JPS58199770A - Blast furnace channel repairing material - 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 repair material with an inspection rate of 1 kdb for repairing the refractory lining of blast furnace gutters.

In recent years, the tapping capacity of the blast furnaces being built has increased year by year, and the tapping capacity has come to be done 10 to 14 times a day.
The tapping interval has been significantly shortened, and the conditions for using blast furnace troughs have become harsher. However, at present, there is no large-sized material for gutters that can withstand such harsh conditions.

Therefore, it is important to repair the refractory bricks used for the lining of the trough, or the monolithic refractories such as stamping materials, pouring materials, and vibration molding materials, when they melt and fall off due to repeated tapping.

Conventionally, the method of repairing the blast furnace gutter as described above was to first remove the residual iron and residue from inside the machine, and then repair the damaged parts of the gutter by spraying refractories. There is.

However, in the case of repair, such spraying not only requires equipment such as a mixer for refractory cross-connection and a spraying machine, but also requires the provision of personnel for each of these equipment (IIK workers). The number of workers will also increase.

Furthermore, not all of the sprayed refractories adhered to and solidified on the damage, and 30 to 509 g fell off as a rebound loss, resulting in extremely inefficient use of the refractories.

As a method to solve the above-mentioned problems, a method has been considered in which the damaged W6 is filled with a refractory material made into clay-like clay in advance, and the damaged W6 is rammed and repaired using a rammer or the like. However, when the refractory used in this method is used as a binder such as alelectronium phosphate, water glass, molasses, phenol resin, etc. to make it into a clay-like shape, the clay-like shape is Since refractories undergo deterioration over time, storage stability must be considered important, and the availability of raw materials to be used is also restricted.

That is, the conventional materials described above have problems in terms of thermal strength, corrosion resistance, etc., and are not satisfactory in terms of improving the life of the gutter.

As a result of various experiments and research, the present inventors found that metallic silicon, which is effective in improving hot strength and corrosion resistance, is highly reactive at room temperature, so it cannot be used as a clay-like material in its original state. Although it is impossible to use it due to storage stability, we have found that reactivity at room temperature can be suppressed by coating it with an organic binder. The gist of this invention is that it contains 1 to 10% by weight of metallic silicon coated with an organic binder.The present invention will be described in more detail below.

The particle size of the monometallic silicon used makes it easier to coat with an organic binder! Also, in consideration of uniform dispersion to damaged areas during construction, etc., it is preferable to have a mesh size of 100 mesh or less. In addition, the metal silicon of the above particle size is rolled and coated with an organic binder, which is highly reactive at room temperature, to suppress reactions over time during material storage.

The organic binder used in this coating is preferably one that is solid at room temperature and has a softening point of about 100° C., such as petroleum-based or coal-based pitch, phenol resin, or swelling charcoal, with petroleum-based pitch being particularly preferred.

Next, gold 4 coated with the above organic binder
The amount of silicon added is 1 to 10% by weight and 2 to 7% by weight.
Weight weight preferred. The reason for this is that the addition of metal silicon has no effect when the weight is less than 1 weight, and workability deteriorates when the weight exceeds 10 weight. ! 1. r, Autumn I with a porous body
This is because it adversely affects IK and physical properties.

The above-mentioned blast furnace gutter repair material according to the present invention has conventionally It has the following effects compared to other repair materials.

■8 Long-term storage of repair materials is possible.

■Excellent hot metal resistance and slag resistance.

■Excellent hot strength at high temperatures.

■ Good adhesion to old materials, improving gutter life.

Examples of the present invention will be described below.

The table below shows the mixing ratio of the present invention material and conventional repair material, and
Show its physical properties. All compounding ratios in the table below are by weight, and all samples for measuring physical properties were 50 Kv'
Nine pieces were pressure molded using ES. In addition, in the thread retention test, the material was stored in a plastic bag and the workability was examined after a certain number of days had elapsed.

Furthermore, corrosion resistance was tested using a rotating corrosion test method. That is, (blank space below) each compounded material shown in the table was set in a circular III-shaped rotary furnace, and heated and melted with a 2! Then, the furnace body was rotated and a certain amount of corrosive agent was added, and after replacing the corrosive agent by several IgI (10-1 in this example), the test specimen was taken out and the erosion thickness was measured. The erosion thickness per hour is shown.

As is clear from Table 9 above, this button-measuring material has a shelf life approximately 4.5 times longer than conventional materials, and its corrosion resistance is improved approximately twice as much.

In addition, when the present invention material was used, about 500% of long i! After repairing the damaged parts on both side walls of 10wn, diameter 200mm, depth 7520mm, the amount of iron passing was reduced by approximately 2.
0. It is possible to increase Q OQ t o *, and the basic unit of gutter material is also 0.05 K#/p, g,
It was difficult to lower the t.

It is clear that the repair material for blast furnace gutter according to Kanazhen (, book @ Ming) has higher resistance,
It has excellent tactility and storage stability, and results from actual furnaces have confirmed that it has beneficial effects in improving gutter life and reducing unit consumption and unit cost.

The present invention is not limited to a repair material for poles, but also exhibits excellent effects as a hole-forming material for a tap hole.

Patent Applicant: Sumitomo Metal Industries, Ltd. Daiko Furnace Co., Ltd. Procedural Amendment (0 button 1, Indication of case Patent Application No. 57-82151 2, Name of invention Blast Furnace Gutter Repair Material 3, Person making the amendment Case) Relationship with Applicant Address: 15-year-old ship, Kitahama 5, Higashi-ku, Osaka-shi, Osaka Prefecture (
211) Sumitomo Metal Industries, Ltd. (1 person'4)
, Agent 7, Contents of the amendment Contents of the amendment (1) 0 In the specification of the claimed invention, page 5, line 6, “...5
0 and 2;..." is changed to "...50h/imaginary・
-” and correct it.

(2), page 7, line 13 of the same book, ``...about 1 岨■
■ ton...” was changed to “...approximately 277 tons.”
n…” I corrected it.

that's all

Claims (1)

[Claims] (1) A repair material for blast furnace gutter in the form of clay, characterized by comprising 1 to 10 parts by weight of metal silicon coated with an organic binder, and the remainder being made of a heavy compound refractory material.