JPH01285856A - Method for evaluation test of checker refractory - Google Patents

Abstract

PURPOSE:To accurately select material by accurately reproducing the state in an actual furnace, by forming a crucible hole to checker refractory to charge a corrosive substance therein and applying load to the checker refractory under heating. CONSTITUTION:A crucible hole 2 is formed to the central part of a sample 1 and, for example, a mixture consisting of 75% of Na2SO4 and 25% of SiO2 is charged in said hole 2 as a corrosive substance 3. Next, the upper part of the hole 2 is closed by corrosion-resistant refractory 4 and predetermined load applying refractory 5 is placed on the refractory 4 and the whole is set in a test furnace and held for a predetermined time to perform an evaluation test. By this method, such a state that the refractory is exposed to high temp. in the presence of the corrosive substance in an actual furnace is accurately reproduced. Therefore, it can be accurately judged which kind of materials is selected for checker refractory.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industry - Field of Application] The present invention relates to an evaluation test method for a +1 car refractory used in a heat storage chamber of an fJ lath kiln.

[Journal/k17) Technique: #I') For example, Chie〉, Ka-chu, K #v used in the heat storage chamber of a glass kiln are exposed to high temperatures in the presence of a food substance in an actual furnace. It will be done. J-, checker refractories are required to have corrosion resistance and hot strength.

Traditionally, when selecting materials for jinko and 2-car shochu, shochu (shochu) (
To evaluate the corrosion resistance and hot strength of a material, #corrosion+ti''
Then, the first totsubo method (Koyoruri food test), and for hot strength, a load softening test, a creep test, and a hot bending strength test were conducted, and these results were comprehensively judged.

[Problem to be solved by the invention]

However, since each of the previous tests was conducted in China and Germany, they do not accurately reproduce the situation in which 1F is exposed to high temperatures in the presence of refractories or 9 chloride + 1 substances in an actual furnace. , there was a risk of making a wrong judgment when selecting materials.

The present invention was made to solve the above problems, and it is possible to more accurately reproduce the conditions in which refractories are exposed in an actual furnace, and to make an optimal judgment when selecting the material for changer refractories. The purpose is to provide an evaluation test method.

[Means and actions to solve the problem]

The evaluation test force n of the checker refractory of the present invention is to form a crucible hole in the checker refractory [, add corrosive material, and place the improvement on the checker refractory under hot conditions. It is characterized by this.

According to this method, it is possible to accurately reproduce the situation where refractories or corrosive materials are exposed to high temperatures in an actual furnace, so it is important to ensure accuracy in selecting the material for the anchor refractories. I can do it.

In the present invention, +1 and 2 car refractories are tested as samples for a specified method. Further, the shape of the crucible hole is also set according to a predetermined method. However, if the shape of this crucible hole is too large, the refractory is likely to be destroyed regardless of the presence of corrosive substances, so the difference from the results obtained when only the load is applied will be small, and the accuracy will be less accurate. It becomes difficult to make decisions.

- On the other hand, if the shape of the crucible hole is too small, the influence of erosion by corrosive substances will be reduced, making it difficult to make accurate judgments. Therefore, the crucible hole has appropriate dimensions, such as a diameter of 30 to 45 ml+, a distance of 10 mm or more from the crucible hole to the edge of the sample, and a depth of 1/2 or less of the sample thickness. desirable. Note that the number of crucible holes is not particularly limited.

In addition, the edible substances that are put into the crucible hole include those that exist in the heat storage chamber of a crow kiln, and 5i0225%.
A compound with a certain degree is used. Note that in the heat storage chamber of a glass kiln, there is almost no excess 02, and the glass kiln is often operated in a reducing atmosphere that promotes corrosion of refractories. Therefore, by adding carbon to the corrosive substances described above to create a reducing PI atmosphere, it is possible to promote erosion around the crucible hole and more accurately reproduce the situation inside the actual furnace. can.

In the present invention, normally, 18 parts of the crucible hole formed in the sample of the checker refractory are covered with a corrosion-resistant refractory material against the corrosive substances introduced into the crucible hole, and a load is placed on the corrosion-resistant refractory material. These are placed in a test furnace and tested at a predetermined temperature. At this time, the bottom of the sample is supported by two supporting points, and a load is applied to the ten sides of the sample at two points at the ends of the corrosion-resistant refractory, so the applied surface load can be adjusted arbitrarily according to the four-point bending method. Can be set.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

Two types of magnesia bricks, A and B, were used for the second tier of the "chef car", and two types of chamotte bricks, C and D, were used for the lower tier of the "chef car" to determine whether or not they were suitable as large-sized changers in the following manner.

First, as shown in Figure 1, from the test refractories, @65■
, create sample 1 with a thickness of 35a+m and a length of 230cm,
Two crucible holes 2 each having a diameter of 30 m+++ and a depth of 15 mm were formed in the center thereof.

Next, as shown in FIG. 2, Na2SO475% was added as the corrosive substance 3 to the crucible hole 2 of this sample 1.

After adding the 5i0225% mixture, - of crucible hole 2
[One part is closed with a corrosion-resistant refractory 4, the sample l is supported by two fulcrums, and a predetermined load is applied to one part of the corrosion-resistant refractory 4; f f
Place the tl refractory 5 on the surface and set it in the test furnace in this state),
A master test was carried out by maintaining a predetermined temperature and a predetermined distance between the two surfaces at a temperature of 1-.

In Tables 1 and 2, the vent test examines the amount of bending caused by the synergistic effect of the reaction with the corrosive substance and the load. In addition, the crucible test investigates the reaction situation around the crucible hole. In addition, the creep test
This study examines the softening and deformation of refractories under load using conventional methods.

Surface load calculation formula (based on 4-point bending strength) - In the formula, σ is the set load, W is the surface load, L is the distance between the lower supports, and the text is the distance between the load points (corrosion resistance length of refractory 4)
, b is the width of the sample, and d is the thickness of the sample.

Here, σ is set to i by calculating the load applied from the 1L portion depending on the position where the checker brick is used in an actual furnace.

for example, Checker - For refractory test for L stage cr = 0.5kgf/cm2 For refractory test for middle stage of changer σ=1 kgf/cm2 Checker - lower tier refractory test σ=2 kgf, /ca+2 In 1), set the surface load etc. for testability.

15 test racks and test ties shown in Table 1 and Table 1;
Shown in Table 2.

From Tables 1 and 2, it can be seen that in the crucible test and creep test, the differences in properties between refractories are slight, but in the Be>F test, differences in properties between refractories clearly appear. A of magnesia bricks A and B are used for the checker 1st tier, and magnesia bricks C are used for the checker lower tier.
, D, C is suitable. These results were in good agreement with the actual use of each of the ten refractories in actual reactors.

〔Effect of the invention〕

As described in detail below, according to the method of the present invention, the situation in which a person is exposed in an actual reactor can be more accurately reproduced17.
Optimal judgment can be made when selecting materials for changer refractories, which is of great value to the T industry.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a large checker refractory sample prepared in an example of the present invention, and FIG. 2 is a side view showing a test method for the same checker refractory sample. DESCRIPTION OF SYMBOLS 1... Sample, 2... Crucible hole, 3... Eating material, 4... Corrosion-resistant refractory, 5... Refractory for front ball loading. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Claims] A test method for evaluating checkered refractories, which comprises forming a crucible hole in the checkered refractories, introducing an erosive substance into the checkered refractories, and applying a load to the checkered refractories while hot.