JPH10211441A - Demolishing separation method for waste concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To separate and recover an aggregate to be used as a regenerated aggregate from a waste concrete. SOLUTION: Crushed pieces 10 after crushing coarsely a waste concrete 9 are further crushed while applying the vibration by a vibration type jaw crusher 3 to separate an aggregate 25 from a cement hydrate 26. A mixture of the separated aggregate 25 with the cement hydrate 26 is screened into large and small grain particles by a separator 4, and then dry gravity separated by two vibration separators 5 and 6, and the aggregate 25 and the cement hydrate 26 are recovered separately.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for dismantling and separating concrete waste material for mainly separating and recovering aggregate from waste concrete material for reuse.

[0002]

2. Description of the Related Art In the case of recovering aggregate from concrete waste, conventionally, for example, a docle type jaw crusher,
By roll crusher, impact crusher, etc.
After coarsely crushing concrete waste material, to remove cement hydrate adhering to the aggregate, use a milling machine using a docle type jaw crusher, or after passing through a rod mill or ball mill, A method such as performing wet processing is employed.

[0003]

However, in the case of the above method, the cement hydrate adhering to the aggregate cannot be sufficiently removed only by roughly crushing the waste concrete, and the water absorption rate is 3%. Since it can not be used as recycled aggregate before and after, it is made to perform milling and wet treatment after coarse crushing, but even if it is milled with a milling machine, recycled aggregate with a water absorption rate of about 3% can be used. It takes time to manufacture,
Aggregate cannot be separated and recovered efficiently, and when wet treatment is performed after passing through a rod mill or ball mill, a water treatment device for hydrated sludge generation is required.
When using a rod mill, the aggregate itself cracks,
There is a problem that a lot of stone powder is generated. Therefore, conventionally, the obtained aggregate can only be used for roadbed materials, backfill materials, and the like.

Accordingly, the present invention is to provide a method for dismantling and separating concrete waste which can efficiently separate and recover aggregate that can be used as recycled aggregate in a dry manner without causing cracks in the aggregate itself. It is assumed that.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a method for crushing crushed pieces of concrete waste material by further crushing the crushed pieces while applying vibration to the cement hydrate. Then, a mixture of the aggregate and the cement hydrate is subjected to dry specific gravity sorting to separate the aggregate and the cement hydrate.

When the crushed pieces generated by roughly crushing the concrete waste material are further crushed while applying vibration, cracks are formed at the boundary between the aggregate and the cement hydrate adhering to the aggregate. Since the cement hydrate can be generated, the cement hydrate can be separated from the aggregate without causing cracks in the aggregate, and the aggregate can be easily separated and collected by dry-type specific gravity separation.

Further, if the mixture of the aggregate and the cement hydrate is sieved to a large or small particle size before the specific gravity selection,
The separation of the aggregate and the cement hydrate can be performed more easily.

[0008] Further, the fine powder of cement hydrate generated during the time from the coarse crushing of the concrete waste material to the dry specific gravity separation of the aggregate and the cement hydrate is supplemented by a dust collector, thereby supplementing the fine powder. The hydrated concrete hydrate powder can be used as a soil conditioner or the like.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the working steps of the method for demolition and separation of concrete waste material according to the present invention. The crushed pieces generated by roughly crushing the concrete waste material are further crushed while applying vibrations to separate them from the aggregate. A crushing separation process part A for separating cement hydrate, and a mixture of aggregate and cement hydrate is subjected to dry fluidized bed specific gravity sorting to collect and collect aggregate and cement hydrate. And a sorting and collecting step B.

FIG. 2 shows the outline of the equipment used for carrying out the method for dismantling and separating concrete waste material in the above-mentioned working process. The rough crushing stage I having a crusher 1 and the rebar removing stage II having a magnet conveyor device 2 are shown. Separation stage II equipped with a vibration type jaw crusher 3
I, a sieving stage IV having a separator 4, a sorting stage V having two vibration separators 5, 6, and a dust collecting section VI having a hood 7 and a dust collector 8 covering each stage.
Consists of

As the crusher 1 of the coarse crushing stage I, a known jaw crusher is adopted so that the concrete waste material 9 put in can be largely divided.

The magnet conveyor device 2 of the rebar removing stage II is configured so that the rebar can be adsorbed and removed by the magnet 12 from between the crushed pieces 10 of the concrete waste material 9 placed on the conveyor 11.

The vibration type jaw crusher 3 used in the hydrate separation stage III has a structure as shown in FIG. That is, the frame 14 having the central portion opened is elastically supported via the spring 16 on the support 15 on the base 13, and the base 14 and the frame 14 are supported.
The upper and lower jaw plates 17 are arranged between the right and left jaw plates 17, and the upper ends thereof are swingably supported by the torsion bar 18 at the opening of the frame 14. The closing plate 19 to be closed is attached to the frame 14, and further, an imbalanced load 20 is attached to the left and right back surfaces of the left and right jaw plates 17,
An eccentric shaft 21 is mounted on the unbalanced load 20 and the eccentric shaft 2
1 is connected to a motor 23 via a flexible coupling 22, and the motor 23 is driven (for example, 1500 per minute).
Rotation), the flexible coupling 22, the eccentric shaft 21,
By vibrating the right and left jaw plates 17 via the unbalanced load 20, the crushed pieces 10 put between the right and left jaw plates 17 through the hopper 24 are crushed to form aggregate 25 and cement hydrate 26. It is made to separate.

[0015] The separator 4 of the sieving stage IV comprises:
A large-mesh (for example, 15 mm) sieve 27 and a small-mesh (for example, 5 mm) sieve 28 are provided in upper and lower layers so that the particle size of the aggregate 25 and the cement hydrate 26 can be sieved into large and small. It is.

The vibrating separator 5 of the sorting stage V
No. 6 has the same configuration and performs dry sorting using a sand medium. That is, as shown in FIG. 4, the outlet of the casing 29 is connected to the upper outlet 30 and the lower outlet 3.
1 and 2 into the casing 29 together with the sand 33 and the entrance 3
The mixture of aggregate 25 and cement hydrate 26 supplied from 2 is selected up and down by specific gravity while flowing while giving vibration to the outlet side, and the upper layer outlet 30 and the lower layer outlet 3 are selected respectively.
1 to be collected by being separated from the
The sand 33 falling together with the cement hydrate 26 is recovered through a fine mesh wire mesh 34 so as to be recycled.

In the dust collecting section VI, a cyclone is employed as the dust collector 8 to supplement the fine cement hydrate powder 34 generated in each stage.

Hereinafter, using the equipment having the above configuration,
The procedure for dismantling and separating the concrete waste material 9 will be specifically described.

First, in the coarse crushing stage I, a large lump of concrete waste material 9 is put into the crusher 1 and is roughly divided into crushed pieces 10 having a diameter of about 50 mm or less. Next, in the reinforcing bar removal stage II, the reinforcing bars mixed in the concrete waste material 9 before the coarse crushing are removed from the crushed pieces 10 by the magnet conveyor device 2. Thereafter, in the hydrate separation stage III, the crushed pieces 10 from which the rebar has been removed are put into the vibrating jaw crusher 3, and the crushed pieces 10 are further crushed while applying vibration. At this time, if vibration is applied simultaneously with the impact force so as not to break the aggregate 25 itself, the milling effect can be sufficiently exerted, so that a crack is formed at the interface between the aggregate 25 and the cement hydrate 26. It is easy to enter and peel off.

The separated aggregate 25 and the cement hydrate 26
Is then sieved to large and small particle sizes in sieving stage IV. In this case, the aggregate 25 and the cement hydrate 26 are put on the upper sieve 27 having a large mesh so that the aggregate 25 and the cement hydrate 26 having the same particle size can be easily sorted in the downstream sorting stage V. Then, as they fall down, the aggregate 25 and the cement hydrate 26 having a small particle size are allowed to fall through the upper sieve 27 onto the lower sieve 28 so that the particle size can be sorted into large and small. I do. The powder 35 dropped through the lower sieve 28 is separately collected. Subsequently, the mixture of the aggregate 25 and the cement hydrate 26 sieved to a large or small particle size is separated into the aggregate 25 and the cement hydrate 26 in the sorting stage V and collected. In this case, those having a large particle size are put into the vibration separator 5 and those having a small particle size are put into the vibration separator 6, and the aggregate 25 and the cement hydrate 26, each having the same particle size, are sorted by specific gravity. As a result, the aggregate 25 and the cement hydrate 26 can be easily separated and collected.

Further, each of the stages I, II, III, I
V, Fine cement hydrate powder generated during work in V 34
Is supplemented by a cyclone as the dust collector 8 in the dust collecting section VI.

In the above, the vibration type jaw crusher 3
Aggregate 2 that has been separated from the crushed pieces 10 by the
Since No. 5 does not undergo wet treatment, a water treatment device for generating hydrated sludge is not required, and since no rod mill or ball mill is used, the aggregate 25 is less likely to crack. It can be easily recovered as about 3% recycled aggregate, and the cement hydrate 26 can be recovered as a roadbed material, a backfill material, or the like. Furthermore,
The cement hydrate fine powder 34 supplemented by the dust collector 8 can be used as a soil improving material.

In the above embodiment, the case where the jaw crusher is used as the crusher 1 of the coarse crushing stage I has been described, but the vibration type jaw crusher 3 used in the hydrate separation stage III is used. It goes without saying that various changes may be made without departing from the spirit of the present invention.

[0024]

As described above, according to the method for dismantling and separating concrete waste material of the present invention, the following excellent effects are exhibited. (1) The crushed pieces generated by coarsely crushing the concrete waste material are further crushed while applying vibration to separate the cement hydrate from the aggregate, and then mixed with the aggregate and the cement hydrate. Since the aggregate is separated from the cement hydrate by dry specific gravity sorting of the material, the cement hydrate can be separated from the aggregate without using a rod mill, ball mill, or wet processing device, and recycled. Aggregate can be easily collected without cracks. (2) Separation of aggregates and cement hydrates more easily by sieving the mixture of aggregates and cement hydrates into large and small particle sizes before specific gravity selection. Can be. (3) Supplemented cement by using a dust collector to capture fine cement hydrate powder generated during the coarse crushing of concrete waste material and during the dry specific gravity separation of aggregate and cement hydrate. Hydrate fines can be used as soil conditioners.

[Brief description of the drawings]

FIG. 1 is a work process diagram of a method for dismantling and separating concrete waste material of the present invention.

FIG. 2 is a schematic diagram showing an example of equipment used for carrying out the method of the present invention.

FIG. 3 is an enlarged view of a vibration type jaw crusher.

FIG. 4 is an enlarged view of a vibration separator.

[Explanation of symbols]

 A Crushing and Separation Process Section B Sorting and Recovering Process Section I Coarse Crushing Stage II Rebar Removal Stage III Hydrate Separation Stage IV Sieving Stage V Sorting Stage VI Dust Collection Unit 3 Vibrating Jaw Crusher 4 Separator 5, 6 Vibration Separator 8 Dust Collection Container 9 Concrete waste material 10 Fragment 25 Aggregate 26 Cement hydrate 34 Cement hydrate fine powder

Claims (3)

[Claims] 1. A crushed piece produced by coarsely crushing concrete waste material is further crushed while applying vibration to separate cement hydrate from aggregate, and then the aggregate and cement hydrate are separated from each other. A method for dismantling and separating concrete waste material, characterized in that aggregates and cement hydrates are separated by dry-type specific gravity sorting of the mixture. 2. The method for dismantling and separating concrete waste according to claim 1, wherein a mixture of aggregate and cement hydrate is sieved to a large or small particle size before being subjected to specific gravity selection. 3. The fine dust of cement hydrate generated during the period from the time of coarse crushing of waste concrete to the time of dry specific gravity separation of aggregate and cement hydrate is captured by a dust collector. 3. The method for dismantling and separating concrete waste material according to 2.