JPS6081073A - Lightweight refractory heat-insulating block - 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 novel lightweight fireproof insulation block.

Fireproof insulation materials, which are mainly used in heating furnaces and other equipment for the purpose of energy conservation by strengthening insulation, create pores and air layers within their structure to utilize air insulation to reduce thermal conductivity. Fireproof insulation bricks, ceramic fiber insulation materials, lightweight castable refractories, etc. are generally used. Among these, fireproof insulating bricks have drawbacks such as insufficient strength and a low operating temperature of about 1,600°C. Insulating materials made of ceramic fibers processed into blankets, felts, blocks, etc. are lightweight and have great insulation properties, but because the fibers used are amorphous, they crystallize over time and as the temperature rises. It has a major drawback that it precipitates and becomes coarse, loses its flexibility and turns into powder, or converges and cannot withstand long-term use at high places. Father, suburatu Vyu of hot metal etc., steel ingots,
The disadvantage is that scale, mineral dust, etc. adhere to the surface and cause deterioration, and if the flow inside the furnace is fast, the fibers on the surface are blown away and damaged. In addition, lightweight caster refractories contain lightweight aggregate and lime ((3nO)2), so they cannot withstand long-term use at high temperatures, are complicated to install, and require a large amount of moisture. Disadvantages include the need for a large amount of time and heat source for subsequent drying.

The present inventor has specified a fire-resistant insulation material that does not have the drawbacks mentioned above, that is, it is lightweight, has a high usage environment, has a light intensity of ta, and has little deterioration during use, and is stable for a long period of time. The rod-shaped or (and) string-shaped molded bodies are irregularly or (
and) We have developed a new block that is a sintered body that is regularly arranged and sintered into one group, and are currently applying for a separate application, but as a result of further research, we found that there is a partition wall inside the block. And (or) By providing an outer wall on the surface part, the present invention was completed based on the idea that the strength would be higher, and the deterioration during use would be less PK.
Rod-shaped or (and) a-shaped molded bodies containing a refractory raw material and a binder and having a cross-sectional diameter of 0.8 to 5 m are arranged irregularly or (and) regularly, and the refractory raw material 1
A lightweight refractory heat insulating block (hereinafter referred to as block A) in which a partition containing a refractory material and a binder is provided and sintered and integrated, the cross-sectional diameter of which is 0. Rod-shaped or (and) string-shaped molded bodies of 8 to 5 rum are arranged irregularly or (and) in an m-regular manner,
Furthermore, an outer wall containing a refractory raw material and a binder gold on the surface portion of the sintered body that is sintered and integrated, with or without a partition wall containing a refractory raw material provided therein? A lightweight fireproof insulation block (hereinafter referred to as block B) prepared by drying or firing, as well as a fireproof raw material and a binder? The diameter of the cross section is 0.3 to 5 mm.
The rod-shaped or (and) string-shaped molded bodies are arranged irregularly or (and) regularly, and a partition wall made of a refractory raw material is provided inside or without, and the surface thereof is Lightweight fireproof insulation block (all parts of which contain fireproof raw materials and binders) are sintered and integrated into all the outer walls.
(hereinafter referred to as block C).

The lightweight fireproof insulation block of the present invention is manufactured, for example, as follows.

First, a refractory raw material, a binder, water, etc. are mixed together and extruded into a rod or string shape using an extrusion molding machine or the like. The rod-shaped molded body may be obtained by suitably cutting a string-shaped molded body base or a completely dried or calcined product, or may be obtained by cutting a regular molded body into a rod shape. The cross section of the rod-shaped molded body or string-shaped molded body may be any shape such as circular, oval, square, rectangular, polygonal, etc., and may be hollow or hollow, but the diameter thereof is about 9.3-51ffn. It is difficult to say that.

Note that the diameter in the present invention is of course the diameter when the cross section is circular, but when the cross section is not circular, the diameter is calculated by the following formula:
rrm Technique 9 It is difficult to manufacture small blocks, and the structure of the block after firing becomes dense, reducing the cutting effect.For blocks larger than 5 mm, the structure of the fired charcoal becomes sparse. This is not preferable because the strength tends to decrease. Further, the rod-shaped molded body or string-shaped molded body may be linear or curved, or may be twisted. Rod-shaped and string-shaped are essentially continuous concepts, so in the present invention, the length of the rod-shaped molded product is not limited at all, but for convenience in handling, the length is usually 8 to 8. 8001
It is often about rIrr1.

The refractory raw material used in J: is not particularly limited, and may be acidic, neutral, or salt ai;a, such as alumina, mufito, Panshi shale, zircon, diVconia, spine V, magnesia, Examples include clay, dolomite, silica, chamotte, chromium, lime, etc.
Is one type or a combination of two or more of these suitable for the required usage conditions (e.g. usage temperature, required strength, reactivity with FIIl hot material in the furnace wall, etc.)? Select and use.

Carbon, silicon carbide, nitride, etc. may all be used together as refractory raw materials. These refractory raw materials are usually ff1K, so the particle size is -
Prepare and use. Further, the binder is not particularly limited, and for example, methylse! Organic materials such as Rerose, polyvinyl alcohol, dextrin, Likuninsu A sodium phonate, pitch, Tar M, resin, sodium silicate,
Examples include inorganic materials such as potassium silicate, aluminum phosphate, and magnesium phosphate, and at least 41 of these are used.

One bundle of refractory raw material and binder is kneaded according to a conventional method, adding water etc. if necessary, and then formed into a rod or string as described above.

Next, when producing the block At, the rod-shaped molded product or (and) the string-shaped molded product obtained in Section L? , in its raw form or by drying or calcining it.

The slurry containing a refractory raw material is filled into a molding frame made of refractory material, etc. (slurry in this specification also includes a slurry with a low water content in the form of a cross-wire proboscis). (and) Fill horizontally in the form of bulkheads.

The partition wall may be provided only at - location, or may be provided at multiple locations. Further, the thickness of the partition wall is not particularly limited and is arbitrary, but it is usually about 1 to 15 nm in many cases. Next, the temperature is usually 1000-2000°C, preferably 1860-2000°C.
They are baked and integrated at a temperature of 19110°C.

Okuki slurry is obtained by completely mixing refractory raw materials, binder, water, etc. Incidentally, as the slurry for partition walls, binder Kanakura % can be used.

As the refractory raw materials and binders, are those listed as the raw materials for the rod-shaped or string-shaped molded bodies? Both can be used, but
In addition to the above-mentioned refractory raw materials, materials having heat insulating properties such as hollow grains such as Bubble 7M Mina, lightweight Nyamot, and pearlite can also be suitably used. In addition to the above binders, alumina cement, portland cement, etc. can also be suitably used. The water content of the slurry is
There are no particular limitations on the method of filling the slurry, which should be adjusted as appropriate depending on the method of filling the slurry and the use of the block. After arranging a large number of pipes in a line that can introduce slurry for partition walls into the area to be installed, a rod-shaped molded body or (and) a string-shaped molded body is placed in a molding frame. You can fill the pipe, then pull out the pipe and introduce (press-fit if necessary) the gas slurry to fill it and create a partition wall, or (b)
In (a), instead of arranging the pipes, two partitions, such as iron plates, are inserted into the molding frame at intervals according to the thickness of the partition wall, and the same partition wall is used. (c) (b) or (b)
In this case, is it possible to fill the rod-shaped compact or (and) string-shaped compact and introduce and fill the slurry into the partition wall at the same time? (2) If the height of the forming frame is low, the shape of the part where the partition wall is to be provided after filling the rod-shaped molded body or (and) the string-shaped formed body into the forming frame may be changed. Is it a partition wall made by press-filling slurry? (e) A mixture of a rod-shaped molded body or (and) a string-shaped molded body and slurry is filled in the part of the molding frame where the partition wall gold film is to be applied, and a rod-shaped molded body is filled in the pond area. The space mt may be provided by filling the molded body or (and) string-like molded body. In addition, when providing a water wall, for example, a rod-shaped molded body or (and) a string-shaped molded body up to a certain height of the molding frame? After filling, a certain amount of slurry is filled while moving the entire pipe or slit through which the slurry can be introduced from above, and then the rod-shaped compact or (and) string-shaped compact is filled by force to provide a partition wall. Good. When providing both vertical partition walls and horizontal partition walls, the above-mentioned methods are appropriately combined.

In the present invention, when filling a molding frame with rod-shaped molded bodies and/or string-shaped molded bodies, they are arranged irregularly or (and) regularly. At this time, if necessary, it may be vibrated completely, or it may be pressed with appropriate pressure after filling. Here, is it a rod-shaped or (and) string-shaped molded body? Irregularly or (and) regularly arranged means, for example, (1)
Rod-shaped molded bodies of fixed or various shapes (length, cross-sectional shape, diameter, etc.) may be arranged in an irregularly intertwined state, or (2) rod-shaped molded bodies of a fixed shape may be arranged. Irregularly entangled layers and one or more layers of irregularly entangled rod-shaped bodies with different shapes alternate or consecutively in the order of the shape (e.g. length) of the rod-shaped bodies (3) A layer in which rod-shaped molded bodies of a fixed or various shapes are arranged in a fixed direction and a layer arranged in a different direction (for example, at right angles). The layers may be alternately overlapped and arranged in a t-state, or (4) a rod-shaped molded body of a constant or various shapes and a string-shaped molded body of a constant or various shapes are irregularly entangled. (5) string-like molded bodies of a fixed or various shapes may be arranged in an irregularly or regularly folded state; j6) fixed or various shapes A layer in which cord-like molded bodies of different shapes are folded irregularly or regularly and a layer in which rod-shaped molded bodies of fixed or various shapes are irregularly intertwined or regularly arranged are arranged alternately. This shows that it is possible to arrange them in a V-shaped state.

In addition, the firing after filling the rod-shaped molded body or (and) string-shaped molded body with the partition wall slurry 7 may be carried out by filling the molding frame and leaving it at t, or by taking it out from the molding frame η. It's okay. The firing temperature is determined by taking into account the composition of the raw materials used and various properties such as the strength required for the block after firing.
In addition, in order to maintain stability without hardening of quality or shrinkage of tissue during use as a heat-insulating Glock, all temperatures within the above range are selected to be approximately equal to or higher than the operating temperature. The firing time may also be determined as appropriate. The molding frame used in Mayu can be of any shape, such as rectangular parallelepiped (plate-shaped Kanakuramu), cube, of course, but also prismatic, cylindrical, cylindrical, one sphere, etc.

Alternatively, any of these T-combined irregularly shaped blocks can be manufactured depending on the purpose of use.

The above-mentioned specific rod-shaped or (and) string-shaped thorns
Zeta A (Un W Ull V V ?P t J&B
)4! t4 dll'+￥a ri7 a4 yll
Block A of the present invention, which is a sintered body in which the filling layer and the partition wall filling layer are sintered together, is obtained.

Next, when manufacturing 7" lock B2, the block A itself obtained in the following, or the block obtained by firing the block A without providing a partition wall, that is, a rod-shaped or (and) a-shaped molded body. Sintered irregularly or (and) regularly arranged.

A slurry made by using any of the blocks that have been converted into - and containing a refractory raw material and a binder on the surface of the block?
The outer wall is coated with gold, dried or fired. As the slurry for the outer walls, the same slurry as the slurry for the partition walls is used. The method of providing the outer wall is not particularly limited, and methods such as painting, spraying, and impregnation may be employed. The thickness of the outer wall is the same as that of the partition wall. Block B has sufficient strength even if it is dried after installing the outer wall, but
It may be rounded to further increase the strength. Dried tea juice is usually 1
The firing conditions are the same as those for block A, at a temperature of about 00 to 300° C. for about 12 to 48 hours.

Thus, block A or bulkhead in block A? Is there an outer wall on the surface of the block that does not spawn? A dried or fired block B of the present invention is obtained.

Next, when manufacturing a block at, the block A
In manufacturing, only a filling layer in which rod-shaped or (and) string-shaped molded bodies are arranged irregularly or (and) regularly is provided, or this filling layer and a partition filling layer are provided together, and then the forming frame is Before firing, an outer wall is provided in the same manner as in the case of block B, and firing is performed. The firing conditions are the same as those for block A.

In this way, a block C is obtained in which the block A before firing or the block C in which an outer wall is further provided on the surface portion of the block in which no partition wall is attached.

The light Ti fire-resistant insulation block of the present invention has a novel structure not previously known, in which the specific rod-shaped or (and) string-shaped molded bodies are arranged irregularly or (and) regularly. Both the partition wall and (and) the outer wall part are sintered (dry) and turned into -, and there are many voids in the structure. It is lightweight, has excellent heat insulation properties, and has a strength comparable to that of light. In addition, the refractory raw materials to be used, the length of the rod-shaped compacts and/or string-shaped compacts, the cross-sectional shape and diameter, the arrangement method, the firing temperature, the slurry filling method, the drying or firing temperature after filling, etc. It is a good idea to select and combine products with high strength (you can also specify the strength of specific parts), low bulk specific gravity, low thermal conductivity, low reheating shrinkage rate, and high maximum operating temperature. , can be appropriately prepared depending on the purpose of use. In particular, by providing a partition wall or (and) an outer wall, gas convection within the block is reduced, the insulation effect is increased, and the strength is increased. , scale V, contamination and deterioration due to dust, etc. can be reduced. Further, as described above, various shapes can be manufactured. Therefore, it is easy to construct, and even in crystals, there is little deterioration during use, and it is stable for a long period of time.11 of the present invention! The refractory insulation block can be suitably used as a refractory insulation material for various types of molten metal retention covers such as tunnel bars, ladles, various gutter covers, heating furnaces, soaking furnaces, electric furnaces, etc. It can also be suitably used as fireproof walls, heat shields, anchor bricks, etc.

Examples of the present invention are listed below. Let me explain in more detail.

Example 1 40 parts of amine material raw material and 60 parts of chamot material material were added to AV Mina 70 and Silica 28M14.
After kneading the particle size-adjusted 7 pieces consisting of porridge with 80 parts by weight of a liquid binder (methylse M loin 15 weight T4 aqueous solution), it was put into an extrusion molding machine, and the cross section was 1 m in diameter.
A rod-shaped molded product Shikaku having a circular shape of m and a length of lO to 120n]fn was obtained. This was assembled into a molding frame with a firing cart (high-A M
Mina brick Vil - combination 7t400 x 400
When filled in a 100 x 100 (1111n) and fired in a Tonki kiln at a maximum temperature of 1600°C for 6 hours, the individual rod-shaped molded bodies were irregularly entangled and sintered to form an integrated sintered body. Obtained.

Next, on the surface part of this sintered body, grain size 21TIrr1
The following Bab V Amina 60 weight ratio and particle size Q, 15mm
Refractory raw material 1 consisting of the following high aluminium fine powder in an amount of 40 min.
Approximately Brr
After applying the coating to a thickness of m, it was dried at 170° C. for 24 hours to obtain a lightweight fireproof and heat insulating block Bi of the present invention.

Example 2 In the same molding frame as in Example 1, a large number of partition wall forming pipes were arranged in a cross shape at intervals of 200 m. The rod-shaped molded body used in Example 1 was filled into this molding frame in the same manner as in the actual side 1.

Next, from the atomized pipe, 100 parts by weight of a refractory raw material consisting of 65 parts by weight of alumina chamotte with a particle size of 2.5 μm or less, 80 parts by weight of high alumina fine powder with a particle size of Q, 15 μm or less, and 5 parts by weight of kaolin clay were added. Slurry gold for bulkheads is prepared by adding 17 parts by weight of water to 100 parts by weight.
A partition wall with a thickness of m was provided.

This was fired in a Tunne V kiln at a maximum temperature of 1600°C for 6 hours, and the rod-shaped molded bodies were irregularly intertwined and the nine parts and the partition wall part were sintered together and integrated into the lightweight fireproof insulation block AI of the present invention. Obtained.

Next, an outer wall was provided to the block obtained in Example 1 in the same manner as in Example 1, and the structure of this block will be described with reference to the drawings. In the vg1 diagram, (1) is the part t-12) where the rod-shaped bodies are irregularly intertwined and fired, and (3) is the part t-12) on the dried outer wall 1.
indicates fired bulkhead gold.

The characteristics ri of each block obtained in Examples 1 and 2 are shown in Table 1. For comparison, examples of commercially available products (A: manufactured by A Company, Ceramic Fiber Feyto, manufactured by BHA Company, high temperature fireproof insulation bricks; C: manufactured by Company A, ultra-light fireproof insulation bricks) are shown in Table 1. Also written t. According to Table 1, the lightweight fireproof insulation block of the present invention has a higher maximum usage @ than A, A, B,
0, the reheating shrinkage rate is small compared to both B and c.
It is clear that it is as lightweight as B and (3), that it has higher strength than B and (3), and that it has lower thermal conductivity than B and C, and has the best overall performance as a fire-resistant insulation material. I understand that.

[Brief explanation of drawings]

Fig. 1 shows a partially cutaway perspective view of the lightweight fireproof heat insulating splitter of the present invention obtained in Example 2.
2)...Outer wall part% (3)...Partition wall part. (or more) ,,":'F,"shi,

Claims (1)

[Claims] ■ A rod-shaped or (and) string-shaped molded body made of a refractory raw material and a binder and having a cross-sectional diameter of 0.3 to 5 mm is arranged irregularly or (and) regularly. Arranged and further refractory raw materials? A 1-piece fireproof insulation block with a bulkhead made of sintered wood and a sintered wood. ■ Contains a fireproof raw material and a binder, and its cross-sectional diameter is 0.3cm. Rod-shaped or (and) string-shaped molded bodies of ~5 mm are arranged irregularly or (and) regularly, and a partition wall made of fireproof raw material is provided or not provided inside, A lightweight fireproof and insulating block made by drying or firing the outer wall made of refractory raw materials and a binder containing horn on the surface of an integrated sintered body. ■ Includes refractory raw materials and pinter. Rod-shaped or (and) string-shaped molded bodies with a cross-sectional diameter of 0.3 to 5 mm are arranged irregularly or (and) regularly, and a partition wall containing a refractory raw material is arranged between the rod-shaped and/or string-shaped molded bodies. A lightweight fireproof heat insulating block which is sintered and integrated with an outer wall completely containing a fireproof raw material and an inder on the surface thereof, with or without being provided inside.