CN108453246A - A kind of cast steel insulated feeder coverture and preparation method thereof - Google Patents
A kind of cast steel insulated feeder coverture and preparation method thereof Download PDFInfo
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- CN108453246A CN108453246A CN201810462769.3A CN201810462769A CN108453246A CN 108453246 A CN108453246 A CN 108453246A CN 201810462769 A CN201810462769 A CN 201810462769A CN 108453246 A CN108453246 A CN 108453246A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
- B22D27/06—Heating the top discard of ingots
Abstract
The present invention relates to a kind of cast steel insulated feeder covertures and preparation method thereof, belong to foundary industry technical field.The present invention can be the characteristics of the surface of material forms one layer of colloid film using the phosphate of colloidal state, when compound material and phosphate are blended, colloid film is just equably wrapped on the surface of composite material, form light porous or reticular structure, in this configuration, tissue with dispersing cellular hole between skeleton, mutually it is point contact, significantly reduce heat transfer area, improve thermal resistance value, improve heat insulation effect, simultaneously, the air being coated in multiple hole is a kind of good insulating body again, to reach heat insulating function, the molten metal in riser is set to be in molten condition during feeding, to ensure to obtain good feeding effect；The present invention improves the refractoriness of forsterite, is detached with molten steel conducive to field trash, reduce strand dreg defect, substantially increase product quality by introducing zirconium material in forsterite sintering procedure.
Description
Technical field
The present invention relates to a kind of cast steel insulated feeder covertures and preparation method thereof, belong to foundary industry technical field.
Background technology
Casting is the manufacture most flexible method of complex parts, and the application of advanced foundry engieering brings new to process industry
While vigor, foundry industry is also made to encounter from the inside and outside huge challenge of casting industry.In the casting process of cast steel
In, the cooling velocity of molten steel in riser can be slowed down using Steel Casting Risers coverture, improve feeding energy of the riser molten steel to steel-casting
Power improves the quality and yield rate of steel-casting to reduce molten steel dosage.
The effect of Steel Casting Risers coverture is it will be apparent that when Steel Casting Risers coverture is added in riser in casting process
When on molten steel face, molten slag layer, sinter layer, transition zone and slag layer are formed on molten steel face rapidly, completely cuts off riser molten steel and air
Contact, prevent convection current and radiant heat transfer, reduce heat transfer, cause riser molten steel to have slower setting rate, with casting
Solidification, the continuous feeding of riser molten steel, Steel Casting Risers coverture constantly sinks, to ensure that Steel Casting Risers cover on riser molten steel face
Dosage form plays the effect that heat preservation is adiabatic well at stable stratiform.So Steel Casting Risers coverture is covered with continuous casting Steel Casting Risers
The effect of lid agent is substantially similar, and main function is as follows：（1）The molten steel adiabatic heat-insulation exposed to top prevents from radiating, and improves riser
Feeding capacity；（2）Aggregation, dissolving float to the non-metallic inclusion in molten steel face from molten steel, purify molten steel；（3）Isolation is empty
Gas prevents the oxygen in air from entering molten steel and secondary oxidation occurs.These good performances of Steel Casting Risers coverture and its chemical group
At between, the selection of raw material, raw material combination and the factors such as proportioning it is related.That is, good physics and chemically
Matter, rational coverage property and layer structure are a kind of two conditions that good Steel Casting Risers coverture is indispensable.
From the point of view of the development trend and present situation of continuous casting cast steel covering flux, the chemical composition of Steel Casting Risers coverture has
The feature that ultrahigh basicity, high-vitrification develop.The kind of Steel Casting Risers coverture more seriation, to adapt to different steel grades, no
With the cast of technological parameter, the related physical property of Steel Casting Risers coverture may be used various empirical equations and be calculated, casting
Steel covering flux formula designs the road for also gradually going on standardization.It is worth noting that the important of Steel Casting Risers coverture
Effect, does not cause enough attention also so far in the engineers and technicians that some are engaged in casting.So must be casting cast steel
Covering flux development and production are established on the basis of science, the Steel Casting Risers coverture series of oneself are developed, to meet
China casts the needs of career development.
Invention content
The technical problems to be solved by the invention：Undesirable, the feeding for the heat-insulating property of existing Steel Casting Risers coverture
Ability and spreadability are poor, and heat insulation effect is not very stable problem, provide a kind of cast steel insulated feeder coverture and its system
Preparation Method.
In order to solve the above technical problems, the technical solution adopted by the present invention is：
A kind of cast steel insulated feeder coverture, including following weight parts raw material composition：200~300 parts of expanded perlites, 80~
100 parts of flue dusts, 80~100 parts of diatomite, 600~800 parts of bauxites, 200~400 parts of refractory aggregates, 400~500 parts of phosphorus
Hydrochlorate binder, 200~300 parts of exothermic materials, 15~30 parts of calcium-silicon powder.
The refractory aggregate is forsterite sand, anthracite, light-burning magnesium powder, mass fraction are 1% sulfurous acid solution, zirconium English
Stone, bauxite keep the temperature calcining after ball milling drying, then are ground up, sieved, and obtain refractory aggregate.
In the refractory aggregate parts by weight of each raw material be 400~480 parts of forsterite sands, 300~360 parts of anthracites,
120~150 parts of light-burning magnesium powders, 15~25 parts of sulfurous acid solutions, 20~30 parts of zircons, 100~120 parts of bauxites.
The heat preservation calcination process is under nitrogen atmosphere, to be heated to 1500~1600 DEG C of 3~4h of heat preservation calcining.
The phosphate binders are that phosphoric acid is mixed and heated to 80~90 DEG C with deionized water, add aluminium hydroxide, oxygen
Change zinc, magnesia reaction is added after being persistently heated with stirring to 90~100 DEG C and is made.
Described weight of material part be 400~560 parts of phosphoric acid, 160~200 parts of deionized waters, 70~80 parts of aluminium hydroxides, 50
~60 parts of zinc oxide, 16~24 parts of magnesia.
The exothermic material is made of following weight parts raw material：120~150 parts of aluminium powders, 60~80 parts of brown iron oxides, 10~
20 parts of manganese dioxide, 200~300 parts of expansible graphites.
The calcium-silicon powder contains Ca27%~32%, Si56%~60%.
A kind of preparation method of cast steel insulated feeder coverture, the specific steps are：
（1）Forsterite sand, anthracite, light-burning magnesium powder is taken to be fitted into 1~2h of ball milling in ball mill, it is 1% sub- to add mass fraction
Sulfuric acid solution, zircon, bauxite continue the compound material that discharges to obtain after ball milling 1~2h；
（2）Be fitted into Muffle furnace after compound material is dried, under nitrogen atmosphere, be heated to 1500~1600 DEG C heat preservation calcining 3~
4h is ground after cooling, is crossed 200 mesh sieve, is obtained refractory aggregate；
（3）It takes phosphoric acid to be mixed and heated to 80~90 DEG C with deionized water, adds aluminium hydroxide, zinc oxide, continue agitating and heating
Magnesia is added after to 90~100 DEG C, continues stirring and insulation reaction 20~30min, it is cold go to room temperature after discharge, obtain phosphate
Binder；
（4）It takes aluminium powder, brown iron oxide, manganese dioxide, expansible graphite to be fitted into 2~3h of ball milling in ball mill, obtains exothermic material；
（5）Take expanded perlite, flue dust, diatomite, bauxite, refractory aggregate, phosphate binders, exothermic material, silico-calcium
Alloyed powder is fitted into 3~5min of stirring in spice bucket, then is placed in 200~220 DEG C of drying ovens, toasts 2~3h, is cooled to room temperature
Discharging encapsulation afterwards, obtains cast steel insulated feeder coverture.
Compared with other methods, advantageous effects are the present invention：
（1）The present invention can be the characteristics of the surface of material forms one layer of colloid film, compound using the phosphate of colloidal state
When material is blended with phosphate, colloid film is just equably wrapped on the surface of composite material, is formed light porous or netted
Structure, in this configuration, the tissue with dispersing cellular hole, is mutually point contact, hence it is evident that reduce heat transfer between skeleton
Area improves thermal resistance value, improves heat insulation effect, meanwhile, the air being coated in multiple hole is a kind of good insulating body again,
To reach heat insulating function, the molten metal in riser is made to be in molten condition during feeding, to ensure to obtain good benefit
Contracting effect；
（2）The present invention allows High-temperature-reszirconium zirconium oxide other materials packet by introducing zirconium material in forsterite sintering procedure
Cover, forsterite surface wrap up one layer of zirconium oxide layer, to improve the refractoriness of forsterite, improve its thermal stability,
Anti-oxidant, anti-erosion, thermal shock resistance so that magnesia to form a fixed number with the field trash in molten steel under molten steel high temperature action
The liquid phase film of amount is filled between solid particle, to form certain thickness sinter layer, is prevented the infiltration of molten steel, is prevented simultaneously
Carbonaceous material enters, and pollutes molten steel, and the magnalium powder combination calcium-silicon powder restored, as reducing agent, enhancing coverture absorbs
The ability of the FeS and FeO at molten steel interface reduce S, O content in molten steel and nascent solidified shell, collect the nonmetal inclusion in molten steel
Object detaches conducive to field trash with molten steel, reduces strand dreg defect, substantially increases product quality.
Specific implementation mode
400~480g forsterite sands, 300~360g anthracites, 120~150g light-burning magnesium powders is taken to be fitted into ball in ball mill
Grind 1~2h, add 15~25g mass fractions be 1% sulfurous acid solution, 20~30g zircons, 100~120g bauxites, after
Discharge to obtain compound material after 1~2h of continuous ball milling, and compound material is placed in baking oven, is dried at 110~120 DEG C to constant weight, dry knot
Desciccate is fitted into Muffle furnace after beam, under nitrogen atmosphere, 1500~1600 DEG C of heat preservation 3~4h of calcining are heated to, with stove
It is transferred in grinder and grinds after being cooled to room temperature, cross 200 mesh sieve, obtain refractory aggregate, take 400~560g phosphoric acid and 160~200mL
Deionized water mixes, and stirs 20~30min with 300~400r/min under 80~90 DEG C of waters bath with thermostatic control, adds 70~80g hydrogen
Aluminium oxide, 50~60g zinc oxide are heated to 90~100 DEG C after persistently stirring 20~30min, add 16~24g magnesia,
Continue stirring and insulation reaction 20~30min, it is cold go to room temperature after discharge, obtain phosphate binders, take 120~150g aluminium powders,
60~80g brown iron oxides, 10~20g manganese dioxide, 200~300g expansible graphites are fitted into 2~3h of ball milling in ball mill, obtain
Exothermic material, takes 200~300g expanded perlites, 80~100g flue dusts, 80~100g diatomite, 600~800g bauxites,
200~400g refractory aggregates, 400~500g phosphate binders, 200~300g exothermic materials, 15~30g calcium-silicon powder,
It is fitted into 3~5min of stirring in spice bucket, then is placed in 200~220 DEG C of drying ovens, 2~3h is toasted, discharge envelope after being cooled to room temperature
Dress, obtains cast steel insulated feeder coverture.
Example 1
It takes 400g forsterite sands, 300g anthracites, 120g light-burning magnesium powders to be fitted into ball milling 1h in ball mill, adds 15g mass
Score is 1% sulfurous acid solution, 20g zircons, 100g bauxites, continues the compound material that discharges to obtain after ball milling 1h, compound material is placed in
In baking oven, dries to constant weight at 110 DEG C, desciccate is fitted into Muffle furnace after drying, under nitrogen atmosphere, heating
To 1500 DEG C of heat preservation calcining 3h, cools to the furnace after room temperature to be transferred in grinder and grind, cross 200 mesh sieve, obtain refractory aggregate, take
400g phosphoric acid is mixed with 160mL deionized waters, is stirred 20min with 300r/min under 80 DEG C of waters bath with thermostatic control, is added 70g hydrogen-oxygens
Change aluminium, 50g zinc oxide is heated to 90 DEG C after persistently stirring 20min, adds 16g magnesia, continues stirring and insulation reaction
20min, it is cold go to room temperature after discharge, obtain phosphate binders, take 120g aluminium powders, 60g brown iron oxides, 10g manganese dioxide, 200g
Expansible graphite is fitted into ball milling 2h in ball mill, obtains exothermic material, takes 200g expanded perlites, 80g flue dusts, 80g diatoms
Soil, 600g bauxites, 200g refractory aggregates, 400g phosphate binders, 200g exothermic materials, 15g calcium-silicon powder, loading are mixed
3min is stirred in charging basket, then is placed in 200 DEG C of drying ovens, 2h is toasted, and discharge encapsulation after being cooled to room temperature, and obtains cast steel insulated feeder
Coverture.
Example 2
It takes 440g forsterite sands, 330g anthracites, 135g light-burning magnesium powders to be fitted into ball milling 1h in ball mill, adds 20g mass
Score is 1% sulfurous acid solution, 25g zircons, 110g bauxites, continues the compound material that discharges to obtain after ball milling 1h, compound material is placed in
In baking oven, dries to constant weight at 115 DEG C, desciccate is fitted into Muffle furnace after drying, under nitrogen atmosphere, heating
To 1550 DEG C of heat preservation calcining 3h, cools to the furnace after room temperature to be transferred in grinder and grind, cross 200 mesh sieve, obtain refractory aggregate, take
480g phosphoric acid is mixed with 180mL deionized waters, is stirred 25min with 350r/min under 85 DEG C of waters bath with thermostatic control, is added 75g hydrogen-oxygens
Change aluminium, 55g zinc oxide is heated to 95 DEG C after persistently stirring 25min, adds 20g magnesia, continues stirring and insulation reaction
25min, it is cold go to room temperature after discharge, obtain phosphate binders, take 135g aluminium powders, 70g brown iron oxides, 15g manganese dioxide, 250g
Expansible graphite is fitted into ball milling 2h in ball mill, obtains exothermic material, takes 250g expanded perlites, 90g flue dusts, 90g diatoms
Soil, 700g bauxites, 300g refractory aggregates, 450g phosphate binders, 250g exothermic materials, 28g calcium-silicon powder, loading are mixed
4min is stirred in charging basket, then is placed in 210 DEG C of drying ovens, 2h is toasted, and discharge encapsulation after being cooled to room temperature, and obtains cast steel insulated feeder
Coverture.
Example 3
It takes 480g forsterite sands, 360g anthracites, 150g light-burning magnesium powders to be fitted into ball milling 2h in ball mill, adds 25g mass
Score is 1% sulfurous acid solution, 30g zircons, 120g bauxites, continues the compound material that discharges to obtain after ball milling 2h, compound material is placed in
In baking oven, dries to constant weight at 120 DEG C, desciccate is fitted into Muffle furnace after drying, under nitrogen atmosphere, heating
To 1600 DEG C of heat preservation calcining 4h, cools to the furnace after room temperature to be transferred in grinder and grind, cross 200 mesh sieve, obtain refractory aggregate, take
560g phosphoric acid is mixed with 200mL deionized waters, is stirred 30min with 400r/min under 90 DEG C of waters bath with thermostatic control, is added 80g hydrogen-oxygens
Change aluminium, 60g zinc oxide is heated to 100 DEG C after persistently stirring 30min, adds 24g magnesia, continues stirring and insulation reaction
30min, it is cold go to room temperature after discharge, obtain phosphate binders, take 150g aluminium powders, 80g brown iron oxides, 20g manganese dioxide, 300g
Expansible graphite is fitted into ball milling 3h in ball mill, obtains exothermic material, takes 300g expanded perlites, 100g flue dusts, 100g diatoms
Soil, 800g bauxites, 400g refractory aggregates, 500g phosphate binders, 300g exothermic materials, 30g calcium-silicon powder, loading are mixed
5min is stirred in charging basket, then is placed in 220 DEG C of drying ovens, 3h is toasted, and discharge encapsulation after being cooled to room temperature, and obtains cast steel insulated feeder
Coverture.
Reference examples：The cast steel insulated feeder coverture of Liaoning company production.
The cast steel insulated feeder coverture of example and reference examples is detected, specific detection is as follows：
The measurement of thermal coefficient：The thermal coefficient of ball wall conductometer measurement coverture is selected in experiment.
Fusion temperature is tested：Using the molten fast analyzer of RDS-05 fully automatic slag fusing points.
Influence experiment of the expanded graphite content to expansion character：（1）It weighs the coverture that 4 parts of quality are 16g and is put into crucible
In, number is respectively 1,2,3,4, be added 0 thereto respectively, 1%, 2%, 3%, acidifying graphite, it is for use after mixing.（2）It will heating
Stove is warming up to 800 DEG C, constant temperature 2h, opens bell, is then put into 1 in the soaking plate in stove rapidly, blowing out after 30min waits covering
After lid agent cooling, coverture is collected in crucible, its volume is measured with graduated cylinder.（3）It repeats the above steps, measures respectively remaining
The dilatancy of 3 kinds of covertures.
Specific testing result such as table 1.
1 performance characterization contrast table of table
As shown in Table 1, the cast steel insulated feeder coverture that prepared by the present invention have good dilatancy and spreadability, it is good every
The fusion temperature of hot heat-insulating property, coverture is also at suitable level.
Claims (9)
1. a kind of cast steel insulated feeder coverture, which is characterized in that formed including following weight parts raw material：200~300 parts of expansions
Perlite, 80~100 parts of flue dusts, 80~100 parts of diatomite, 600~800 parts of bauxites, 200~400 parts of refractory aggregates,
400~500 parts of phosphate binders, 200~300 parts of exothermic materials, 15~30 parts of calcium-silicon powder.
2. a kind of cast steel insulated feeder coverture as described in claim 1, which is characterized in that the refractory aggregate is magnesium olive
Stone sand, anthracite, light-burning magnesium powder, mass fraction are 1% sulfurous acid solution, zircon, bauxite, and calcining is kept the temperature after ball milling drying,
It is ground up, sieved again, obtains refractory aggregate.
3. a kind of cast steel insulated feeder coverture as claimed in claim 2, which is characterized in that each raw material in the refractory aggregate
Parts by weight be 400~480 parts of forsterite sands, 300~360 parts of anthracites, 120~150 parts of light-burning magnesium powders, 15~25 parts of Asias
Sulfuric acid solution, 20~30 parts of zircons, 100~120 parts of bauxites.
4. a kind of cast steel insulated feeder coverture as claimed in claim 2, which is characterized in that the heat preservation calcination process for
Under nitrogen atmosphere, it is heated to 1500~1600 DEG C of 3~4h of heat preservation calcining.
5. a kind of cast steel insulated feeder coverture as described in claim 1, which is characterized in that the phosphate binders are phosphorus
Acid is mixed and heated to 80~90 DEG C with deionized water, adds aluminium hydroxide, zinc oxide, is persistently heated with stirring to 90~100 DEG C
Magnesia reaction is added afterwards to be made.
6. a kind of cast steel insulated feeder coverture as claimed in claim 5, which is characterized in that described weight of material part is 400
~560 parts of phosphoric acid, 160~200 parts of deionized waters, 70~80 parts of aluminium hydroxides, 50~60 parts of zinc oxide, 16~24 parts of oxidations
Magnesium.
7. a kind of cast steel insulated feeder coverture as described in claim 1, which is characterized in that the exothermic material is by following heavy
Measure part raw material composition：120~150 parts of aluminium powders, 60~80 parts of brown iron oxides, 10~20 parts of manganese dioxide, 200~300 parts can be swollen
Swollen graphite.
8. a kind of cast steel insulated feeder coverture as described in claim 1, which is characterized in that the calcium-silicon powder contains
Ca27%~32%, Si56%~60%.
9. a kind of preparation method of cast steel insulated feeder coverture as described in claim 1~8 any one, feature exist
In, the specific steps are：
（1）Forsterite sand, anthracite, light-burning magnesium powder is taken to be fitted into 1~2h of ball milling in ball mill, it is 1% sub- to add mass fraction
Sulfuric acid solution, zircon, bauxite continue the compound material that discharges to obtain after ball milling 1~2h；
（2）Be fitted into Muffle furnace after compound material is dried, under nitrogen atmosphere, be heated to 1500~1600 DEG C heat preservation calcining 3~
4h is ground after cooling, is crossed 200 mesh sieve, is obtained refractory aggregate；
（3）It takes phosphoric acid to be mixed and heated to 80~90 DEG C with deionized water, adds aluminium hydroxide, zinc oxide, continue agitating and heating
Magnesia is added after to 90~100 DEG C, continues stirring and insulation reaction 20~30min, it is cold go to room temperature after discharge, obtain phosphate
Binder；
（4）It takes aluminium powder, brown iron oxide, manganese dioxide, expansible graphite to be fitted into 2~3h of ball milling in ball mill, obtains exothermic material；
（5）Take expanded perlite, flue dust, diatomite, bauxite, refractory aggregate, phosphate binders, exothermic material, silico-calcium
Alloyed powder is fitted into 3~5min of stirring in spice bucket, then is placed in 200~220 DEG C of drying ovens, toasts 2~3h, is cooled to room temperature
Discharging encapsulation afterwards, obtains cast steel insulated feeder coverture.
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| CN110029204A (en) * | 2019-04-04 | 2019-07-19 | 本钢板材股份有限公司 | Ladle heat insulation, molten steel deoxygenation method after a kind of refining |
| CN110394429A (en) * | 2019-08-19 | 2019-11-01 | 郑州东升冶金新材料有限公司 | A kind of riser head heat-preserving coverture and preparation method thereof |
| CN110842148A (en) * | 2019-12-17 | 2020-02-28 | 和县华顺铸造有限公司 | Preparation method of heating and heat-insulating riser sleeve for casting |
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| CN113732273A (en) * | 2021-09-10 | 2021-12-03 | 东营嘉扬精密金属有限公司 | Environment-friendly riser heat-insulating agent and preparation method thereof |
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| CN110029204A (en) * | 2019-04-04 | 2019-07-19 | 本钢板材股份有限公司 | Ladle heat insulation, molten steel deoxygenation method after a kind of refining |
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| CN111673049A (en) * | 2020-05-29 | 2020-09-18 | 浙江佳虹新材料科技有限公司 | Fiber heat-insulating riser material for casting |
| CN115612788A (en) * | 2021-07-13 | 2023-01-17 | 郑州富斯鼎新材料有限公司 | Slag remover for steel casting and preparation method thereof |
| CN113732273A (en) * | 2021-09-10 | 2021-12-03 | 东营嘉扬精密金属有限公司 | Environment-friendly riser heat-insulating agent and preparation method thereof |
| CN113732273B (en) * | 2021-09-10 | 2022-12-06 | 东营嘉扬精密金属有限公司 | Environment-friendly riser heat-insulating agent and preparation method thereof |
| CN115286403A (en) * | 2022-07-14 | 2022-11-04 | 中铸新材工业（江苏）有限公司 | Heated self-flowing quick repair dry powder and preparation method thereof |
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Application publication date: 20180828 |