CN115180855A

CN115180855A - Method for producing sand by using heterogeneous sandstone

Info

Publication number: CN115180855A
Application number: CN202210612397.4A
Authority: CN
Inventors: 杨丹涛; 李小峰; 张静; 李宜田; 吴莉
Original assignee: Sinohydro Corp Engineering Bureau 15 Co Ltd
Current assignee: Sinohydro Corp Engineering Bureau 15 Co Ltd
Priority date: 2022-05-31
Filing date: 2022-05-31
Publication date: 2022-10-14
Anticipated expiration: 2042-05-31
Also published as: CN115180855B

Abstract

A method of producing sand from heterogeneous sandstone, comprising the steps of: step 1, a primary crushing process; step 2, a middle crushing process; and step 3: fine crushing; and 4, step 4: a screening process; and 5: adding water and finely crushing; step 6: washing, dehydrating and blending; the wet production process is adopted in the steps, so that dust in the production process can be reduced, mud and the like mixed in stone materials can be washed, the washed fine sand is recycled by using a fine sand recycling machine and mixed with a product six, but the recycled fine sand has strong water retention property and is still packed in a lump after being dehydrated on the fine sand recycling machine, so that a crushing device is arranged at a discharge port of the fine sand recycling machine, and a dewatering screen is arranged after the fine sand and the coarse sand are mixed in order to uniformly mix the recycled fine sand and the coarse sand; the sand produced by the method can be directly transported to a mixing system for producing concrete without manual intervention or equipment intervention, so that the occupation and consumption of personnel and equipment are reduced, and the automation of the whole system is realized.

Description

Method for producing sand by using heterogeneous sandstone

Technical Field

The invention belongs to the technical field of building sand screening devices or equipment, and particularly relates to a method for producing sand by using heterogeneous sandstone.

Background

Sand is an important constituent of construction concrete materials. The machine-made sand is formed by crushing stone powder in a screening system, and has two processes of dry production and wet production. The material source of the stone field is distributed unevenly, the lithology is mainly heterosandstone and mudstone, the heterolamellar mudstone is in a interbedded shape, the mudstone content is relatively high, the bedding joint develops, the rock mass is broken, the rock mass is mainly from strongly-weakly-weathered upper zone rock mass, and the rock mass is locally weakly-weathered lower zone rock mass. The sandstone has the phenomena of 'sand formation', structural development, obvious interlayer squeezing and crumpling phenomena and rock mass breakage, and adopts a wet production process. The screening system for wet production mainly comprises a vibrating feeder, a coarse crushing jaw crusher, a middle crushing cone crusher, a fine crushing cone crusher, a sand making machine, a circular vibrating screen, a sand dehydration linear vibrating screen, a fine sand recovery system, an adhesive tape machine, a finished aggregate bin and the like; washing crushed stone with water in the process of producing sand, washing fine sand, mud, fine powder and the like in the stone, then recovering and dehydrating the fine sand collected in a fine sand pool by using a fine sand recovery system, and uniformly stirring the fine sand and coarse sand to prepare qualified sand.

In the existing wet production process of a screening system, due to the fact that raw materials are strong in water retention, large in mud content, low in rock hardness, large in viscosity and the like, after dehydration is carried out on a fine sand recovery device, the water content of sand is still large, the fine sand recovered from a machine outlet is flaky or agglomerated, and after the fine sand is mixed with coarse sand, a powder wrapping phenomenon exists, so that the local fine sand content is high, indexes such as the stone powder content, the fineness modulus and the like are large in fluctuation, the sand quality is unstable, equipment such as a crusher is fast in abrasion, the fault frequency is high, the maintenance time is long, the stone powder content of the sand is high, the water content is large, the efficiency is low, the system operation control difficulty is large, the economic investment is high, and the quality is unstable. In order to solve the problem, mechanical equipment or personnel intervention is needed, equipment is maintained periodically, equipment parts are replaced at high frequency, sand recovered by the fine sand recovery machine is repeatedly stirred, sand lumps are loosened, equipment and personnel are increased, production efficiency is reduced, and economic benefits are affected.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the defects of the prior art and provide a method for producing sand by heterogeneous sandstone, which has simple flow, does not need manual or equipment intervention, reduces the occupation and consumption of personnel and equipment, and realizes the automation of a complete set of system.

The technical scheme for solving the technical problems is as follows: a method of producing sand from heterogeneous sandstone, comprising the steps of:

step 1, a primary crushing process: sending the raw material with the particle size of more than 100mm after blasting into a jaw crusher for coarse crushing to obtain a product I;

step 2, a medium crushing process: conveying the first product to a vibrating screen by a vibrating feeder and a belt conveyor for soil removal screening, conveying the material which is screened out and is larger than 80mm of screen holes of an upper layer screen of the vibrating screen to a middle crushing cone by the belt conveyor for crushing, conveying the crushed product to the vibrating screen again by the belt conveyor for secondary screening to obtain a second product which is smaller than 80mm of screen holes of a lower layer screen of the vibrating screen;

and 3, step 3: fine crushing process: the second product is sent into a fine crushing conical crusher by a vibrating feeder and a belt conveyor to be finely crushed to obtain a third product;

and 4, step 4: a screening process: conveying the product III into a sieving machine by a belt conveyor for sieving to obtain a product IV with the particle size of 5-20 mm;

and 5: adding water and finely crushing: conveying the product IV to a vertical crusher by a belt conveyor for fine crushing, wherein a water feeding pipeline is required to be arranged on a crushing cavity of the vertical crusher because the product IV has large mud content and certain cohesiveness, and a small amount of water is added into the crushing cavity through the water feeding pipeline to prevent a rotor from being locked; conveying the finely-crushed product IV to a vibrating screen on a belt conveyor for three-stage screening to obtain a product V with the particle size of less than 5 mm;

step 6: washing, dehydrating and blending: and a product V enters a spiral sand washer through a rubber belt conveyor to be cleaned to obtain a product VI, the cleaned product VI enters a primary dewatering screen to be dewatered, fine powder output by the spiral sand washer is introduced into a fine sand recovery tank to be recovered, the fine sand recovered in the fine sand recovery tank needs to be introduced into the primary dewatering screen by a fine sand recovery machine to be blended according to a proportion due to low stone powder content, but the recovered fine sand has strong water retention property, and is still assembled in a lump after being dewatered on the fine sand recovery machine, so a crushing device is arranged below a discharge port of the fine sand recovery machine, after the sand lump is crushed, the crushed sand lump and the dehydrated product VI are uniformly stirred and blended on the dewatering screen to form a product VII, and the product VII is conveyed to a finished product sand silo by a belt conveyor to be stockpiled.

The raw material of the invention is mauve sandstone, and the stock ground is a heterogeneous stock ground in which soft rocks such as mudstone and the like are mixed.

The steps 1-4 of the invention adopt a wet production process, namely, a spraying system is additionally arranged at the discharge end of the belt conveyor in the process.

In the

steps

2 and 3 of the invention, an iron removing device is additionally arranged on the belt conveyor.

The crushing device of the invention is as follows: a hopper is arranged below a discharge port of the fine sand recycling machine, the hopper is positioned right above the belt conveyor, one end of a screen is horizontally arranged on the inner side wall of the hopper, the upper part of the other end of the screen is connected with the machine body of the fine sand recycling machine through at least two first springs, the lower part of the other end of the screen is connected with the inner side wall of the hopper through at least two second springs, and a protective net is arranged between the hopper and the discharge port of the fine sand recycling machine.

A ladder stand structure is arranged at one end, close to the hopper, of the fine sand recycling machine body.

An overhaul platform is arranged between the protective net and the hopper and connected with the ladder stand structure.

One end of the screen is hinged on the inner side wall of the hopper.

One end of the screen is arranged on the inner side wall of the hopper through a hinge.

Compared with the prior art, the invention has the following advantages:

1. the invention adopts a wet production process, and the rotary spray head is arranged at the discharge end of the belt conveyor, so that the dust in the production process can be reduced, and mud and the like mixed in stone materials can be washed.

2. The invention uses a fine sand recovery machine to recover washed fine sand and mix the washed fine sand with a product six, but the recovered fine sand has strong water retention property, and is still agglomerated after being dehydrated on the fine sand recovery machine, so a crushing device is arranged at a discharge port of the fine sand recovery machine, one end of a screen is hinged on the inner side wall of a hopper, a certain rotation angle between the screen and the hopper is ensured, the other end of the screen is fixed on a machine body and the hopper through a spring, the vibration of the fine sand recovery machine is ensured to be transmitted to the screen, power is provided for the screen, sand agglomerates or flaky fine sand produced by the fine sand recovery machine are processed through the vibration of the screen, the flaky or agglomerated fine sand vibrates on the screen until the flaky or agglomerated fine sand is loosened and then enters a belt conveyor through the screen, the fine sand recovered by the device does not need to be stirred by using equipment or manual intervention, after the loosened fine sand and other semi-finished sand are mixed, the grading of the sand is continuous, the stone powder content and the fineness modulus are stable, and the quality reaches the standard.

3. In order to uniformly blend the recovered fine sand and coarse sand, a dewatering screen is arranged after the fine sand and the coarse sand are mixed, so that the sand can be continuously dewatered during the movement process, and the blended sand can be uniformly mixed.

4. The sand produced by the invention can be directly pulled and transported to a mixing system for producing and using concrete, manual work or equipment intervention is not needed, the occupation and consumption of personnel and equipment are reduced, and the automation of a whole set of system is realized.

Drawings

FIG. 1 is a process flow diagram of the present invention.

Fig. 2 is a schematic structural view of the fine sand reclaimer of fig. 1.

Fig. 3 is a top view of fig. 2.

Fig. 4 is a cross-sectional view of fig. 2.

In the figure: 1. a belt conveyor; 2. a hopper; 3. a second spring; 4. screening a screen; 5. a second spring; 6. a protective net; 7. a fine sand reclaimer; 8. a ladder climbing structure; 9. overhauling the platform; 10. and (7) a hinge.

Detailed Description

The present invention will be described in further detail with reference to the following drawings and examples, but the present invention is not limited to these examples.

Example 1

In fig. 1, the invention relates to a method for producing sand from heterogeneous sandstone, comprising the following steps:

step 1, a primary crushing process: sending the raw material with the particle size of more than 100mm after blasting into a jaw crusher for coarse crushing to obtain a product I; the material is purple red sandstone, the stock ground is a heterogeneous stock ground, soft rocks such as mudstone and the like are mixed, and the rock has strong water-retaining property and certain viscosity.

and step 3: fine crushing process: the second product is sent into a fine crushing conical crusher by a vibrating feeder and a belt conveyor to be finely crushed to obtain a third product;

and 4, step 4: the screening process comprises the following steps: conveying the product III into a sieving machine by a belt conveyor for sieving to obtain a product IV with the particle size of 5-20 mm;

and 5: a water adding fine crushing process: conveying the product IV to a vertical crusher by a belt conveyor for fine crushing, wherein a water feeding pipeline is required to be arranged on a crushing cavity of the vertical crusher because the product IV has large mud content and certain cohesiveness, and a small amount of water is added into the crushing cavity through the water feeding pipeline to prevent a rotor from being locked; conveying the finely-crushed product IV to a vibrating screen on a belt conveyor for three-stage screening to obtain a product V with the particle size of less than 5 mm;

step 6: washing, dehydrating and blending: and a product V enters a spiral sand washer through a rubber belt conveyor to be cleaned to obtain a product VI, the cleaned product VI enters a first-stage dewatering screen to be dewatered, fine powder output by the spiral sand washer is introduced into a fine sand recovery tank to be recovered, wherein the fine sand recovered from the fine sand recovery tank needs to be introduced into the first-stage dewatering screen by a fine sand recovery machine to be mixed in proportion due to low stone powder content, but the recovered fine sand has strong water retention property, and is still packed in a lump after being dewatered on the fine sand recovery machine, so a crushing device is arranged below a discharge port of the fine sand recovery machine, the crushed sand lump is uniformly mixed with the dewatered product VI on the dewatering screen to form a product VII, and the seven product VII is conveyed to a finished product sand silo by a belt conveyor to be stockpiled.

The sludge content of the product I, the product II and the product III obtained by crushing in the steps 1-4 is large, so a wet production process is adopted, namely, a spraying system is additionally arranged at the discharge end of the belt conveyor in the process. And 2, additionally arranging an iron removal device on the belt conveyor in the step 3.

The crushing device of this embodiment is by belt feeder 1, hopper 2, second spring 3, screen cloth 4, second spring 5, protection network 6, machine 7 is retrieved to fine sand, cat ladder structure 8, overhaul platform 9, hinge 10 is connected and is constituted, install hopper 2 through screw fastening connecting piece fixed connection below the discharge gate of machine 7 is retrieved to fine sand, hopper 2 is located belt feeder 1 directly over, hopper 2 is upper and lower open-ended toper structure, 2 upper portion feed inlets length of hopper and fine sand are retrieved machine 7 discharge gate phase-match, the fine sand that machine 7 was retrieved to fine sand produced all enters into in the hopper 2. The one end level of screen cloth 4 articulates on the inside wall of hopper 2, and the one end of this embodiment screen cloth 4 is passed through hinge 10 and is installed on the inside wall of hopper 2 for screen cloth 4 has certain turned angle relative to hopper 2, guarantees that the vibrations of machine 7 are retrieved to fine sand drive the screen cloth vibration, and the installation quantity of hinge 10 is confirmed according to the length of screen cloth 4. The upper part of the other end of the screen mesh 4 is connected with the machine body of a fine sand reclaimer 7 through at least two first springs 5, the lower part of the other end of the screen mesh 4 is connected with the inner side wall of the hopper 2 through at least two second springs 3, fine sand groups or flaky fine sand reclaimed by the fine sand reclaimer 7 fall onto the screen mesh 4 of the automatic screening device from a discharge port, a part of the fine sand groups collide and loosen with the screen mesh 4 under the action of gravity, the vibration of the fine sand reclaimer 7 is transmitted to the screen mesh 4 through the first springs 5 and the second springs 3 to drive the screen mesh 4 to vibrate, so that the other part of the sand groups or flaky fine sand groups are loosened and reach the belt conveyor 1 through the screen mesh 4, the first springs 5 and the second springs 3 play a role in transmitting power on one hand and playing a role in damping and limiting on the other hand to prevent the screen mesh 4 from vibrating and displacing too much, the installation quantity of the first springs 5 and the second springs 3 is determined according to the length of the screen mesh 4, and the installation positions of the first springs 5 and the second springs 3 on the screen mesh 4 correspond to each other hand. Install protection network 6 between the discharge gate of machine 7 is retrieved to hopper 2 and fine sand, and protection network 6 is used for preventing that sand material from spattering outward, and further, it installs cat ladder structure 8 through screw thread fastening connecting piece fixed connection to be close to 2 one end of hopper on the machine 7 fuselage is retrieved to fine sand, installs maintenance platform 9 between protection network 6 and the hopper 2, and maintenance platform 9 is connected with cat ladder structure 8, and operating personnel gets into maintenance platform 9 through cat ladder structure 8 and overhauls the operation. This device is through the slope extension fine sand ejection of compact speed of adjusting 7 discharge gates of fine sand reclaimer, adjusts 7 feed inlets of fine sand reclaimer size adjustment of fine sand and retrieves the volume that the fine sand was retrieved, increases the dehydration time of fine sand, reduces the moisture content of fine sand.

Claims

1. A method of producing sand from heterogeneous sandstone, comprising the steps of:

2. A method of producing sand from heterogeneous sandstone according to claim 1, wherein: the raw material is mauve sandstone, and the stock ground is a heterogeneous stock ground in which soft rocks such as mudstone and the like are mixed.

3. A method of producing sand from heterogeneous sandstone according to claim 1, wherein: the steps 1-4 adopt a wet production process, namely, a spraying system is additionally arranged at the discharge end of the belt conveyor in the process.

4. A method of producing sand from heterogeneous sandstone according to claim 1, wherein: and (3) additionally arranging an iron removal device on the belt conveyor in the step 2.

5. A method of producing sand from heterogeneous sandstone according to claim 1, wherein the crushing means is: be provided with hopper (2) below the discharge gate of machine (7) is retrieved to fine sand, hopper (2) are located belt feeder (1) directly over, the one end level of screen cloth (4) sets up on the inside wall of hopper (2), the other end upper portion of screen cloth (4) is connected with the fuselage of machine (7) is retrieved to fine sand through two piece at least first springs (5), the lower part is connected with the inside wall of hopper (2) through two piece at least second springs (3), be provided with protection network (6) between the discharge gate of machine (7) is retrieved to hopper (2) and fine sand.

6. A method for producing sand from heterogeneous sandstone according to claim 5, characterized in that the fine sand reclaimer (7) has a ladder structure (8) on its body near the end of the hopper (2).

7. A method for producing sand from heterogeneous sandstone according to claim 5, characterized in that an inspection platform (9) is arranged between the protective screen (6) and the hopper (2), the inspection platform (9) being connected to the ladder structure (8).

8. A method for producing sand from heterogeneous sandstone, according to claim 5, characterized in that the screen (4) is hinged at one end to the internal side wall of the hopper (2).

9. A method for producing sand from heterogeneous sandstone, according to claim 8, characterized in that one end of the screen (4) is mounted on the internal side wall of the hopper (2) by means of hinges (10).