CN101618966B

CN101618966B - Ladle castable

Info

Publication number: CN101618966B
Application number: CN2008101227712A
Authority: CN
Inventors: 洪建国; 管灿
Original assignee: Shanghai Meishan Iron and Steel Co Ltd
Current assignee: Shanghai Meishan Iron and Steel Co Ltd
Priority date: 2008-06-30
Filing date: 2008-06-30
Publication date: 2012-04-25
Anticipated expiration: 2028-06-30
Also published as: CN101618966A

Abstract

The invention relates to ladle castable. The use of the castable can reduce the slag adhesion of ladles, improve the yield of hot metal and operation efficiency, and can reduce the maintenance cost for the ladles. The ladle castable comprises the chemical components in percentage by weight: 45 to 60 percent of Al2O3, 30 to 40 percent of SiO2, 5 to 15 percent of ZrO2, less than 1 percent of CaO, and 2 to 5 percent of SiC. The ladle castable is used for integral casting of the ladles.

Description

A kind of ladle castable

Technical field:

The present invention relates to a kind of unsetting mould material, particularly a kind of ladle castable that is used for integrated poured usefulness on the hot metal ladle working lining.

Background technology:

The use link of hot metal ladle is the important step on Iron And Steel Company's whole production flow line, and whether it safe and efficient is directly connected to and produces whether trouble-free operation.The normal used anti-material of steel mill's hot metal ladle is main with amorphous refractories such as clay brick, high alumina bricks, and the bricking material often exists brickwork joint and step, is prone to make molten iron slag land; And then cause dry slag, and hot metal ladle bag mouth dry slag is especially remarkable, and its harm is to cause the hot metal ladle crank; Can't desulphurization and slag skimming, even can't convert iron to converter fully, must roll off the production line and carry out scarfing cinder and handle; Thereby cause hot metal ladle operating rate and molten iron yield to reduce; It clears up difficulty, causes anti-material to damage during cleaning again easily, and this certainly will increase working strength of workers and refractory consumption.

The present invention is directed to the hot metal ladle working lining dedicated pouring material that this has developed good, the anti-erosion of a kind of antistripping property, anti-ly washes away, anti-stick slag property is good, the use of this material greatly reduces hot metal ladle dry slag situation, domestic existing ladle castable but its material is with Al ₂O ₃-SiC-C is main mould material, and this material can adapt to the use temperature of hot metal ladle, and intensity improves its work-ing life than high energy, so adopted by some producer, its shortcoming is easy oxidation, and slag resistance is poor, and mould material of the present invention is with Al ₂O ₃-SiO ₂-ZrO ₂For the mould material of staple then well addresses this problem.

One Chinese patent application 200510040960.1 discloses " a kind of spinel low-cement functional refractory material pouring material "; This kind material contains magnesium-aluminium spinel 40-65%, white fused alumina 15-40%, activated alumina 3-15%; Magnesium zirconium eutectic material 0.5-8%; Cement 2-5%, admixture 0.01-4.7%, water 3-7%.This mould material does not contain the Cr element, has avoided the pollution problem of Cr to environment.Because the use of magnesium zirconium eutectic material makes this mould material have good thermal shock resistance again, its main purpose is to solve the pollution problem of raw material to environment.

Summary of the invention:

The purpose of this invention is to provide a kind of integrated poured mould material of hot metal ladle that is used for, mainly reduce the dry slag serious situation of hot metal ladle,, reduce scarfing cinder difficulty and maintenance cost simultaneously to improve the yield and the operational efficiency of molten iron.Technical scheme of the present invention is: a kind of integrated poured mould material of hot metal ladle that is used for, the weight percent of its chemical composition is: Al ₂O ₃: 45～60%; SiO ₂: 30～40%; ZrO ₂: 5～15%; CaO:＜1%; SiC:2～5%.

This mould material is with mullite (3Al ₂O ₃2SiO ₂) be staple, be Al ₂O ₃-SiO ₂The important composition phase of series refractory material.And rich SiO ₂The mullite synthetic material have mullite and form interlacing network structure; Be filled with the microstructure of certain persilicic glassy phase therebetween; More help absorbing thermal stresses, it is good to have a creep resistance, and coefficient of thermal expansion is low; Good thermal shock stability is embodied in its anti-erosion, anti-ly good use properties such as washes away.Add heat-resistant steel fiber in the material to improve antistripping property.Simultaneously, in mould material, introduced the oxide compound ultrafine powder to improve fillibility and coking property; Matrix forms the interlacing microstructure of mullite crystal, in order to improving thermal shock resistance and thermal structure intensity; Size-grade distribution adopts multiple stage material compounding, has introduced measures such as silicon oxide and ultra-fine alumina powder and employing high efficiency water reducing agent, the construction amount of water is greatly reduced, thereby improve density, reduces void content, raising intensity.In addition, set about from controlling chemistry-mineral composition, adjustment mould material used material combination is introduced slag and is difficult to the component (like the Silicon-rich mullite mutually) that moistening component (like zirconium white) and slag are difficult to permeate, thus the minimizing dry slag.

The invention has the beneficial effects as follows, alleviated the dry slag of hot metal ladle, reduced the scarfing cinder time, reduced maintenance cost and repair density, improved the utilization ratio of hot metal ladle.

Embodiment:

Ladle castable is flint clay grog, fused mullite, zircon, special grade bauxite chamotte powder, flint clay chamotte powder, amorphous silicon oxide micro mist, α-Al ₂O ₃Aluminous cement, steel fiber are formed, and its weight percent consists of: flint clay grog 60～68%, fused mullite 5～10%; Zircon 4～8%, special grade bauxite chamotte powder 3～5%, flint clay chamotte powder 4～12%; Unsetting ultrafine silica powder 4～8%, α-Al ₂O ₃Aluminous cement 8～10%, steel fiber 2～8%.

The example that this ladle castable is implemented is seen table one.

Table one: ladle castable proportioning example table

	The flint clay grog	Fused mullite	Zircon	The special grade bauxite chamotte powder	The flint clay chamotte powder	The amorphous silicon oxide micro mist	Aluminous cement	Steel fiber
									The present invention	60～68％	5～10％	4～8％	3～5％	4～12％	4～8％	8～10％	2～8％
Embodiment 1	60.0	10	4.5	3.0	4.0	8.0	8.0	2.5
									Embodiment 2	62.0	9.5	5.0	3.2	5.0	5.3	8.0	2.0
Embodiment 3	62.1	9.0	5.2	3.5	5.2	5.0	8.0	2.0
									Embodiment 4	63.0	6.0	7.0	3.5	5.5	4.8	8.0	2.3
Embodiment 5	63.5	5.0	8.0	3.6	5.6	4.0	8.2	2.1

The corresponding chemical ingredients of this mould material that obtains is seen table two.

Table two: the chemical ingredients that ladle castable is corresponding

	Al ₂O ₃	SiO ₂	ZrO ₂	CaO	SiC
						Composition	45～60％	30～40％	5～15％	＜1％	2～5％
Embodiment 1	45	40	12	0.2	2.8
						Embodiment 2	50	38	8.2	0.6	3.2
Embodiment 3	58	33	5.8	0.0	3.2
						Embodiment 4	59	31	6.8	0.1	3.1
Embodiment 5	60	30	7.2	0.1	2.7

The on-the-spot method of use of this mould material is:

Preparation work before 1 construction

(1) mould material is transported to the user scene, must guarantee that storage space can be rainproof, moistureproof, guarantees that material is dry before cast, no caking phenomenon.

(2) whether various construction equipments of inspection and electrical equipment move normally.

(3) installing of loose tool must be accurately, firmly, smoothly.Mould tire surface is brushing one deck butter or used oil in advance, or sticks one deck strawboard in order to the demoulding.

(4) adopt forced mixer to mix.Preparation quantitatively adds the weighing utensil and the container of water.

(5) preparation insertable high-frequency vibration rod.

2 mix

(1), be that unit confirms feeding quantity with whole bag according to stirrer capacity and speed of application.

(2) mixing water adopts clean industrial tap water.Amount of water can suitably be adjusted according to site specific, and the good fluidity until material is suitable for vibratory compaction.

(3) material of adding stirrer is done and is mixed after 1 minute, quantitatively adds water while stirring.Wet mixing got final product blowing in 3 minutes after adding entry.

(4) material that has at every turn mixed must use up in 30 minutes, and the material of overtime flowability variation forbids to come into operation or return stirrer, sneaks into the next batch virgin material.

3 cast

(1) answer multiple spot evenly reinforced.When reinforced, open vibrating head, the vibration while feed in raw material finishes until reinforced, till vibrating 2-3 minute again with surperficial bleeding and not having a great amount of bubbles discharge.Whole bag should be constructed continuously, once accomplishes.

(2) the vibrating head operator should make vibrating head slowly move, and must not shake for a long time on one point, also must not vibrate for a long time and causes expecting segregation.The construction after vibration rod that finishes should slowly be extracted, and in material, does not stay the hole, hole after control is extracted vibrating head.

4 demouldings, maintenance

Can the demoulding after must leaving standstill together with mould after the moulding, must continue maintenance under field conditions (factors) after the demoulding.

5 bakings

The ladle castable use of after scene baking, can directly reaching the standard grade after the maintenance.

Claims

1. a ladle castable is characterized in that: be by flint clay grog, fused mullite, zircon, special grade bauxite chamotte powder, flint clay chamotte powder, amorphous silicon oxide micro mist, α-Al ₂O ₃Aluminous cement, steel fiber are formed, and its weight percent consists of: flint clay grog 60～68%, fused mullite 5～10%; Zircon 4～8%, special grade bauxite chamotte powder 3～5%, flint clay chamotte powder 4～12%; Amorphous silicon oxide micro mist 4～8%, α-Al ₂O ₃Aluminous cement 8～10%, steel fiber 2～8%.