KR20010085214A - Rock wool using as raw material granulated municipal waste incineration ash and production method thereof - Google Patents

Abstract

The present invention relates to rock wool obtained by incineration of municipal waste incinerators, which are difficult to use as powders, to be reused as wastes at low cost by processing particles into agglomerates at low cost, and then fed into a melting furnace together with a raw material, followed by melting and fibrous molding. Provide technology.

Description

Rock wool made from granulated materials of municipal waste incineration ash and its manufacturing method {ROCK WOOL USING AS RAW MATERIAL GRANULATED MUNICIPAL WASTE INCINERATION ASH AND PRODUCTION METHOD THEREOF}

Conventionally, rock wool is a method in which a raw material mixture obtained by adding a component composition to a lump slag or natural stone in a lump form is poured into a cupola, and coke is melted as a main fuel to make the molten fiber fibre; The molten slag generated in the furnace is subjected to high heat charge (also referred to as "hot charge") in an electric furnace, and is mainly manufactured by a direct method of fiberizing the melt. In recent years, incineration of general wastes exceeding 6 million tons per year as a social demand is partially slack from ceramic applications such as cement, refractory materials, lightweight aggregates, or melting, and thus, slab, road aggregates, concrete aggregates, blocks, etc. Most of them are disposed of by landfills.

Examples of the use of incineration ash as a raw material for rock wool production are as follows. That is, Japanese Patent Laid-Open No. 53-94460 describes a method for melting general industrial wastewater and industrial waste incineration ash to produce rock wool or other equivalents, and Japanese Patent Laid-Open No. 5-3329463 describes an electric furnace for melting incineration ash. A method of appropriately controlling the thickness of an incinerator layer is described in the following. In addition, Japanese Patent Application Laid-Open No. Hei 6-92750 describes a method of producing a slack wool surface by injecting a raw material mixture including an incineration ash of dry filth into a cupola, and fiberizing the molten liquid dirt slack. On the other hand, in the case of the production of rock wool by recycling the municipal waste incineration ash as a direct raw material, it is difficult to put it into the melting furnace because the specific gravity of the incineration ash itself is too low, especially in the case of the cupola, violently and a large amount of dust. This occurs, so there is a problem such as the dust is communicated to the interior of the cupola is practically impossible. Further, as described in Japanese Patent Application Laid-Open No. Hei 10-273332, there is a production method in which a molten slag of municipal waste incineration ash is melted in an electric furnace to form a fiber. This method has already been put to practical use but has a problem of high production cost. In other words, prior to the step of melting and slacking urban waste incineration ash, the facility investment cost of billions of yen is needed as the practical scale of the dedicated equipment, and the melting temperature for melting and slagging is 1300 ° C to 1550 ° C. In terms of costs, it is known that the production cost is 3-70,000 yen / ton.

When producing rock wool made from municipal waste incinerators, it is difficult to put powder into the melting furnace as it is, so that large amounts of incinerators generated in the furnace are scattered by the exhaust duct or treatment equipment as dust, and the duct or dust box is clogged. A situation that stops occurs. In view of the above situation, an object of the present invention is to provide a target rock wool and a method of manufacturing the same by treating the municipal waste incinerator as a light weight powder with a small volume specific gravity at low cost and melting it with high efficiency at low cost. .

The present invention relates to the recycling of municipal waste incinerators that are eager for effective utilization from the viewpoint of environmental conservation and resource reuse. The present invention relates to the use of various reinforcing fibers such as insulation, sound absorbing materials, and various reinforcing fibers, using the processed municipal waste incinerators as raw materials. It is to provide a rock wool suitable for producing at low cost and a method of manufacturing the same for use as a furnace.

Figure 1 shows a schematic cross-sectional view of the rock wool production according to the present invention.

In order to realize the above object, the present invention has found that a rock-solid product can be obtained by melting a granulated product of a municipal solid waste incinerator as a lump-like solid raw material at low cost. Light weight powder with low specific gravity can not be used as it is, the city waste incineration ash slag at the same high cost without the need to re-melt in the melting furnace, the present invention directly added particles and particles to the powder of the municipal waste incinerator It is a technique that makes it possible to use it as a raw material for rock wool by processing and drying it again. In addition, the use ratio of the municipal waste incineration ash which has been processed into particles is preferably in the range of 50 to 90% by weight in order to reduce the cost and to effectively increase the amount used as a raw material. In this case, steel slag, turquoise, It is preferable to mix silica and shot waste generated during rock wool production. As a furnace used for efficiently melting the particle processed material as a raw material, the use of cupola is preferable in terms of cost, and the size of the particle processed material has an average diameter of 20 to 50 mm to efficiently melt the molten state. Found that you can get In addition, as a production apparatus of the above-mentioned particle processed material, a briquetting machine having high productivity is employed, and the molten metal obtained by injecting a raw material mixed with the particle processed material of urban waste incineration ash and the adjusting raw material into a cupola, burning the coke and heating and melting it at a high speed. It is possible to produce a desired rock wool by fiberizing a rotating spinner.

Hereinafter, a preferred embodiment of the present invention will be described.

FIG. 1 illustrates a method of mixing granulated materials (cricket) of municipal municipal waste incinerators dried after molding according to an embodiment of the present invention as a control raw material, into a cupola, and rotating molten metal such as municipal waste incinerators obtained by melting at high speed. It is a schematic cross-sectional explanatory drawing which shows that it manufactures rock wool by fiberizing with a spinner.

In the drawing, the raw material mixture 3 of the grit 1, which is a granulated product of the municipal waste incineration ash, and the adjusting raw material 2 is transported by a batch (not shown) which is a raw material supply device, and the cupola 4 Is injected from the inlet (5). The lump-shaped coke 6 deposited in the cupola 4 is burned under the supply of air or oxygen-rich air blown from the tuyeres 7, and the generated high-temperature combustion gas is agglomerated in the cupola 4. It rises to the clearance gap between the type | mold cokes 6, and it raises via the clearance gap between the raw material mixtures 3 of the upper part, passes through the exhaust duct 8, and reaches | attains the waste gas processing apparatus (not shown). The raw material mixture 3 introduced from the inlet 50 of the cupola 4 is first deposited in the upper heating region in the cupola 4. Here, the raw material mixture 3 receives the rising combustion gas and heats it, and gradually lowers the heating zone until melting starts. Thereafter, the raw material mixture 3 is dissolved in the melting zone under the heating zone. The melted raw material mixture 3 again moves to the drop zone where the bed coke 6 at its lower part accumulates, falls through the gap between the combusted bed coke 6, falls into the droplet shape, and is heated by the hot air coming from the bottom. It becomes the state of high temperature molten metal. The raw material mixture 3 melted through the series of heating zones, melting zones, and drop zones becomes a high temperature molten metal before and after the maximum temperature of 1500 ° C. and reaches the molten metal reservoir 9. The fiber 13 is then fibrized by the spinner 12 rotating at a high speed from the hot water outlet 10 through the fire resistant trough 11. The raw surface 13 is molded into a plate-shaped board product, a roll-shaped product having a flexibility, a granular surface, and the like by various forming apparatuses (not shown) directly connected. The molten material 14 of various metals mainly mixed with the municipal waste incineration ashes is deposited at the lowest part of the hot water storage facility 9 and discharged to the outside of the furnace in a timely manner.

The feedstock (2), which is fed together with the briquette (1) as the raw material mixture (3), adjusts the chemical composition so as to have a desirable molten and fibrous state and have various desirable rock wool characteristics, and assists the municipal waste incineration ash as the main raw material. Examples of the raw material include steel slack, coal stone, and silica shot waste.

In view of the effective use of municipal waste incineration ash, it is desirable to increase the use ratio of the incineration ash possible, but the present inventors and the like change the ratio of use of the briquette 1 and the adjusting raw material 2 so that the meltability in the cupola 4, As a result of earnestly examining the fiberization efficiency and various material properties of the manufactured raw material 13, the use rate of the briquette 1 is 50 to 90% by weight, and the rock wool produced by blending the raw material 2 with this is conventionally Compared to rock wool produced using steel slag by the main method as a main raw material, the present invention has a slightly darker color, but has no difference in performance, and it can be sufficiently used as a heat insulating material, a sound absorbing material, or various reinforcing materials.

Municipal waste incinerators usually have specific gravity within the range of about 0.5 to 1.0, and generally about 30 to 50% by weight of SiO ₂ , about 10 to 25% by weight of Al ₂ O _{3, and} about 25 to 50% by weight of CaO and MgO. It contains% as a main component. In the present invention, such municipal waste incineration materials can be used, but the present invention is not limited thereto.

Fibrous rockwool chemical composition obtained by using the briquette 1 at 50 to 90% by weight is changed depending on the chemical composition of the municipal waste incineration ash used, the type and amount of the raw material used, and the composition of Ca0 is 24.0 to 35.0. % By weight, 38.0-46.0% by weight of SiO ₂ , 14.0-22.0% by weight of Al ₂ O ₃ , 0-5% by weight of MgO, 1.0-7.0% by weight of Fe ₂ O ₃ , R ₂ O (R is an alkali metal Represents 0 to 5.0% by weight. As shown in Table 1 below, the rock wool of the present invention has a significantly smaller content of CaO and MgO compared to rock wool prepared using a conventional steel slag as a main raw material, and the content of SiO ₂ , Al ₂ O ₃ , R ₂ O The content is increased while Fe ₂ O ₃ is particularly high. The high content of SiO ₂ or Al ₂ O _{3 and} the low content of CaO or MgO reinforce the glass skeleton, improve the strength and durability of the fiber, and hinder melting. Since Fe ₂ O ₃ has the same effect as CaO which increases the meltability, practical rock wool is obtained as long as the chemical composition of rock wool using 50 to 90% by weight of the grain processed material of municipal waste incineration ash is within the above range. In addition, the color of the molten metal melted with the municipal waste incinerator as the main raw material has a high content of Fe ₂ O _{3 to give} a black or blackish brown color. It becomes the degree with some coloring about.

The adjustment by the adjustment raw material for making the composition of the municipal waste incineration ash into rock wool is preferably adjusted to silica when SiO ₂ is extremely small, and to coal stone when CaO is extremely small. In the case of using the adjustment raw material for composition adjustment, it is practically preferable to add the adjustment raw material when the briquette formed from the municipal waste incineration ash is introduced into the cupola.

In rock wool production, it is preferable to use cupola as a melting furnace for the processing of particles of municipal waste incinerators. When the cupola is used, the briquette 1 flowing into the cupola in the molten state is subjected to the dynamic contact of the hot combustion gas rapidly rising through the gap between the briquettes 1 by the combustion of the bed coke 6. Efficiently melt on the surface, and in the lower part of the cupola 4, efficient heat exchange is achieved in a liquid continuous manner, and it is possible to strongly and efficiently melt raw materials that enrich the color such as municipal waste incineration raw materials. . Even when melting the processed grains of municipal waste incineration ash using an electric furnace, there is no particular problem in the production of rock wool, but it is preferable to use a cupola in consideration of high energy costs and low melting performance. The energy costs to melt the processed raw materials of municipal waste incinerators are about 150,000 eng / ton in electric furnaces and about 2000 eng / ton in Cupola.

The size of the briquette 1 is preferably about 20 to 50 mm in average to obtain an efficient molten state. In the case where the average diameter is smaller than the above average diameter, the powder from the briquette 1 rises or scatters at an early stage before and after melting by the combustion gas, causing an obstacle in the rising passage of the combustion gas for melting. On the other hand, in the case of the average diameter exceeding the above range, briquettes are likely to be destroyed, so it may take a long time from the start of melting in the cupola to the end of melting, or it may take a long time due to drying in the manufacture of the briquette (1), In addition, there is a problem that the mixing of the briquette 1 and the adjusting raw material 2 is insufficient and the homogenization process of the molten metal is delayed.

It is preferable that the shape of the particle processed material of the municipal waste incineration material put into the melting furnace is in the form of a lump, but the spherical shape, the irregular shape, the ellipsoidal sphere, the flat ellipsoidal shape, the briquette shape, etc. are possible by the manufacturing function of the particle machine. The average diameter of the spherical briquettes can be obtained by converting them into spheres having the same volume to obtain a diameter and estimating the average thereof.

Briquetting is preferably carried out by high compression, and also by high temperature and high compression. Moreover, a binder can also be used at the time of briquetting. Examples of the binder include, but are not limited to, molasses, cement, water glass, bentonite, and the like. If the briquettes do not have sufficient hardness, there is a problem that the briquettes in the cupola collapse and the blockage occurs in the lower part of the cupola due to the wind.

As a method of manufacturing the particle processed material of municipal waste incineration materials, an electric granulation method, a compression granulation method, a fluidized bed granulation method, etc. are mentioned. Among these various manufacturing methods, compression granulation is preferable, and in particular, a roll press type briquetting machine can mass-produce large particles, produce particles with high specific gravity, and process particles into powders having a relatively low water content. It is preferable in that it can be said to be an optimum particle processing device for municipal waste incineration because of its continuous, mass production and high economic efficiency.

In the conventional method of obtaining raw materials by melting and scraping the known municipal waste incineration ash, the equipment processing cost of billions of eng and the production cost of 3 to 70,000 eng / ton are required on a practical scale, whereas the particle processing apparatus for urban waste incineration ash of the present invention is used. In the case of using as a raw material for rock wool production, it takes about 100 million yen for the equipment processing cost of the grain processing equipment, and the production cost is 0.30,000 yen / ton, which is a practical material with high facility investment and production cost.

The molding conditions in the case of granulating the municipal waste incineration ash using the above-mentioned briquetting machine or the like include moisture content and the type and amount of binder to be added. Examples of the optimal binder include molasses and cement, but water glass, pulp waste liquid, bentonite, softner, caustic soda and the like can also be used. In addition, as a briquetting machine, it is necessary to consider the rotational speed and the granular compression force.

Examples 1-5 and Comparative Examples

In order to confirm the performance of the rock wool obtained by using the particle processed material (briquette) of the municipal waste incineration ash according to the present invention as a main raw material, it is dried after forming by using a briquetting machine, and the two types of particle processed material and molten slack in the couola during operation. By varying the use ratio, the chemical composition of the obtained rock wool raw material, the tensile strength of the short fibers, and the strength of the board formed from the raw material were compared with those of the conventional rock slab based on the conventional steel slag. .

Item Example 1 Example 2 Example 3 Example 4 Example 5 Comparative example 1) Raw material (1) Briquette A wt% (2) Briquette B wt% (3) Steel slag w% 5050 7030 404040 504010 100 100 2) Briquette molding condition (1) Water content [wt% after drying] (2) Binder [type] [addition wt%] (3) Particle processing molding [state] [average weight g] [specific gravity] 2.8 Molasses 2.2 Good 2.9 Molasses 2.2 Good 2.8 Molasses 2.3 Good 3.0 Cement 11.0 Good 3.0 Cement 12.0 Good 3) Melt state in cupola normal normal normal normal normal normal 4) Melt slag (cooling confirmation) [foam, foreign material] [colored state] Yes (normal) Dark brown Yes (Normal) Black Yes (Normal) Black Yes (Normal) Black Yes (Normal) Black Yes (normal) Dark brown 5) Rockwool chemical composition wt% CaOSiO ₂ Al ₂ O ₃ MgOFe ₂ O ₃ R ₂ OTiO ₂ Other 34.7837.8915.525.212.472.351.110.67 27.7243.8615.943.611.904.621.370.98 27.6142.7016.513.782.924.381.250.85 29.5741.5415.673.193.484.371.121.06 25.8645.3815.562.172.815.831.420.97 38.0540.2413.735.800.350.270.720.84 6) Rockwool fiber [state] [average diameter μ] [short fiber tensile strength kg / cm ² ] Normal 770.72 740.71 Light coloring 740.70 Light coloring Normal 730.71 Normal 700.67 Light yellowish brown Normal 780.72 Almost White 7) Properties of product board [Bending strength kg / cm ² ] [Compression strength kg / cm ² ] [Thermal compression temperature ℃] 3.00.72640 2.90.71632 2.80.70625 2.80.71626 2.60.67615 2.80.72642 Comprehensive Evaluation No problem No problem No problem No problem Defect Standard

Note) In rock-based chemical composition, [others] refers to components such as MnO, S, ZnO, BaO, P, CuO, etc.

Display.

Test conditions and check items for Table 1 are as follows.

1. Table 2 shows the chemical composition and ratio (wt%) of briquettes (A, B) 2 varieties of urban waste incineration ash as raw materials and steel slag.

ingredient Briquette A Briquette B Steel Slack (Comparison) CaO 26.31 24.01 38.0-44.0 SiO ₂ 41.45 48.03 33.0-41.0 Al ₂ O ₃ 17.32 16.72 13.0 to 15.0 MgO 3.84 2.39 6.0-7.0 Fe ₂ O ₃ 4.52 2.66 0.2 to 0.4 R ₂ O 4.26 6.38 0.2 to 0.6 TiO ₂ 1.09 1.46 0.7 to 2.0 S 0.27 0.13 0.6 to 1.1 Goat 0.10 0.12 No measurement Etc 0.84 1.10 0.5 to 0.9

(Others are minor components such as MnO, BaO, SrO, P, ZnO)

2. Briquette molding of municipal waste incineration

Moisture content Before drying: 10.3 ~ 12.5 wt%

After drying: 2.8 ~ 3.0 wt%

Addition amount of binder: molasses (2.2 to 2.3% by weight)

Cement (11.0-12.0 wt%)

Molding Machine Molding Pressure: 5ton / cm ³

3. Use ratio and test amount of test material

Use ratio: change to the range of 30 to 100% by weight

Test amount: 10 to 15 tons per test

4. Check Items

-Molten state and dust scattering condition in cupola

-Quality of the molten metal (colored state, containing impurities, foreign matters)

-Fibrosis status (outflow temperature and flow rate, short amount of unfiberized substance)

Rockwool cotton (chemical composition, fiber diameter, short fiber tensile strength)

Rockwool board (flexural strength, compressive strength, heat shrinkage temperature)

Test situation and test result about Table 1 are as follows.

Test situation:

In Examples 1 to 5, steel slag was selected as the adjustment raw material, the mixing ratio of Briquettes A and B was changed, and coke of fuel was added to the cupola having a melting performance of 5 tons per hour. In 30 minutes after the briquettes were put in, the dark brownish molten metal was leaked, and the raw material passed through the cupola in about 30 minutes, and it was assumed that the raw material was replaced with another raw material.

Test Result:

For rock wool mainly composed of conventional steel slag as a comparative example, Examples 1 to 4 have problems with manufacturing conditions such as molten state, molten metal quality, fiberized state, rock wool cotton and product quality of rock wool board, etc. It was concluded that commercialization is possible without. In addition, when 100 wt% Briquette B was added as a raw material of Example 5, a slight molten state of adhesion occurred to the fiberized state, and the colored state of the raw material was also slightly stronger than that of the other Examples, and the short fibers were short fibers. Tensile strength, flexural strength, compressive strength, and heat shrinkage temperature of product board were inferior. Therefore, it was concluded that the raw material use ratio of the municipal waste incinerator briquettes is preferably 50% by weight to 90% by weight.

In Table 1, the tensile strength measurement of the raw single fiber was performed based on JIS R7601 (1986). Insulation boards were formed by drying and solidifying a cotton coated with about 2% by weight of phenolic resin at the time of fiberization, the density of 80kg / cm ³ , a thickness of 50 mm as a sample for strength measurement. The flexural strength, compressive strength, and hot shrinkage temperature of the product board were measured based on JIS A9504 (1995).

As described above, according to the present invention, as a recycling method of municipal waste incineration ash, the ash ash powder is solidified by a particle processing method (assembly method), thereby solving the difficulty of using raw materials in the conventional powder and at the same time, a well-known incineration ash powder. Unlike the raw material manufacturing method of melt-slaging the sieve, the granulation machine of the municipal waste incineration ash is obtained inexpensively and easily by using a particle processing machine, and the raw material can mass-produce rock wool like a conventional variety.

The desired rock wool can be produced by mixing urban waste incineration with a solid material in a particle processing device, mixing the coarse processed material with the coordinating raw material, and feeding it into a cupola. .

Claims (6)

A rock wool obtained by melting and fibrous raw materials obtained by processing municipal waste incinerators together with crude raw materials. The rock wool according to claim 1, wherein the use ratio of the raw material in which the municipal waste incineration ash is processed is 50 to 90% by weight. The rock wool according to claim 1 or 2, wherein the raw material obtained by granulating the municipal waste incineration ash is obtained by melting and fiberizing the raw material with a cupola. The rock wool according to claim 3, wherein the size of the raw material in which the municipal waste incineration ash is processed has an average diameter of 20 to 50 mm. The rock wool according to claim 3 or 4, wherein a briquetting machine is used to form the municipal waste incineration ash as a raw material. A method for producing rock wool, characterized in that a mixed raw material including a raw material and an adjusted raw material in which municipal waste incinerators are processed is fed into a cupola, and the molten metal obtained by melting is fibrous with a spinner rotating at high speed.