CN108723287A - A kind of thermal regeneration method of the inorganic overlay film hygrometric state antiquated sand of silicates - Google Patents
A kind of thermal regeneration method of the inorganic overlay film hygrometric state antiquated sand of silicates Download PDFInfo
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- CN108723287A CN108723287A CN201810597043.0A CN201810597043A CN108723287A CN 108723287 A CN108723287 A CN 108723287A CN 201810597043 A CN201810597043 A CN 201810597043A CN 108723287 A CN108723287 A CN 108723287A
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- Prior art keywords
- antiquated sand
- sand
- antiquated
- overlay film
- hygrometric state
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Classifications
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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
-
- 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
- B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
-
- 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
- B22C5/06—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sieving or magnetic separating
-
- 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
- B22C5/10—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by dust separating
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
- Processing Of Solid Wastes (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention belongs to die casting core material technical fields, specifically disclose a kind of thermal regeneration method of the inorganic overlay film hygrometric state antiquated sand of silicates, include the following steps：It is sieved after antiquated sand is crushed, so that the metal in antiquated sand is cut content and be in 0.15% hereinafter, by antiquated sand dust removal of pneumatic separation, the fine powder content in antiquated sand is made to be in 5% or less；Antiquated sand is put into roaster, the size controlling of antiquated sand is less than 6 mesh, and the flow control of antiquated sand is in 20-80Kg/min；The temperature of roaster roast area is controlled at 400-500 DEG C, and antiquated sand keeps the temperature 1-2h after reaching furnace bottom, puts sand.By the processing of this thermal regeneration method, silicates antiquated sand can obtain effective regeneration reuse, solve the problems, such as that direct emission causes environmental pollution, the wasting of resources.
Description
Technical field
The invention belongs to die casting core material technical field more particularly to a kind of inorganic overlay film hygrometric state of silicates are useless
The thermal regeneration method of sand.
Background technology
Silicate derives from a wealth of sources as a kind of inorganic chemistry binder, is cheap, is non-toxic and tasteless, being widely used at present
In casting industry.Compared with organic resin binder, silicate binder is generated without toxic gas in application process, in ring
Guarantor's standard increasingly strict today, silicates molding sand are considered as the most possible molding sand type for realizing Green foundry.
But silicates molding sand there are problems that being difficult to regeneration, lead to a large amount of discharges of silicate antiquated sand, this is not
Serious pollution only is brought to environment, also results in the great wasting of resources.For the regeneration recycling there are many antiquated sand recyclings
Method, such as mechanical friction regeneration, chemical regeneration, wet reclamation and thermal reclamation, but these regeneration recovery methods are mostly
For the antiquated sand of organic resin binder, since there are prodigious differences in performance, structure with inorganic precoated sand for organic precoated sand
It is different, recycle the inorganic antiquated sand effect of silicates not using the methods of existing wet reclamation, machinery regeneration, thermal reclamation
Ideal, the antiquated sand after regeneration can not be directly re-used for casting.
Invention content
The purpose of the present invention is to provide a kind of thermal regeneration methods of the inorganic overlay film hygrometric state antiquated sand of silicates, to solve silicon
The problem of Barbiturates antiquated sand is difficult to regeneration, results in waste of resources.
In order to achieve the above object, base case of the invention is：A kind of heat of the inorganic overlay film hygrometric state antiquated sand of silicates
Regeneration method includes the following steps：It is sieved after antiquated sand is crushed, so that the metal in antiquated sand is cut content and be in 0.15% hereinafter, will
Antiquated sand dust removal of pneumatic separation makes the fine powder content in antiquated sand be in 5% or less；Antiquated sand is put into roaster, the size controlling of antiquated sand exists
Less than 6 mesh, the flow control of antiquated sand is in 20-80Kg/min；The temperature of roaster roast area is controlled at 400-500 DEG C, and antiquated sand reaches
1-2h is kept the temperature after to furnace bottom, puts sand.
The advantageous effect of this base case is：
1, the temperature of roast area is controlled at 400-500 DEG C, and by controlling the flow of antiquated sand, antiquated sand is by its table when roast area
The film temperature moment of the package in face can be heated to 300 more to 400 DEG C, but at this time antiquated sand internal temperature be also not achieved it is so high
Temperature, when antiquated sand is fallen at roaster bottom, under the action of heat is transmitted, the temperature of antiquated sand inside and outside each section at this time is left at 300 degree
The right side can effectively remove antiquated sand surface by the multiple of applicant the study found that keeping the temperature 1-2h to antiquated sand at this temperature
Film.
2, the process object of this hot recycling process method is the inorganic antiquated sand of silicates, can fully be removed by roasting
The moisture of antiquated sand skin covering of the surface allows the film on its surface to become brittleness by toughness, is conducive to remove film.
3, there are many antiquated sands of silicates, sodium oxide molybdena and silica are contained in common silicate antiquated sand, in silicate
Sodium oxide molybdena and silica have different expansion behaviors in identical temperature, be easy to fall off when being cleaned after heat expansion.Cast aluminium
Be typically the compound silicate binder that is modified by phosphate or borate with the binder used in molding sand, prepare and
At the molding sand of casting to be formed by film be actually the composite membrane that is fitted into mutually by three kinds of materials, these three materials are identical
At a temperature of also have different expansion behaviors, after roasting be easy film is removed.
4, contain a certain amount of metal aluminium skimmings in cast waste sand, by that can promote under aerobic environment after high-temperature roasting
It is oxidized into aluminium oxide or aluminate class compound into it, bulk can be formed after the accumulation of these substances, can be sieved after the later stage comes out of the stove
Divide and remove, effectively reduces the content of metal aluminium skimmings in antiquated sand.
5, using this thermal regeneration method, the regeneration of the inorganic overlay film hygrometric state antiquated sand of silicates, treatment effect are realized
Preferably, precoated sand, resin sand etc. are can be applied to, replaces fresh sand to use completely or partially.
Further, by the flow control of antiquated sand in 40-52Kg/min；The temperature of roaster roast area is controlled in 440-470
DEG C, antiquated sand keeps the temperature 1.25h after reaching furnace bottom, puts sand.Applicant has found by test of many times, and the temperature of roasting is controlled above-mentioned
In range, the effect of roasting is preferable.
Further, mechanical regeneration treatment first is carried out to antiquated sand before carrying out calcination process to antiquated sand, included the following steps：It will
Silicate antiquated sand after dust removal of pneumatic separation is milled processing, dedusting after processing of milling, and the time for processing of milling is 5-60s.
Further, dedusting of milling that treated is by the way of wet concentration dedusting.Contain a large amount of dust in antiquated sand, washing is more
Be conducive to remove the dust adhered in antiquated sand pit, keep adhesive film exposed in sand grain surface.
Further, spiral swaging machine is selected to carry out wet concentration dust removal process to antiquated sand.
Further, to also needing to carry out mechanical regeneration, water law regeneration treatment to antiquated sand after antiquated sand calcination process, specifically include with
Lower step：Antiquated sand after roasting is milled while hot, it is multistage clean, dust removal of pneumatic separation again after multistage is cleaned；Grinding time is 10-
60s, it is 3-9 grades to clean series.After antiquated sand calcination process, the film on antiquated sand surface becomes brittleness by toughness, and in silicate
Sodium oxide molybdena has different expansion behaviors from silica in identical temperature, is milled at this time to antiquated sand, cleans and be easy to make oxidation
Sodium becomes powder, silica falls off together with the film for being coated on antiquated sand surface, it is ensured that regenerates the effect of recycling.
Further, air, gassing time 10-20min are blown into while roasting.Being blown into air has following work
With first supplies oxygen for roaster, and second makes the sand in roaster boil, and reduces sand grains fall off rate, extends roasting duration, favorably
In the fully heated enough expansions of generation of surface glued membrane；Third is to blow away the fine powder on antiquated sand surface.
Further, regeneration grinding mill is selected to carry out processing of milling to antiquated sand.It is milled to antiquated sand using regeneration grinding mill
It is preferable to handle milling efficiency.
Specific implementation mode
It is further described below by specific implementation mode：
Embodiment 1
A kind of thermal regeneration method of the inorganic overlay film hygrometric state antiquated sand of silicates, includes the following steps：
(1) it is sieved after being crushed antiquated sand, so that the metal in antiquated sand is cut content and be in 0.15% hereinafter, antiquated sand selection by winnowing is removed
Dirt makes the fine powder content in antiquated sand be in 5% or less；It is milled processing to the antiquated sand after screening using regeneration grinding mill, mill place
The time of reason is 45s；Mill selects spiral swaging machine to carry out wet concentration dust removal process to antiquated sand after handling.
(2) it will be put into roaster by the antiquated sand of step (1) processing, controls the grain size of antiquated sand and the flow of addition, it will
The size controlling of antiquated sand is less than 6 mesh, by the flow control of antiquated sand in 35Kg/min；The temperature control of roaster roast area exists
450 DEG C, antiquated sand keeps the temperature 1.25h after reaching furnace bottom, puts sand；It is blown into air, gassing time 20min while roasting.
(3) it is milled at once to the antiquated sand after roasting, multistage scrub process, grinding time 50s, it is 6 to clean series
Sand after dedusting is sent into sand warehouse by grade, dust removal of pneumatic separation after multistage is cleaned.
Embodiment 2
A kind of thermal regeneration method of the inorganic overlay film hygrometric state antiquated sand of silicates, includes the following steps：
(1) it is sieved after being crushed antiquated sand, so that the metal in antiquated sand is cut content and be in 0.15% hereinafter, antiquated sand selection by winnowing is removed
Dirt makes the fine powder content in antiquated sand be in 5% or less；It is milled processing to the antiquated sand after screening using regeneration grinding mill, mill place
The time of reason is 20s；Mill selects spiral swaging machine to carry out wet concentration dust removal process to antiquated sand after handling.
(2) it will be put into roaster by the antiquated sand of step (1) processing, controls the grain size of antiquated sand and the flow of addition, it will
The size controlling of antiquated sand is less than 6 mesh, by the flow control of antiquated sand in 50Kg/min；The temperature control of roaster roast area exists
480 DEG C, antiquated sand keeps the temperature 1.4h after reaching furnace bottom, puts sand；It is blown into air, gassing time 20min while roasting.
(3) it is milled at once to the antiquated sand after roasting, multistage scrub process, grinding time 40s, it is 5 to clean series
Sand after dedusting is sent into sand warehouse by grade, dust removal of pneumatic separation after multistage is cleaned.
Embodiment 3
A kind of thermal regeneration method of the inorganic overlay film hygrometric state antiquated sand of silicates, includes the following steps：
(1) it is sieved after being crushed antiquated sand, so that the metal in antiquated sand is cut content and be in 0.15% hereinafter, antiquated sand selection by winnowing is removed
Dirt makes the fine powder content in antiquated sand be in 5% or less；It is milled processing to the antiquated sand after screening using regeneration grinding mill, mill place
The time of reason is 60s；Mill selects spiral swaging machine to carry out wet concentration dust removal process to antiquated sand after handling.
(2) it will be put into roaster by the antiquated sand of step (1) processing, controls the grain size of antiquated sand and the flow of addition, it will
The size controlling of antiquated sand is less than 6 mesh, by the flow control of antiquated sand in 38Kg/min；The temperature control of roaster roast area exists
430 DEG C, antiquated sand keeps the temperature 1.8h after reaching furnace bottom, puts sand；It is blown into air, gassing time 18min while roasting.
(3) it is milled at once to the antiquated sand after roasting, multistage scrub process, grinding time 55s, it is 5 to clean series
Sand after dedusting is sent into sand warehouse by grade, dust removal of pneumatic separation after multistage is cleaned.
Respectively to through embodiment 1-3 treated reclaimed sands and without the inorganic overlay film of silicates of any working process
The sour consumption value of sand hygrometric state antiquated sand, clay content, pH value are detected, and obtain table 1：
Table 1
Analytical conclusions：
According to the data of table 1 it is found that the inorganic precoated sand hygrometric state of silicates handled by the present patent application technical solution
Antiquated sand, sour consumption value, clay content, pH value are useless well below the inorganic precoated sand hygrometric state of silicates without any working process
Sand can meet the use standard after the inorganic precoated sand hygrometric state antiquated sand regeneration of silicates, can put into and reuse, effectively reduce
Cost.
Claims (8)
1. a kind of thermal regeneration method of the inorganic overlay film hygrometric state antiquated sand of silicates, it is characterised in that：Include the following steps：By antiquated sand
It is sieved after broken, so that the metal in antiquated sand is cut content and be in 0.15% hereinafter, by antiquated sand dust removal of pneumatic separation, the fine powder in antiquated sand is made to contain
Amount is in 5% or less；Antiquated sand is put into roaster, the size controlling of antiquated sand is less than 6 mesh, and the flow control of antiquated sand is in 20-
80Kg/min；The temperature of roaster roast area is controlled at 400-500 DEG C, and antiquated sand keeps the temperature 1-2h after reaching furnace bottom, puts sand.
2. a kind of thermal regeneration method of the inorganic overlay film hygrometric state antiquated sand of silicates according to claim 1, it is characterised in that：
By the flow control of antiquated sand in 40-52Kg/min；The temperature of roaster roast area is controlled at 440-470 DEG C, and antiquated sand reaches furnace bottom
After keep the temperature 1.25h, put sand.
3. a kind of thermal regeneration method of the inorganic overlay film hygrometric state antiquated sand of silicates according to claim 1 or 2, feature exist
In：Mechanical regeneration treatment first is carried out to antiquated sand before carrying out calcination process to antiquated sand, is included the following steps：After dust removal of pneumatic separation
Silicate antiquated sand is milled processing, dedusting after processing of milling, and the time for processing of milling is 5-60s.
4. a kind of thermal regeneration method of the inorganic overlay film hygrometric state antiquated sand of silicates according to claim 3, it is characterised in that：
Dedusting of milling that treated is by the way of wet concentration dedusting.
5. a kind of thermal regeneration method of the inorganic overlay film hygrometric state antiquated sand of silicates according to claim 4, it is characterised in that：
Spiral swaging machine is selected to carry out wet concentration dust removal process to antiquated sand.
6. a kind of thermal regeneration method of the inorganic overlay film hygrometric state antiquated sand of silicates according to claim 3, it is characterised in that：
To also needing to carry out mechanical regeneration, water law regeneration treatment to antiquated sand after antiquated sand calcination process, following steps are specifically included：After roasting
Antiquated sand milled while hot, it is multistage clean, dust removal of pneumatic separation again after multistage is cleaned；Grinding time is 10-60s, cleans series and is
3-9 grades.
7. a kind of thermal regeneration method of the inorganic overlay film hygrometric state antiquated sand of silicates according to claim 3, it is characterised in that：
It is blown into air, gassing time 10-20min while roasting.
8. a kind of thermal regeneration method of the inorganic overlay film hygrometric state antiquated sand of silicates according to claim 3, it is characterised in that：
Regeneration grinding mill is selected to carry out processing of milling to antiquated sand.
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| CN201810597043.0A CN108723287B (en) | 2018-06-11 | 2018-06-11 | Thermal regeneration method of silicate inorganic coating wet waste sand |
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| CN201810597043.0A CN108723287B (en) | 2018-06-11 | 2018-06-11 | Thermal regeneration method of silicate inorganic coating wet waste sand |
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| CN108723287B CN108723287B (en) | 2020-01-07 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109226668A (en) * | 2018-11-21 | 2019-01-18 | 合肥仁创铸造材料有限公司 | A kind of inorganic sand regeneration method |
| CN109396328A (en) * | 2018-12-17 | 2019-03-01 | 合肥仁创铸造材料有限公司 | A kind of combining and regenerating technique and the inorganic reclaimed sand of inorganic old sand thermal method and wet process |
| CN109822041A (en) * | 2019-03-27 | 2019-05-31 | 烟台通鼎舟汽车零部件有限公司 | A kind of inorganic antiquated sand regeneration method |
| CN112077260A (en) * | 2020-09-08 | 2020-12-15 | 重庆长江造型材料常州有限公司 | Acid consumption value controllable green sand regeneration and recycling process |
| CN112846070A (en) * | 2020-12-28 | 2021-05-28 | 亚威机械制造(徐州)有限公司 | Precoated sand recycling and regenerating process and equipment |
| CN115846588A (en) * | 2022-11-17 | 2023-03-28 | 柳晶科技集团股份有限公司 | Regeneration method of casting inorganic waste sand and regenerated sand |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109226668A (en) * | 2018-11-21 | 2019-01-18 | 合肥仁创铸造材料有限公司 | A kind of inorganic sand regeneration method |
| CN109396328A (en) * | 2018-12-17 | 2019-03-01 | 合肥仁创铸造材料有限公司 | A kind of combining and regenerating technique and the inorganic reclaimed sand of inorganic old sand thermal method and wet process |
| CN109822041A (en) * | 2019-03-27 | 2019-05-31 | 烟台通鼎舟汽车零部件有限公司 | A kind of inorganic antiquated sand regeneration method |
| CN112077260A (en) * | 2020-09-08 | 2020-12-15 | 重庆长江造型材料常州有限公司 | Acid consumption value controllable green sand regeneration and recycling process |
| CN112846070A (en) * | 2020-12-28 | 2021-05-28 | 亚威机械制造(徐州)有限公司 | Precoated sand recycling and regenerating process and equipment |
| CN112846070B (en) * | 2020-12-28 | 2022-09-23 | 亚威科技(文昌)有限公司 | Precoated sand recycling and regenerating process and equipment |
| CN115846588A (en) * | 2022-11-17 | 2023-03-28 | 柳晶科技集团股份有限公司 | Regeneration method of casting inorganic waste sand and regenerated sand |
| CN115846588B (en) * | 2022-11-17 | 2024-01-12 | 柳晶科技集团股份有限公司 | Regeneration method of foundry inorganic waste sand and regenerated sand |
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