CN110385424A - A kind of stuffing sand filling sand method for being conducive to improve IF steel cleanness - Google Patents
A kind of stuffing sand filling sand method for being conducive to improve IF steel cleanness Download PDFInfo
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- CN110385424A CN110385424A CN201910811201.2A CN201910811201A CN110385424A CN 110385424 A CN110385424 A CN 110385424A CN 201910811201 A CN201910811201 A CN 201910811201A CN 110385424 A CN110385424 A CN 110385424A
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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
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/14—Closures
- B22D41/44—Consumable closure means, i.e. closure means being used only once
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Abstract
The invention discloses a kind of stuffing sands for being conducive to improve IF steel cleanness to fill sand method, is related to purification of molten steel technical field.The stuffing sand for being conducive to improve IF steel cleanness fills sand structure, including bottom of steel ladle brick, the bottom of the bottom of steel ladle brick are provided with containment wall, and the bottom of the containment wall is provided with ladle upper slide, is provided with ladle lower skateboard below the ladle upper slide.The stuffing sand for being conducive to improve IF steel cleanness fills sand method, after the completion of ladle automatic casting process, ladle draining sand flows into tundish together with molten steel, it is largely stayed in the form of slag in the slag of tundish top after being moved in impact zone, so that the oxidisability of slag improves, oxygen gesture is increased in slag is positively correlated with the oxygen gesture in molten steel, therefore chromium matter stuffing sand enters the oxygen content also resulted in molten steel after the slag of top and increases, and the increase of oxygen content represents the increase that oxide is mingled in tundish molten steel.
Description
Technical field
The present invention relates to purification of molten steel technical field, specially a kind of stuffing sand for being conducive to improve IF steel cleanness fills sand
Method.
Background technique
IF steel, full name Interstitial-Free Steel, i.e. gapless atomic steel have extremely excellent deep drawability,
It is widely used in the industries such as automobile, household electrical appliances.In recent years, as market competition is aggravated, steel users propose the cleanliness of IF steel
More and more harsh requirement.In order to constantly promote the cleanliness of IF steel, steel mill, which does not stint, puts into vast resources, not to smelting process
It is disconnected to optimize, but a large amount of process optimization measure is mainly for control endogenous inclusion, and the control of foreign impurity is arranged
It applies extremely limited.Foreign impurity includes clinker, refractory material etc..These foreign impurity stock sizes are bigger, to product
The influence of quality is very severe.
Ladle draining sand is the packing material at the bottom of steel ladle mouth of a river, is one of important sources of foreign impurity.Stuffing sand
The mechanism of action be: molten steel inject ladle initial stage, mouth of a river upper surface stuffing sand contact molten steel after be sintered rapidly and hinder
The infiltration of molten steel, sinter layer are able to bear under the support of lower part stuffing sand the static pressure of molten steel without destroying；Simultaneously
The sintering velocity of stuffing sand is slack-off, and sinter layer maintains certain thickness.And the unsintered stuffing sand of lower part when pouring is opened because certainly
Recast falls, and sinter layer loses support, and sinter layer is caused to be crushed under the gravity of molten steel, and realization, which is opened, pours.From the foregoing, it will be observed that
When ladle is opened and poured, when slide plate is opened, a large amount of stuffing sands can drop into tundish because of molten steel pressure.Due to stuffing sand size
It is larger, if cannot remove in time, it is possible to the Large Inclusions in steel are formed, to generate bad shadow to Cleanliness of Molten Steel
It rings.
The automatic casting of stuffing sand is the important indicator of stuffing sand self performance, if can not achieve automatic casting, needs
It to be drained using oxygen mode is burnt, easy to operate by mistake to burn out slide plate and lead to secondary oxidation of steel, such as burning oxygen is ineffective, even
Continuous casting line is caused to be forced phenomena such as interrupting.
Since chromium matter stuffing sand fusing point is 1730~1750 DEG C, can be sintered at a lower temperature, it is possible to prevente effectively from steel
Packet stuffing sand floating when molten steel is added, which enters molten steel in filling pipe end, leads to be unable to automatic casting, and ladle is higher from rate is drawn,
Generally higher than 98%, domestic mainstream steel mill produces stuffing sand used in IF steel and uses chromium matter stuffing sand.
Chinese patent (application publication number: 107651968 A of CN) disclose " a kind of refined steel ladles chromium matter stuffing sand and
Preparation method ", the invention propose a kind of refined steel ladles chromium matter stuffing sand and preparation method thereof, mainly will be as steel-making
The titanium calcium aluminate part of industrial residue replaces chrome ore as raw material, significantly reduces manufacturing cost, solves and draw
Quicksand automatic casting self-opening rate is low, high production cost, environment influence big problem.But the patent does not refer to it to Cleanliness of Molten Steel
Influence.
Chinese patent (application publication number: 106244761 A of CN) discloses a kind of " preparation side of high-cleanness, high IF steel
Method ", the invention by pair: 1) converter carbon content, the lower quantity of slag；2) LF stove heating system；3) molten steel depth decarburizer, molten steel is added in RH
Inclusion removal agent；4) continuous casting working procedure improves IF steel cleanness using measures such as calcium aluminate system tundish covering fluxs.The invention
Preparation method is easy to operate, at low cost, improves Cleanliness of Molten Steel by process modification, but does not refer to packet pair in stuffing sand entrance
The influence that Cleanliness of Molten Steel generates.
Technical paper " stuffing sand: the important sources of steel Large Inclusions " (the 11st China Steel nd Annual Meeting
Collection --- S02. steel-making and continuous casting): conclude that many Large Inclusions in 1) steel are not by thin in steel by research
Small field trash collision is grown up and is formed；2) it may infer that part Large Inclusions are stuffing sand and its sintered product；3) when drawing
After quicksand enters molten steel, it is very difficult for completely removing in tundish.When ladle is opened and poured, drainage should be removed as far as possible
Sand.But the paper does not propose targetedly control measure.
Summary of the invention
(1) the technical issues of solving
In view of the deficiencies of the prior art, the present invention provides a kind of stuffing sands for being conducive to improve IF steel cleanness to fill sand side
Method solves the problems, such as that generating foreign impurity after wrapping in stuffing sand entrance causes Cleanliness of Molten Steel to deteriorate.
(2) technical solution
In order to achieve the above object, the present invention is achieved by the following technical programs: one kind is conducive to improve the cleaning of IF steel
The stuffing sand of degree fills sand structure, including bottom of steel ladle brick, the bottom of the bottom of steel ladle brick are provided with containment wall, the bottom of the containment wall
Portion is provided with ladle upper slide, and ladle lower skateboard is provided with below the ladle upper slide, and the containment wall top is provided with water
Mouthful brick cup layer is provided with the rim of a bowl on the pocket block layer, is provided with ladle upper nozzle below described the rim of a bowl, on the ladle
It is provided with molten steel channel in the mouth of a river, high alumina stuffing sand, the mouth of a river are provided in the lower part of described the rim of a bowl and molten steel channel
Set up separately on brick cup and positioned at the rim of a bowl top and brick cup top stuffing sand protrusion and be equipped with chromium matter stuffing sand, the brick cup top is drawn
It is stuffing sand sinter layer on part that quicksand, which protrudes,.
It is a kind of be conducive to improve IF steel cleanness stuffing sand fill sand method, including it is above-mentioned be conducive to improve IF steel cleanness
Stuffing sand fill sand structure, the specific steps are as follows:
S1, selection stuffing sand type are simultaneously provided with the stuffing sand filling sand structure for being conducive to improve IF steel cleanness；
S2, ladle draining sand dosage is determined, concrete operations are as follows:
A) 4 dosage of high alumina stuffing sand with " 4 research on maximum utilized quantity MAX of ladle nozzle difference service stage high alumina stuffing sand (A1, A2,
A3, A4, A5, A6) " it is used as benchmark, it may be assumed that 4 dosages of high alumina stuffing sand=MAX (A1, A2, A3, A4, A5, A6)；
B) 9 dosage of chromium matter stuffing sand with " 9 research on maximum utilized quantity MAX of ladle nozzle difference service stage chromium matter stuffing sand (B1, B2,
B3, B4, B5, B6) " it is used as benchmark, it may be assumed that 9 dosages of chromium matter stuffing sand=MAX (B1, B2, B3, B4, B5, B6)；
C) single bag of stuffing sand weight is determined:
Single bag of 4 weight of high alumina stuffing sand=MAX (A1, A2, A3, A4, A5, A6) ÷ 2；
Single bag of 9 weight of chromium matter stuffing sand=MAX (B1, B2, B3, B4, B5, B6) ÷ 2；
D) single bag of stuffing sand weight is determined:
Single bag of high alumina stuffing sand weight=MAX (A1, A2, A3, A4, A5, A6) ÷ 2；
Single bag of chromium matter stuffing sand weight=MAX (B1, B2, B3, B4, B5, B6) ÷ 2；
S3, the preparation before filling sand is carried out, concrete operations are as follows:
Under ladle horizontality, with coaloust-oxygen gun burning wash ladle upper nozzle channel and bowl portion region, it is ensured that ladle upper nozzle and
Pocket block layer tumbles ladle to packet mouth apart from 60 ° -80 ° of vertical line without residue, residual steel, and stops 3-5 minutes, it is ensured that nothing
Ladle is tumbled to steel ladle opening upward again after shoddye outflow；
S4, fill sand: steel ladle opening under state, is initially charged with two bags of high alumina stuffing sands by filling sand rifle upward, rear to be packed into two bags
Chromium matter stuffing sand.
Preferably, in step sl, select the concrete mode of stuffing sand type as follows:
1) molten steel channel part: filling high alumina stuffing sand；
2) the rim of a bowl part: high alumina stuffing sand is filled in lower part about 1/2, and chromium matter stuffing sand is filled on top about 1/2；
3) brick cup top stuffing sand protrudes part: filling chromium matter stuffing sand.
Preferably, the high alumina stuffing sand, the chemical composition of chromium matter stuffing sand are as follows:
High alumina stuffing sand 4:Al2O3>=65.0%, SiO2≤ 25.0%, Fe2O3≤ 4.5%, H2O≤0.5%, granularity
(0.15-1mm) >=90%；
Chromium matter stuffing sand 9:Cr2O3>=30.0%, SiO2≤ 35.0%, Fe2O3>=10%, H2O≤0.5%, granularity
(0.15-1mm) >=90%.
(3) beneficial effect
The present invention provides a kind of stuffing sands for being conducive to improve IF steel cleanness to fill sand method.Have following beneficial to effect
Fruit: the stuffing sand for being conducive to improve IF steel cleanness fills sand method, after the completion of ladle automatic casting process, ladle draining sand
As molten steel flows into tundish together, largely stayed in the form of slag in the slag of tundish top after being moved in impact zone.
Since the oxygen content of chromium matter stuffing sand is higher, the oxidisability for inevitably resulting in slag is improved, can according to physical chemistry thermodynamical equilibrium
Know: the raising of oxygen gesture also results in molten steel after entering top slag with the oxygen gesture positive correlation in molten steel, therefore chromium matter stuffing sand in slag
Oxygen content increases, and the increase of oxygen content represents the increase that oxide is mingled in tundish molten steel, that is, molten steel cleanness
It reduces.Hypoxic high alumina stuffing sand part is substituted hyperoxic chromium matter stuffing sand by the present invention, reduces chromium matter drainage
The dosage of sand, so that the Cleanliness of Molten Steel of IF steel is improved, meanwhile, it improves ladle and draws rate certainly.
Detailed description of the invention
Fig. 1 is the schematic diagram for being conducive to improve the stuffing sand filling sand structure of IF steel cleanness；
Fig. 2 is ladle nozzle access times, high alumina stuffing sand and chromium matter stuffing sand dosage relation schematic diagram.
In figure: 1, stuffing sand sinter layer；2, bottom of steel ladle brick；3, the rim of a bowl；4, high alumina stuffing sand；5, molten steel channel；6, steel
Wrap slide plate；7, ladle lower skateboard；8, brick cup top stuffing sand protrudes part；9, chromium matter stuffing sand；10, pocket block layer；11,
Containment wall；12, ladle upper nozzle.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The present invention provides a kind of technical solution referring to FIG. 1-2: a kind of stuffing sand filling for being conducive to improve IF steel cleanness
Sand structure, including bottom of steel ladle brick 2, the bottom of bottom of steel ladle brick 2 are provided with containment wall 11, and the bottom of containment wall 11 is provided on ladle
Slide plate 6, the lower section of ladle upper slide 6 are provided with ladle lower skateboard 7, and 11 top of containment wall is provided with pocket block layer 10, mouth of a river seat
The rim of a bowl 3 is provided in brick layer 10, the lower section of the rim of a bowl 3 is provided with ladle upper nozzle 12, and it is logical that molten steel is provided in ladle upper nozzle 12
Road 5, is provided with high alumina stuffing sand 4 in the lower part of the rim of a bowl 3 and molten steel channel 5, on pocket block 10 and is located at 3 top of the rim of a bowl
And brick cup top stuffing sand protrusion part 8 is provided with chromium matter stuffing sand 9, brick cup top stuffing sand protrudes on part 8 for drainage
Sand sinter layer 1.
It is a kind of be conducive to improve IF steel cleanness stuffing sand fill sand method, including it is above-mentioned be conducive to improve IF steel cleanness
Stuffing sand fill sand structure, the specific steps are as follows:
S1, selection stuffing sand type are simultaneously provided with the stuffing sand filling sand structure for being conducive to improve IF steel cleanness, wherein selecting
The concrete mode of stuffing sand type is as follows:
1) 5 part of molten steel channel: filling high alumina stuffing sand 4；
2) 3 part of the rim of a bowl: high alumina stuffing sand 4 is filled in lower part about 1/2, and chromium matter stuffing sand 9 is filled on top about 1/2；
3) brick cup top stuffing sand protrudes part 8: filling chromium matter stuffing sand 9；
High alumina stuffing sand 4, the chemical composition of chromium matter stuffing sand 9 are as follows:
High alumina stuffing sand 4:Al2O3>=65.0%, SiO2≤ 25.0%, Fe2O3≤ 4.5%, H2O≤0.5%, granularity
(0.15-1mm) >=90%；
Chromium matter stuffing sand 9:Cr2O3>=30.0%, SiO2≤ 35.0%, Fe2O3>=10%, H2O≤0.5%, granularity
(0.15-1mm) >=90%；
S2, ladle draining sand dosage is determined, concrete operations are as follows:
A) determine that the different type stuffing sand dosage of ladle nozzle different service stages, stuffing sand dosage will ensure to fill steel
Aquaporin (5), the rim of a bowl (3) part, and brick cup top stuffing sand is protruded into part (8) height control within the scope of 50-60mm；
B) 4 dosage of high alumina stuffing sand with " 4 research on maximum utilized quantity MAX of ladle nozzle difference service stage high alumina stuffing sand (A1, A2,
A3, A4, A5, A6) " it is used as benchmark, it may be assumed that 4 dosages of high alumina stuffing sand=MAX (A1, A2, A3, A4, A5, A6), institute as shown in Figure 1, Figure 2
Show.
C) 9 dosage of chromium matter stuffing sand with " 9 research on maximum utilized quantity MAX of ladle nozzle difference service stage chromium matter stuffing sand (B1, B2,
B3, B4, B5, B6) " it is used as benchmark, it may be assumed that 9 dosages of chromium matter stuffing sand=MAX (B1, B2, B3, B4, B5, B6), institute as shown in Figure 1, Figure 2
Show；
D) single bag of stuffing sand weight is determined:
Single bag of 4 weight of high alumina stuffing sand=MAX (A1, A2, A3, A4, A5, A6) ÷ 2；
Single bag of 9 weight of chromium matter stuffing sand=MAX (B1, B2, B3, B4, B5, B6) ÷ 2；
S3, the preparation before filling sand is carried out, concrete operations are as follows:
Under ladle horizontality, 3 region of 12 channel of ladle upper nozzle and bowl portion is washed with coaloust-oxygen gun burning, it is ensured that ladle upper nozzle
12 and pocket block layer 10 ladle is tumbled to packet mouth apart from 60 ° -80 ° of vertical line without residue, residual steel, and stop 3-5 minutes,
Ladle is tumbled to steel ladle opening upward again after ensuring no shoddye outflow；
S4, fill sand: steel ladle opening under state, is initially charged with two bags of high alumina stuffing sands 4 by filling sand rifle upward, rear to be packed into two bags
Chromium matter stuffing sand 9.
The invention has the benefit that
(1) after IF steel ladle fills the sand technique application present invention, middle packet total oxygen average out to 22ppm is relatively all drawn using chromium matter
The quicksand technique 25ppm that is averaged reduces 3ppm；Continuous casting billet total oxygen average out to 13ppm is relatively all flat using chromium matter stuffing sand technique
Equal 15ppm reduces 2ppm；
(2) after IF steel ladle fills the sand technique application present invention, ladle is from rate average out to 99.6% is drawn, relatively all using chromium matter
Stuffing sand technique average 98.5% improves 1.1%；
(3) after IF steel ladle fills the sand technique application present invention, each ladle is drawn using high alumina stuffing sand 15kg, chromium matter respectively
Quicksand 25kg, relatively all using chromium matter stuffing sand technique chromium matter stuffing sand dosage 90kg, cost has significant decrease.Using the present invention
Afterwards, each ladle uses high alumina stuffing sand 15kg (1980 yuan/ton), chromium matter stuffing sand 25kg (2778 yuan/ton), molten steel amount 300
Ton, ton steel stuffing sand cost are 0.33 yuan/ton of steel；All using chromium matter stuffing sand technique, each ladle uses chromium matter stuffing sand
90kg (2778 yuan/ton), ton steel stuffing sand cost are 0.83 yuan/ton of steel.To produce per year in terms of 2,000,000 tons of IF steel, year economic benefit be
1000000 yuan.
In conclusion the stuffing sand for being conducive to improve IF steel cleanness fills sand method, it is complete in ladle automatic casting process
Cheng Hou, ladle draining sand flow into tundish together with molten steel, are largely stayed in the form of slag after moving in impact zone
In the slag of tundish top.Since the oxygen content of chromium matter stuffing sand is higher, the oxidisability for inevitably resulting in slag is improved, according to physico
It learns known to thermodynamical equilibrium: after oxygen gesture is increased in slag is positively correlated with the oxygen gesture in molten steel, therefore chromium matter stuffing sand enters top slag
The oxygen content that will lead in molten steel increases, and the increase of oxygen content represents the increase that oxide is mingled in tundish molten steel, also
It is the reduction of molten steel cleanness.Hypoxic high alumina stuffing sand part is substituted hyperoxic chromium matter stuffing sand by the present invention,
Reduce the dosage of chromium matter stuffing sand, so that the Cleanliness of Molten Steel of IF steel is improved, meanwhile, it improves ladle and draws rate certainly.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (4)
1. a kind of stuffing sand for being conducive to improve IF steel cleanness fills sand structure, it is characterised in that: including bottom of steel ladle brick (2),
The bottom of the bottom of steel ladle brick (2) is provided with containment wall (11), and the bottom of the containment wall (11) is provided with ladle upper slide (6),
It is provided with ladle lower skateboard (7) below the ladle upper slide (6), containment wall (11) top is provided with pocket block layer
(10), it is provided with the rim of a bowl (3) on the pocket block layer (10), is provided with ladle upper nozzle (12) below the rim of a bowl (3),
It is provided with molten steel channel (5) in the ladle upper nozzle (12), is all provided in the lower part of the rim of a bowl (3) and molten steel channel (5)
It is equipped with high alumina stuffing sand (4), on the pocket block (10) and is located at the rim of a bowl (3) top and brick cup top stuffing sand protrusion
Divide (8) to be provided with chromium matter stuffing sand (9), is on brick cup top stuffing sand protrusion part (8) stuffing sand sinter layer (1).
2. a kind of stuffing sand for being conducive to improve IF steel cleanness fills sand method, it is characterised in that: be conducive to improve including above-mentioned
The stuffing sand of IF steel cleanness fills sand structure, the specific steps are as follows:
S1, selection stuffing sand type are simultaneously provided with the stuffing sand filling sand structure for being conducive to improve IF steel cleanness；
S2, ladle draining sand dosage is determined, concrete operations are as follows:
A) determine that the different type stuffing sand dosage of ladle nozzle different service stages, stuffing sand dosage will ensure to fill molten steel logical
Road (5), the rim of a bowl (3) part, and brick cup top stuffing sand is protruded into part (8) height control within the scope of 50-60mm；
B) high alumina stuffing sand (4) dosage with " ladle nozzle difference service stage high alumina stuffing sand (4) research on maximum utilized quantity MAX (A1, A2,
A3, A4, A5, A6) " it is used as benchmark, it may be assumed that high alumina stuffing sand (4) dosage=MAX (A1, A2, A3, A4, A5, A6)；
C) chromium matter stuffing sand (9) dosage with " ladle nozzle difference service stage chromium matter stuffing sand (9) research on maximum utilized quantity MAX (B1, B2,
B3, B4, B5, B6) " it is used as benchmark, it may be assumed that chromium matter stuffing sand (9) dosage=MAX (B1, B2, B3, B4, B5, B6).
D) single bag of stuffing sand weight is determined:
Single bag of high alumina stuffing sand (4) weight=MAX (A1, A2, A3, A4, A5, A6) ÷ 2；
Single bag of chromium matter stuffing sand (9) weight=MAX (B1, B2, B3, B4, B5, B6) ÷ 2；
S3, the preparation before filling sand is carried out, concrete operations are as follows:
Under ladle horizontality, ladle upper nozzle (12) channel and bowl portion (3) region are washed with coaloust-oxygen gun burning, it is ensured that ladle upper nozzle
(12) and pocket block layer (10) is without residue, residual steel, and ladle is tumbled to packet mouth apart from 60 ° -80 ° of vertical line, and stops 3-5 points
Clock, it is ensured that ladle is tumbled to steel ladle opening upward again after no shoddye outflow；
S4, fill sand: steel ladle opening under state, is initially charged with two bags of high alumina stuffing sands (4) by filling sand rifle, is packed into two bags of chromium afterwards upward
Matter stuffing sand (9).
3. a kind of stuffing sand for being conducive to improve IF steel cleanness according to claim 2 fills sand method, it is characterised in that:
In step sl, select the concrete mode of stuffing sand type as follows:
1) molten steel channel (5) part: filling high alumina stuffing sand (4)；
2) the rim of a bowl (3) part: high alumina stuffing sand (4) are filled in lower part about 1/2, and chromium matter stuffing sand (9) are filled on top about 1/2；
3) brick cup top stuffing sand protrusion part (8): filling chromium matter stuffing sand (9).
4. a kind of stuffing sand for being conducive to improve IF steel cleanness according to claim 3 fills sand method, it is characterised in that:
The high alumina stuffing sand (4), the chemical composition of chromium matter stuffing sand (9) are as follows:
High alumina stuffing sand (4): Al2O3>=65.0%, SiO2≤ 25.0%, Fe2O3≤ 4.5%, H2O≤0.5%, granularity (0.15-
1mm) >=90%；
Chromium matter stuffing sand (9): Cr2O3>=30.0%, SiO2≤ 35.0%, Fe2O3>=10%, H2O≤0.5%, granularity (0.15-
1mm) >=90%.
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| CN110357644A (en) * | 2019-06-26 | 2019-10-22 | 马鞍山市宁生耐火材料有限责任公司 | A kind of aluminum environment-friendly type stuffing sand and its production technology and application |
| CN110681851A (en) * | 2019-11-08 | 2020-01-14 | 鞍山市和丰耐火材料有限公司 | Compositely-thrown steel ladle chromium drainage agent with ultrahigh self-pouring rate |
| CN113275552A (en) * | 2020-12-08 | 2021-08-20 | 常熟市龙腾特种钢有限公司 | Drainage sand filling method capable of improving self-opening rate of steel ladle |
| CN114985718A (en) * | 2022-06-13 | 2022-09-02 | 首钢京唐钢铁联合有限责任公司 | Composite type drainage sand and use method thereof |
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| CN110357644A (en) * | 2019-06-26 | 2019-10-22 | 马鞍山市宁生耐火材料有限责任公司 | A kind of aluminum environment-friendly type stuffing sand and its production technology and application |
| CN110681851A (en) * | 2019-11-08 | 2020-01-14 | 鞍山市和丰耐火材料有限公司 | Compositely-thrown steel ladle chromium drainage agent with ultrahigh self-pouring rate |
| CN110681851B (en) * | 2019-11-08 | 2021-05-04 | 鞍山市和丰耐火材料有限公司 | Compositely-thrown steel ladle chromium drainage agent with ultrahigh self-pouring rate |
| CN113275552A (en) * | 2020-12-08 | 2021-08-20 | 常熟市龙腾特种钢有限公司 | Drainage sand filling method capable of improving self-opening rate of steel ladle |
| CN114985718A (en) * | 2022-06-13 | 2022-09-02 | 首钢京唐钢铁联合有限责任公司 | Composite type drainage sand and use method thereof |
| CN114985718B (en) * | 2022-06-13 | 2024-06-07 | 首钢京唐钢铁联合有限责任公司 | Composite drainage sand and use method thereof |
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