JP2006137624A - Method of manufacturing artificial sand for ready-mixed concrete from crushed stone powder and manufacturing apparatus therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing an artificial sand for ready-mixed concrete from crushed stone powder which is made possible to regenerate a crushed stone powder having an average particle size of 3.5 mm or smaller as an artificial sand for ready-mixed concrete, and a manufacturing apparatus therefor. <P>SOLUTION: In the method and the apparatus, a hydrated crushed stone powder having an average particle size of 3.5 mm or smaller is sucked into a jet water flow, transferred, while being polished, to collide with a partition plate 51, reduced in pressure, kneaded and polished, then fed to a sieving screen 6 to separate crushed stone particles of an average particle size of 3.5 mm or larger to be carried out, and a slurry including crushed stone particles of an average particle size of 3.5 mm or smaller is fed into a primary cyclone 9 to be separated into a solid component of a particle size of 3.5 mm-0.075 mm and a mud component containing fine particles of 0.075 mm or smaller, then the solid component is dehydrated to be carried out as the artificial sand for ready-mixed concrete, the mud component is fed into a secondary cyclone 15 to be centrifugally separated into the fine particles of particle size of 0.075 mm or smaller and the mud water component, and the fine particles are dehydrated to be carried out, and the mud water component is transferred for another use as a dehydrated cake. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for producing artificial sand for ready-mixed concrete from fine crushed stone powder, which is difficult to perform by ordinary washing and sorting, and a production apparatus therefor.

A crushed stone plant that produces crushed stone and crushed sand for roads and construction (architecture), etc., puts stones of about 1m size blasted at the quarry site into a raw material factory (crushing chamber) upstream of the plant, and uses a crusher. Crushing and sieving according to the particle size of the crushed stone with a sieve, repeatedly crushing and sieving and sorting out large non-standard crushed stones, and finally shipping crushed stones and crushed sand that have been crushed and sorted according to standard particle sizes as products However, a sand making facility that produces fine aggregate (crushed sand) with a particle size of 5 mm or less is installed downstream of the plant, and the crushed product is washed with water to remove adhered mud and unnecessary fine stone particles for the purpose of improving product quality. Although it was to be washed, the fine aggregate for concrete (crushed sand) has a limited content of fine stone particles of 0.075 mm or less contained in the product. For removing stone particles While washing of the following crushing products particle size 5mm has been performed, the production yield of the fresh concrete sand is not sufficient, mud component for transferring so-called dewatered cake had many drawbacks.
JP 2001-122647 A

In the present invention, a fine crushed stone powder having an average particle size of 3.5 mm or less, which is treated as a surplus product at a quarry as so-called No. 0 crushed stone (commonly called stone powder), can be regenerated as artificial sand for ready-mixed concrete for ready-mixed concrete. A method for manufacturing artificial sand and a manufacturing apparatus therefor are provided.
Moreover, this invention provides the method and manufacturing apparatus which manufacture artificial sand for ready-mixed concrete which can manufacture artificial sand for ready-mixed concrete rapidly from this stone powder with a sufficient yield.

The method for producing artificial sand for ready-mixed concrete from the crushed stone powder of the present invention, as shown in FIG. 1, sucks a crushed stone powder having an average particle size of 3.5 mm or less into a jet water stream, as shown in FIG. Slurry containing particles of crushed stone having a particle size of 3.5 mm or less, transferred to a sieve plate after being transported while being polished, subjected to decompression, kneading, and polishing, put into a sieve screen and carrying out crushed particles having a particle size of 3.5 mm or more In a primary cyclone and separated into solids with a particle size of 3.5 mm to 0.075 mm and mud containing fine particles with a particle size of 0.075 mm or less by centrifugation and polishing, and the solids are dehydrated and carried out In addition, the mud is put in a second cyclone and centrifuged, separated into fine particles having a particle size of 0.075 mm or less and mud moisture, and the fine powder is dehydrated and transported, and the mud moisture is removed from the dehydrated cake. It is to transfer to the application.
Moreover, the apparatus which manufactures the artificial sand for ready-mixed concrete from the crushed stone powder of this invention flows in high-pressure water from one side port 41, as shown in FIG.1, FIG.2 and FIG.3 in order to achieve the said subject. At the same time, crushed stone powder is supplied from the hopper 1 of the upper port 43 together with water supply to create a jet water stream mixed with the crushed stone powder, and a jet flow generator 4 for jetting the crushed stone powder together with the jet water stream from the other side port 42, and a jet water stream The crushed stone powder mixed and transferred to the partition plate 51 is made to collide with the partition plate 51 to perform decompression, kneading and polishing, and the slurry liquid containing crushed stone particles flowing out of the partition plate device 5 Screen device 6 for sieving into crushed stone particles and slurry liquid containing crushed stone particles of a certain particle size or less, conveyor 10 for carrying out the crushed stone particles of a certain particle size or more that have been sieved, and a slurry containing crushed stone particles of a certain particle size or less A feed pump 8 that transfers the liquid to the inlet 91 of the primary cyclone 9, a primary cyclone 9 that centrifuges a slurry liquid containing crushed stone particles of a certain particle size or less into solids and mud, and a primary cyclone. The dehydrating screen 61 for draining the solid content separated in 9, the conveyor 11 for carrying out the solid content drained by the dehydrating screen 61, and the second cyclone by adding the mud separated in the primary cyclone 9 15, a feed pump 14 that transfers to the solid cyclone 15, a secondary cyclone 15 that separates the mud into fine solids and mud moisture, a dewatering screen 16 that drains the fine solids separated by the secondary cyclone 15, and a dehydration screen 16 comprises a conveyor 17 for carrying out the fine solids drained by 16 and a mud tank 18 for collecting mud moisture separated by the secondary cyclone 15.

According to the present invention, first-class artificial sand for ready-mixed concrete is produced using so-called No. 0 crushed stone (commonly called stone powder), which has been generated as a surplus product in a quarry, and the production equipment of the present invention is complete. It is a closed system and does not generate any waste. The mud moisture that is left and processed last is also used separately as a dehydrated cake.
In addition, the present invention can produce high-quality primary sand comparable to natural sand quickly and with high yield, and the production cost is low.

  In the present invention, first grade sand for ready-mixed concrete is produced from crushed stone powder having a particle size of 3.5 mm or less.

An embodiment of the present invention is shown in FIGS.
No. 0 crushed stone (commonly called stone powder) is hydrated by the water supply pump 3 and fed from the hopper 1 through the upper port 43 of the jet flow generating device 4.
The jet flow generating device 4 includes a nozzle 411 at one side port 41, and the pressure water flowing in from the side port 41 by the high-pressure drive pump 2 is ejected from the nozzle 411, whereby a negative pressure is applied to the upper port 43 that is a suction port. Aggregate that is generated through the upper port 43 by generating a suction force is sucked, transported and washed, and discharged from the other side port 42 together with the jet water flow. However, air is naturally discharged from the air inlet 412 near the nozzle 411. The suction prevents the occurrence of cavitation and surrounds the jetted pressure water so that it is discharged from the side port 42 via the inner tube 421.
The jet generating device 4 has a structure free of protrusions such as an impeller like a general pump, so that the jet generating device 4 is not clogged and communicates with the discharge port of the side port 42 when the upper port 43 serving as a suction port is closed. Closing can be easily released by closing the discharge valve and backwashing.
The crushed stone powder discharged from the jet flow generating device 4 flows into the partition plate device 5 together with the jet water flow. The introduced raw material (No. 0 crushed stone) collides with the partition plate 51, repeats kneading, is polished (secondary polishing), and then flows into the sieving screen 61. The selected crushed stones having a particle size of 3.5 mm or more are dehydrated, carried out of the machine by the conveyor 10 and piled up. Slurry containing crushed stone particles of 0.33.5 mm or less flows into the foot sump 7 which is a tank for adjusting the concentration, and the slurry liquid whose concentration is adjusted passes through the foot sump 8 to the inlet 91 of the cyclone 9. Is flowed into.
The cyclone 9 is different from a general wet cyclone in that the end of a pipe 931 communicating with the overflow port 93 is inserted into the seal tank 12 and sealed with water, and a check valve 94 is provided in the underflow port 93 to provide a primary cyclone. By installing the main body 9 at a high position, a siphon function works on the overflow pipe 931 and the inside of the main body 9 is maintained at a negative pressure. Inside the main body 9, the supplied slurry liquid containing crushed stone of 3.5 mm or less is separated into mud and solid by a centrifugal force and washed. Further, in the main body 9, friction between particles is generated and polishing (secondary polishing) is performed, and the classified, washed, and polished solid matter is put into the dehydration screen 61 from the underflow port 92, and the product conveyor 11 It is taken out of the machine and piled up as high-quality first-class artificial sand.
On the other hand, the mud moisture containing the classified fine particles flows into the seal tank 12 from the overflow port 93, is stirred by the stirrer 13 for preventing precipitation and accumulation, and is the same structure as the primary cyclone 9 by the feed pump 14 for fine particles. The fine powder of 0.075 mm or less, which is supplied to the inlet 151 of the secondary cyclone 15 and centrifuged, is dehydrated from the underflow port 152 by the dehydration screen 16 and then carried out of the machine by the conveyor 17 and stacked there. . In addition, fine powder with a particle size of 0.075 mm or less can be mixed with artificial sand under a certain amount of restriction. The centrifugally separated mud moisture flows into the seal tank 18 from the overflow port 153 through the pipe 1531 and is directed to another use as a dehydrated cake.

  In the present invention, so-called No. 0 crushed stone (commonly called stone powder), which has been conventionally treated as a surplus product, is manufactured as a first-class product of artificial sand for ready-mixed concrete, and will be used in the industry in the future.

It is explanatory drawing which showed the outline | summary of the manufacturing method and manufacturing equipment of this invention. It is explanatory drawing of the jet flow generator used for FIG. It is explanatory drawing of the cyclone used for FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hopper 2 High pressure drive water pump 3 Water supply pump 4 Jet generator 41 Side port of jet generator 411 Nozzle of jet generator 42 Side port of jet generator 412 Air inlet of jet generator 43 Upper port of jet generator 5 Partition plate device 51 Partition plate device partition plate 6 Screen device 61 Screen device dewatering screen 7 Feed sump 8 Feed pump 9 Primary cyclone 91 Primary cyclone inlet 92 Primary cyclone underflow port 93 First Next cyclone overflow port 931 Pipe of the first cyclone overflow port 10 Conveyor 11 Conveyor 12 Seal tank 13 Stirrer 14 Feed pump 15 Second cyclone 151 Secondary cyclone inlet 152 Secondary cyclone underflow port 153 1st Pipe 16 dewatering screen 17 conveyor 18 mud tank overflow port 1531 overflow port of the second cyclone of the next cyclone

Claims (2)

  Hydrolyzed crushed stone powder with an average particle size of 3.5 mm or less is sucked into a jet water stream, transferred while being polished, collided with a partition plate, subjected to decompression, kneading, and polishing, and put into a sieve screen to give a particle size of 3.5 mm or more A slurry containing crushed stone particles having a particle size of 3.5 mm or less is put into a primary cyclone, and a solid content having a particle size of 3.5 mm to 0.075 mm and a particle size of 0.075 mm or less are obtained by centrifugation and polishing. In addition to dehydrating and transporting the solid content, the mud content is put into a secondary cyclone and centrifuged to separate the fine particles having a particle size of 0.075 mm or less and mud moisture. The method for producing artificial sand for ready-mixed concrete from crushed stone powder is characterized in that the fine powder is dehydrated and transported, and the mud moisture is transferred to another application of the dehydrated cake. High-pressure water is allowed to flow from one side port 41 and crushed stone powder is added from the hopper 1 of the upper port 43 together with water supply to create a jet water stream mixed with the crushed stone powder, and crushed stone powder from the other side port 42 together with the jet water stream. A jet generating device 4 for jetting, a partition plate device 5 that collides with the partition plate 51 with the crushed stone powder mixed and transferred to the jet water stream, and performs decompression, kneading and polishing, and crushed stone particles that have flowed out of the partition plate device 5 A screen device 6 for sieving a slurry liquid containing a crushed stone particle having a predetermined particle size or more and a slurry liquid containing a crushed stone particle having a particle size of less than a certain particle size, and a conveyor 10 for carrying out the crushed stone particle having a certain particle size or more. The feed pump 8 for transferring the slurry liquid containing crushed stone particles of a certain particle size or less to the inlet 91 of the primary cyclone 9, and the slurry liquid containing the crushed stone particles of a certain particle size or less are separated into solids and mud. The primary cyclone 9 to be separated, the dewatering screen 61 for draining the solid content separated by the primary cyclone 9, the conveyor 11 for carrying out the solid content drained by the dehydration screen 61, and the primary cyclone 9 The feed pump 14 that hydrates the separated mud and transfers it to the second cyclone 15, the second cyclone 15 that separates the mud into fine solids and mud moisture, and the second cyclone 15. A dewatering screen 16 for draining fine solids, a conveyor 17 for carrying out the fine solids drained by the dewatering screen 16, and a mud tank 18 for collecting mud moisture separated by the secondary cyclone 15. A device for producing artificial sand for ready-mixed concrete from crushed stone powder.

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