JPS58204867A - Manufacture of carbon-oxide refractories - 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 a method for producing a carbon-oxide refractory suitable for continuous casting refractories, converter lining materials, and the like.

Carbon-oxide refractories are widely used in the steel manufacturing field as refractories with excellent spall resistance and erosion resistance due to the presence of carbon components. However, it is not yet perfect, and due to recent harsher usage conditions, there is still much room for improvement in its spalling resistance and erosion resistance.

The present invention has made eight technical improvements to further improve the above characteristics of these carbon-oxide refractories.

Conventionally, pitch and phenol formaldehyde resins have been known as binders for this type of refractory, but in most cases they are often used alone.

Therefore, the present inventors found that when a specific type 1 pitch and phenol formaldehyde resin were used together as a binder for the above refractories, the bonding after firing or during use was more effective than using each of them alone. The carbonization yield of the agent is improved, which in turn increases the Kagensend density due to the carbonization of the binder.
It has been found that the fracture strength of carbon-oxide refractories is improved.

That is, as shown in Figures 1 to 3, the points - are the carbon yields measured when carbonized individually, and the solid lines are actual measured values, but as is clear from these data. It can be seen that the carbon yield can be improved by using a thermosetting phenol formaldehyde resin together with the specific type of pitch described above. And the improvement in this Haiito convergence was recognized! If the missing element is applied to the cutting of the missing element, the 4th and 1st. Figure 5 Q'] 1. This is 70wt% alumino grains and 30wt% graphite grains.
In this regard, thermosetting phenol formaldehyde resin and pitch, which have been shown to improve the carbon yield as described in A+J, were used in various combination ratios, and 15 wt of the outer layer was added as a bonding agent, mixed, and molded.

This is a measurement result of bending strength after reduction firing.

As is clear from these results, it is clear that pitch and phenol-formal I are more likely to use specific (cao-cai pitch and thermosetting steel 1') than to be used in humans. Therefore, it can be seen that the rupture strength is improved by setting f6Ai.

The details of the present invention are as follows.

The refractory oxidized particles used in the present invention contain one or more types of fermentable, neutral, and basic chlorinated substances and have a weight value of 40 to 90 wt, preferably 45 to 85 wL. 40wt Yui F
Now, let's compare the aggregate and L ``C no 1iIIA' characteristics with light minute 14C.
When the torque exceeds 90 wt, the spall resistance decreases. Carbon can be used regardless of whether it is crystalline or amorphous; for example, it is one or two or more types selected from scaly graphite, earthy graphite, electrode scraps, coke, Kazen 7 Eye Blue, etc., and the ratio is 10 ~60 wt%. If carbon is less than 10wtfb, carbon will not have the ability to wet molten steel or absorb the expansion and contraction of blended raw materials;
When vrt is 4 or higher, oxidation resistance is poor.

Also, 1. The pitch used is BS component 45wt4 or more.

When the QI component is 20 vt% or less, the phenol formaldehyde resin to be used is limited to thermosetting, as described above, depending on whether or not the carbon yield can be improved by using the resin in combination.

The reason for the improved carbon yield in the specific system mentioned above is that the thermosetting phenol formaldehyde resin makes the pitch infusible at lower temperatures, speeds up carbonization, and improves the overall carbon yield when used in combination. It is estimated that the BS content is 45 wt% or less.

For pitches with a QI component of 20 wt4 or higher, infusibility of the pitch itself occurs at low temperatures, so the contribution of the thermosetting phenol formaldehyde resin to the infusibility of the pitch is small;
It is presumed that the carbon yield was not different from the calculated value when each was used alone.

Furthermore, the thermosetting formaldehyde resin mentioned here is
It may be a resol type, a rack type, or a liquid or a powder, but in the case of a powder, it is preferably 60 mm or less. This is due to the dispersion effect on the formulation. When adding it to a carbon oxide formulation, it may be suitably diluted, dissolved and dispersed in an organic solvent such as methanol or ethanol, or diluted, dissolved and dispersed together with powder pitch in an organic solvent.

When the pitch used in the present invention is used in the form of powder as described above, it is desirable that the pitch be vC60 mesh or less because of its dispersion effect. In addition, 1 ml of the peroxide-based blended particles is coated in advance for stammering.

Example 1 is shown below. The results show that (Konren,
Molding (100okg/crn2), reduction firing (1000kg/crn2)
These are the results of measuring the sample after 3 hours (°C x 3 hours) based on JIS.

It is useful as a refractory for continuous casting, a converter lining material, and can be fully applied as a high-life furnace material.

[Brief explanation of the drawing]

FIG. 1: A graph showing a pitch-phenol formaldehyde resin system in which an improvement in carbon yield is observed. FIG. 2: Graph showing a pitch-phenol formaldehyde resin system in which no improvement in carbon yield is observed. FIG. 3: Graph showing a pitch-phenol formaldehyde resin system in which no improvement in carbon yield is observed. Figure 4; Graph showing the room temperature bending strength (at room temperature) of alumina 〇 material with thermosetting phenol formaldehyde □ resin and pitch as binders. Figure 5; Thermosetting phenol formaldehyde resin and pitch as binders. A graph showing the room temperature bending strength (hot 1400℃) of alumina material.
2 resole tide, My+f-200) CB
S"55wt%, Ql-nol?wt%) Fig. 2 Kensou, 11 Apiyto (noo, uv')'lI fu', r'In?b00)
(F55=, 5.5utt%, QI4!wt%
) No. 31it Phenol Formaldehyde Ml 1la (loo8P
)Uoo8P) (Resono L type, F'ln 2200)
(F5s40ui)%, QhiSraノ%) Figure 4 [15b"5V5wt%+'JlMinonjtnt%)
No. 514 (700p) (lOOgI
II In procedural amendment] Ha I'l ノ1 person Ko Showa 7 in l" Qlf +fth f! 1st tH F θ name Jn1-te (Mengmi male 4 representative person 11jI, I l Sode Tadashi I will supplement the dC bottle song in the specification of the main application. 4) Correct "95" in the "Rice product l" column to "rloO". 2. In the 6th negative subscript, change "Comparative example 1" to "Conventional product l". ] Correct.

Claims (1)

[Claims] Refractory oxide particles 40 to 90 vL% by weight
. In a formulation consisting of 10 to 60 wtl of carbon, BS component 45
Pitch with a wt of 1 or more and a QI component of 20/vt of 9g or less is combined with thermosetting phenol formaldehyde resin.
A method for producing a carbon-oxide refractory, which comprises adding 15 to 20 wtl, kneading, shaping, drying, and, if necessary, firing.