JPH02296625A - Packaging method for refractory containing free lime - Google Patents

Abstract

PURPOSE:To prevent the digestion of a refractory which contains free line assuredly by a method wherein the refractory which contains free lime is covered by an airproof material, and in addition, air in the cover of this airproof material is removed, and CO2 dry gas is encapsulated to complete the packaging of the refractory. CONSTITUTION:Refractories 1 are piled up on a lower box body 5, and a lid 6 is fitted, and then at the seam of a box body 4, an airproof tape 7 is bonded. By opening a vacuum valve 10, a vacuum pump 12 is operated, and the pressure in the box body 4 is reduced by aspiration to approximately 20-30mmHg. Then, the vacuum valve 10 is closed, and by opening a pressure valve 14, CO2 dry gas is fed from a bottle 16 up to a pressure which is slightly higher than the outside air pressure, i.e., approximately 0.1-2mmHg. Then, a three way pipe 8 is removed, and an opening 17 is closed by a tape or heat-sealing to give an airproof condition to the box body 4 by completely shutting out the box body 4 from the outside air. In this manner, the box body 4, which has been shut out from the outside air, and in which refractories objects are contained, is packaged by a shrinkable film 18 or tied by a steel belt 19 or PP band properly to complete the packaging.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for packaging refractories containing free lime, and in particular to a method for packaging refractories containing free lime that can be stored while effectively preventing the refractories from being digested for a long period of time. Regarding the method.

Conventional technology Refractory bricks, typified by dolomitic bricks containing free lime (Cab), are useful as lining materials for basic steelmaking furnaces or cement rotary kilns. The disadvantage is that the free lime contained in bricks absorbs moisture from the air and is easily digested, causing the brick structure to disintegrate, and that corrosion resistance deteriorates when stored and used for a long period of time.

In order to overcome this drawback, methods have been proposed in the past in which bricks are impregnated with or coated with tar pitch or the like.

However, these methods cannot sufficiently improve the fireproofing resistance of refractory bricks, and also increase equipment costs for impregnating equipment, fuel costs for heating before impregnation, etc., and impede productivity. Met.

Problems to be Solved by the Invention For this purpose, the applicant has developed a method of covering a refractory with an airtight material, exhausting the moist air within the airtight material coating, and filling it with dry gas such as dry air. and have obtained good results.

However, even with this method, the bricks are rigid and a lift or truck is often used to handle the bricks, so the airtight packaging material may tear and the fireproofing effect cannot be fully demonstrated. Sometimes. In addition, when refractories are stored for a long time, even if they are airtight, they have a slight moisture permeability, so they can be locally extinguished.
In some cases, the life of the lined furnace was shortened, and some had to be disposed of.

Digestion of refractory bricks containing such free lime involves the reaction of free lime (Cab) scattered in the refractory with moisture in the air to produce rheusium hydroxide (Ca(0)1).
z), and is an unavoidable phenomenon in Japan's hot and humid climate.

Means for Solving the Problems The present invention has been made in view of the above-mentioned problems.In order to solve the above-mentioned problems, a refractory containing free lime is coated with an airtight material, and the airtight material is coated with the airtight material. Exhaust the air inside C
To provide a method for packing refractories containing free lime, which is characterized in that the refractories are packed by sealing in O8 dry gas.

According to the present invention, by covering the refractory containing free lime with an airtight material, the refractory is isolated from the outside air, and absorption of moisture in the outside air can be prevented. In addition, by discharging the air inside the airtight material coating and filling it with CO□ dry gas, it is possible to reliably prevent the digestion of refractories containing free lime. The presence of free lime that gradually reacts with gases to form lucium carbonate (CaCOs) and reacts with moisture in the air, even if the sealing material is breached or used to expose these bricks to the air. Since this decreases, digestion of refractories containing free lime can be reliably prevented.

Example Hereinafter, the present invention will be explained based on examples.

FIG. 1 and subsequent figures show an embodiment of the present invention, in which refractories are packed using pallets. Refractories such as refractory bricks 1
As shown in Figures 1 and 2, a box body 4 made of square film is placed on a pallet 2 made of wood or the like with a polyethylene sheet, gas-impermeable airtight sheet made of aluminum vapor-deposited film, or corrugated paper 3. I try to stack them inside and pack them.

Like the corrugated paperboard 3, the box body 4 is made of an airtight material such as a gas-impermeable square film such as polyethylene, aluminum vapor-deposited film, aluminum foil film, etc. As shown in Fig. 2, the lid 6 is attached to the lower box 5 as shown in Fig.
It is formed so that it can be fitted. Then, the joint between the lower box body 5 and the lid body 6 is sealed by wrapping an airtight tape 7 such as aluminum foil tape or synthetic resin tape as shown in FIG. It can be completely blocked.

As shown in FIG. 1, a three-way pipe 8 is removably joined to the upper surface of the lid 6 of the box 4 constructed in this way at one end, and a negative connection port 9 of the three-way pipe 8 is connected to a vacuum. A vacuum pump 12 is connected via a valve 10 and a pressure gauge 11,
CO,
A cylinder 16 loaded with a dry gas of CO is connected, and the humid air inside the box body 4 is discharged so that a dry gas of CO□ can be filled.

The above packaging method involves stacking the refractories 1 on the lower box body 5 as shown in Figure 2, fitting the lid body 6, and applying airtight tape 7 to the joints of the box body 4 as shown in Figure 1. Join. Then, the vacuum valve 10 is opened to drive the vacuum pump 12, and the box 4
Vacuum the inside to about 20 to 30 degrees Hg. Then,
The vacuum valve 10 is closed, the pressure valve 14 is opened, and dry gas of CO□ is supplied from the cylinder 16 at a pressure slightly higher than the outside pressure of about 0.1 to ZaaHg. Then, the three-way pipe 8 is removed, and its opening 17 is closed with tape or heat sealing to completely isolate the box 4 from the outside air and make it airtight.

The box body 4 for storing refractories, which is isolated from the outside air in this way, is wrapped with a shrink film 18 as shown in FIG. 3, or appropriately bound with band iron 19 or PP hands.

In the method for packing refractories containing free lime according to this example,
In the past, items that could only be effectively stored for about 3 to 6 months,
- Can be stored effectively over long periods of time,
In addition, as a result of unpacking and examining the refractories, we found that lucium carbonate (
The formation of lucium carbonate (CaCOs) was observed.
It was confirmed that the refractory was protected by the formation of aCOs).

In the above embodiment, the refractory coating was bonded to the top and bottom, but it may be in the form of a bag, or it may be in the form of an airtight cardboard case instead of a film. It is.

Although the Cot drying gas was filled in by vacuum degassing, it can also be done by supplying an excess 002 drying gas.

In the above embodiments, the refractory was explained using a regular-shaped brick, but the present invention can be similarly applied to an irregularly-shaped powder refractory.

Effects of the Invention As described above, in the present invention, the refractory containing free lime is isolated from the outside air with an airtight material, and the refractory is packed with dry gas of CO, so free lime can be removed. The refractories it contains can be stored for long periods of time, and since free lime (Cab) and COt gas react during packaging to produce lucium carbonate (CaCO,), they can be stored in good quality and refractory materials can be removed from the packaging. Even if the materials are taken out and used, the generation of hydroxide (Ca (OH)

[Brief explanation of the drawing]

FIGS. 1 and 2 are perspective views for explaining the packaging of one embodiment of the present invention, and FIG. 3 is a perspective view of one embodiment of the same packaged state. DESCRIPTION OF SYMBOLS 1... Refractory, 4... Box body, 7... Airtight tape, 8... Three-way pipe, 12... Vacuum pump, 16...
...CO! Cylinder for dry gas. Applicant Kawasaki Rozai Co., Ltd. Agent Patent Attorney Kuniaki Morimoto

Claims (1)

[Claims] (1) Refractories containing free lime are covered with an airtight material, and the air inside the airtight material is exhausted and dry gas of CO_2 is filled in to pack the refractories. Packing methods for refractories including.