement of precoated sand, the bond state of precoated sand sand grains need reach complete adhesive tape state.
Fig. 2 is the flow chart of the manufacture method embodiment one of zircon sand precoated sand of the present invention
The invention provides a kind of manufacture method of zircon sand precoated sand, comprising:
Step 102, heats roughing sand;
Wherein, heating-up temperature can be 130-180 DEG C, and this temperature is relatively applicable to following material and reacts, and overlay film is effective.At suitable temperature, make roughing sand decompose the methylene provided in the curing process with methenamine and cross-linking reaction better occurs form netted or bodily form molecular structure and play cementation, increase precoated sand intensity.
Step 103, sends into the described roughing sand after heating in mulling stone roller, in succession adds phenolic resins, water, the methenamine aqueous solution, phenolic resins and methenamine is reacted and is attached to described roughing sand surface, form zircon sand precoated sand;
Wherein, after adding described phenolic resins, the mulling time is 20-80s; After adding described water, the mulling time is 3-7s; After adding the described methenamine aqueous solution, the mulling time is 10-20s.
Step 104, adds calcium stearate after carrying out air-cooled process to described zircon sand precoated sand;
The time of described air-cooled process is 80-120s; After adding calcium stearate, the mulling time is 10-20s.
Step 105, cools described zircon sand precoated sand, shakes out when temperature is down to and is shaked out temperature.
Described temperature of shaking out is less than or equal to 55 DEG C, avoids the too high easy generation caking of temperature.
The method that the present embodiment provides, by heating roughing sand, described roughing sand after heating is sent in mulling stone roller, in succession add phenolic resins, water, the methenamine aqueous solution and add calcium stearate after air-cooled process is carried out to described zircon sand precoated sand, finally carry out the processing procedure cooled, the tensile strength solving the precoated sand produced in prior art is not high, is difficult to the technical problem reaching casting demand.
Fig. 3 is the flow chart that the manufacture method of zircon sand precoated sand of the present invention executes example two, and the manufacture method of the zircon sand precoated sand of the present embodiment according to embodiment one, before step 102, also comprises:
Step 100, directly sends into old sand in regenerating furnace and heats, and disposes, form regeneration precoated sand for materials such as the resins by useless husky surface;
Step 101, through water cooling, makes described regeneration precoated sand temperature reduce.
Optionally, old sand can be the precoated sand after knockout, and shaping foundry goods is mainly separated with sand mold due to the vibrations of shakeout by the precoated sand after knockout, then is sent in regenerating furnace by old sand by the sieve bottom shakeout.Old sand can also for treating useless shell mould after foundry goods after crusher in crushing and resin isolation.Knockout is sent in regenerating furnace in succession and heats.
Wherein, regenerating furnace is heated to 500-600 DEG C, for the resin on old sand surface, methenamine etc. being removed through high temperature sintering.
The present embodiment heats by directly being sent in regenerating furnace by old sand, the materials such as the resin on useless husky surface are disposed, forms regeneration precoated sand and through water cooling, after described regeneration precoated sand temperature is reduced, old sand reused as roughing sand, to old sand recycling, reduce production cost.
Below to put into 160kg zircon sand in concrete often stone roller, be specifically described.
First temperature 130-180 DEG C is heated to zircon sand, subsequently the zircon sand after heating is sent into mulling and grind, put into 160kg zircon sand in often grinding and mix; In succession add phenolic resins 3.3kg in order, mulling 20-80s, wherein, phenolic resins addition accounts for 1.8% ~ 2.8% of zircon sand addition, and phenolic resins accounts for 2.06% of zircon sand addition as preferred.Add mulling 3-7s after water; Add methenamine aqueous solution 1.5L, mass fraction 45%, wherein, the addition of methenamine is larger to the curing rate of precoated sand, intensity effect, methenamine addition accounts for 16% ~ 26% of phenolic resins addition, account for 20% of phenolic resins addition as preferred, and mulling 10-20s, form zircon sand precoated sand.Carry out air-cooled process subsequently, the time of air-cooled process is 80-120s.Avoid mulling in mulling process to grind temperature can increase, after exceeding certain temperature range, phenolic resins and methenamine can not better react and be attached to zircon sand surface, cause mulling poor effect.Add calcium stearate 0.2kg again, mulling 10-20s.Wherein, calcium stearate addition accounts for phenolic resins addition 4% ~ 6%, and calcium stearate addition accounts for 6% of phenolic resins addition the most preferably, can increase precoated sand mobility.Zircon sand precoated sand is cooled, shakes out when temperature will be down to below 55 DEG C, avoid the too high caking caused of temperature.
Further, in the present embodiment, described zircon sand adopts 70/150 order zircon sand, described phenolic resins adopts high strength resin dedicated, and the resin dedicated addition of high strength is 1.3%-2.3%, the zircon sand precoated sand room temperature tensile strength of production is 4.0-4.5MPa, hot tensile strength 2.0-2.5MPa, gas forming amount≤12ml/g, fusing point 88 ~ 94 DEG C.This zircon sand precoated sand has the characteristic of high strength, low gas forming amount, and has good non-oxidizability and durability is good, and recovery utilization rate is up to more than 95%.
In actual applications, when the hot tensile strength <1.8MPa of precoated sand, room temperature tensile strength <3.5MPa, be defective zircon sand precoated sand, need by the reclaiming of defective zircon sand precoated sand.
Last it is noted that above embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (7)
1. a manufacture method for zircon sand precoated sand, is characterized in that, comprising:
Roughing sand is heated;
Described roughing sand after heating is sent in mulling stone roller, in succession adds phenolic resins, water, the methenamine aqueous solution, phenolic resins and methenamine are reacted and is attached to described roughing sand surface, form zircon sand precoated sand;
Calcium stearate is added after air-cooled process is carried out to described zircon sand precoated sand;
Cool described zircon sand precoated sand, shake out when temperature is down to and is shaked out temperature.
2. the manufacture method of zircon sand precoated sand according to claim 1, is characterized in that, before roughing sand heats by step, also comprises
Old sand is directly sent in regenerating furnace and heats, dispose for materials such as the resins by old sand surface, form regeneration precoated sand;
Through water cooling, described regeneration precoated sand temperature is reduced.
3. the manufacture method of zircon sand precoated sand according to claim 1 and 2, is characterized in that, described roughing sand is zircon sand.
4. the manufacture method of zircon sand precoated sand according to claim 3, is characterized in that, described being added by roughing sand hankers, and heating-up temperature is 130 DEG C ~ 180 DEG C.
5. the manufacture method of zircon sand precoated sand according to claim 1, it is characterized in that, described by the described roughing sand feeding mulling stone roller after heating, in succession add phenolic resins, water, the methenamine aqueous solution, phenolic resins and methenamine are reacted and is attached to described roughing sand surface, formed in zircon sand precoated sand
After adding described phenolic resins, the mulling time is 20-80s;
After adding described water, the mulling time is 3-7s;
After adding the described methenamine aqueous solution, the mulling time is 10-20s.
6. the manufacture method of zircon sand precoated sand according to claim 1, is characterized in that, described air-cooled process is carried out to described zircon sand precoated sand after add in calcium stearate,
The time of described air-cooled process is 80-120s;
After adding calcium stearate, the mulling time is 10-20s.
7. the manufacture method of zircon sand precoated sand according to claim 1, is characterized in that,
Described temperature of shaking out is less than or equal to 55 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410735426.1A CN104493074A (en) | 2014-12-05 | 2014-12-05 | Method for preparing zircon-sand pre-coated sand |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410735426.1A CN104493074A (en) | 2014-12-05 | 2014-12-05 | Method for preparing zircon-sand pre-coated sand |
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| CN104493074A true CN104493074A (en) | 2015-04-08 |
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| CN201410735426.1A Pending CN104493074A (en) | 2014-12-05 | 2014-12-05 | Method for preparing zircon-sand pre-coated sand |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104889313A (en) * | 2015-04-24 | 2015-09-09 | 北京仁创科技集团有限公司 | Coated sand preparation method |
| CN106807881A (en) * | 2017-02-06 | 2017-06-09 | 柳州市柳晶科技有限公司 | Casting precoated sand and its manufacture method |
| CN112344354A (en) * | 2020-09-15 | 2021-02-09 | 盐城仁创砂业科技有限公司 | Tail gas treatment process for mixed precoated sand |
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| CN101249547A (en) * | 2008-03-24 | 2008-08-27 | 山东时风（集团）有限责任公司 | Tooth form part foundry technique method |
| CN102688977A (en) * | 2012-06-12 | 2012-09-26 | 西峡县众德汽车部件有限公司 | High-strength core-preparing precoated sand and preparation process thereof |
| CN103317084A (en) * | 2013-06-28 | 2013-09-25 | 常州午阳柴油机水箱制造有限公司 | Waste sand recycling equipment and use method thereof |
| CN104190854A (en) * | 2014-08-19 | 2014-12-10 | 重庆市大足区和润机械配件有限公司 | Regenerated pre-coated sand and preparation method thereof |
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2014
- 2014-12-05 CN CN201410735426.1A patent/CN104493074A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101249547A (en) * | 2008-03-24 | 2008-08-27 | 山东时风（集团）有限责任公司 | Tooth form part foundry technique method |
| CN102688977A (en) * | 2012-06-12 | 2012-09-26 | 西峡县众德汽车部件有限公司 | High-strength core-preparing precoated sand and preparation process thereof |
| CN103317084A (en) * | 2013-06-28 | 2013-09-25 | 常州午阳柴油机水箱制造有限公司 | Waste sand recycling equipment and use method thereof |
| CN104190854A (en) * | 2014-08-19 | 2014-12-10 | 重庆市大足区和润机械配件有限公司 | Regenerated pre-coated sand and preparation method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104889313A (en) * | 2015-04-24 | 2015-09-09 | 北京仁创科技集团有限公司 | Coated sand preparation method |
| CN104889313B (en) * | 2015-04-24 | 2019-01-18 | 北京仁创科技集团有限公司 | A kind of precoated sand preparation method |
| CN106807881A (en) * | 2017-02-06 | 2017-06-09 | 柳州市柳晶科技有限公司 | Casting precoated sand and its manufacture method |
| CN112344354A (en) * | 2020-09-15 | 2021-02-09 | 盐城仁创砂业科技有限公司 | Tail gas treatment process for mixed precoated sand |
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| CB02 | Change of applicant information |
Address after: 161002 locomotive Road 55, Yangming District, Heilongjiang, Mudanjiang Applicant after: Mudanjiang Zhongche Jinyuan Casting Industry Co. Address before: 157013 Heilongjiang province Mudanjiang City Yangming District Road No. 55 locomotive Applicant before: Mudanjiang Jinyuan Draw Gear and Draft Gear Manufacturing Limited Company |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150408 |
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| RJ01 | Rejection of invention patent application after publication |