JPS59102866A - Refractories for ladle, tandish lining and lance pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to refractories for ladles, tongue push linings, and lance pipes, and its purpose is to improve spalling resistance, erosion resistance, and durability, etc. Our goal is to provide refractories with high quality materials.

It is well known that waxy and silicic refractories have been mainly used as refractories for lining ladle. However, in recent years, with the increase in ladle refining such as continuous casting and vacuum degassing, the operating conditions of the ladle are becoming increasingly severe, such as receiving steel at high temperatures and lengthening the residence time. In particular, the sludge ladle of the ladle is the most severely damaged, and there is a demand for the development of a high-quality, long-life lining material corresponding to this. For these reasons, attempts have been made to apply basic refractories and alumina refractories such as Macnesia spinel and Macnesia positive materials, which have high refractory properties and high slurry resistance, to the sludge in the ladle. , When magnesia spinel refractory is used for lining the slag line of a ladle, the large resistant material is a heat resistant spor link, a rigid spor link, etc.
Due to poor corrosion resistance, corrosion resistance, and stain resistance, it is inevitable that a part of the refractory will peel off, and furthermore, depending on the operating conditions, a part of the refractory will be eroded and damaged. do not have. Furthermore, when a magnesia carbon refractory is used to line the slag line of a ladle, the carbon in the refractory is oxidized by the atmosphere, molten steel, or oxygen in the slag, and the oxidized portion is further altered by the slag. As a result, it is inevitable that a portion of the lining will melt or peel off. Furthermore, when an alumina refractory is used for lining the slag line of a ladle, the refractory has poor spalling resistance such as heat resistance and structural resistance to spalling.

It is inevitable that a part of the refractory material will peel off. In addition, attempts have been made to add spinel, carbon, etc. to improve the spalling resistance of the above refractories, but satisfactory results have not yet been obtained.

Magnesium-based refractories, magnesia carbonaceous materials, and alumina-based refractories have the above-mentioned drawbacks. Therefore, when the side wall of the ladle is made of zircon-based refractory material, the durability of these materials in the slag line is limited to that of the side wall. However, the current situation is that the life of refractories that can be obtained is only ~%, and that the development of refractories that can obtain a life equivalent to that of side walls is currently desired.

In view of the current situation, the present inventors have conducted conceptual research in order to develop a refractory with excellent spalling resistance, erosion resistance, tarnish resistance, etc. In the research process, we first examined the conventional zircon refractories used for the side walls of ladle.

This refractory contains Zr0240-66% by weight and 5t023
It is made of 2 to 40% by weight of silky material and has excellent spalling resistance and sponging resistance.

However, the refractory has CaO, which is one of the components in the slab.
It was found that a low-melting point product was produced by the reaction with the metal, and the corrosion resistance was insufficient.

As a result of further studies, we found that by adjusting the ZRO2 component to the following specific ratio, we were able to create a desired refractory that maintains properties such as spalling resistance and stain ink resistance, and has significantly improved erosion resistance. was found to be obtained. The present invention has been completed based on this knowledge.

That is, in the present invention, (α) 20 to 95 parts by weight of a granular zirconia raw material containing 60% by weight or more of ZRO2, and (h) 5 to 80 parts by weight of a powdery granular zirconia raw material containing 80% by weight or more of ZrO2 are blended. A ladle, a refractory for tongue-push lining and a lance-pipe, and (σ) ZrO2.
Powdered zircon raw material containing 60% by weight or more of
(A) 5 to 80 stacked parts of powdered granular zirconia raw material containing 80% by weight or more of ZrO2, and (c) fine powdered chromium oxide raw material containing 90% by weight or more of Cr2O, as described above (α). This invention relates to a refractory for ladle, tongue push lining, and lance pie, characterized in that 0.5 to I5 weight is blended with respect to the total amount of component (h).

The refractory of the present invention has excellent spalling resistance, erosion resistance, toughness resistance, cracking resistance, etc. Therefore, even when the refractory is used for lining the slag line of a ladle, the service life It can be extended to 2 to 3 times or more than that of conventional magnesia spinel, magnesia carbon, and alumina refractories, and can be suitably used as a ladle lining. The refractory of the present invention can also be suitably used as a tongue push lining or a lance push lining.

The zircon raw material used in the present invention has a ZrO2 content of 60% by weight or more (hereinafter simply referred to as "river"), and usually contains 66% ZrO2-containing filth such as zircon raw material do and zircosi flower.
The one before and after is used.

If the content of Zr(-)2 is less than 60 inches, the corrosion resistance of the resulting large product tends to decrease, which is disadvantageous.In addition, the particle size of the zircon raw material of the present invention is particularly limited. However, those with a diameter of 0.420m5 or less are usually used.

The zirconia raw material used in the present invention is 1r02
Those containing f4t of 80% or more, preferably 90 to 99t are used. Zr (J2 acid content is less than 80%) is disadvantageous as it tends to reduce the corrosion resistance of the refractory obtained. The particle size of the zirconia raw material of the present invention is not particularly limited, but It is usually best to use a value of 0-044yys or less.

The blending ratio of Silkoshi raw materials and Luconia raw materials is as follows:
It is preferable that the former: 20 to 95 parts by weight of the latter: 5 to 80 parts by weight. Composition of zirconia raw materials
; is less than 5 parts by weight (hereinafter simply referred to as "parts"),
This tends to make it impossible to impart excellent rigid erosion resistance to the resulting refractory. Furthermore, if the amount of the zirconia raw material exceeds 80 parts, the structural sporicity resistance of the resulting refractory tends to decrease. In the present invention, the mixing ratio of the zircon raw material and the zirconia raw material is the former: the latter = 50 to 80 parts: 20 to
Particularly preferred is 50 parts.

Furthermore, in the present invention, it is preferable to blend a chromium oxide raw material with the silicone raw material and the zirconia raw material.

As the chromium oxide raw material, it is preferable to use one containing 90% or more of Cr2O3, preferably 95 to 99%.

The particle size is not particularly limited, but is 0.044
Those below the fin are usually used. The above oxidized aluminum raw material is usually blended in an amount of about 0.5 to 15%, preferably about 1 to 5%, based on the total amount of the zircon raw material and the zirconia raw material. By blending the above-mentioned chromium oxide raw material, various physical properties such as erosion resistance and spalling resistance of the refractory obtained can be further improved.

To manufacture the refractory of the present invention, the above-mentioned zircon raw material, zirconia raw material, and chromium oxide raw material are blended in predetermined amounts, an appropriate binder is added, cross-wired, and then molded and fired. As the binder, a wide variety of conventionally known binders can be used, such as Bunbun solution, carboxydimethylcellulose D-solution,
Examples include organic binders such as a solution of zirconium sulfonate and a solution of sulfonate of zirconium, and inorganic binders such as a solution of zirconium salts, silicate, and silicadyl. Use of binderq
- For binding, the usual amount used is sufficient, and for example, it is preferable to use about 1 to 5 parts based on the total amount of the zirconia raw material, the zirconia raw material, and the chromium oxide raw material. Conventionally known kneading methods such as a wet pan etc. can be widely used for the kneading. Further, the subsequent molding may be performed either under normal pressure or under pressurized pressure, and any conventionally known molding equipment can be used for the molding. When molding is carried out under pressure, the pressure is usually 400~
It is preferable to set it to about 2000 Kp/-. Further, the firing is usually carried out at 1500°C or higher, preferably at about 1600 to 1700°C.

Examples are given below.

Example 1 The zircon raw materials (zirconia sand, zircosi flower), zirconia raw materials, and oxidized aluminum raw materials listed in Table 2 below are used. These raw materials were blended in the proportions shown in Table 2 below, and added with 2% carboxydimethyl trose as a binder.
The aqueous solution was added three times to the outside, and after kneading, it was molded into a standard shape using a 150-ton friction press, and then a 16-ton
A refractory was obtained by firing at 00°C for 5 hours. The physical properties of the obtained refractory are shown in Table 2 below.

Table 1 Examples When the product of the present invention (, () was used by lining the slag line of a 270-t υ ladle, there was no sporic damage, and there was no damage to the slag line.
A good result was achieved, with no damage caused by the bricks, and the service life was 2.1 times longer than that of conventional magnesia spinel bricks.

Example 3 When the product (B) of the present invention was used to line the slag line of a 270-ton ladle, there was no spalling (!
It has a lifespan three times that of a 9-wall brick, and has a lifespan equivalent to that of a brick on one side of the wall, resulting in a good bond.
I got 1.

(that's all) +'lI Agent, Patent Attorney, San Ei, Nii 4:.

Procedural amendment (Responsible Patent Office Commissioner Kazuo Wakasugi 1, Indication of the case, 1982, Property Permit No. 212546, Publication 3, Person making the amendment Relationship with the case Patent applicant 4, IO of agent Hiranocho 2, Higashi Ward, Osaka City) Heiheiwa Building main phone number 06203
-0941 (6521) Patent Attorney Hide Saegusa
Two ~.

5. Date of the amendment order 8. Contents of the amendment As shown in the attached attached sheet, content of the amendment 1 Page 9 of the specification, 4th line from the bottom to the bottom line ``Under normal pressure and...''
``The pressure is...'' is deleted.

(that's all)

Claims (1)

[Scope of Claims] (α) 20 to 95 parts by weight of powdery zircon raw material containing 60% by weight or more of ZrO2, and (A) 5 to 80 parts by weight of powdery granular zircon raw material containing 80% by weight or more of ZrO2. A refractory for ladles, tongue push linings, and lance pipes, characterized by containing the following. ■(α) 20 to 95 parts by weight of powdery zircon raw material containing 60% by weight or more of ZrO2, (h) 5 to 80 parts by weight of powdery granular zirconia raw material containing 80% by weight or more of ZrO2, and (') 90 parts by weight of Cr2O3. A ladle and a tank characterized by blending 0.5 to 15 weight t% of a finely powdered oxidized raw material containing 0.5 weight % or more with respect to the amount of the above-mentioned (α) component and (A) component. Refractories for push lining and lance lining.