KR20020050185A - The method to manufacture break to sand by construction waste - Google Patents

Abstract

PURPOSE: A manufacturing method of crushed sand is provided to achieve the mass production of crushed sand of a uniform high quality by effectively utilizing construction waste and to solve the problem of environmental contamination. CONSTITUTION: The manufacturing method of crushed sand using construction waste consists of a pre-treatment process for obtaining regenerated material comprised of a material input step, a first pulverizing step, a first classifying step, an underwater separating step, a second pulverizing step, a second classifying step, and a third pulverizing step; and an after-treatment process for obtaining final crushed sand comprised of a regenerated material input step, a first classifying step, a first pulverizing step, a second classifying step, a second pulverizing and grinding step, and a third classifying step.

Description

Crushed sand manufacturing method using construction waste {The method to manufacture break to sand by construction waste}

The present invention relates to a method for manufacturing aggregate for construction, and in particular, to produce high quality crushed sand through the recycling process of construction waste.

Aggregate refers to materials such as sand and gravel, which are mixed with cement and water to make mortar or concrete. In the past, it was considered as a simple filler mixed with cement paste mainly for economic reasons. It turns out to have a very big impact.

Generally, river aggregates are ideal as construction aggregates, but due to the excessive collection of natural aggregates since the 1980s, due to the seriousness of ecosystem destruction and various regulations in terms of nature protection, coarse aggregates have been discontinued before 1990 and replaced with crushed stone. Fine aggregates are depleted and pose a threat to the construction industry.

In the case of fine aggregates, in addition to natural resources, aggregate varieties such as crushed sand have been developed to diversify varieties, but crushed sand has poor granular and fine powder content, land sand has clay content, sea sand has salt content, and mountain sand has soft wind. Overall quality is deteriorated due to cargo.

In response, there has been remarkable progress in the use of crushed sand as a fine aggregate in foreign countries such as Japan.However, in Korea, crushed sand (crushed sand) is used despite the fact that coarse aggregates have already been widely used. The development or utilization of the technology is very poor.

Crushed sand, unlike natural sand, refers to fine aggregates made artificially by crushing rocks with crushers.In Korea, crushed sand is produced by the production of crushed stones (by-product having a particle diameter of 8mm or less, which generates about 25-30% of the production). Most of them were used as raw materials.

Recently, due to the lack of natural fine aggregates, it is difficult to obtain raw materials of crushed sand, which is also called crushed stone having a particle diameter of 15-40 mm.

By the way, in the manufacturing process is produced through a number of steps, such as grinding, classification, water treatment, the quality is poor, the quality of the crushed sand produced when there is a slight change in the manufacturing system is showing a very big difference.

Basically, the crushed sand manufacturing system is composed of crushing device and classification device, and it is divided into dry and wet according to the crushing and classification method.

Looking at the specific manufacturing equipment, a feeder (hopper, feeder), conveyor belt, screen, turbidity treatment facility, a control device and, in some cases, a dust collector, a drying device, etc. are required with the crater as the top.

In this case, it is important that each process-specific device can be manufactured according to the purpose and use properly to produce the impure sand of the required quality, and to ensure the uniformity of quality according to the arrangement and circulation path of the selected device. There is a difficult problem.

The present invention is to provide a production method that can produce a uniform and excellent crushed sand by efficiently utilizing the construction waste that can not be recycled and at the same time can not be recycled environmental problems and waste of resources.

To this end, the present invention is characterized in that it is possible to mass-produce while repeating continuously while the front and back processes are configured independently.

The entire process proceeds in the order of raw material input-> 1st crushing-> 1st classification-> Underwater classification-> 2nd crushing-> 2nd classification-> 3rd crushing-> Recycling raw materials production,

The post-process is completed by adding recycled materials-> 1st classification-> 1st crushing-> 2nd classification-> 2nd crushing and polishing-> 3rd classification-> Production of final product (crushed sand).

In the production of crushed sand using construction waste, the process-specific device and circulation path have a great influence on securing the quality and uniformity of the final product. As described above, the present invention proposes a formal system and sequentially Another purpose is to arrange the process equipment of the method so that the flow of the post-process can be smoothly performed.

1 (a) Configuration diagram of the previous step in the present invention, (b) Flow chart

Figure 2 (A) Configuration diagram of the post-process in the present invention, (B) Flow chart

(Description of Major Symbols in Drawings)

1. 11. Dosing device 2. 5. Jaw crusher

3.6.11.13.15. Vibrator Screen

4.Water tank 7.12. Cone Crusher

14.Sand Unit 16.Impact Crusher

The present invention is continuously repeated while the previous and subsequent steps are performed independently.

The entire process proceeds in the order of input of raw materials-> 1st crushing-> 1st classification-> 2nd crushing-> 2nd classification-> 3rd crushing-> recycled raw materials production,

The post-process is completed by adding recycled raw materials-> 1st classification-> 1st crushing-> 2nd classification-> 2nd crushing and polishing-> 3rd classification-> Final product (crushed sand) production.

Although the previous process and the after process is operated separately and independently, in order to achieve the object of the present invention, the post process must be installed by speaking to the previous process.

Screen, which is the main configuration of the present invention, unless otherwise stated, adopts a planar or inclined vibrating diaphragm system, and all are referred to as screens, but are aliased for each step. In addition, the size of the body can be arbitrarily set and adopts wet or dry.

The apparatus used in the present invention is driven by using an electric motor as a power generating device for driving, but a separate engine may be mounted to each device to employ a hydraulic driving motor.

In addition, in the present invention, unless otherwise stated, the device for each process is connected by a conveyer belt, which is a conveying means, and reveals that holes are formed on the conveyor belt to the extent that fine particles are permeated.

I. Preprocess

In the present invention, the entire process is to put the construction waste in the feeder and crush the concrete, waste rocks by jaw crusher (Jaw Crusher), and then to separate and discharge the iron and earth and sediment to the underwater sorting device to remove dust and paper by wet After removing foreign substances such as wood, second and third grinding through jaw crusher and cone crusher, and then sorting by particle size through the screen to produce the first recycled raw materials.

FIG. 1A is a configuration diagram showing a previous process according to the present invention, and FIG. 1B is a flow chart, which will be described in detail with reference to the respective drawings.

First step (material input)

The construction waste is input to the hopper (1) equipped with a vibration feeder using equipment such as a dump truck or a fork crane. At this time, the construction waste is mainly waste concrete or waste-rock, it is possible to selectively input by size.

Second stage (primary crushing)

The input is first crushed in the jaw crusher (2), which is crushed and conveyed to the conveyor belt in this process, which can be recycled out of wood and steel is sorted as a separate device and taken out to the outside, incineration of other difficult to recycle Transported to facility for disposal.

As crushing concrete and waste-rock by jaw crusher, foreign substances such as timber and iron materials and soil are separated and discharged. In the case of earth and sand, fine particles are naturally discharged in the process of conveying to the conveyor belt, and are discharged during the first classification, and the remaining soil is filtered out of the underwater sorting device.

3rd stage (primary classification)

The foreign body, soil and aggregate are classified by the dry sieve vibrating screen (3). At this time, raw materials that do not pass the sieve are put into the jaw crusher, which is a crushing device through underwater treatment, and the soil is separated and To be discharged.

The water treatment apparatus 4 is composed of a water tank 41 and a water collecting tank 42 installed at the bottom of the water tank. The water tank is provided with a separate auxiliary tank for water replenishment, or supplies water through a pump, and installs a separate power device such as a motor and a screw to remove suspended foreign substances. Light waste and foreign substances such as wood, sciropol, etc. are removed from the construction waste put into the water tank 41 by using a motor, such as a separate power unit.

The soil that has been transported in the vibrating screen (3) by the kenveyor belt is submerged in the water tank, and then transported by a screw installed in the water tank to collect in the water collecting tank to settle out of the sedimentary soil to the fork lane or the like.

Aggregate is conveyed to the jaw crusher 5 directly through the water tank 41 through the conveyor belt and is crushed, and coarse aggregate having a particle diameter of 50 mm or more is transferred to the crusher 6, which is the third crusher, to perform the crushing process. Going through.

4th step (secondary shredding)

Aggregate that has undergone the water treatment step is subjected to secondary crushing by the jaw crusher and is conveyed to the secondary screen by a conveyor belt.

5th stage (secondary classification)

Classification is made by the size of aggregate through the dry type vibration screen.

The grain size is adjusted so that more than 50mm of particles cannot pass, and the passed particles are classified into 15mm or less, 25mm or less and 50mm or less by size to be discharged and loaded with conveyor belt.

Meanwhile, aggregate that does not pass through the secondary screen 5 is transferred to the cone crusher 6 to undergo the third crushing and polishing process.

7th step (3rd shredding)

Aggregates that do not pass through the secondary screen 5 are crushed and polished again by the cone crusher 6, and then returned to the screen 5 to undergo a repetitive cycle until the aggregate meets a predetermined standard value.

The finally crushed construction waste is produced by the particle size (13mm or less aggregate, 14-25mm aggregate, 50mm or less aggregate), can be productized according to the needs and uses and discharged to the outside, to meet the purpose of the present invention It is put into the post process for the production of crushed sand.

However, the first to third crushing process is only responsible for a part of the crushing process for producing recycled aggregate, the quality is poor even after the classification is made simply because the process of classifying the crushed concrete by size. In particular, in the forcible crushing process, poor granularity, high mortar adhesion amount, high curb ratio, and fine particles such as cement and sand are attached to the aggregate surface. Therefore, separate reprocessing is required to be used as a high quality crushed sand.

I

I. Post-process

In the present invention, the post process is to improve the granularity and quality of the recycled aggregate crushed in the previous process, and finally to produce a crushed sand of less than 7mm.

Fig. 2 is a process chart showing a post process according to the present invention, with reference to Fig. 2 to illustrate the present invention.

Stage 1 (Material Input)

A vacuum feeder is installed in the iron plate square cone hopper into which raw materials are received. Raw materials produced in the previous process can be selectively added, or they can be added evenly regardless of size. The feeder 1 is connected to a vibrating screen through the conveyor belt to input the material, the aggregate is sorted and then crushed, and after the classification, the cone crusher is disposed on one side of the discharge part of the vibrating screen through the conveyor belt. Connected with

2nd stage (1st classification)

This process is the process before input to the crusher, and determines the size of the body and the capacity of the facility considering the capacity of the production line and the properties of the product.

In the present invention, the injected materials are accommodated in the first vibrating screen 2 and dry classification is performed so that the body takes particles of 13 mm or more. In this process, the fine powder is removed and discharged to the outside through the conveyor. . Aggregates of 13 mm or more in particle size are then transferred to the cone crusher for crushing.

3rd stage (1st shredding)

There are a wide variety of devices for crushing aggregates, the present invention employs a cone-crusher (Cone-Crusher).

In the present invention, the coarse aggregate of 13 mm or more is first crushed by the cone crusher, and is delivered to the second vibrating screen 14.

4th stage (2nd classification)

The aggregates subjected to the first fracture are subjected to the second screen in a wet manner, and have three paths in the secondary classification step.

First, coarse particles larger than 13 mm are screened through the second vibrating screen, re-introduced into the secondary cone crusher, and subjected to crushing again. After crushing, the screen is returned to the third classification along the circulating conveyor belt.

Second, aggregates satisfying a certain particle size are immediately transferred to the third screen for washing, and then the second screen is put into the impact crusher which is provided at one point of the third screen outlet and connected to the conveyor belt. And polishing process.

Third, 3.0 mm or less particles having fine powder removed while passing through the screen are collected by the sand unit and carried out to the product.

5th step (2nd crushing and polishing step)

In the secondary classification, mainly particles between 3-13 mm are transferred to the conveyor belt and shredded to a predetermined value or less through the impact crusher 16. At this time, the granular structure is greatly improved with fracture.

The impact crusher is crushed and polished and then transferred to the third screen 15 for classification.

6th step (3rd classification)

This process is a step that goes through the screen by a wet method, it is divided into three major paths.

First, the crushed sand having a desired size of 7 mm or less transferred from the second vibrating screen may be shipped as a product through an aggregate discharge conveyor belt, but the secondary crushing process of the impact crusher may be performed to improve the standing shape. have.

Second, the granules of 7mm or more go through the crushing and polishing process in the impact crusher for the second crushing, and the shape is greatly improved. After the crushing and polishing, it is circulated to the tertiary screen again and repeats the circulation process until the condition of the particle size is satisfied. It is discharged to the final product.

Third, 3.0 mm or less particles having fine powder removed are collected in a sand unit, which is a sand collecting device, and carried out to a product.

In the above process, particles between 0.08-3.00mm are collected as sand and collected in the sand unit, and transported to the product, and fine powders of 0.08mm or less are collected and treated in a thinner tank.

On the other hand, one of the most important situations in the production of crushed sand is the problem of treating the effluent and fines flowing out from the production process.The effluent causes environmental pollution, so it should not be discharged as it is, but should be purified in its own process and reused. It is necessary to circulate to make this possible.

The fine sand, usually between 0.08 mm and 3.00 mm, collected in the second to third classification stages is collected once in the sand unit and taken out to the product, but the fine powders below are transported to a thicker tank.

The thinner tank is a device for flocculating fine powder, and is equipped with a device for administering a polymer flocculant and a water replenishing and supply device for fine powder treatment and water treatment. A chemical treatment tank is provided separately for the storage and supply of the flocculant. When necessary, the flocculant is pumped to the Seekner tank by using a high-pressure motor, which is a separate power device. At this time, as the flocculant used, polyacrylamide emulsion, aluminum sulfate and the like can be selected.

The fine powder coagulated in the thinner tank is temporarily stored in the fine storage tank. The differential reservoir is a preliminary reservoir for transferring the aggregated fine powder to the filter. The fine powder transferred to the filter press is filtered and discharged to the outside when it becomes a cake state of 8% moisture. The discharge is landfilled in a cake landfill used for fill or cover, or separately prepared.

When 1,500 tons of peconcrete waste is added per day according to the present invention, after the soil (35%) is removed in the previous process, the aggregate is recycled by 10%, 15% and 40% for each 13mm, 25mm and 40mm particle size. Aggregate is produced. In addition, the recycled aggregate is put through a post-process to produce about 975 tons of fine sand less than 7mm per day.

Recycled aggregates can be used in all demands that require aggregates, but ascon aggregates and concrete aggregates require KS standards, so it is necessary to meet these standards.

The standard for the quality of crushed sand in Korea is defined as KS-F-2527 crushed sand for concrete, and its use is indicated as having basalt, andesite, sandstone, limestone and equivalent stone.

In the case of the crushed sand using construction waste according to the present invention, the physical property test results showed that the KS standard items were satisfied as follows.

Table of comparison of test values according to KS standard and present invention

Item / Category Crushed sand (KS-F-2527) Recycled Aggregate for Concrete (KS-F-2523) Test value according to the present invention Drying weight 2.5 or more 2.20 or more 2.40 Absorption rate (%) 3.0 or less 5.0 or less 4.20 stability(%) below 10 · 3.00 Loss amount (%) 7.0 or less 5.0 or less 2.00 % Of performance 53.0 or more 53.0 or more 54.0

(Loss: 0.08mm sieve passage rate)

In particular, the most important of the characteristics of the crushed sand is that the granules are rough, the surface is rough, and there is a possibility of containing a lot of fine particles. Among the above items, the absorption rate, the performance rate, and the fine powder content (loss amount) are the most important factors do.

It can be said that it satisfies the lower limit (more than 53%) of the performance rate, and it is a high quality crushed sand. As a result of the production process according to the present invention, it shows 54% or more, and high quality was determined as crushed sand.

In addition, a large amount of fines are generated during the production of crushed sand, so if it is not removed below a specified value (less than 7% of loss), it will adversely affect the physical properties of the concrete. .

The present invention provides a production method that can produce a uniform and excellent crushed sand by using the construction waste that can not be recycled is an environmental problem and waste of resources efficiently.

In addition, the present invention can be mass-produced while being continuously repeated as the previous process and the subsequent process is configured independently, by presenting a more formal system by the process-specific device and the multi-stage circulation path, the flow of the back and forth process smoothly proceeds In particular, in the post-process, granularity is greatly improved and high-quality crushed sand can be produced.

Claims (3)

In the production system consisting of the front and rear processes of manufacturing crushed sand using construction waste, Pre-process is the first step of injecting the construction waste into the hopper (1) equipped with a vibration feeder using equipment such as dump truck or fork lane; The input is first crushed in the jaw crusher 2, which is a crushing device, and is transferred to the conveyor belt. In this process, the wood and steel materials can be recycled as a separate device, and the other materials are difficult to recycle. Two stages of transportation to a facility for disposal; The foreign body, soil and aggregate are classified by the dry sieve vibrating screen (3). At this time, raw materials that do not pass the sieve are put into the jaw crusher, which is a crushing device through underwater treatment, and the soil is separated and 3 stages are discharged to; Aggregate subjected to the underwater treatment step is the second crushing by the jaw crusher and is carried to the second screen on the conveyor belt; Classification is made by the size of the aggregate through the vibrating screen, the aggregate that does not pass through the secondary screen (5) is transferred to the cone crusher (6) to undergo a third crushing and grinding process; Aggregates that do not pass through the secondary screen (5) are crushed and polished again by the cone crusher (6), and returned to the screen (5) again to go through a cycle repeated process until the aggregate meets a certain reference value And the final crushed construction waste is produced for each particle size, and is commercialized according to needs and uses, and discharged to the outside or put into a post process, In order to improve the granularity and quality of the recycled aggregate crushed in the previous process, the post process may include a material receiving the material into the feeder 1 equipped with a vacuum feeder in the hopper regardless of the size or size of the raw materials produced in the previous process. Stage 1; The input material is accommodated in the first vibrating screen (2) to adjust the body so that the classification is made to take particles of a predetermined size or more, in this process fine powder below a certain standard is removed and aggregates above a certain standard are A second step of transferring to the cone crusher for crushing; The transferred aggregate is first broken into a cone crusher and delivered to the second vibrating screen (14); Aggregate transported to the secondary screen is classified into three main paths. (A) Coarse particles of a predetermined standard or more are selected through the secondary vibration screen and re-introduced into the secondary cone crusher to be crushed again. After the shredding process, the screen is returned to the third sorting along the circulating conveyor belt. (B) Aggregates satisfying the predetermined particle size are immediately transferred to the third screen for cleaning. It is placed in the impact screen crusher which is installed at one point of the third screen outlet and is connected to the conveyor belt to undergo the second crushing and polishing process. A fourth step that is collected by the unit and taken out to the product; Particles transferred from the secondary classification are greatly improved with the crushing process below the predetermined value through the impact crusher 16, and the granular structure is greatly improved, and through the impact crusher, the third screen 15 for the classification through grinding and grinding. A fifth step of transferring to the; Aggregate conveyed to the third screen is classified into three main paths, (a), the crushed sand of a desired size below a predetermined standard conveyed from the second vibrating screen is a product through the aggregate discharge conveyor belt It can be shipped as, but it can go through the secondary polishing process of the impact crusher for the improvement of the standing, (b) the mold is greatly improved by the crushing and polishing process in the impact crusher for the secondary crushing After crushing and grinding, it is circulated to the tertiary screen again and discharged to the final product through the repetitive circulation process until the condition of particle size is satisfied. Crushed sand manufacturing method using building waste including post-processing, which is collected as a sand unit and carried out as a product The method of claim 1, In the third stage (primary classification) of the previous process, coarse aggregates having a particle diameter of 50 mm or more are classified and transferred to the cone crusher 6, which is the third crushing device, to undergo a crushing process. In the 5th step (secondary classification), the grain size is adjusted so that more than 50mm particles cannot pass, and the passed particles are classified into 15mm or less, 25mm or less, and 50mm or less, so that they can be discharged and loaded into the conveyor belt. In the second stage of the post process (primary classification), the body is caught with more than 13mm of particles, in the process, the fine powder is removed, aggregates of more than 13mm in size are transferred to the cone crusher for crushing, In the 4th step (secondary classification), three kinds of particle sizes are classified into three paths. (A) Coarse particles larger than 13 mm are screened through the screen, re-introduced into the secondary cone crusher, and then crushed again. Is returned to the screen for the third classification along the circulating conveyor belt, and (b) aggregates satisfying the particle size between 3 and 13 mm are immediately transferred to the third screen for cleaning. It is provided at one point of the outlet screen of the car screen and put into the impact crusher connected to the conveyor belt to undergo the second crushing and polishing process. Collected by the product and taken out to the product, In the sixth step (tertiary classification), three kinds of particles are classified into three paths. (A) Crushed sand of desired size of 7 mm or less can be shipped to the product through an aggregate discharge conveyor belt. Secondary grinding process of impact crusher can be carried out. It is discharged to the final product through the repetitive circulation process until the condition of the particle size is satisfied. (C) The fine particles less than 3.0mm are collected in the sand unit, which is a sand collecting device. Crushed sand manufacturing method using construction waste, characterized in that exported to. The method according to claim 1 or 2, The fine sand, usually between 0.08mm and 3.00mm, collected in the classification stage of the post process is collected in the sand unit and taken out as a product. The fine powders are temporarily stored in the fines storage tank and then transferred to the filter, and when the cake is in the state of 8% moisture after filtration, the method for producing crushed sand using construction waste including the process of discharging to the outside