KR101638583B1

KR101638583B1 - Method for manufacturing artificial lightweight aggregate

Info

Publication number: KR101638583B1
Application number: KR1020150165073A
Authority: KR
Inventors: 김부일; 이창식; 최석환; 박경일; 심병철; 김정식; 서영민; 이영재
Original assignee: 한국남동발전 주식회사
Priority date: 2015-11-24
Filing date: 2015-11-24
Publication date: 2016-07-11

Abstract

A method for manufacturing an artificial lightweight aggregate using bottom ash and dredged soil includes the steps of: individually pulverizing the bottom ash and the dredged soil using a pulverizer; feeding the bottom ash and the dredged soil, which have experienced the pulverizing, to individual storage hoppers, respectively; feeding the bottom ash and the dredged soil from the individual storage hoppers to a mixing hopper and mixing the bottom ash and the dredged soil; feeding a mixed raw material from the mixing hopper to a mixing pulverizer and then mixedly pulverizing the mixed raw material in the mixing pulverizer; forming, in a predetermined shape, the mixed raw material having experienced the mixedly pulverizing; and baking the mixed raw material having experienced the forming in a baking furnace. Accordingly, the present invention primarily and individually pulverizes the bottom ash and the dredged soil and then mixedly pulverizes the bottom ash and the dredged soil together, thereby improving a fine degree and a mixed ratio of the mixed raw material.

Description

TECHNICAL FIELD The present invention relates to a method for manufacturing artificial lightweight aggregate,

The present invention relates to a method for producing an artificial lightweight aggregate, and more particularly, to a method for producing an artificial lightweight aggregate capable of producing fine artificial lightweight aggregate with improved fineness and mixing ratio of the raw material.

The aggregate used as the main material for the construction of the structure is increasing in demand along with the acceleration of economic development. However, the production is rapidly decreasing due to the reasons of harvesting difficulties such as environmental preservation of rivers, dam construction and resource stockpiling, and depletion of natural resources. On the other hand, industrial wastes are rapidly increasing in quantity every year due to industrial development, And a method for applying the present invention to the manufacture of aggregate has recently been proposed.

In particular, fly ash generated from a thermal power plant among industrial wastes is exemplified, and the fly ash is generated as combustion residue when the fly ash is burned in a boiler. The pulverized coal is injected into the furnace at high speed in a hot air stream and instantaneously burned in a floating state at a temperature of 1,500 ± 200 ° C, which is higher than the melting point of the minerals contained in the coal. As a result, the fly ash is subject to various chemical and physical changes depending on not only the combustion temperature but also the burden, the degree of crushing, the residence time in the high temperature part of the furnace, Most of the coal ash produced in this way is in the form of very fine powder, which is carried out in the combustion chamber together with the flue gas and collected in the electrostatic precipitator. Such fly ash and Cinder ash), and bottom ash in which the pulverized coal is burnt down into the combustion furnace in the combustion furnace.

1 shows a process for manufacturing a conventional artificial lightweight aggregate using such a fly ash and dredged soil. The conventional artificial lightweight aggregate shown in FIG. 1 is manufactured by crushing the dredged soil and the underfill, respectively. The dredged soil is extracted from a river, lake, or sea by a pump. The water is first dried to a moisture content of 10% or less, and then sent from a dredged hopper 20 to a stone separator 21 to remove the stone. the crusher 22 is used to crush it to 10 mm or less. And then pulverized to a size of about 100 탆 or less by a secondary mill (23).

Separately from the crushing of the dredged soil, the inferiority is supplied from the lower hopper 10 to the crusher 11 and crushed to a size of about 150 탆 or less in the crusher 11, and then the crushed dredged soil and the bottomed crusher are mixed with a mixer 30), moisture is mixed and mixed at a moisture content of about 15%. The mixed raw materials thus mixed are stored in the molding hopper 50 through the yard 40 and then sequentially passed through the molding mixer 55 and the extruder 60 and the pelletizer 70 to form spherical particles After molding, the mixture is fired and foamed in a firing furnace (80) at about 1100 to 1200 degrees to produce an artificial lightweight aggregate.

However, in the conventional artificial lightweight aggregate manufacturing process, the dredged soil and the undercurrent are separately crushed, and then the dredged soil and the undercurrent are mixed with each other and then sent to a molding machine 70 for crushing. (See Fig. 2). In addition, due to the nature of the viscous dredged soil, the dredged soil first collects and the bottoms are adsorbed on the surface thereof, or the bottoms are trapped in the interior, (See FIG. 3), and the problem that the mixing ratio becomes uneven (see FIG. 4).

In the artificial lightweight aggregate, the fineness and mixing ratio of the raw materials have a great influence on the molding, sintering, and foaming efficiency of the aggregate. As a result, the stability of the fine powder and the mixing ratio can not be secured. As a result, / Firing / foamability is poor and it is difficult to secure quality.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a method for producing fine artificial lightweight aggregate through securing the fineness of the raw material mixture and stabilizing the mixing ratio.

The method for producing an artificial lightweight aggregate using the underfill and the dredged soil according to the present invention comprises a crushing step of crushing the underfill and the dredged soil separately using a crusher, a step of transferring the underfill and the dredged crane through the crushing step to the respective storage hoppers And transferring the mixed raw materials from the individual storage hopper to a mixing hopper and transferring the mixed raw materials from the individual storage hopper to a mixing hopper; mixing the mixed raw materials in the mixing hopper with the mixed raw material in the mixed- A step of molding the blended raw materials having passed through the mixing and pulverizing step into a predetermined shape; and a step of firing the blended raw materials having passed through the blending step in a baking furnace, By mixing and pulverizing the undercurve and the dredged soil together in a pulverizer, It is characterized.

Further, in the above crushing step, the loess and the dredged soil are crushed to a size of about 1 mm to 10 mm, preferably 1 mm to 5 mm, and more preferably about 5 mm.

Also, in the step of transferring and mixing the lower and dredged soil to a mixing hopper, the lower and dredged soil are mixed in equal weights.

In addition, in the step of mixing and grinding the blend materials, the blend pulverizer may be configured such that the rotor is rotated at a high speed and the underfill and dredged soil passing between the clearances by the high velocity vortex formed between the liner as the stationary blades And are mixed and pulverized while bombarding each other.

In addition, a feed pipe is provided between the hoppers for forming in the raw material storage tank for storing the raw material mixture discharged from the mixing and crushing unit after the mixing and crushing step, and the raw material mixture is blown and transferred through the transfer pipe by pneumatic pressure .

According to the present invention, there is provided a method for producing high quality artificial lightweight aggregate with improved fine powder and mixing ratio of blended raw materials.

1 is a view showing a conventional artificial lightweight aggregate manufacturing process,
FIG. 2 is a photograph of dredged soil which has been pulverized in the conventional artificial lightweight aggregate production process,
Fig. 3 is a schematic view of the blended raw materials which are unevenly mixed in the conventional artificial lightweight aggregate production process,
FIG. 4 is a photograph of a raw material mixed in a conventional artificial lightweight aggregate manufacturing process,
5 is a photograph of a lightweight aggregate according to a conventional manufacturing process,
6 is a view showing a manufacturing process of an artificial lightweight aggregate according to the present invention,
7 is a photograph of a raw material according to the production process of the present invention,
8 is a photograph showing an artificial lightweight aggregate manufactured according to the present invention,
9 is a cross-sectional view of the mixed pulverizer in the manufacturing process of the present invention,
10 is a plan view of Fig.

Hereinafter, a method for manufacturing a high quality artificial lightweight aggregate according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 6 is a view showing a manufacturing process of the artificial lightweight aggregate according to the present invention, FIG. 7 is a photograph of the raw material according to the manufacturing process of the present invention, FIG. 8 is a photograph showing the artificial lightweight aggregate manufactured according to the present invention FIG. 9 is a cross-sectional view of the mixed pulverizer in the manufacturing process of the present invention, and FIG. 10 is a plan view of FIG.

The method of manufacturing a high quality artificial lightweight aggregate according to a preferred embodiment of the present invention includes a crushing step of separately crushing the underfill and the dredged soil using a crusher, the step of transferring the underfill and the dredged soil having been subjected to the crushing step to individual storage hoppers And transferring the mixed raw materials from the individual storage hopper to a mixing hopper and transferring the mixed raw materials from the individual storage hopper to a mixing hopper; mixing the mixed raw materials in the mixing hopper with the mixed raw material in the mixed- A step of shaping the blended raw materials having passed through the mixing and pulverizing step into a predetermined shape; and a step of calcining the blended raw materials having passed through the blending step. Hereinafter, each step will be described in more detail.

A method of manufacturing an artificial lightweight aggregate according to the present invention is a process for manufacturing a lightweight aggregate using a low-loom and a dredged soil. Referring to FIG. 6, the manufacturing process of the lightweight aggregate will be described. First, the dredged soil and the bottom ash are separately crushed Process. The dredged soil is obtained by draining a muddy soil or the like accumulated in a river, a lake, and the sea by a pump. The dredged soil is first dried to a moisture content of 5% or less, then the dredged soil stored in the dredged hopper 200 is removed through a stone separator 210 Is first pulverized to a size of 1 mm to 10 mm, preferably 1 mm to 5 mm, using a cut mill 220, and pulverized to a size of about 5 mm in the actual process. In the present invention, the pulverizer 220 used in the primary pulverization is not shown in the drawing, but the raw material is charged between the rotary drum cutter and the stationary cutter to be pulverized, and the particle size of the pulverized raw material is controlled by the outlet screen.

In addition, the inferiority is a type of coal ash generated in a thermal power plant, which is pulverized coal which is burned in a combustion furnace and falls to the bottom of a combustion furnace. These ashes are also individually sent from the lower hopper 100 to a cut mill 110 and crushed to a size of 1 mm to 10 mm, preferably 1 mm to 5 mm, in the same manner as the dredged soil in the crusher 110, In the process, it is pulverized to a size of about 5 mm.

According to the present invention, the dredged soil and the undercook are individually crushed into roughly the same roughly 5 mm in the first roughness, and the mixing ratio is improved in the mixing process to be described later.

The crushed dredged soil and the inferred soil are sent to the first crushed dredged soil storing hopper 230 and the lower holding hopper 120 respectively and then discharged from the dredged soil storing hopper 230 and the low- and one tonne is transferred to the mixing hopper 300 by a feeder. Therefore, the dredged soil and the inferior soil are supplied to the mixing hopper 300 at a ratio of 5 to 5, and in the mixed hopper 300, the dredged soil and the inferior soil are mixed using the screw in a dry state without adding water. The thus mixed raw materials are fed to a mixing and crushing machine 400 and subjected to a mixing and pulverizing process.

In the present embodiment, two mixing grinders 400 are provided, and thus the mixing material is supplied to the respective mixing grinders 400 at a rate of 1 ton per hour by two feeders in the mixing hopper.

In the present invention, the mixed pulverizer 400 is used to process ultrafine powder particles by self-pulverizing using high-speed vortex of air and vibration due to high-frequency pressure fluctuation. The rotor having a sawtooth shape is rotated at a high speed, The raw material passing between the gaps is pulverized by the high-speed vortex formed between the gaps of the gaps. 9 and 10, the present invention includes a housing 410, a main shaft 420 disposed vertically in the housing 410, a main shaft 420 disposed on the main shaft 420, An upper and a lower rotor plate 460 horizontally installed on the main shaft 420 in the housing 410 and a pair of upper and lower rotor plates 460 coupled to the outer circumferences of the upper and lower rotor plates 460, A liner 470 disposed perpendicularly to the inner circumferential surface of the housing 410 and disposed on the outer side of each of the rotor blades 465 and a liner 470 disposed below the liner 470 on the inner circumferential surface of the housing 410. [ And a feed screw 450 for feeding the raw material mixture into the housing 410 from the raw material feed hopper 440 and the raw material feed hopper 440. [

When the mixing material is supplied from the mixing hopper 300 to the mixing material supply hopper 410 of the mixing and crushing machine, the mixing material 400 is supplied into the housing 410 by the supply screw 450. The blend material supplied into the housing 410 is pulverized in two stages. First, the rotor blade 465 of the upper rotor plate 460 coupled to the upper side of the main shaft 420 rotates at a high speed while the liner 470 , The blending raw material passing between the gaps is firstly crushed by the high-speed vortex formed between the gaps. The primary pulverized raw material passes between the ring member 480 and the rotor blade 465 and moves downward and the blended raw material moved downward similarly passes through the gap between the lower rotor blade 465 and the liner 470 And further pulverized. In this way, in the mixed pulverizer 400, the raw materials of the undercurve and the dredged soil are pulverized to 100 μm or less and then discharged through the discharge port 490.

As described above, in the present invention, the first rough roughly ground pulverized dredged soil and the sub-pulverized pulp are mixed and pulverized to a particle size of 100 탆 or less in the mixed pulverizer 400. In the mixed pulverization process, The crushing of the dredged soil improves the degree of differentiation of the dredged soil and improves the mixing ratio. Fig. 7 is a photograph of the blended raw material according to the present invention. Unlike the blended raw material photograph of Fig. 4, it can be seen that the blend raw materials have a good and homogeneous blend of fine powders.

The mixing raw material after the mixing and pulverizing process is stored in the mixing raw material storage tank 500 and then sent to the molding storage hopper 600 for the molding process. In the present invention, the molding storage hopper 600 in the mixing raw material storage tank 500, And the pneumatic pressure is transferred to the forming storage hopper 600. More specifically, the blend material is transported from the blend stock tank 500 to the intermediate silo 520 using the blower 510, and then is transported from the silo 520 to the forming storage hopper 600 using the air compressor 550. Therefore, conventionally, there have been problems such as the generation of scattered dust and the loss of raw materials by transporting the raw material mixture from the raw material storage room to the silo through the open conveyor belt and from the silo to the molding storage hopper. However, Such a configuration eliminates such a problem.

Next, the blended raw material carried to the forming storage hopper 600 is subjected to a molding process for molding into a predetermined shape for firing. In the molding process, first, water is added in the molding mixer 650 to knead the raw material mixture, and the kneaded raw material is cut into a predetermined size in the extruder 700 and then discharged. Then, the kneaded raw material is rolled into a spherical shape by a pelletizer 800 And then sent to the post-baking furnace 900.

The spherical blend material sent to the firing furnace 900 undergoes firing and firing processes in the firing furnace 900. The spherical compound material fed into the furnace 900 at one end is slowly heated at about 1150 ° C to 1200 ° C by the combustion heat supplied from the other end of the furnace 900 while moving to the opposite end of the furnace 900, The gas is expanded and foamed, and then discharged to the other end opposite to the firing furnace 900.

After the sintering and firing process is performed in the sintering furnace 900, the sintering furnace 900 is cooled to a finished product. FIG. 8 is a photograph showing an artificial lightweight aggregate manufactured according to the manufacturing process of the present invention, and shows a state where the artificial lightweight aggregate is sintered and foamed as a finished product.

As described above, in the conventional manufacturing process, the dredged soil and the bottom slurry are mixed in a mixer after the crushing process is completed, and then the mixture is subjected to molding and firing. Thus, in the crushing process of the dredged soil, ), And the degree of differentiation is poor. In the mixing process, the dredged soil first collects and the bottoms are adsorbed on the surface thereof, or the bottoms are trapped inside and the dredged soil is wrapped around the outside. In the present invention, the primary mixing ratio is improved by mixing the first-roughly pulverized dredged soil and the low-loom in the similar size as described above, and the low-loom and the dredged soil are mixed and ground together to serve as a sanding agent for the dewatered soil having low viscosity The crushed dredged soil is crushed to improve the degree of differentiation of the dredged soil, and at the same time, Thereby further improving the sum ratio.

In the present invention, the degree of differentiation and mixing ratio of the blended raw materials are improved, and thus the high-quality artificial lightweight aggregate aggregate having a good sintering / .

Conventionally, there have been problems such as generation of scattered dust and loss of raw materials by transporting a raw material mixture from a raw material storage chamber to a silo through an open conveyor belt and transporting the raw material from a silo to a molding hopper. However, The feed pipe is installed from the raw material storage tank 500 to the molding storage hopper 600 for molding and the blended material is conveyed to the pneumatic pressure by using the blower 510 and the air compressor 550 so that the raw material is lost or scattered dust is generated The problem is solved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but many variations and modifications may be made without departing from the scope of the present invention. It will be easily understood.

100: Lower hopper 110: Crusher
120: crushed ash storage hopper 200: dredged hopper
210: Stone separator 220: Crusher
230: crushed dredged soil storage hopper 300: mixing hopper
400: Mixing mill 500: Mixing raw material storage tank
600: forming hopper 650: forming mixer
700: extruder 800: molding machine
900: firing furnace

Claims

A method for producing an artificial lightweight aggregate using ash and dredged soil,
A crushing step of crushing the underfill and the dredged soil individually using a crusher,
Conveying the underfill and the dredged soil having been subjected to the crushing step to respective individual storage hoppers;
Transferring the bottom and dredged soil from the individual storage hopper to a mixing hopper and mixing,
Transferring the blended raw materials mixed in the mixing hopper to a blending mill, mixing and grinding the blending blend in the blending mill,
A step of shaping the blended raw material having passed through the mixing and pulverizing step into a predetermined shape,
And firing the blended raw material having passed through the forming step in a baking furnace,
Wherein the mixing grinder includes a rotor disposed vertically in the housing to rotate at a high speed so that a vortex formed between the rotor and the liner, which is a fixed blade installed on the inner peripheral surface of the rotor, Wherein the fine aggregate and the mixing ratio of the raw material mixture are improved by mixing and crushing the undercurrants and the dredged soil that pass through the slurry so that high quality artificial lightweight aggregate can be produced.

The method according to claim 1,
Wherein the loose and dredged soil is ground to a size of 1 mm to 10 mm in the crushing step.

The method according to claim 1,
Wherein the bottom and the dredged soil are mixed with the same weight in the step of mixing and conveying the bottom and the dredged soil to the mixing hopper.

delete

The method according to claim 1,
Characterized in that a feed pipe is provided between the hopper for forming in the raw material storage tank for storing the raw material mixture discharged from the mixing and crushing unit after the mixing and crushing step and the raw material mixture is blown and fed through the feed pipe by pneumatic pressure, Method of manufacturing aggregate.