KR20170129548A - Fireproof fiber, method for manufacturing of the same, and method for manufacturing of insulating materials using the same - Google Patents

Abstract

The present invention relates to a fireproof fiber, a method for manufacturing the same and a method for manufacturing insulating materials. The fireproof fiber comprises 20 to 50 wt% of CaO, 5 to 25 wt% of Al_2O_3 and residual SiO_2 and other inevitable impurities with respect to total 100 wt% of the fireproof fiber. The average diameter of the fireproof fiber is 5 to 10 m. According to an embodiment of the present invention, provided is a method for manufacturing a fireproof fiber capable of improving price competitiveness. Also, a fireproof fiber can be manufactured in an easy manner by controlling the pressure and flux of gas.

Description

FIELD OF THE INVENTION The present invention relates to a refractory fiber, a refractory fiber, a method of manufacturing the refractory fiber, and a method of manufacturing a heat insulating material using the refractory fiber,

The present invention relates to a refractory fiber, a method of manufacturing the same, and a method of manufacturing a heat insulating material using the same.

The most common cause of deaths in the case of fire in buildings is suffocation due to toxic gas. Particularly, when urethane-based organic insulation material commonly used is burned, strong explosion and poisonous gas are generated, resulting in a great loss of life. The price is cheap and easy to handle. The proportion of domestic organic insulation material is close to 80%. Therefore, it is widely believed that the use of organic insulation materials, which are vulnerable to fire, should not be neglected due to the reduction of construction cost. In the construction industry, there is no fear of combustion compared to polyurethane or polystyrene, and therefore there is an advantage that the problem of CO gas generation in a fire can be solved. In addition, it is made of non-inhaled fiber which is excellent in heat insulation, thick particle and difficult to suck in human body. Even if it is inhaled, it is safe in coffee group 3 and its health stability is recognized in International Cancer Research Institute (IARC).

On the other hand, the slag generated in the steelmaking and steelmaking process is 17 million tons per year, mostly used as cement and coating materials. Studies for high value addition of such slag have been going on, and production of mineral wool using blast furnace slag has been recognized as a high value added technology. Mineral wool has a market size of about 6 trillion won as of 2012 and is expected to grow very much in recent years due to plant construction and shipbuilding growth in developing countries in the Asia / Pacific region. In addition, since the range of operating temperature is wide and it is produced in various forms according to various applications, it can be used as an economical insulation material necessary for industrial buildings, shipbuilding industry as well as all buildings that require insulation, cold insulation, insulation, fireproofing, Be in the spotlight.

At present, the method of producing mineral wool is to melt calcium silicate ore at high temperature, and then spinning spinner having several holes is sprayed with high-speed rotary force to feed the raw material and fiberized by high-temperature gas jet stream, To form a uniform shape. In other words, the fiber is produced by dissolving at high temperature and rotation. The most commonly used technique is a Rapidly Centrifugal Spinning Process, which is applied to a rotating injector rotating the molten steel and is thrown horizontally by the centrifugal force Loses. At this point, the air jets pile up the fibers as they are made, causing the fibers to fall vertically. It uses slag and waste materials, but it has difficulty in carrying and re-melting. In addition, because it uses the high-speed spinning method, it controls the rotating speed or the process condition, and therefore, it is more expensive than other insulating materials, and has a great influence on the physical properties of the fibers. In addition, since the slag is cooled and moved to be used in the high-speed rotary centrifugal method, the heat of the remelted molten steel is a major factor in the increase of the cost. There is a need for a new process for the production of mineral wool which can reduce the heat energy used for slag melting during fiber production and efficiently recover waste heat generated after fiber production, thereby meeting both the high value added cost of slag and the recovery of waste heat. It is desired to improve the thermal insulation property by making it easier to control the fiber thickness in the production of mineral wool. In order to improve the economical efficiency, it is essential to design the fiber manufacturing process which occupies a large portion of the manufacturing cost.

Refractory fibers, a method of manufacturing the same, and a method of manufacturing a heat insulating material using the same.

The refractory fiber according to one embodiment of the present invention is a refractory fiber comprising 20 to 50 wt% of CaO, 5 to 25 wt% of Al ₂ O ₃ , 100 wt% of SiO ₂ and other unavoidable impurities, And the average total length of the refractory fibers is 100 to 10,000 mu m.

The refractory fibers may have an average diameter of 5 to 10 mu m.

The average total length of the refractory fiber may be 200 to 500 mu m. More specifically, the average total length of the refractory fiber may be 300 to 500 mu m.

The refractory fiber may be in the form of a cylinder.

The method for manufacturing refractory fiber according to another embodiment of the present invention includes the steps of: melting molten slag generated in a steelmaking and steelmaking process and transferring the melted slag to a tundish; Spraying the molten slag transferred to the tundish into the first chamber through a nozzle at the bottom of the tundish; And spraying a gas to the molten slag injected into the first chamber to produce a fiber.

More specifically, the method includes spraying a gas to the molten slag injected into the first chamber to produce a fiber; Thereafter, recovering sensible heat from the fibers may be further included.

Spraying a gas onto the molten slag injected into the first chamber to produce a fiber; The gas may be air, argon (Ar), nitrogen (N ₂ ), hydrogen (H ₂ ), or a combination thereof.

More specifically, the pressure of the gas may be from 5 to 40 bar.

More specifically, the flow rate of the gas may be from 3 to 100 Nm ³ / min.

Spraying the molten slag transferred to the tundish into the first chamber through a nozzle at the bottom of the tundish, spraying the molten slag into the first chamber, and the first chamber not rotating .

The molten slag is melted in a temperature range of 1300 to 1650 ° C in a melting and slag producing process in a steelmaking and steelmaking process and transferring the molten slag to a tundish.

More specifically, an oxide may be further added to the molten slag.

Still more specifically, the oxide may be _{SiO 2, Al 2 O 3,} Na 2 O , or a combination thereof.

The molten slag may be a blast furnace slag, a converter slag, or a combination thereof, in which the molten slag generated in the milling and steelmaking process is melted and transferred to the tundish.

Recovering sensible heat from the fibers, comprising: transferring and laminating the fibers through the lower end of the first chamber to the second chamber; And recovering sensible heat from the fibers deposited in the second chamber.

Recovering sensible heat from the fibers may be to cool the fibers and recover heat from the cooled fibers.

And recovering the sensible heat from the fibers.

And recovering the sensible heat from the fibers, the recovered heat energy can be reused.

According to another embodiment of the present invention, there is provided a method of manufacturing a heat insulating material using refractory fibers, the method including: melting a molten slag generated in a steelmaking and steelmaking process and transferring the melted slag to a tundish;

Spraying the molten slag transferred to the tundish into the first chamber through a nozzle at the bottom of the tundish; Spraying a gas onto the molten slag injected into the first chamber to produce a fiber; Mixing the fiber with the binder; And a step of pressurizing and molding the fiber in which the binder is mixed to produce a heat insulating material.

Spraying a gas onto the molten slag injected into the first chamber to produce a fiber; Thereafter, recovering sensible heat from the fibers may be further included.

In the step of mixing the binder with the fiber produced, the binder may include an inorganic binder.

In the step of mixing a binder with the fiber produced, the binder may include calcium sulfate, sodium silicate, alumina silicate, calcium silicate, or a combination thereof.

The binder may be added in an amount of more than 0 parts by weight and less than 5 parts by weight based on 100 parts by weight of the fiber.

According to one embodiment of the present invention, an efficient high-value-added process can be presented using slag generated in a steelworks. Also, the present invention provides a manufacturing method of refractory fiber capable of improving price competitiveness by suggesting a process of simultaneously performing waste heat recovery. In addition, it is possible to easily produce long fibers by controlling the pressure and flow rate of gas without using a high-speed rotation process.

Another embodiment of the present invention is to provide a method of producing an amorphous amorphous form that is excellent in heat insulation and can produce uniform fibers and is harmless to human body. In addition, it is possible to provide a heat insulating material excellent in heat insulating function by using the above-mentioned fibers.

1 is a view showing a gas injection device according to an embodiment of the present invention.
2 shows a blast furnace slag used in another embodiment of the present invention.
3 shows refractory fibers produced by another embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. However, it is to be understood that the present invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It is intended that the disclosure of the present invention be limited only by the terms of the appended claims. Like reference numerals refer to like elements throughout the specification.

Thus, in some embodiments, well-known techniques are not specifically described to avoid an undesirable interpretation of the present invention. Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs. Whenever a component is referred to as "including" an element throughout the specification, it is to be understood that the element may include other elements, not the exclusion of any other element, unless the context clearly dictates otherwise. Also, singular forms include plural forms unless the context clearly dictates otherwise.

The refractory fiber according to one embodiment of the present invention comprises 30 to 60% by weight of SiO ₂ , 20 to 50% by weight of CaO, 5 to 25% by weight of Al ₂ O ₃ , % ≪ / RTI > and other unavoidable impurities.

The average diameter of the refractory fiber may be 5 to 10 mu m.

More specifically, when the average diameter of the refractory fiber is 5 to 10 mu m, the human body inhaling rate can be reduced because the particles are thicker than the organic insulator. Further, the refractory fiber of the above diameter can secure physical properties exceeding the heat insulating performance of 0.042 W / mK at 70 캜 based on the existing insulating plate No. 2 (KS L9102 standard).

The average total length of the refractory fibers may be 100 to 10,000 mu m. More specifically, the average total length of the refractory fiber may be 200 to 500 mu m. More specifically, the average total length of the refractory fibers may be 300 to 500 mu m.

More specifically, when the average overall length of the refractory fiber is in the above-mentioned range, it may be possible to produce a finer material having a thinner thickness than the existing insulating material. Further, even when the refractory fiber of the same thickness is produced, it is possible to provide a fiber having a low thermal conductivity and a better warmth. From this, the present invention can provide a long fiber excellent in thickness and heat insulation.

The method for manufacturing refractory fiber according to another embodiment of the present invention includes the steps of: melting molten slag generated in a steelmaking and steelmaking process and transferring the melted slag to a tundish; Spraying the molten slag transferred to the tundish into the first chamber through a nozzle at the bottom of the tundish; And spraying a gas to the molten slag injected into the first chamber to produce a fiber.

Spraying a gas onto the molten slag injected into the first chamber to produce a fiber; Thereafter, recovering sensible heat from the fibers may be further included.

First, the molten slag generated in the steelmaking and steelmaking process is melted and transferred to the tundish.

More specifically, the molten slag can be melted in a temperature range of 1300 to 1650 ° C. When the slag is melted in the above temperature range, refractory fiber producing conditions can be optimized in a sufficient molten state. In addition, in the case of melting exceeding 1650 占 폚, the cost cost for melting the slag may increase.

Further, an oxide may be further added to the molten slag. At this time, the oxide may be _{SiO 2, Al 2 O 3,} Na 2 O , or a combination thereof. However, the present invention is not limited thereto, and any oxide which can increase the viscosity of the slag and lower the basicity is possible.

More specifically, by adding the above-mentioned oxide to the molten slag, the viscosity of the slag can be increased and the effect of producing the long fiber can be expected.

The molten slag may include, but is not limited to, blast furnace slag, converter slag, or a combination thereof.

Thereafter, the molten slag transferred to the tundish may be injected into the first chamber through the nozzle at the lower end of the tundish.

At this time, the first chamber may be a chamber that does not rotate. Also, the melted slag injected by the above step can be injected into the chamber which does not rotate. More specifically, since the present invention uses the first chamber that does not rotate, it may not be a step of manufacturing fibers by a centrifugal separation method.

On the other hand, in the following step, the molten slag falling into the chamber is injected with gas, and the molten slag can be made into a fibrous material by the impact caused by the pressure of the gas.

Thereafter, a step of spraying a gas onto the molten slag injected into the first chamber to produce fibers may be performed.

More specifically, the type of gas injected into the molten slag may be air, argon (Ar), nitrogen (N ₂ ), hydrogen (H ₂ ) or a combination thereof.

By using the gas of this kind, the cost can be effectively reduced.

More specifically, the pressure of the gas may be between 5 and 40 bar.

By controlling the injection gas pressure as described above and injecting it, it is possible to produce refractory fibers of desired diameter and length.

Further, the gas may be injected at a flow rate of 3 to 100 Nm ³ / min. When injected at the above-mentioned flow rate, fibers of the desired diameter and length can be obtained. However, the present invention is not limited thereto, and the diameter of the fibers may vary depending on the diameter of the nozzle, the injection pressure of the gas, and the kind of the injected gas.

Thereafter, recovering sensible heat from the fibers may be carried out.

More specifically, recovering sensible heat from the fibers comprises: transferring and laminating the fibers through a lower end of the first chamber to a second chamber; And

And recovering sensible heat from the fibers deposited in the second chamber.

More specifically, recovering sensible heat from the fibers may be by cooling the fibers and recovering heat generated from the cooled fibers.

At this time, the step of recovering sensible heat from the fibers can collect heat energy of 200 ° C or more.

The collected and recovered heat energy can then be reused.

As described above, the sensible heat contained in the slag can be efficiently recovered to save energy, and high value-added can be easily achieved through fiberization of the molten slag.

In another aspect of the present invention, there is provided a method of manufacturing a heat insulating material using refractory fibers, the method comprising: melting a molten slag generated in a steelmaking and steelmaking process and transferring the melted slag to a tundish; Spraying the molten slag transferred to the tundish into the first chamber through a nozzle at the bottom of the tundish; Spraying a gas onto the molten slag injected into the first chamber to produce a fiber; Mixing the fiber with the binder; And a step of pressurizing and molding the fiber in which the binder is mixed to produce a heat insulating material.

First, the molten slag generated in the steelmaking and steelmaking process is melted and transferred to the tundish; Spraying the molten slag transferred to the tundish into the first chamber through a nozzle at the bottom of the tundish; The step of spraying the gas onto the molten slag injected into the first chamber to produce the fiber is the same as the method and the manufacturing method of the refractory fiber described above, and thus a detailed description thereof will be omitted.

Mixing the binder with the fiber; And a step of pressurizing and molding the fibers mixed with the binder to produce a heat insulating material. More specifically, in the step of mixing a binder with the fiber produced, the binder may include an inorganic binder. More specifically, the binder may be selected from the group consisting of calcium sulfate, sodium silicate, alumina silicate, calcium silicate, As shown in FIG. However, the present invention is not limited thereto.

The binder may be added in an amount of more than 0 parts by weight and not more than 5 parts by weight based on 100 parts by weight of the fiberized slag. When the binder is added by the above-mentioned weight, molding into the heat insulating material using the produced fibers can be facilitated.

Thereafter, a step of pressurizing and molding the fibers mixed with the binder to produce a heat insulating material may be carried out. A heat insulating material can be produced by applying a predetermined pressure to the fiber in which the binder is mixed to form the fiber.

In addition, the above-mentioned heat insulating material is made of the above-mentioned refractory fiber, and may be the one resulting from the above-mentioned refractory fiber of the heat insulating property of the heat insulating material. From this, it is possible to provide a heat insulating material excellent in heat insulating performance.

Example

SiO ₂ oxide was further added to the blast furnace slag produced as a by-product in the milling process, and the slag was melted at 1550 ° C to form a liquid phase, which was then transferred to a tundish. The molten slag transferred to the tundish was injected into the first chamber through the nozzle at the bottom of the tundish. A gas was sprayed onto the molten slag injected into the first chamber to produce a fiber. At this time, the flow rate of the gas was 15 Nm ³ / min. In addition, air was used as the kind of gas, and the pressure of the gas was 17 bar.

Thereafter, the fabricated fibers were transferred to the second chamber through the lower end of the first chamber and stacked. Thereafter, the sensible heat contained in the laminated fibers was recovered.

On the other hand, the fibers of Comparative Example were fabricated under the same conditions as in the present Example except that the fiber was formed by a high-speed spinning centrifuge method.

division Melting temperature of slag
(° C) Gas injection flow rate
(Nm ³ / min) Types of gas Gas pressure
(bar) Average diameter of fiber
(탆) Fiber
total length
(탆) Temperature difference of fiber
(° C) Insulation function Example 1 1550 18 N2 17 6.3 413 279 possible Example 2 1550 15 N2 17 8.5 324 284 possible Comparative Example 1
(High-speed spinning centrifuge method) 1550 - - - 5-7 40-100 - possible

As described above, the possibility of fiberization of slag was confirmed through the refractory fibers produced by the comparative examples and the examples. However, it can be seen that the length of the fiber of the present example manufactured through gas injection is better than that of the comparative example manufactured by the high-speed rotation separation method. More specifically, it was confirmed that the present example can produce fibers without using a centrifugal separation method. In addition, long-fiber refractory fibers could be produced by injecting gas into molten slag falling into a non-rotating chamber.

Accordingly, through the above-described embodiments, it has been confirmed that the present invention can produce refractory fibers excellent in heat insulation function of long fibers by using a process which is very effective in terms of cost reduction.

In addition, sensible heat can be recovered from the fibers. More specifically, the fibers can be cooled and heat generated from the cooled fibers can be recovered.

More specifically, it was confirmed that the temperature difference of the fiber cooled by the step of recovering the temperature of the fiber and the sensible heat before recovering the sensible heat was 200 ° C or more, and the heat generated therefrom could be recovered. On the other hand, as in Comparative Example 1, when the high-speed rotary centrifugal method, which is a slag heat recovery method actually practiced by Jimans, is used, the chamber wall is maintained in a water-cooling state, so that heat recovery is inferior to the present embodiment. On the other hand, it can be seen that efficient heat recovery is possible in manufacturing refractory fibers by the method according to the present embodiment.

2 shows a blast furnace slag used in another embodiment of the present invention. 3 shows refractory fibers produced by another embodiment of the present invention.

As shown in FIGS. 2 and 3, it can be confirmed that refractory fiber can be produced by using blast furnace slag.

From this, it is possible to produce a heat insulating material by mixing the produced fiber with a binder and then molding.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand.

It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be interpreted as being included in the scope of the present invention .

Claims (23)

Wherein the refractory fiber comprises 20 to 50% by weight of CaO, 5 to 25% by weight of Al ₂ O ₃ , the balance SiO ₂ and other unavoidable impurities with respect to 100% by weight of the entire refractory fiber,
Wherein the average total length of the refractory fibers is 100 to 10,000 mu m.
The method according to claim 1,
Wherein the refractory fibers have an average diameter of 5 to 10 占 퐉.
3. The method of claim 2,
Wherein the average total length of the refractory fibers is 200 to 500 mu m.
The method of claim 3,
Wherein the average total length of the refractory fibers is 300 to 500 mu m.
5. The method of claim 4,
Wherein the refractory fiber is in the form of a cylinder.
Melting and transferring the molten slag generated in the steelmaking and steelmaking processes to the tundish;
Spraying the molten slag transferred to the tundish into the first chamber through a nozzle at the bottom of the tundish;
Spraying a gas onto the molten slag injected into the first chamber to produce a fiber,
Spraying a gas onto the molten slag injected into the first chamber to produce a fiber; Since the,
And recovering sensible heat from the fibers. ≪ Desc / Clms Page number 19 >
The method according to claim 6,
Spraying a gas onto the molten slag injected into the first chamber to produce a fiber; in,
Wherein the type of the gas is air, argon (Ar), nitrogen (N ₂ ), hydrogen (H ₂ ) or a combination thereof.
8. The method of claim 7,
Spraying a gas onto the molten slag injected into the first chamber to produce a fiber; in,
Wherein the pressure of the gas is 5 to 40 bar.
9. The method of claim 8,
Spraying a gas onto the molten slag injected into the first chamber to produce a fiber,
The method of producing a fire-resistant fiber flow rate of the gas is from 3 to 100 Nm ³ / min.
The method according to claim 6,
Spraying the molten slag transferred to the tundish into the first chamber through a nozzle at the bottom of the tundish,
Spraying said molten slag into said first chamber,
Wherein the first chamber does not rotate.
The method according to claim 6,
Melting and transferring molten slag generated in a steelmaking and steelmaking process to a tundish,
Wherein the molten slag is melted in a temperature range of 1300 to 1650 캜.
12. The method of claim 11,
Melting and transferring molten slag generated in a steelmaking and steelmaking process to a tundish,
Wherein an oxide is further added to the molten slag.
13. The method of claim 12,
Melting and transferring molten slag generated in a steelmaking and steelmaking process to a tundish,
The method of producing a fire-resistant fibers and the oxide is _{SiO 2, Al 2 O 3,} Na 2 O , or to a combination thereof.
14. The method of claim 13,
Melting and transferring molten slag generated in a steelmaking and steelmaking process to a tundish,
Wherein the molten slag is a blast furnace slag, a converter slag, or a combination thereof.
The method according to claim 6,
Recovering sensible heat from the fibers,
Transferring and laminating the fibers through a lower end of the first chamber to a second chamber; And
And recovering sensible heat from the fibers laminated to the second chamber.
16. The method of claim 15,
Recovering sensible heat from the fibers,
Cooling the fiber,
And recovering heat generated from the cooled fibers.
17. The method of claim 16,
Recovering sensible heat from the fibers; Previously, the temperature of the fiber,
Recovering sensible heat from the fibers; Wherein the difference in temperature of the fiber cooled by the heating means is 200 DEG C or higher.
18. The method of claim 17,
And recovering sensible heat from the fibers,
And the recovered heat energy is reused.
Melting and transferring the molten slag generated in the steelmaking and steelmaking processes to the tundish;
Spraying the molten slag transferred to the tundish into the first chamber through a nozzle at the bottom of the tundish;
Spraying a gas onto the molten slag injected into the first chamber to produce a fiber;
Mixing the fiber with the binder; And
And a step of pressurizing and molding the fiber mixed with the binder to produce a heat insulating material.
20. The method of claim 19,
Spraying a gas onto the molten slag injected into the first chamber to produce a fiber; Since the,
And recovering sensible heat from the fibers.
20. The method of claim 19,
Mixing the prepared fibers with a binder,
Wherein the binder comprises an inorganic binder.
22. The method of claim 21,
Mixing the prepared fibers with a binder,
Wherein the binder comprises calcium sulfate, sodium silicate, alumina silicate, calcium silicate, or a combination thereof.
23. The method of claim 22,
Mixing the prepared fibers with a binder,
Wherein the binder is added in an amount of more than 0 parts by weight and not more than 5 parts by weight based on 100 parts by weight of the fibers.

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