CN105461323A - Tundish dry working lining material and application method thereof - Google Patents

Abstract

The invention relates to a tundish dry working lining material and an application method thereof. The tundish dry working lining material is a uniform mixture of fused magnesia, dead burned high-calcium magnesite, graphite, a composite additive and phenolic resin. Water and stirring machines are not needed when the material is constructed, and the material can be used after being baked at a low temperature for 2h; and the material has the advantages of no explosion or spalling in the baking process, good adhesiveness with a permanent lining, no falling or collapsing, easy and convenient removal of steel slag shells after being used, no damages to the damage permanent, and good erosion resistance. The material disclosed in the invention has better workability and longer service life than present tundish coatings.

Description

A kind of tundish dry working lining and application process thereof

Technical field

The present invention relates to technical field of refractory materials, particularly relate to a kind of tundish dry working lining and application process thereof.

Background technology

Greatly develop today of high efficiency continuous casting in China, Technology of Tundish Metallurgy comes into one's own day by day, and it to have become in steel smelting procedure in the end stage topmost refining vessel, and keeps the large-scale development.It is positioned in the middle of ladle and crystallizer, therefore the refractory quality of liner in dundish, and to the clean steel-making of guarantee, sequence casting and tundish keep the large-scale development most important.

And the existing liner in dundish coating generally used, material is mainly magnesia.Its tool work-ing life is relatively long, do not pollute the advantages such as molten steel.But it adds the water of 15%-20% executing man-hour requirement.Fully need stir and could apply with stirrer, make site operation more complicated, owing to adding water when coating uses, reduce working strength and the anti-scour property of coating, add baking time, increase the turnround of tundish, add simultaneously water paint easily with the adhesion of tundish permanent liner, cause skull to remove difficult.

Summary of the invention

Do not add water when the object of this invention is to provide a kind of construction, without Mixing Machine, low-temperature bake just can use after 2 hours.Do not burst in bake process, do not peel off, good with permanent liner adhesivity, do not fall after rise and cave in, easy and convenient with rear removing residual slag shell, and do not damage permanent liner.Resistance to fouling is good, and use longevity Yu be greatly improved.Also make molten steel note the corresponding minimizing of crop of surplus and strand, and meet the needs of clean steel-making, therefore the magnesium calcium carbon tundish dryness working lining that vibrates reduces steel production cost to a certain extent.

In magnesium calcium carbon of the present invention, being responsible for a task until it is completed property of intercropping work wadding is by electrosmelted magnesite clinker calcium magnesia sand, and crystalline flake graphite is main body, the unsetting uniform mixture be made up of following component; Its component is by weight percentage: the electrosmelted magnesite clinker of 10%-20%, the calcium magnesia sand of 30%-60%, the composite additive of 5%-15%, the resol of 5%-15%, and above each component weight sum is 100%.

Described electrosmelted magnesite clinker≤0.09mm, described calcium magnesia sand is 0.5mm-3mm;

Described electrosmelted magnesite clinker, its quality index is Mg0>=96%, Si0 ₂<0.90%, Fe ₂0 ₃<0.42%, burns and loses <0.20, particle volume density >3.50g/cm ³;

Described calcium magnesia sand, its quality index is: Mg0>=62.5%, Ca0>=32%, A1 ₂0 ₃>=0.42%, Si0 ₂≤ 0.75%, Fe ₂0 ₃<0.45%, volume density >3.4%g/cm ³;

The quality and technical index of crystalline flake graphite is: fixed carbon >=95.00%, volatile matter≤1.3%, moisture≤1.2%;

Described composite additive is: Si0 ₂micro mist 3%, Pure Silicon Metal 3%, carbon ink 4%, soft clay 3%, the uniform mixture of totally four kinds of materials;

Described resol softening temperature is: 70 DEG C-100 DEG C;

The application process of a kind of tundish of the present invention dry working lining is as follows:

(1) the former remaining working lining of tundish is cleared up;

(2) dropped in tundish by dryness material, pave rear tamping, its thickness is 80-100mm;

(3) loose tool to be hung in tundish and to adjust the spacing of loose tool and permanent liner, ensureing that its spacing is 60mm-90mm, afterwards dryness material is dropped between permanent liner and loose tool, beat reality with pneumatic pick;

(4) construction body 200-300 DEG C of temperature gas fire is toasted 3 hours, hang out and can come into operation after waiting loose tool to be cooled to room temperature.

The invention provides a kind of bag dry working lining of high-quality, by the enforcement of product of the present invention, improve the work-ing life of working lining, ton steel refractory consumption amount is reduced; Also make note surplus and the corresponding minimizing of strand crop simultaneously, reduce steel production cost.

Embodiment

Following examples are that the present invention goes out to set forth further.

According to preferred version material component of the present invention, prepared a collection of tundish dry working lining, it adopts each raw materials quality technical indicator detected result as follows:

Electrosmelted magnesite clinker, its quality index is Mg0>=96%, Si0 ₂<0.90%, Fe ₂0 ₃<0.42%, burns and loses <0.20, particle volume density >3.50g/cm ³;

Calcium magnesia sand: Mg0>=62.5%, Ca0>=32%, A1 ₂0 ₃>=0.42%, Si0 ₂≤ 0.75%, Fe ₂0 ₃<0.45%, volume density >3.4%g/cm ³;

The quality and technical index of crystalline flake graphite is: fixed carbon >=95.00%, volatile matter≤1.3%, moisture≤1.2%;

Composite additive is: Si0 ₂micro mist 3%, Pure Silicon Metal 3%, carbon ink 4%, soft clay 3%, the uniform mixture of totally four kinds of materials;

Resol softening temperature is 70 DEG C-100 DEG C;

The quality index of the dry working lining produced is: Chemical Composition Mg059.5g%, Ca019.5%, C9%; Physicals is 300 DEG C × 3h, compressive strength 47.5MPa, folding strength 9.5MPa, volume density 2.68g/cm ³, compressive strength 56.8MPa after 1500 DEG C × 3h burns, folding strength >12MPa, volume density 2.6g/cm ³.

Use on certain iron and steel enterprise's tundish with product of the present invention, form of construction work as previously mentioned bag base thickness degree is 70mm, and limit thickness 60mm draws steel 72 hours continuously, and Lian Lalu number is 131 stoves, because other factors is stopped using.Slag line residual thickness 12-16mm, de-containing easily.

Claims (8)

1. a tundish dry working lining and application process thereof, it is characterized in that: its component is by weight percentage: the electrosmelted magnesite clinker of 10%-20%, the calcium magnesia sand of 30%-60%, the composite additive of 5%-15%, the resol of 5%-15%, above each component weight sum is 100%.

2. a kind of tundish dry working lining according to claim l, is characterized in that: described electrosmelted magnesite clinker≤0.09mm, and described calcium magnesia sand is 0.5mm-3mm.

3. a kind of tundish dry working lining according to claim l, is characterized in that described electrosmelted magnesite clinker, and its quality index is Mg0>=96%, Si0 ₂<0.90%, Fe ₂0 ₃<0.42%, burns and loses <0.20, particle volume density >3.50g/cm ³.

4. a kind of tundish dry working lining according to claim l, it is characterized in that described calcium magnesia sand, its quality index is: Mg0>=62.5%, Ca0>=32%, A1 ₂0 ₃>=0.42%, Si0 ₂≤ 0.75%, Fe ₂0 ₃<0.45%, volume density >3.4%g/cm3.

5. a kind of tundish dry working lining according to claim l, is characterized in that the quality and technical index of crystalline flake graphite is: fixed carbon >=95.00%, volatile matter≤1.3%, moisture≤1.2%.

6. a kind of tundish dry working lining according to claim l, is characterized in that described composite additive is: Si0 ₂micro mist 3%, Pure Silicon Metal 3%, carbon ink 4%, soft clay 3%, the uniform mixture of totally four kinds of materials.

7. a kind of tundish dry working lining according to claim l, is characterized in that: described resol softening temperature is: 70 DEG C-100 DEG C.

8. a kind of tundish dry working lining according to claim l and application process thereof, is characterized in that: its application process is:

(1) the former remaining working lining of tundish is cleared up;

(2) dropped in tundish by dryness material, pave rear tamping, its thickness is 80-100mm;

(3) loose tool to be hung in tundish and to adjust the spacing of loose tool and permanent liner, ensureing that its spacing is 60mm-90mm, afterwards dryness material is dropped between permanent liner and loose tool, beat reality with pneumatic pick;

(4) construction body 200-300 DEG C of temperature gas fire is toasted 3 hours, hang out and can come into operation after waiting loose tool to be cooled to room temperature.