JPH03101855A - Pumice treating plant - Google Patents

Abstract

PURPOSE:To remove only pumice from raw stone and to obtain product sand having a wide range of grain diameters by passing the raw stone contg. pumice and having a specified grain diameter through a first flight separator, a vibrating screen and a second flight separator to classify the raw stone. CONSTITUTION:The heavy sand deposited on the first flight separator 6 and having about 1-6mm diameter is dipped up by a bucket and discharged onto a belt conveyor 12. Meanwhile, the pumice having <= about 6mm diameter and heavy sand having <= about 1mm diameter overflowing along with water are supplied to the vibrating screen 7 and classified, and the pumice having 1-6mm diameter is heaped via a belt conveyor 8. The pumice and heavy sand having <= about 1mm diameter are introduced into the second flight separator 9, the heavy sand having about 0.15-1mm diameter is discharged onto the belt conveyor 12 via the belt conveyor 11 and mixed with the previously discharged heavy sand to obtain the product heavy sand S having about 0.15-6mm diameter which is heaped. The overflowing pumice having <= about 1mm diameter and heavy sand having <= about 0.15mm diameter are further supplied to the classifier 10 and separated from water.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is a pumice stone that classifies gravel, sand, etc. from raw stone, removes pumice contained in the sand, and extracts only sand with a predetermined particle size. Regarding treatment plants.

(Previous technology) In plants that remove gravel and sand to be mixed into fresh concrete, it is important to remove pumice from the sand.

Conventional pumice removal equipment drops sand mixed with pumice into running water and sorts it out using the difference between the settling speed of pumice and the settling speed of sand.

(Problems to be Solved by the Invention) However, the above-mentioned conventional plant has a drawback in that it removes even relatively small diameter sand together with pumice. In particular, the sand used for ready-mixed concrete must be within a certain range (for example, 0.15 la/w-
If the sand does not have a mixture of particle sizes of 6 Ill/II1), the finish of the finished concrete will be unfavorable, so sand with a relatively wide range of particle sizes is required.

(Means for Solving the Problems) A structure characterized by the present invention includes a receiving hopper that sorts out rough stones with a predetermined particle size or less from raw stones mixed with pumice, and a receiving hopper that sorts rough stones with a predetermined particle size or below that are sorted by the receiving hopper. a first flight separator into which a mixture of pumice and heavy sand of small particle size sorted by the trommel is introduced; A vibrating sieve into which pumice and heavy sand of a predetermined diameter that overflowed the first flight separator are introduced, and a second flight separator into which pumice and heavy sand with a predetermined particle size or less that have been sorted by the vibrating sieve are introduced. and a belt conveyor for conveying heavy sand of a predetermined particle size or less that has been precipitated and sorted by the second flight separator and heavy sand of a predetermined particle size that has been precipitated and sorted by the first flight separator. This makes it possible to obtain product sand with a relatively wide particle size range.

(Example) Hereinafter, an example of the present invention will be described with reference to the attached system diagram.

The rough stone A is passed through a reception hopper 1 having a mesh of 100 to/+nth mesh, and only gravel and sand with a diameter of 100 Io/]rl or less are sorted out and fed to a belt conveyor 2. The belt conveyor 2 feeds the selected gravel and sand to the trommel 3. Trommel 3 has a 50+II/to opening and a 6III/In mesh inside, and carries gravel at 100 tn/m diameter -50
m/m diameter large gravel B and 50 ml +n diameter ~ G
Vn / +n diameter small gravel C and further 6 m
This is to select sand D with a diameter of /+n or less. The large gravel B is discharged from the end of the trommel 3 and is piled up, and the small gravel D is conveyed by the belt conveyor 4 and piled up.

The trommel 3 is provided with a pipe 5 through which water is showered. This shower of water absorbs and removes dust, and at the same time, the sorted sand D is transferred to the first 7 lights by the water flow. It is conveyed to the valet 6.

The sorted sand D is a mixture of pumice with a diameter of 6 m/+n or less and commonly used sand (hereinafter referred to as heavy sand) with a diameter of 6 m/+n or less.

The first flight separator 6 is a device that performs sorting using the difference in sedimentation speed in flowing water. That is, a rotatable drum 6 is disposed inside the sedimentation tank 61, and helical blades 63 are provided on the left and right sides of the drum 62 to transfer the sediment to the drum 6.
is provided. A packet for scooping up and discharging sediment is provided on the outer periphery of the drum 6■.

Sand D is introduced into the settling tank 6 together with water, and the introduced water overflows the settling tank Fff6 and flows out from the left and right sides. Now, if the residence time of the introduced water in the settling tank 61 is set appropriately, pumice with a light specific gravity and heavy sand with a heavy specific gravity but a small particle size will overflow together with the water.

Then, only heavy sand with a large particle size settles to the bottom of the alff6. Experiments have shown that when pumice with a diameter of 6 m/+n or less is overflowed, heavy sand with a diameter of 1n+/ω or less is overflowed together. In addition, Flight Severator 6
In order to control the sorting by adjusting the amount of water introduced into the chamber, an adjustment bomb 6P is provided.

6 + Il/ pumice with a diameter of less than m and 1
Heavy sand with a diameter of m/'Ifi or less is introduced into a vibrating sieve 7 having a 1+n/m mesh, and is passed through the vibrating sieve to separate pumice with a diameter of 6m/m to 1llI/1l and 1+n/m.
It is sorted into pumice and heavy sand with a diameter of m or less. 6 m/
Pumice with a diameter of tn to IIff/IIl is conveyed by belt conveyor 8.
are transported and piled up. Pumice and heavy sand having a diameter of 1+o/+n are introduced into the second flight separator 9.

The $2 flight separator 9 has the same structure as the first flight separator 6, and the $2 flight separator 9 separates pumice with a diameter of 1rn/rn or less and heavy sand with a diameter of 0.15+++/1l or less. and overflow, 1+
n/m diameter - 0. 1 5 to/+n diameter heavy sand is precipitated. Overflowing pumice with a diameter of 1 m/m or less and 0
．． 15 m/ Heavy sand with a diameter of 15 m or less is poured into a classification allowance 10, and the precipitated heavy sand with a diameter of lm/+n -0.15 m/+n is scooped up by a bucket and discharged to a belt conveyor 11. Note that 9P is an adjustment pump for adjusting the amount of water introduced into the flight separator 9 of the f52.

The heavy sand with a diameter of 6m/IIl to 1+a/a+ that has settled on the first flight separator 6 is scooped up by a packet and discharged to the belt conveyor 12, and the heavy sand on the belt conveyor 11 of the second flight separator 9 is also the same. They are discharged to the belt conveyor 12, where they are mixed and piled up as product heavy sand S. The belt conveyor 12 is showered with water for cleaning as needed to remove any mixed 0. The water is discharged and stored in a storage tank 13 together with heavy sand having a diameter of 15 to/+n or less.

0.0 of the storage Wl13. Heavy sand having a diameter of 1 5 +n/ +n or less is introduced into the classified rock 10 by the pump 13P.

Classified rock 10 is made of pumice with a diameter of 1 + n / tI + or less and 0.
It is used to classify and remove heavy sand with a diameter of 15In/Ill or less, and 1+ selected by this classification m10.
Pumice with a diameter of n/+n or less and heavy sand with a diameter of 0.15 m or less are discharged into a pile 82. Further, the waste water from the classifier 10 is introduced into a settling tank 14, where mud is removed by settling.

The supernatant water of the settling tank 14 is pumped to the pipe 5 by a pump 14P1.
The water is showered onto the trommel 3 via the trommel 3, and onto the belt conveyor 12 as required. Pump 1 for sedimentation mud
It is sent to the sewage treatment equipment 15 by 4P2, and after dehydration,
Will be disposed of.

In the above description, the sorted particle size is just an example, and can be changed as necessary. For example, the particle size sorted by the flight separator is changed by changing the amount of water in the adjustment pump. Further, other changes in particle size can be made by changing the mesh size.

(Effects of the Invention) According to the present invention described above, the following effects are achieved.

Since only the pumice is removed from the raw stone, the production amount can be increased.

Since a wide range of heavy sand can be obtained, concrete products with a good finish can be obtained.

When water is used in a closed cycle, wastewater is not discharged to the outside, resulting in a clean treatment device.

If a regulating pump is provided, the particle size to be precipitated can be controlled.

BRIEF DESCRIPTION OF THE DRAWINGS The figure is a system diagram showing an embodiment of the present invention. A: Raw stone 1: Reception hopper 2: Belt conveyor 3: Trommel 34: Belt conveyor 5: Piping 6: Brother 1's flight separator 7: Vibrating) 8:
Belt conveyor 9: Second flight separator 10: Classifier 11: Belt conveyor 12: Belt conveyor 13: Storage tank 1
4: Sedimentation tank 15: Sewage treatment equipment

Claims (1)

[Claims] A reception hopper that sorts out rough stones with a predetermined particle size or less from the raw stones mixed with pumice, a trommel that sorts the rough stones with a predetermined particle size or less that are sorted by the reception hopper into three types of particle sizes: large, medium, and small; A first flight separator into which a mixture of pumice and heavy sand of small particle size sorted by a trommel is introduced, and pumice and heavy sand of a predetermined diameter that overflowed the first flight separator are introduced. a second flight separator into which pumice and heavy sand with a predetermined particle size or less that have been sorted by the vibrating sieve are introduced; a belt conveyor that conveys sand and heavy sand of a predetermined particle size that has been precipitated and sorted by the first flight separator;
A pumice processing plant characterized by comprising: