CN107282877B - A method of regeneration recycles sodium silicate sand - Google Patents
A method of regeneration recycles sodium silicate sand Download PDFInfo
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- CN107282877B CN107282877B CN201710610872.3A CN201710610872A CN107282877B CN 107282877 B CN107282877 B CN 107282877B CN 201710610872 A CN201710610872 A CN 201710610872A CN 107282877 B CN107282877 B CN 107282877B
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- sand
- sodium silicate
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- regeneration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
- B22C5/18—Plants for preparing mould materials
- B22C5/185—Plants for preparing mould materials comprising a wet reclamation step
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- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The present invention relates to a kind of methods that regeneration recycles sodium silicate sand, in molding sand casting when pouring cast part condensation is cooled to 500 ± 50 DEG C, waterglass sand mold is impacted with high pressure water flow sequence, keep the complete erosion of sand mold defeated and dispersed at loose sand, obtain the single treatment sand containing remaining silicic acid gel, the HF aqueous acids of single treatment sand low concentration are impregnated, agitation and filtration obtains after-treatment sand, after-treatment sand is rinsed, drying, reclaimed sand is obtained after sieving, according to fresh sand account for 60% 80% and reclaimed sand account for 20 40% weight ratio mixing, addition dispersant is fabricated to new waterglass sand mold.Regeneration efficiency of the present invention is high, and at low cost, pollution-free, clean environment firendly is a kind of novel green sodium silicate sand regeneration method.
Description
Technical field
The present invention relates to a kind of methods that wet reclamation recycles sodium silicate sand, especially suitable for various with excellent
The CO of collapsibility2Air hardening sodium silicate sand.
Background technology
Water-glass sand mold casting since moulding is efficient, at low cost, it is easy to operate the features such as, obtained in recent years extensive
Using.China is Metal casting producer, and casting output has occupied second place of the world, and wherein sand casting accounts for the exhausted big portion in foundry industry
Divide (80%~90%).Sand casting needs a large amount of molding sand that could be produced, and according to statistics, China often produces 1t castings can
Generate about 1.2t antiquated sands.The a large amount of cast waste sand discharged every year will occupy many antiquated sand places, can also influence environment.
Due to the defect of molding sand collapsibility difference existing for sand casting and regenerating used recycling difficulty, it is again limited into one
The development of step, although numerous modifying agent, dispersant and regenerating used technology etc. are by application, collapsibility and the old sand of putting into production in succession
Regeneration issues have obtained corresponding improvement, but will produce the problems such as sand bond declines, regenerating used technical costs is high, nothing again
Method obtains large-scale promotion.103056291 A of patent CN disclose a kind of reclaiming method of used sodium silicate sand, by water glass
Glass old sand swing crushing, removes impurity, and the breaking type fineness of sand is 20-40 mesh；High temperature wash, heat the water to 90 DEG C with
On, then broken used sodium silicate sand particle poured into, it is stirred, washes by rubbing with the hands, the adhensive membrane on removal grains of sand surface；It will be washed
Waterglass particle afterwards is dried with 300-350 DEG C of high temperature, implements dry reclamation, remove sodium oxide molybdena in old sand, dust and
Remaining sinter.This method is also of high cost, and utilization rate is low.
Invention content
A kind of method that regeneration recycles sodium silicate sand is provided the purpose of the present invention is overcoming above-mentioned insufficient, the party
Method is at low cost, pollution-free, and recovery utilization rate is high, effect is good.
The technical solution that the present invention takes is：
A method of regeneration recycles sodium silicate sand, including steps are as follows：
(1) in molding sand casting when pouring cast part condensation is cooled to 500 ± 50 DEG C water glass is impacted with high pressure water flow sequence
Glass sand mold keeps the complete erosion of sand mold defeated and dispersed into loose sand, this process sand grains is mutually hit with flow to be rubbed and be quickly cooled down, and is glued
The part silicic acid gel mould swelling cracking for being attached to sand grain surface falls off, and dispersant is fully immersed into water in sand mold, with sand grains point
From to obtain the single treatment sand containing remaining silicic acid gel；
(2) the HF aqueous acids of single treatment sand low concentration are impregnated, agitation and filtration, makes to be adhered to sand grain surface remnants
Silicic acid gel erode after obtain after-treatment sand, heating, drying after after-treatment sand is rinsed with clear water, be sieved 40 mesh after
Obtain reclaimed sand；
(3) it accounts for 60%-80% according to fresh sand and reclaimed sand accounts for the weight ratio mixing of 20-40%, addition dispersant makes
The waterglass sand mold of Cheng Xin.
The preferred CO of waterglass sand mold in the above method described in step (1)2Air hardening waterglass sand mold；The dispersant is
CO2Air hardening waterglass sand mold often uses dispersant, dispersant that is preferably hydrophilic or being dissolved in water.
The high pressure water flow is with speed order's erosion sand mold of the pressure of 0.1-0.4MPa and 4-10mm/s.
The silicic acid gel can be swollen the part that cracking falls off and account for 40 ± 5wt%, and nubbin accounts for 60 ± 5wt%.
The mass concentration range 1-10% of the HF aqueous acids of low concentration described in step (2), the time of soaking and stirring is
5-20 minutes.
Dispersant described in step (3) is preferably hydrophilic or can be dissolved in the dispersant of water.
The method of the present invention uses wet reclamation, water used can be recycled, and not will produce dust pollution, no sewage row
It puts, high pressure water flow can thoroughly break up sand mold, and remove about 40% silicic acid gel generated in dispersant and solidification process；It is old
Sand regeneration efficiency is high, can reach 90% or more, and the performance indicator of manufactured mixed sand is not much different with fresh sand after recycling, has excellent
Good collapsibility can meet the requirement of sand casting；At low cost, pollution-free, clean environment firendly of the invention, is a kind of novel green water
Glass molding sand regeneration method.
Specific implementation mode
It is further illustrated with reference to specific embodiment.
The molding sand of institute of embodiment of the present invention regeneration treatment is the CO added with dispersant2Air hardening sodium silicate sand has excellent
Good collapsibility, behind with the new CO of reclaimed sand system2Also the dispersant of same amount of the same race is added when air hardening waterglass sand mold.Dispersant selects
With conventional hydrophilic or dispersant, such as kaolin, starch, saccharin etc. that water can be dissolved in.
Embodiment 1
A method of regeneration recycles sodium silicate sand, including steps are as follows：
(1) with the CO added with dispersant2Air hardening sodium silicate sand sand mold, to after sand mold pouring cast part, when cast is cast
Part condensation is when being cooled to 500 DEG C, with high pressure water flow with speed order's erosion sand mold of the pressure of 0.1-0.4MPa and 4-10mm/s,
Keep the complete erosion of sand mold defeated and dispersed into loose sand, 500 DEG C of sand grains mutually hits friction, and fast quickly cooling with high pressure water flow during this
But, be adhered to sand grain surface account for about 40% silicic acid gel mould swelling cracking fall off, dispersant is fully immersed into water in sand mold,
With quartzy sand separation, the single treatment sand containing remaining about 60% silicic acid gel is obtained；
(2) the HF aqueous acids soaking and stirring of single treatment sand 5wt% concentration is filtered after ten minutes, makes to be adhered to sand
The silicic acid gel of grain surface residual obtains after-treatment sand after eroding, heating, drying after after-treatment sand is rinsed with clear water,
It is sieved after 40 mesh and obtains reclaimed sand；
(3) according to fresh sand account for 70% and reclaimed sand account for 30% weight ratio mix, addition dispersant be fabricated to new CO2
Air hardening waterglass sand mold.
Embodiment 2
A method of regeneration recycles sodium silicate sand, and for step with embodiment 1, difference is step (3) according to new
Sand account for 80% and reclaimed sand account for 20% weight ratio mixing, addition dispersant be fabricated to new CO2Air hardening waterglass sand mold.
Embodiment 3
A method of regeneration recycles sodium silicate sand, and for step with embodiment 1, difference is step (3) according to new
Sand account for 60% and reclaimed sand account for 40% weight ratio mixing, addition dispersant be fabricated to new CO2Air hardening waterglass sand mold.
Table 1 is the performance comparison data of fresh sand of the present invention, reclaimed sand and embodiment mixed sand, it is seen that manufactured mixed after recycling
The performance indicator for closing sand is not much different with fresh sand, has excellent collapsibility.
Table 1
It is that the present invention is discussed in detail in conjunction with specific embodiments above, protection scope of the present invention is without being limited thereto.
Claims (6)
1. a kind of method that regeneration recycles sodium silicate sand, characterized in that including steps are as follows：
(1) in molding sand casting when pouring cast part condensation is cooled to 500 ± 50 DEG C water-glass sand is impacted with high pressure water flow sequence
Type keeps the complete erosion of sand mold defeated and dispersed at loose sand, and the high pressure water flow is with the speed of the pressure of 0.1-0.4MPa and 4-10mm/s
Sequence erosion sand mold, this process sand grains is mutually hit with flow to be rubbed and is quickly cooled down, and the part of sand grain surface is adhered to
Silicic acid gel mould swelling cracking falls off, and dispersant is fully immersed into water in sand mold, is detached with sand grains, to obtain containing remnants
The single treatment sand of silicic acid gel；The silicic acid gel can be swollen the part that cracking falls off and account for 40 ± 5wt%；
(2) the HF aqueous acids of single treatment sand low concentration are impregnated, agitation and filtration, makes the silicon for being adhered to sand grain surface remnants
Acid gel obtains after-treatment sand after eroding, heating, drying after after-treatment sand is rinsed with clear water is regenerated after sieving
Sand；
(3) it accounts for 60%-80% according to fresh sand and reclaimed sand accounts for the weight ratio mixing of 20-40%, addition dispersant is fabricated to newly
Waterglass sand mold.
2. the method that a kind of regeneration according to claim 1 recycles sodium silicate sand, characterized in that step (1) institute
The waterglass sand mold stated selects CO2Air hardening waterglass sand mold.
3. the method that a kind of regeneration according to claim 1 recycles sodium silicate sand, characterized in that step (1) institute
The dispersant stated is dispersant that is hydrophilic or being dissolved in water.
4. the method that a kind of regeneration according to claim 1 recycles sodium silicate sand, characterized in that step (2) institute
The mass concentration range 1-10% of the HF aqueous acids for the low concentration stated, time 5-20 minute of soaking and stirring.
5. the method that a kind of regeneration according to claim 1 recycles sodium silicate sand, characterized in that step (2) institute
That states is sieved through 40 mesh excessively.
6. the method that a kind of regeneration according to claim 1 recycles sodium silicate sand, characterized in that step (3) institute
The dispersant stated selects dispersant that is hydrophilic or being dissolved in water.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710610872.3A CN107282877B (en) | 2017-07-25 | 2017-07-25 | A method of regeneration recycles sodium silicate sand |
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| CN201710610872.3A CN107282877B (en) | 2017-07-25 | 2017-07-25 | A method of regeneration recycles sodium silicate sand |
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| CN107282877B true CN107282877B (en) | 2018-09-28 |
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| CN112958744A (en) * | 2021-03-01 | 2021-06-15 | 曲阜市铸造材料厂 | Preparation method for regeneration of sodium silicate sand |
| CN113579162A (en) * | 2021-08-02 | 2021-11-02 | 李景忠 | Renewable inorganic adhesive shell mold casting integrated molding process |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4303453A (en) * | 1979-06-06 | 1981-12-01 | Foundry Design Corp. | Method and apparatus for removing sand from castings |
| CN1045240A (en) * | 1990-03-22 | 1990-09-12 | 北京科学技术开发交流中心 | High pressure water jet of cleaning sand from castings method and equipment thereof |
| CN1054920A (en) * | 1990-12-26 | 1991-10-02 | 第二汽车制造厂 | Aluminium piston of IC engine composite mould casting process and automatic assembly line thereof |
| CN201470865U (en) * | 2009-09-03 | 2010-05-19 | 荆门航特有色金属铸造有限公司 | High-pressure water based sand core sand cleaning device |
| CN104399876A (en) * | 2014-11-11 | 2015-03-11 | 天津众智科技有限公司 | Method utilizing ultrasonic technology to regenerate used sodium silicate sand |
| CN104550884A (en) * | 2014-12-03 | 2015-04-29 | 贵州安吉航空精密铸造有限责任公司 | Method for removing mold shell of thin-wall casting |
| CN104588354A (en) * | 2015-01-28 | 2015-05-06 | 鹰普航空零部件（无锡）有限公司 | Hydroblasting machine |
-
2017
- 2017-07-25 CN CN201710610872.3A patent/CN107282877B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4303453A (en) * | 1979-06-06 | 1981-12-01 | Foundry Design Corp. | Method and apparatus for removing sand from castings |
| CN1045240A (en) * | 1990-03-22 | 1990-09-12 | 北京科学技术开发交流中心 | High pressure water jet of cleaning sand from castings method and equipment thereof |
| CN1054920A (en) * | 1990-12-26 | 1991-10-02 | 第二汽车制造厂 | Aluminium piston of IC engine composite mould casting process and automatic assembly line thereof |
| CN201470865U (en) * | 2009-09-03 | 2010-05-19 | 荆门航特有色金属铸造有限公司 | High-pressure water based sand core sand cleaning device |
| CN104399876A (en) * | 2014-11-11 | 2015-03-11 | 天津众智科技有限公司 | Method utilizing ultrasonic technology to regenerate used sodium silicate sand |
| CN104550884A (en) * | 2014-12-03 | 2015-04-29 | 贵州安吉航空精密铸造有限责任公司 | Method for removing mold shell of thin-wall casting |
| CN104588354A (en) * | 2015-01-28 | 2015-05-06 | 鹰普航空零部件（无锡）有限公司 | Hydroblasting machine |
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