CN109465378A - The technique for discarding shell preparation casting employment pelletizing shape ceramic sand using model casting - Google Patents
The technique for discarding shell preparation casting employment pelletizing shape ceramic sand using model casting Download PDFInfo
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- CN109465378A CN109465378A CN201910052627.4A CN201910052627A CN109465378A CN 109465378 A CN109465378 A CN 109465378A CN 201910052627 A CN201910052627 A CN 201910052627A CN 109465378 A CN109465378 A CN 109465378A
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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
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
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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
-
- 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
- B22C5/0409—Blending, mixing, kneading or stirring; Methods therefor
-
- 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
Abstract
The present invention relates to casting ceramic sand field, specially a kind of technique for discarding shell preparation casting employment pelletizing shape ceramic sand using model casting.Shell classification first is discarded to model casting according to surface layer, backing layer sand, to powder size < 0.1mm after being crushed using jaw crusher, double-roll crusher, ceramic sand raw material are used as after powder magnetic separation is removed iron particle, binder, fluxing additive ball milling 4h~8h is added, after rolling comminution granulation granulation, it is placed in the sintering of rotary kiln high temperature, kiln discharge natural cooling；Sintering process parameter is as follows: 1300~1500 DEG C of sintering temperature, 2~5h of sintering time.Present invention can apply to improve casting quality in large-scale steel-casting, stainless steel part, precoated sand, model casting, 3D printing molding sand, production cost is reduced.Shell is discarded in the regeneration of high-efficient energy-saving environment friendly, prepares the casting employment pelletizing shape ceramic sand of high added value.
Description
Technical field
It is specially a kind of to discard shell preparation casting employment using model casting the present invention relates to casting ceramic sand field
The technique of pelletizing shape ceramic sand.
Background technique
Model casting industry is every according to the knowledge of the applicant generates 1 ton of casting for 1~1.5 ton of antiquated sand of generation, it is contemplated that 2021 years essences
Close casting annual output is up to 4,600,000 tons, therefore will generate 400~6,000,000 tons of discarded shell.
The developed countries such as beauty, day, Europe begin to the recycling that shell is discarded in concern hot investment casting earlier than eighties of last century,
By its regeneration be prepared as refractory product (such as: sprue cup, molding running channel), Japan propose " no matter from environmental protection and reduce at
This angle considers that the waste treatment and regeneration of ceramic shell are extremely important, and the establishment of policy measure is for hot investment casting
Development be the task of top priority ".As big country in foundry, the discarded shell produced every year should not be underestimated in China, now discarded shell warp
Regeneration treatment for glass, cement, sand material for building, refractory brick building brick, repair the roads or the production of filler and aglite
In.Such as: Waste Sodium Silicate is crushed, magnetic separation, screens different sieves by the patent document of Publication No. CN 102806307A
Net particle is directly used as floor sand or the method that bauxite is used as facing sand is added.Another example is: publication number CN 104150924A's is special
Sharp document, model casting legacy shell returns insulating and heating riser is covered and preparation method thereof.
Artificial spherical ceramic sand is applied to earliest in petroleum fracturing propping agent industry, such as: Publication No. CN
The patent document of 103525395A prepares haydite oil gas fracturing propping agents and preparation method thereof using solid waste ceramsite sand, with solid
Discarded ceramsite sand, bauxite, MnO2It is raw material, solid waste ceramsite sand, bauxite, MnO with dolomite2With the weight percent of dolomite
Ceramsite sand is prepared than being respectively as follows: 15~25%, 70~80%, 1~3% and 2~4%, later Shandong Buddha's warrior attendant new material share has
The production of limit company produces ceramic sand by raw material of flint clay.
" a kind of spinel foundry sand and its preparation that Chinese patent literature (publication number CN 104557062A) is announced
Method ", the artificial spherical ceramic sand which is related to is aluminum-spinel matter, and composition of raw material proportion is 72.9%Al2O3With
98%MgO adds binder and fires according to mass ratio 2.6:1, but its refractoriness is low, and sintering temperature is high, consumes the energy
And Spherical Sand surface quality cannot improve, there are still certain problems on granulation, sintering process for artificial spherical ceramic sand.
Artificial spherical ceramic sand grains shape rounding, surface is smooth, can reduce the additional amount of resin, reduces gas-forming property, and heat is swollen
Bulk is small to can be avoided such as silica sand at 573 DEG C there are β → α phase transformation, and volume expansion amount causes greatly casting to be deformed, arteries and veins
The defects of line, scab.
Model casting disclosed in above-mentioned patent discards shell recoverying and utilizing method and artificial Spherical Sand raw material, system
Standby process discards the preparation that shell is used to cast employment pelletizing shape ceramic sand without reference to recycling model casting
In.It is applicant's understanding that the shell after being fired and being poured has high-temperature flame-proof object phase, belong to excellent refractory material suitable for people
The preparation of pelletizing shape ceramic sand, it is available ideal by adjusting the preparation process and composition proportion of artificial spherical ceramic sand
Phase structure, refractoriness and size distribution, as large-scale steel-casting, stainless steel part, precoated sand, 3D printing sand and model casting
Ideal Modeling Material.
Summary of the invention
Shell preparation casting employment pelletizing shape ceramic sand is discarded using model casting the object of the present invention is to provide a kind of
Technique makes full use of model casting to discard such excellent fireproof raw material of shell, solves discarded shell and abandons, fills pollution environment
Status, and prepare the artificial spherical ceramic sand of high-performance novel as raw material and promote casting quality.
In order to achieve the object of the present invention, the technical solution adopted is that:
A kind of technique for discarding shell preparation casting employment pelletizing shape ceramic sand using model casting, first according to surface layer, back
Layer sand discards shell classification to model casting, will to powder size < 0.1mm after being crushed using jaw crusher, double-roll crusher
Powder magnetic separation is used as ceramic sand raw material after removing iron particle, binder, fluxing additive ball milling 4h~8h is added, using rolling
After comminution granulation is granulated, it is placed in the sintering of rotary kiln high temperature, kiln discharge natural cooling；Sintering process parameter is as follows: sintering temperature 1300
~1500 DEG C, 2~5h of sintering time.
The technique that shell preparation casting employment pelletizing shape ceramic sand is discarded using model casting, model casting is given up
Shell screening, broken, magnetic separation, corase grinding are abandoned, making full use of model casting to discard the above ingredient of shell 90wt% is refractory material
Feature prepares the artificial spherical ceramic sand of high-performance, the powder particle size D after ball milling90≤13μm。
The technique that shell preparation casting employment pelletizing shape ceramic sand is discarded using model casting, raw material are
Al2O3-SiO2Series or Al2O3-SiO2-ZrO2Serial refractory material.
The technique that shell preparation casting employment pelletizing shape ceramic sand is discarded using model casting, artificial spherical ceramic
Sand is mullite-corundum-cristobalite compound phase or mullite-cristobalite-zircon compound phase.
The technique that shell preparation casting employment pelletizing shape ceramic sand is discarded using model casting, discards shell through jaw
Formula crusher is crushed to partial size < 3mm, is placed in double-roll crusher and is crushed to partial size < 0.1mm.
The technique that shell preparation casting employment pelletizing shape ceramic sand is discarded using model casting, binder is swelling
Soil, additional amount account for 3~5wt%.
The technique that shell preparation casting employment pelletizing shape ceramic sand is discarded using model casting, fluxing additive are
The one or two of MnO, nickel tailing, the additional amount of MnO account for 2~5wt%, and the additional amount of nickel tailing accounts for 10~15wt%.
The technique for discarding shell preparation casting employment pelletizing shape ceramic sand using model casting, it is preferred that sintering
Technological parameter is as follows: 1350~1400 DEG C of sintering temperature, sintering time 2h.
Design philosophy of the invention is:
The present invention first discards shell classification to model casting according to surface layer, backing layer sand, broken using jaw crusher, double roller
To powder size < 0.1mm after crusher machine, ceramic sand raw material are used as after magnetic separation.Be added binder, additive ball milling 4h~8h,
Granulation, sintering obtain the artificial spherical ceramic sand of high-performance, include > 1700 DEG C of refractoriness, low thermal expansion, highly heatproof and shockproof and stablize
Property etc..To can be applied to large-scale steel-casting, stainless steel part, precoated sand, model casting, improve casting matter in 3D printing molding sand
Amount reduces production cost.Shell is discarded in the regeneration of high-efficient energy-saving environment friendly, prepares the casting employment pelletizing shape of high added value
Ceramic sand.
Compared with prior art, the invention has the following advantages and beneficial effects:
1, raw material sources discard shell in model casting, are able to solve now discarded shell and arbitrarily fill, utilize added value
Low problem, the main component of shell waste material are Al2O3~SiO2Series, Al2O3-SiO2-ZrO2Serial refractory material.In shell
Fused white corundum sand, zircon sand, have very high refractoriness, good thermal stability.And it is shortage of resources, expensive.
4% manganese oxide is added into raw material as sintering aid to be modified ceramic sand surface, more than single component ceramic sand surface
Add smooth, more fine and close, no through-hole can be reduced the additional amount of resin.This foundry sand has excellent performance, is cheap, can be extensive
Applied to Modeling Material.
2, for ceramic sand refractoriness prepared by the present invention up to 1800 DEG C, heat-resistant knocking stability is excellent, has high temeperature chemistry steady
It is qualitative.Sintering temperature is lower than 1500 DEG C, and linear expansivity is small, and bulk density is 1.4~1.6g/cm3, thermal coefficient at 1000 DEG C
It is 0.52~0.74.
Specific embodiment
In the following, being further elaborated on by embodiment to the present invention.
Embodiment 1:
In this example, the raw material of selection are that fused white corundum-gangue discards shell, and shell facing sand is white just using electric smelting
Jade, floor sand select gangue, and slurry selects fused white corundum slurry and bauxite slurry, binder are silica solution.Shell material
The chemical component weight percentage of material is as follows: Al2O3: 41.6%, SiO2: 54.3%, MgO:2.11%, CaO:0.61%,
TiO2: 0.7%, Fe2O3: 0.68%.The main chemical compositions weight percent of nickel tailing is as follows: Al2O3: 3.86%, SiO2:
48.74%, MgO:25.39%, CaO:4.04%, Fe2O3: 6.59%, Ni:0.87%.
The specific preparation process of the artificial spherical ceramic sand, comprising the following steps:
(1) shell pre-processes: sorting model casting discards shell, after being crushed to partial size < 3mm using jaw crusher
It is crushed to partial size < 0.1mm in double-roll crusher, powder magnetic separation is removed into iron particle.Powder is placed in wet-milling 8h in ball grinder,
As the raw material for preparing artificial spherical ceramic sand；
(2) ingredient, powder processed: be added in shell powder obtained in (1) 5wt% bentonite, 2wt% manganese oxide,
Shell powder, bentonite, manganese oxide, nickel tailing 81:5:2:12 by weight are added in ball mill by the nickel tailing of 12wt%,
Water is added.By weight, ball: water: material=1.5:1:1 dry grinding 1h, powder particle size D90≤13μm。
(3) it is granulated: being granulated using rolling method, powder is added in circle pot pelletizer, circle pot revolving speed is adjusted to 34r/
Min forms particle using the droplet wrapping agglomeration of atomization, when 60wt% or more green-ball partial size reaches 109 μm or so, stops adding
Water simultaneously takes out after rolling 5min, obtains ceramic sand green-ball ball embryo.Total amount of water is the 16wt% of ceramic sand green-ball ball embryo total weight,
Granulation time is 1h；
(4) it dries: qualified ceramic sand green-ball ball embryo being placed in drying box and is dried, it is dry to constant weight, drying temperature
It is 150 DEG C, drying time 1h；
(5) it sieves: resulting ceramic sand green-ball ball embryo will be granulated cross 40~140 mesh screens and sieve, and obtain partial size model
Enclose 350~109 μm；
(6) it is sintered: the ceramic sand green-ball ball embryo after drying being placed in rotary kiln and is sintered, sintering temperature 1350
DEG C, sintering time 2h is then cooled to room temperature；
Measuring in this example can be such as by artificial spherical ceramic grittiness made from raw material of fused white corundum-gangue shell
Under:
The performance indicator of 1 product of the present invention of table
Embodiment 2:
In this example, the raw material of selection are that zircon-gangue discards shell, and shell facing sand uses vitreous silica, back
Sand selects gangue, and slurry selects gangue slurry, and binder is silica solution.The chemical component weight percentage of type shell material is such as
Under: Al2O3: 18.4%, SiO2: 50.3%, ZrO2: 24.6%, MgO:1.5%, CaO:2.7%, TiO2: 0.2%, Fe2O3:
1.6%, Na2O:0.3%, K2O:0.4%.
The specific preparation process of the artificial spherical ceramic sand, comprising the following steps:
(1) shell pre-processes: sorting model casting discards shell, after being crushed to partial size < 3mm using jaw crusher
Partial size < 0.1mm is crushed in double-roll crusher, powder magnetic separation is removed into iron particle.The wet-milling 4h in ball grinder, as preparation
The raw material of artificial spherical ceramic sand；
(2) ingredient, powder processed: 3wt% bentonite, 2wt% manganese oxide is added in shell powder obtained in (1), by type
Shell powder, bentonite, manganese oxide are added in ball mill by weight 95:3:2, and water is added.By weight, ball: water: material=
1.5:1.2:1 dry grind 1h, powder particle size D90≤13μm；
(3) it is granulated: being granulated using rolling method, powder is added in circle pot pelletizer, circle pot revolving speed is adjusted to 40r/
Min forms particle using the droplet wrapping agglomeration of atomization, when 60wt% or more green-ball partial size reaches 109 μm or so, stops adding
Water simultaneously takes out after rolling 5min, obtains ceramic sand green-ball ball embryo.Total amount of water is the 15wt% of ceramic sand green-ball ball embryo total weight,
Granulation time is 1h；
(4) it dries: qualified ceramic sand green-ball ball embryo being placed in drying box and is dried, it is dry to constant weight, drying temperature
It is 150 DEG C, drying time 1h；
(5) it sieves: resulting ceramic sand green-ball ball embryo will be granulated cross 40~140 mesh screens and sieve, and obtain partial size model
Enclose 350~109 μm；
(6) it is sintered: the ceramic sand green-ball ball embryo after drying being placed in rotary kiln and is sintered, sintering temperature 1300
DEG C, sintering time 1h is then cooled to room temperature；
Measuring in this example can be such as by artificial spherical ceramic grittiness made from raw material of vitreous silica-gangue shell
Under:
The performance indicator of 2 product of the present invention of table
Embodiment 3:
In this example, the raw material of selection are that fused white corundum-mullite discards shell, and shell facing sand is white just using electric smelting
Jade, floor sand select mullite, and slurry selects mullite slurry, and binder is silica solution.The chemical component weight hundred of type shell material
Divide ratio as follows: Al2O3: 66.2%, SiO2: 30.5%, MgO:1.2%, CaO:0.3%, TiO2: 0.6%, Fe2O3: 0.8%,
Na2O:0.3%, K2O:0.1%.
The specific preparation process of the artificial spherical ceramic sand, comprising the following steps:
(1) shell pre-processes: sorting model casting discards shell, after being crushed to partial size < 3mm using jaw crusher
Partial size < 0.1mm is crushed in double-roll crusher, powder magnetic separation is removed into iron particle.The wet-milling 8h in ball grinder, as preparation
The raw material of artificial spherical ceramic sand；
(2) ingredient, powder processed: 5wt% bentonite, 5wt% manganese oxide is added in shell powder obtained in (1), by type
Shell powder, bentonite, manganese oxide are added in ball mill by weight 90:5:5, and water is added.By weight, ball: water: material=
1.6:1.1:1 dry grind 2h, powder particle size D90≤13μm；
(3) it is granulated: being granulated using rolling method, powder is added in circle pot pelletizer, circle pot revolving speed is adjusted to 36r/
Min forms particle using the droplet wrapping agglomeration of atomization, when 60wt% or more green-ball partial size reaches 109 μm or so, stops adding
Water simultaneously takes out after rolling 5min, obtains ceramic sand green-ball ball embryo.Total amount of water is the 17wt% of ceramic sand green-ball ball embryo total weight,
Granulation time is 1h；
(4) it dries: qualified ceramic sand green-ball ball embryo being placed in drying box and is dried, it is dry to constant weight, drying temperature
It is 150 DEG C, drying time 1h；
(5) it sieves: resulting ceramic sand green-ball ball embryo will be granulated cross 40~140 mesh screens and sieve, and obtain partial size model
Enclose 350~109 μm；
(6) it is sintered: the ceramic sand green-ball ball embryo after drying being placed in rotary kiln and is sintered, sintering temperature 1450
DEG C, sintering time 1h is then cooled to room temperature；
Measuring in this example can be such as by artificial spherical ceramic grittiness made from raw material of fused white corundum-mullite shell
Under:
The performance indicator of 3 product of the present invention of table
Embodiment 4:
In this example, the raw material of selection are that zircon-mullite discards shell, and shell facing sand uses zircon, floor sand
Mullite is selected, slurry selects zircon slurry, and binder is silica solution.The chemical component weight percentage of type shell material is such as
Under: Al2O3: 49.3%, SiO2: 24.8%, ZrO2: 22.68, MgO:1.07%, CaO:0.82%, TiO2: 0.15%, Fe2O3:
0.7%, Na2O:0.2%, K2O:0.28%.
The specific preparation process of the artificial spherical ceramic sand, comprising the following steps:
(1) shell pre-processes: sorting model casting discards shell, after being crushed to partial size < 3mm using jaw crusher
Partial size < 0.1mm is crushed in double-roll crusher, powder magnetic separation is removed into iron particle.The wet-milling 6h in ball grinder, as preparation
The raw material of artificial spherical ceramic sand；
(2) ingredient, powder processed: 5wt% bentonite, 4wt% manganese oxide is added in shell powder obtained in (1), by type
Shell powder, bentonite, manganese oxide are added in ball mill by weight 91:5:4, and water is added.By weight, ball: water: material=
1.5:1:1 dry grind 1h, powder particle size D90≤13μm；
(3) it is granulated: being granulated using rolling method, powder is added in circle pot pelletizer, circle pot revolving speed is adjusted to 34r/
Min forms particle using the droplet wrapping agglomeration of atomization, when 60wt% or more green-ball partial size reaches 109 μm or so, stops adding
Water simultaneously takes out after rolling 3min, obtains ceramic sand green-ball ball embryo.Total amount of water is the 17wt% of ceramic sand green-ball ball embryo total weight,
Granulation time is 1h；
(4) it dries: qualified ceramic sand green-ball ball embryo being placed in drying box and is dried, it is dry to constant weight, drying temperature
It is 150 DEG C, drying time 1h；
(5) it sieves: resulting ceramic sand green-ball ball embryo will be granulated cross 40~140 mesh screens and sieve, and obtain partial size model
Enclose 350~109 μm；
(6) it is sintered: the ceramic sand green-ball ball embryo after drying being placed in rotary kiln and is sintered, sintering temperature 1400
DEG C, sintering time 1.5h is then cooled to room temperature；
Measuring in this example can be as follows by artificial spherical ceramic grittiness made from raw material of zirconium English powder-mullite shell:
The performance indicator of 4 product of the present invention of table
Embodiment the result shows that, the present invention discards after shell broken, magnetic separation, corase grinding as ceramic sand former material model casting
Material then obtains having 1700 DEG C or more refractoriness, low linear expansions by addition binder, additive ball milling, granulation, sintering
Property, highly heatproof and shockproof stability etc. the artificial spherical ceramic sand of high-performance, can be used for steel-casting, ironcasting and the casting of other non-ferrous alloys
The Modeling Material of part production.Solve the problems, such as moltening mold castings discard shell arbitrarily fill, recycle added value low, reduction for
The harm of environment is conducive to the development of Green foundry.
Claims (8)
1. a kind of technique for discarding shell preparation casting employment pelletizing shape ceramic sand using model casting, characterized in that first foundation
Surface layer, backing layer sand discard shell classification to model casting, using jaw crusher, double-roll crusher it is broken after to powder size <
0.1mm is used as ceramic sand raw material after powder magnetic separation is removed iron particle, binder, fluxing additive ball milling 4h~8h is added,
After rolling comminution granulation granulation, it is placed in the sintering of rotary kiln high temperature, kiln discharge natural cooling；Sintering process parameter is as follows: sintering
1300~1500 DEG C of temperature, 2~5h of sintering time.
2. the technique described in accordance with the claim 1 that shell preparation casting employment pelletizing shape ceramic sand is discarded using model casting,
It is characterized in that model casting is discarded shell screening, broken, magnetic separation, corase grinding, model casting is made full use of to discard shell 90wt%
The above ingredient is the feature of refractory material, prepares the artificial spherical ceramic sand of high-performance, the powder particle size D after ball milling90≤13μm。
3. the technique described in accordance with the claim 1 that shell preparation casting employment pelletizing shape ceramic sand is discarded using model casting,
It is characterized in that raw material Al2O3-SiO2Series or Al2O3-SiO2-ZrO2Serial refractory material.
4. the technique described in accordance with the claim 1 that shell preparation casting employment pelletizing shape ceramic sand is discarded using model casting,
It is characterized in that artificial spherical ceramic sand is that mullite-corundum-cristobalite compound phase or mullite-cristobalite-zircon are multiple
Close object phase.
5. the technique described in accordance with the claim 1 that shell preparation casting employment pelletizing shape ceramic sand is discarded using model casting,
It is characterized in that discarded shell is crushed to partial size < 3mm through jaw crusher, it is placed in double-roll crusher and is crushed to partial size < 0.1mm.
6. the technique described in accordance with the claim 1 that shell preparation casting employment pelletizing shape ceramic sand is discarded using model casting,
It is characterized in that binder is bentonite, additional amount accounts for 3~5wt%.
7. the technique described in accordance with the claim 1 that shell preparation casting employment pelletizing shape ceramic sand is discarded using model casting,
It is characterized in that fluxing additive is the one or two of MnO, nickel tailing, the additional amount of MnO accounts for 2~5wt%, and nickel tailing adds
Enter amount and accounts for 10~15wt%.
8. the technique described in accordance with the claim 1 that shell preparation casting employment pelletizing shape ceramic sand is discarded using model casting,
It is characterized in that, it is preferred that sintering process parameter is as follows: 1350~1400 DEG C of sintering temperature, sintering time 2h.
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| CN110156481A (en) * | 2019-04-08 | 2019-08-23 | 启东市聚旺铸造有限公司 | Utilize the refractory material of model casting antiquated sand preparation and the preparation method of refractory material |
| CN110156442A (en) * | 2019-04-08 | 2019-08-23 | 启东市聚旺铸造有限公司 | Use the light-weight refractory aggregate and preparation method thereof of model casting antiquated sand |
| CN110284040A (en) * | 2019-07-25 | 2019-09-27 | 范兴宽 | A kind of preparation process of high-performance and low-cost long-life aluminum chromium cylinder sleeve |
| CN110698213A (en) * | 2019-11-19 | 2020-01-17 | 新沂北美高科耐火材料有限公司 | Preparation method of fused quartz refractory material for precision casting shell |
| CN112126778A (en) * | 2020-05-14 | 2020-12-25 | 中冶长天国际工程有限责任公司 | Iron ore direct reduction metallurgy method based on 3D printing |
| CN114101577A (en) * | 2021-11-24 | 2022-03-01 | 北京仁创砂业铸造材料有限公司 | Regeneration method of casting 3D printing waste sand |
| CN114309453A (en) * | 2021-12-10 | 2022-04-12 | 东华大学 | Additive for casting sand capable of reducing casting air hole defects |
| CN114570874A (en) * | 2022-02-28 | 2022-06-03 | 无锡锡南铸造机械股份有限公司 | Artificial sand manufacturing process, artificial sand recycling process and magnetic artificial sand |
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| CN112126778A (en) * | 2020-05-14 | 2020-12-25 | 中冶长天国际工程有限责任公司 | Iron ore direct reduction metallurgy method based on 3D printing |
| CN114101577A (en) * | 2021-11-24 | 2022-03-01 | 北京仁创砂业铸造材料有限公司 | Regeneration method of casting 3D printing waste sand |
| CN114101577B (en) * | 2021-11-24 | 2023-12-29 | 北京仁创砂业铸造材料有限公司 | Regeneration method of casting 3D printing waste sand |
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| CN114570874B (en) * | 2022-02-28 | 2024-01-05 | 无锡锡南铸造机械股份有限公司 | Artificial sand manufacturing process, artificial sand recycling process and magnetic artificial sand |
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