KR101588384B1 - manuracturing method of fire brick - Google Patents

Abstract

The present invention relates to a refractory brick manufacturing method, and more particularly, to a refractory brick manufacturing method, and more particularly, to a refractory brick manufacturing method which recycles waste sludge treated with water treatment sludge to prevent environmental pollution and increase resource utilization, To a refractory brick manufacturing method capable of producing refractory bricks excellent in chemical resistance and strength and light in weight.
According to an aspect of the present invention, there is provided a method for producing a sintered body, comprising the steps of: a first crushing step of crushing a composition comprising a mixture of pyrophyllite and clay; a second crushing step of crushing the mixture produced in the first crushing step, A molding step of producing the mixture produced in the second milling step in the form of refractory bricks, a drying step of drying the refractory bricks produced in the molding step, a calcining step of calcining the refractory bricks dried in the drying step in a kiln .

Description

{Manufacturing method of fire brick}

The present invention relates to a refractory brick manufacturing method, and more particularly, to a refractory brick manufacturing method, and more particularly, to a refractory brick manufacturing method which recycles waste sludge treated with water treatment sludge to prevent environmental pollution and increase resource utilization, To a refractory brick manufacturing method capable of producing refractory bricks excellent in chemical resistance and strength and light in weight.

In general, refractory bricks are required to have high fire resistance, high strength, high thermal shock resistance, and strong resistance to chemical erosion. Such conditions are highly dependent on the raw materials used and the manufacturing process, It is differentiated according to the manufacturing process.

That is, depending on the kind of the raw material, there are a quartz brick, a clay brick, a high alumina brick, and a chrome-magnesia brick, and the fired brick made by crushing, kneading, molding, , A fluorine-free brick which is formed by applying a chemical binder to a stable raw material and molding it at a high pressure, and a pyrogenic brick made by melting a raw material in an electric furnace and injecting it into a mold.

Since refractory bricks, which are the components of incinerators used in the incineration process, are resistant to high temperatures up to 900 ° C to 1000 ° C, the oxides are incinerated. There is a problem that the life time is shortened due to corrosion by the harmful gas coming out from the gas.

In order to solve such a problem, a technique disclosed in Korean Patent Laid-Open No. 10-2004-0032158 as shown in FIG. 1 has been proposed. The technical characteristics thereof include a raw material purchasing step for preparing high quality clay and clay; A first mixing step of uniformly mixing the purchased loess and clay, transporting and mixing loess and clay mixed with the loess and clay, and transferring and stoning the transferred loess and clay; A second mixing step of mixing the germanium powder with the clay so that the germanium powder is pulverized by passing the germanium powder through the clay and the clay is mixed with 50% of the loess, 30% of the clay and 20% of the germanium powder; A vacuum churning step of compressing the kneaded raw material to remove air in the raw material and discharging the bricks of a desired shape, A cutting step of cutting a predetermined size; And a firing step of firing the cut bricks at a high temperature of 1,300 캜.

However, the technology disclosed in Korean Patent Laid-Open No. 10-2004-0032158 has an effect of increasing the acid resistance by containing germanium in the refractory brick, but the cost of germanium is high and the overall manufacturing cost is increased.

In addition, when clay is used in the manufacture of refractory bricks, the chamot (which is obtained by calcining the clay and pulverized into powder) should not be deformed or cracked during firing. If such a chamois is used, There is a problem in that the manufacturing cost is increased because of the complicated structure. The technique disclosed in Korean Patent Laid-Open No. 10-2004-0032158 does not use the chamois but in order to prevent deformation or cracking during firing There is a problem in that the process is complicated because the air is removed through the vacuum pouring process.

SUMMARY OF THE INVENTION The present invention has been conceived to solve the above-mentioned problems, and an object of the present invention is to provide a process for producing a mixture comprising a first mixing step of mixing pyrophyllite and clay, a first wet milling step of pulverizing a first mixed composition, A second mixing step of adding a sludge-treated material to the mixture, a second wet-milling step of re-pulverizing the second mixed composition, a molding process of molding the shape of the refractory brick using the composition produced in the second wet- A drying step of drying the refractory bricks formed in the process, and a sintering step of sintering the dried refractory bricks. By including the sludge treated product obtained by treating the water sludge sludge in the composition, the waste material can be recycled, In addition to improving the utilization of resources, the use of alumina and silicon dioxide contained in sludge treated water to improve the acid resistance, chemical resistance, Becomes like sex, is also a lighter weight by the micropores, strength is to provide a method for manufacturing refractory bricks can be manufactured in a good refractory brick.

Another object of the present invention is to provide a refractory brick which comprises pyrophyllite in a composition for producing a refractory brick, wherein the pyromellitic pyrochlore comprises pyroxene Thus, even when the chamois is not used, deformation or cracking does not occur during the firing process. Therefore, the process for using the chamois can be omitted, so that it is possible to manufacture the refractory brick with ease of manufacture and thus the manufacturing cost can be reduced .

SUMMARY OF THE INVENTION [0006]

A first crushing step of crushing a composition comprising a mixture of pyrophyllite and clay, a second crushing step of crushing the mixture produced in the first crushing step by adding a sludge treated material, and a step of crushing the mixture produced in the second crushing step A brick molding process, a drying process for drying the refractory bricks produced in the molding process, and a baking process for baking refractory bricks dried in the drying process in a kiln.

In the primary pulverization step, 15 to 25 parts by weight of pyrophyllite and 5 to 15 parts by weight of white clay are mixed.

In the second pulverizing step, 25 to 35 parts by weight of the sludge-treated material is added to the mixture produced in the first pulverizing step.

At this time, the sludge treated product is characterized in that the water treatment sludge is calcined.

Here, the sludge treated product is characterized by comprising silicon dioxide, alumina, and an inorganic material.

On the other hand, the firing step is characterized in that firing is performed at 1000 to 1200 ° C for 4 hours.

The drying step is characterized in that the molded refractory bricks are dried for 24 hours so that the water content becomes 20%.

The primary pulverization step and the secondary pulverization step are characterized by wet pulverization.

According to the present invention having the above-described constitution, it is possible to carry out a first mixing step of mixing pyrophyllite and clay, a first wet milling step of pulverizing a first mixed composition, a second mixing step of adding a sludge- A second wet grinding process for re-grinding the second mixed composition, a molding process for molding the shape of the refractory bricks using the composition produced in the second wet grinding process, a drying process for drying the refractory bricks formed in the molding process And a sintering step of sintering the refractory bricks. The sludge treated sludge treated with water treatment sludge is used to recycle the waste material, thereby preventing environmental pollution and increasing resource utilization, Alumina and silicon dioxide contained in the treated product improve the acid resistance, chemical resistance and heat resistance of the refractory brick, It is possible to manufacture refractory bricks which are lighter and have a higher strength.

In the present invention, when clay is used, a chamot which is crushed after crushing and crushed into powder should be used, so that deformation or cracking does not occur at the time of plastic working. By including pyrophyllite in a composition for producing refractory bricks, It is possible to omit the step of using the chamois, so that it is easy to manufacture and the manufacturing cost can be reduced accordingly.

1 is a flow chart of a conventional refractory brick manufacturing method.
2 is a process diagram of a refractory brick manufacturing method according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same reference numerals are used for the same constituent elements in the drawings and redundant explanations for the same constituent elements are omitted. It is to be understood that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

2 is a process diagram of a refractory brick manufacturing method according to the present invention.

The present invention relates to a refractory brick manufacturing method. As shown in FIG. 2, the refractory brick manufacturing method includes a first crushing step (100) of mixing and crushing a composition for producing refractory bricks, , A second milling step (200) in which a new composition is further added and then pulverized, a molding step (300) for molding the shape of refractory bricks using the composition formed in the second milling step (200), and a step A drying process 400 for drying the refractory bricks produced in the drying process 400 and a calcination process 500 for calcining the refractory bricks dried in the drying process 400 in a kiln.

In the first milling step (100), 15 to 25 parts by weight of pyrophyllite and 5 to 15 parts by weight of clay are mixed as a composition for producing refractory bricks, and then pulverized. The pulverization is performed by wet grinding , But it is pulverized for about 24 hours depending on the amount of the mixture.

The wet pulverization corresponds to the dry pulverization. The pulverization is performed by dispersing the material in water (using various liquids as needed) for the purpose of pulverization. The solid concentration at the time of pulverization is usually 50 to 70% .

When the wet grinding is used, the fine powder is removed from the grinding machine, so there is no buffering effect due to the fine powder and there is no aggregation of the fine powder. Therefore, the grinding ability per unit of the grinding unit is high and the mixing and dispersion of the material And the pulverized product can be transported by using the pump, so that the dust is not exposed to the outside, and the work can be performed in a pleasant environment.

On the other hand, when clay (clay, loess, etc.) is generally used in refractory bricks, the clay is subjected to plastic working and then crushed into powder, There is a problem that deformation occurs in the firing step 500 due to the moisture contained in the firing step 500 or cracks occur in the severe firing step and thus a chamot is used and the manufacturing process is complicated The manufacturing cost is increased.

However, in the present invention, pyrophyllite is used in combination with clay, since pyroxene has a small number of crystals, so that the pyrolysis shrinkage is small and mixing with clay does not require a process for producing chamois, simplifying the manufacturing process, .

On the other hand, if less than 15 parts by weight of pyrophyllite is used in the mixture for producing refractory bricks or more than 15 parts by weight of clay is used, the proportion of clay is increased, and the product is deformed Cracks may occur if they occur.

In addition, when pyrethroid is used more than 25 parts by weight, or when less than 5 parts by weight of clay is used, there is a problem that the viscosity of the composition decreases and the strength of the product may be lowered.

In the second milling step 200, 25 to 35 parts by weight of the sludge-treated material is further added to the mixture formed in the first milling step 100 and then pulverized by a wet grinding method. In this case, There is a slight difference depending on the amount, but on average, it will be crushed for about 3 hours.

Here, the sludge treatment is a treatment of sludge generated in a water purification plant. Sludge generated in a water purification plant is composed of 60% of inorganic matter, 30% of organic matter, and many other materials. , And then sintered in a sintering furnace to produce a sludge treated product.

The sludge produced by treating the sludge generated in the water treatment plant is composed of about 50% of silicon dioxide, about 40% of alumina, and a large number of minerals, and its characteristics include a large amount of micropores, Strength is superior to light weight.

Therefore, when the sludge-treated material is added to a composition for producing refractory bricks, refractory bricks are lightweight while maintaining appropriate strength, and therefore, when the refractory brick of the present invention is applied, . ≪ / RTI >

Since the sludge treated product contains silicon dioxide, the manufactured refractory bricks have excellent acid resistance. Further, since the sludge treated product contains alumina and has excellent chemical resistance, It is possible to prevent the refractory brick from being oxidized and corroded by the gas.

If less than 25 parts by weight of the sludge-treated material is used, the overall weight of the sludge-treated material is increased and the acid resistance and chemical resistance of the sludge treated material are lowered. If the sludge treatment amount is more than 35 parts by weight, Can be degraded.

When refractory bricks are manufactured from pyrophyllite, white clay and sludge treated materials, SK33 is the basic condition of refractory bricks as well as acid resistance and chemical resistance, and the refractory grade to be fundamentally satisfied in refractory materials is SK26. It has an excellent fire resistance exceeding the reference fire resistance.

On the other hand, since the sludge treated material is buried without being recycled in the past, it is a main cause of accelerating environmental pollution. In the present invention, environmental pollution can be prevented by recycling it.

In other words, the annual sludge generated in the whole country is about 1.3 million tons. The amount of sludge treated when treating 1 ton of sludge is about 200 kg, and the amount of sludge treated is about 26 And the sludge treated water thus generated is buried in the ground to accelerate pollution of the environment.

However, in the present invention, by recycling the sludge-treated material to be buried, environmental pollution that is accelerated can be prevented, and refractory bricks of good quality can be manufactured.

In the forming step 300, a refractory brick is formed by using the composition formed in the second wet process 200. In the drying step 400, the refractory bricks formed in the forming step 300 , Which is dried for 24 hours so that the moisture content of the refractory brick molding is 20%.

At this time, if the moisture content of the refractory brick molding exceeds 20%, the moisture is abruptly reduced in the firing step (500), and the refractory brick is deformed or cracked when it is severe.

Meanwhile, in the firing process 400, the refractory bricks formed in the drying process 400 are fired in a kiln. The firing temperature is maintained at 1000 to 1200 ° C. and fired for 4 hours to form a refractory brick .

If the temperature at the time of firing is lower than 1000 ° C, the heat resistance of the manufactured refractory bricks may be deteriorated. If the firing temperature is higher than 1200 ° C, it is difficult to maintain the high temperature and the manufacturing cost is increased.

While the present invention has been described in connection with certain exemplary embodiments, it is to be understood that the scope of the present invention is not limited to the disclosed embodiments, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

The present invention relates to a refractory brick manufacturing method, and more particularly, to a refractory brick manufacturing method, and more particularly, to a refractory brick manufacturing method which recycles treated sludge treated water treatment sludge to prevent environmental pollution and increase resource utilization, To a refractory brick manufacturing method capable of producing refractory bricks excellent in chemical resistance and strength and light in weight.

100: primary pulverization process 200: secondary pulverization process
300: Forming process 400: Drying process
500: Firing process

Claims (8)

15 to 25 parts by weight of pyrophyllite and 5 to 15 parts by weight of clay,
A second pulverizing step of adding 25 to 35 parts by weight of sludge treated by sintering the water treatment plant sludge to the mixture produced in the first pulverizing step,
A molding process for producing the mixture produced in the second milling step in the form of refractory bricks,
A drying step of drying the refractory bricks produced in the molding step,
And a sintering step of sintering the refractory bricks dried in the drying step in a kiln,
The sludge treated product is made of an inorganic material containing 50% of silicon dioxide and 40% of alumina,
In the above firing step, firing is performed at 1000 to 1200 ° C for 4 hours,
In the drying step, the molded refractory bricks are dried for 24 hours to have a water content of 20%
Wherein the primary pulverization step and the secondary pulverization step are performed by wet pulverization.
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