CN104096401B - Gravel in separation drip washing repairing polluted soil generation slime water, the equipment of humus and separation method thereof - Google Patents

Abstract

The invention discloses a device for separating, rinsing and repairing polluted soil to produce gravel and humus in mud water and a separation method thereof, belonging to the field of contaminated soil repairing equipment. The equipment includes frame, nylon screen support, nylon screen screen, mud water receiving hopper, feed hopper, spring seat tube support, gravel and humus discharge hopper, vibrator and vibrator base; The vibrator is welded on the nylon sieve screen support through the base of the exciter; several pieces of nylon sieve screen are laid flat on the nylon sieve screen support in a detachable fixed manner; a feed hopper is arranged on the top of the frame A mud water receiving hopper is welded on the bottom surface of the frame, and a mud water discharge pipe is arranged at the lower end of the mud water receiving hopper; a gravel and humus discharge hopper is arranged on the side of the nylon screen mesh support. The invention can effectively screen humus and gravel with particles smaller than 2mm from mud water, and has simple operation and low energy consumption.

Description

Equipment and separation method for separating, rinsing, and repairing grit and humus in mud water produced by polluted soil

technical field

The invention belongs to the field of contaminated soil remediation equipment, and more specifically relates to a device and a separation method for separating sand, gravel and humus in mud water produced by leaching and remediation of contaminated soil.

Background technique

When the water-carrying graded treatment is carried out on the contaminated soil, the contaminated soil is often screened according to the composition of the contaminated soil. According to the particle size, the large-grained stones (particle The diameter range is 2-10mm) These components that are not easy to be polluted can be removed and discharged up to the standard after simple washing. This process can be realized by traditional vibrating screening equipment.

Ordinary vibrating screens have high vibration intensity, and the smaller the screen aperture, the thinner the screen thickness and the shorter the service life. Therefore, it is impossible to install a small-aperture screen on an ordinary vibrating screen. It will soon break due to excessive vibration intensity. Ordinary vibrating screens have almost no effect on fine sand (particle size range 0.2-2mm). Even if a high-strength and small-aperture screen is used, when the vibrating screen is used as a primary screening machine, a large amount of fine sand will be generated during use. These fine sand will block the screen and cause the screen to fail. In severe cases, the discharge hopper at the back will crack or even fall off at the connection with the vibrating screen due to serious material accumulation.

Ordinary vibrating screens are coarse screening equipment with large processing capacity and high power consumption. The noise generated when the equipment is working is also very large, and the screening effect is poor.

The mud water separated by traditional vibrating screening equipment still contains a lot of gravel and humus in the original soil. Humus has a small specific gravity and often floats on muddy water. It will pass through the electromagnetic valves, pressure gauges, flowmeters, flow transmitters, pressure transmitters, liquid level gauges and other instruments and equipment on the pipeline as the muddy water is transported. These instruments, meters and equipment are likely to be blocked by humus, causing these devices to fail, or even damaged, which will cause the entire system to be shut down for maintenance, replacement of instruments, meters or equipment due to these failures. These losses are very large.

The gravel will cause great wear and tear on the blades and pump casings of the pumps used for subsequent slurry water transportation, and may deposit in the valves and pipes that pass through the subsequent slurry water treatment process, and even cause blockage, resulting in subsequent water treatment. The system cannot operate; the gravel may also block the instruments or equipment such as solenoid valves, pressure gauges, flow meters, flow transmitters, pressure transmitters, and liquid level gauges on the pipeline, causing the entire system to Malfunction or instrument damage.

Due to the compact structure of the gravel, pollutants cannot enter the interior of the gravel, and there are few pollutants attached to the surface, which can reach the standard after simple washing treatment; due to the fluffy structure of the humus, it is easy to adsorb pollutants, even after subsequent water treatment. It is difficult to remove pollutants, but it is easy to remove pollutants through incineration. In order to ensure the normal operation of the follow-up water treatment system, prolong the service life of the instruments and equipment on the water treatment equipment, reduce and reduce the load of the later water treatment, and reduce the repair cost, it is very necessary to separate the above substances from the mud water.

In order to facilitate engineering application, the components selected for the separation equipment are required to be simple in structure and low in cost, and the existing mud-water separation equipment needs to be further improved. At present, most of the mud-water separation equipment adopts conventional vibrating screen (201310622223.7), plate and frame filter press (patent number: 201320127471.X; 201220629837.9), centrifugal separation (201020541928.8), chemical flocculation and sedimentation (201210052332.5), gravity separation equipment (201220640577.5), etc. These equipments are mainly aimed at the separation of mud, oil and suspended solids in mud water. But in the present invention, it is aimed at the separation of humus and grit in mud water. Through plate and frame filter press (due to the low solid-liquid ratio in soil washing mud, generally less than 1:4, the efficiency of plate and frame filter press is also low for this type of mud separation efficiency), conventional vibrating screen (noisy, easy to block, energy High consumption), dosing flocculation (humus cannot be separated), gravity separation (humus cannot be separated), centrifugal separation (gravel will damage the separation blade) and other separation methods cannot realize the separation of gravel and humus in the contaminated soil leaching repair mud water.

There is a patent for solid-liquid separation using a vibrator (application number: 201310222246.9), which is a separation equipment mainly for shield mud and a vibrating screening equipment under pressure. Its purpose is to realize the separation of mud and water. The present invention is aimed at the separation of gravel and humus in the mud, and the separated mud needs to be further processed. It is a kind of separation under no pressure, low energy consumption, simple structure (adjustable vibration frequency, convenient replacement of sieve plates, and The plate structure is stronger and more durable than traditional screens), and it is easy to operate.

Contents of the invention

1. Technical problems to be solved

Aiming at the problem that traditional vibrating screening equipment cannot finely screen humus and gravel with particles smaller than 2mm in mud water, and these substances cannot be washed to remove pollutants, the present invention provides a method for separating, rinsing, and repairing polluted soil. Equipment for gravel and humus in mud water and its separation method. The equipment and method can effectively screen out humus and gravel with particles smaller than 2mm from mud water, and have simple operation and low energy consumption.

2. Technical solution

The purpose of the present invention is achieved through the following technical solutions.

Equipment for separating, rinsing and repairing polluted soil to produce grit and humus in mud water, which includes rack, nylon sieve screen support, nylon sieve screen, mud water receiving hopper, feed hopper, spring seat tube bracket, gravel and The humus discharge hopper also includes a vibrator and a vibrator base;

The nylon sieve screen bracket is welded on the frame through a vibrating spring and a spring seat tube, and the spring seat tube bracket is fixed on the frame;

The vibrator is welded on the nylon sieve screen support through the base of the exciter; several pieces of the nylon sieve screen are laid flat on the nylon sieve screen support in a detachable fixed manner ; A feed hopper is arranged on the top of the frame, and the feed hopper is welded on the frame by a feed hopper support; a mud water receiving hopper is welded on the bottom surface of the frame, and the mud water The lower end of the receiving hopper is provided with a mud water discharge pipe, and the mud water collected by the mud water receiving hopper is discharged through the mud water discharge pipe; a gravel and humus discharge hopper is provided on the side of the nylon sieve screen support for discharging The gravel is collected and discharged.

Preferably, the vibration mode of the vibrator is high-frequency small-amplitude vibration (double amplitude 5-6 mm). The purpose of high-frequency and small-amplitude vibration is to accurately separate the gravel and humus in the soil washing repair mud, save energy, and prevent materials from being ejected from the separation equipment due to excessive vibration amplitude, causing secondary pollution to the environment. The vibrator uses the principle of resonance, the two-mass body works in a critical resonance state, the required driving power is small, there is no large starting current when starting, and the noise is low; there are no rotating parts and no lubricating oil is required; while the sieve body vibrates, the sieve There is also relative vibration between the sieve bars of the sheet, and the gap between the sieve sheets is not easy to block.

Preferably, the vibration frequency of the vibrator is adjusted by adjusting the frequency converter connected to the frequency conversion motor, and the vibration frequency range of the vibrator is 2000-3500 times/minute. The electric control system is provided with a frequency converter to adjust the vibration frequency of the exciter. According to different working conditions, select the corresponding vibration frequency to achieve the best separation effect.

Preferably, the vibration frequency of the vibrator is 2850 times/minute.

Preferably, according to the particle size of the gravel and humus that need to be separated, choose nylon sieve screens with different meshes:

Choose a 65-mesh nylon sieve to separate sand and gravel with a particle size greater than 0.25mm and humus with a particle size greater than 0.25mm in the mud water;

Choose a 50-mesh nylon sieve to separate sand and gravel with a particle size greater than 0.355mm and humus with a particle size greater than 0.355mm in the mud water;

A 45-mesh nylon sieve plate is selected to separate sand and gravel with a particle size greater than 0.4mm and humus with a particle size greater than 0.4mm in the mud water.

Preferably, the bracket angle of the nylon screening mesh plate is adjustable. The purpose of the adjustable bracket angle is to improve the separation efficiency and increase the optimal output per unit screening area.

The separation method of the equipment for producing grit and humus in mud water by adopting the separation and rinsing restoration of polluted soil, the steps are:

(A) Start the vibrator, and the whole nylon sieve screen support starts to vibrate in a small range at high frequency, driving all the nylon sieve screens fixed on the nylon sieve screen support to vibrate together;

(B) The slurry water is transported to the feed hopper of the separation device through pipelines, and in the feed hopper, the slurry water reaches the liquid level height basically consistent through the action of water flow;

(C) Mud water evenly enters the nylon sieve screen through the small holes on the side of the feed hopper; under the action of gravity, soil particles and water smaller than the aperture of the nylon sieve screen are collected into the mud through the mud water receiving hopper at the bottom of the frame In the water discharge pipe, it flows out of the separation equipment;

(D) Soil particles, gravel, and humus remaining on the nylon sieve screen that are larger than the pore size of the nylon sieve screen, under the vibration of the nylon sieve screen, push these materials down and convey them, and make the nylon sieve screen Soil particles with close mesh apertures are in a vibrating state, so they cannot enter the small holes on the nylon sieve mesh;

(E) Soil particles, gravel, and humus that are larger than the pore size of the nylon screen are pushed to the gravel and humus discharge hopper, and flow out of the separation device under the action of gravity.

3. Beneficial effect

Compared with the prior art, the present invention has the advantages of:

(1) The technical solution of the present invention adopts refined screening to remove grit and gravel that can be discharged up to the standard after simple cleaning and washing and humus that cannot remove pollutants by water treatment, and then reduce the amount of muddy water. , reducing the post-water treatment load;

(2) The technical scheme of the present invention adopts the nylon sieve net plate with certain order number, sieves and removes gravel, humus these can produce the material that damages instrumentation, provides strong guarantee for the water treatment process of the back, prolongs The service life of the equipment used in the subsequent water treatment system is extended, and the probability of blockage of the water treatment system and equipment damage is greatly reduced;

(3) technical scheme of the present invention adopts the high-frequency small amplitude vibration of exciter, and according to the difference of mud water composition, selects the nylon sieve screen plate of different mesh numbers for use, the gravel of different particle sizes, humus are separated from mud water; As the core of the separation equipment, the nylon sieve screen has been vibrating at high frequency and small range. Soil particles with a similar aperture to the nylon sieve screen seldom fall into the holes of the nylon sieve screen. Even if they fall, they will be vibrated out to prevent Nylon screening screens are blocked; the nylon screening screens are fastened together through male and female grooves, and each nylon screening screen is fixed on the bracket by bolts, spring washers, and wing nuts to prevent nylon screening The stencil is detached from the bracket;

(4) In the technical solution of the present invention, the motor of the exciter adopts a variable frequency motor, and the electric control system is equipped with a frequency converter, and the vibration frequency of the exciter can be adjusted by adjusting the frequency of the frequency converter on the operation interface of the electric control system;

(5) The technical scheme of the present invention adopts the nylon sieve screen as a separation tool, and the nylon sieve screen is processed and formed by mold pouring, the raw materials are relatively cheap, and the processing method is also easy to realize. The nylon sieve screen Has reached standardization, and has a certain market supply, and the cost is low enough;

(6) Equipment Since only the exciter is the operating equipment, and the vibration unit is flexibly connected to the entire frame, the failure rate of these guaranteed equipment is very low. Since the exciter and spring are mature products in engineering, the quality It is easy to guarantee, so the equipment can run stably for a long time, and there is basically no failure during use;

(7) The angle of the nylon sieving component can be adjusted according to the different materials to be separated, so as to obtain the optimal separation output and effect per unit sieving area;

(8) By adopting the method of the present invention, the grit and humus are separated from the polluted soil leaching mud, so as to ensure the continuity of the subsequent polluted soil rinsing repair process. Remove the enriched and polluted humus, and greatly reduce the workload of rinsing through incineration. Remove the gravel to ensure the stability and life of the subsequent soil washing equipment. The device has simple operation, low noise, adjustable vibration frequency and serialized sieve plates. You can change the parameters and replace the sieve plate according to the actual needs to achieve better separation effect.

Description of drawings

Fig. 1 is the equipment front view of the present invention;

Fig. 2 is a left side view of Fig. 1 .

In the figure: 1. Nylon screening screen support; 2. Rack; 3. Vibration spring; 4. Spring seat tube; 5. Mud water discharge pipe; 6. Mud water receiving hopper; 7. Feed hopper bracket; 8. Feed hopper; 9. Vibrator; 10. Base of vibrator; 11. Spring seat tube support; 12. Gravel and humus discharge hopper; 13. Nylon screen plate.

detailed description

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example 1

A set of soil washing repair equipment, including contaminated soil belt conveyor, wet three-layer vibration screening equipment, stone cleaning production line, gravel cleaning production line, mud water secondary screening equipment (that is, the equipment of the present invention), recycling Water pipeline, mud water treatment system, mud water separation equipment, water treatment system for separated water, electric control system, etc. The polluted soil is transported to the wet three-layer vibrating screening equipment through the belt conveyor, and the stones larger than 10mm in the upper layer are screened out and cleaned. The second layer of gravel with a particle diameter of 5-10mm and the third layer of gravel with a particle diameter of 2-5mm enter the gravel cleaning production line for cleaning. The mud water (including gravel, humus, etc. with a particle diameter of less than 2mm) screened out of the third layer enters the buffer tank, and after being stirred, it is transported to the mud water secondary screening equipment by the slurry pump. The mud water secondary screening equipment is the technical solution of the present invention. The specific structure is introduced as follows.

1 and 2, the mud water secondary screening equipment of the present invention has a total length of 4.5 meters, a total width of 2.8 meters, and a total height of 2.3 meters. Equipment includes:

4 sets of spring devices, each set of spring devices includes a spring seat tube 4 and a vibrating spring 3, and the nylon screening screen support 1 is welded on the frame 2 through the vibrating spring 3 and the spring seat tube 4;

One group of nylon sieve mesh panels 13. According to the particle size of the gravel and humus to be separated, choose nylon sieve screens with different meshes: choose 65 mesh nylon sieve screen 13 to separate sand and gravel with a particle size greater than 0.25mm and humus with a particle size greater than 0.25mm in the mud water ; Select 50-mesh nylon sieve screen 13 to separate sand and gravel with a particle size greater than 0.355mm in mud water and humus with a particle size greater than 0.355mm; choose 45-mesh nylon sieve screen 13 to separate sand and gravel with a particle size greater than 0.4mm in mud water And humus with a particle size greater than 0.4mm. In this embodiment, the mesh number of the nylon sieving mesh plate 13 is 65 meshes, which can screen gravel with a particle size larger than 0.25 mm and humus with a particle size larger than 0.25 mm.

Nylon sieve net plate 13 size is 405mm * 255mm, and each row is 9 pieces, totally 10 rows. Nylon screening screen support 1 is welded on frame 2 through vibrating spring 3 and spring seat tube 4, and spring seat tube support 11 is fixed on frame 2; as shown in Figure 2, nylon screening screen 13 is fixed with detachable The method is tiled on the nylon sieve mesh support 1. There are male and female grooves around the nylon sieve screen 13, so that multiple nylon sieve screens 13 can be tightly connected together, and the nylon sieve screen group can Avoid leaks completely. Nylon sieve net plate 13 is fixed on the nylon sieve net plate support 1 by the fine thread stud welded on the nylon sieve net plate support 1, compresses with the butterfly nut that prevents vibration from loosening. When a certain nylon screening screen 13 is damaged due to wear or other reasons, the wing nut can be opened to extract the nylon screening screen 13 for replacement without integral replacement, which further reduces the cost.

A set of exciter 9, the motor power of the exciter 9 is 0.55kw, high-frequency small vibration, the vibration frequency is 2000-3500 times/min, 2850 times/min is taken in the present embodiment; The device base 10 is welded on the nylon sieve screen support 1. The entire device has only one set of vibrator as the vibration element, and the rest is a fixed structure, and because the vibration amplitude is small, the device operates reliably and the energy consumption is very low (it is a few percent or even a few thousandths of the installed power of ordinary vibrating screens. ); Since the main components of the device are standardized products, it is relatively easy to purchase in the market, so the interchangeability is very strong, and the vulnerable parts of the equipment have a strong market guarantee ability.

One end of the nylon screening screen support 1 is connected with the frame 2 by a hinge, and the other end adjusts the inclination angle of the nylon screening screen support 1 through the tension bolt and the push bolt together, so that the nylon screening screen support 1 can be selected according to the different materials to be separated. The proper inclination angle of the screen plate 13 can achieve the best separation effect and processing capacity. In this embodiment, the included angle between the nylon screening mesh plate 13 and the vertical direction is 55°.

As shown in Fig. 2, feed hopper 8 is arranged on the top of frame 2, and feed hopper 8 is welded on the frame 2 by feed hopper support 7; The lower end of the water receiving hopper 6 is provided with a mud water discharge pipe 5, and the mud water collected by the mud water receiving hopper 6 is discharged through the mud water discharge pipe 5; grit and humus are arranged on the side of the nylon screening screen support 1 The discharge hopper 12 is used to discharge the gravel after being collected.

This embodiment adopts Q235-A carbon steel plate, angle steel, channel steel, steel pipe and other steel materials with sufficient market supply. Nylon screen mesh plate 13 also has sufficient and high-quality market supply, and the connecting parts adopt standard bolts and nuts. , Gaskets and other parts.

In the above-mentioned mud water secondary screening equipment, the following processes are mainly completed:

(1) Gravel and humus enter the mud water secondary screening equipment through the feed hopper 8, start the vibrator 9, and the whole nylon screening screen support 1 starts to vibrate at high frequency and small range, driving the nylon screening screen support 1 All the fixed nylon screen panels 13 vibrate together; in order to prevent the entire frame 2 from resonating together, save energy, and keep the nylon screen panels 13 in a vibrating state, the entire nylon screen panels 13 are fixed by vibrating springs 3 On the fixed spring seat tube 4.

(B) muddy water is transported to the feeding hopper 8 of separation equipment by pipeline, and in feeding hopper 8, muddy water reaches liquid level height basically consistent by the action of water flow;

(C) muddy water evenly enters the nylon sieve screen 13 through the small holes on the side of the feed hopper 8; The hopper 6 is collected into the mud water discharge pipe 5 and flows out of the separation equipment;

(D) stay on the nylon sieve screen 13 and be greater than the soil particles, gravel, and humus of the nylon sieve screen 13 apertures, under the vibration of the nylon sieve screen 13, these materials are promoted to be transported downward, and the The soil particles close to the pore size of the nylon sieve screen 13 are in a vibrating state; since the components such as gravel and humus that are larger than the 13 pore size of the nylon sieve screen have very poor fluidity, if a traditional vibrating screen is used, due to the sand, humus and nylon sieve Net 13 apertures are close, and it is easy to block the aperture on the nylon sieve net plate 13. In this device, the nylon screening screen 13 has been in a high-frequency and small vibration state. On the one hand, these materials are pushed downward, and on the other hand, the gravel and humus that are close to the aperture of the nylon screening screen 13 are in a vibration state, and the materials cannot enter. The aperture on the nylon sieve net plate 13 thereby reaches the purpose of preventing clogging.

(E) Soil particles, gravel, and humus that are larger than the aperture of the nylon sieve screen 13 are pushed onto the gravel and humus outlet hopper 12, and flow out of the separation device under the action of gravity.

The effect after separation is: only the fine particles of soil are left in the mud water, the gravel of 0.25-2mm is completely separated, most of the humus is separated, and there is no noise when the pump on the water treatment system is running, and it is running Stable; the electromagnetic valve will no longer be blocked due to excessive particles and precipitation.

Claims (5)

1. Equipment for separating, rinsing, and repairing polluted soil to produce gravel and humus in mud water, which includes a frame (2), nylon sieve screen support (1), nylon sieve screen (13), and mud water receiving hopper ( 6), feed hopper (8), spring seat tube support (11), gravel and humus discharge hopper (12), characterized in that it also includes a vibrator (9) and a vibrator base (10); Described nylon screening screen support (1) is welded on the described frame (2) by vibrating spring (3), spring seat tube (4), and spring seat tube support (11) is fixed on frame (2) )superior; The vibrator (9) is welded on the nylon sieve screen support (1) through the vibrator base (10); several pieces of the nylon sieve screen (13) are detachably fixed. Lay on the described nylon sieve screen support (1); A feed hopper (8) is arranged on the top of the frame (2), and the feed hopper (8) passes through the feed hopper support (7) Welded on the frame (2); a mud water receiving hopper (6) is welded on the bottom surface of the frame (2), and the lower end of the mud water receiving hopper (6) is provided with a mud water discharge pipe (5), the mud water collected by the mud water receiving hopper (6) is discharged through the mud water discharge pipe (5); grit and humus discharge hoppers (12) are arranged on the side of the nylon sieve screen support (1) , used to collect gravel and discharge it; Wherein, the vibration mode of the vibrator (9) is high-frequency small-amplitude vibration; Wherein, the vibration frequency of the vibration exciter (9) is adjusted by adjusting the frequency converter connected with the frequency conversion motor, and the vibration frequency range of the vibration exciter (9) is 2000-3500 times/minute. 2. The equipment for separating, washing and repairing polluted soil to produce gravel and humus in mud water according to claim 1, characterized in that the vibration frequency of the vibrator (9) is 2850 times/min. 3. The equipment for separating, rinsing and repairing polluted soil according to claim 1 to produce grit and humus in mud water, characterized in that, according to the particle size of grit and humus to be separated as required, nylon sieve screens of different mesh numbers are selected (13): Select the 65 mesh nylon sieve screen (13) to separate the sand and gravel and the humus with a particle size greater than 0.25mm in the mud water; Select 50 mesh nylon sieve screens (13) to separate the sand and gravel and particle diameter greater than 0.355mm in the mud water; A 45-mesh nylon sieve screen (13) is selected to separate sand and gravel with a particle size greater than 0.4mm and humus with a particle size greater than 0.4mm in the mud water. 4. The equipment for separating, rinsing, and repairing polluted soil to produce grit and humus in mud water according to claim 3, characterized in that, the support angle of the nylon screen (13) is adjustable. 5. adopt the separation method of the equipment that separates and rinses the contaminated soil described in claim 1 to produce grit in the mud water, humus, and its steps are: (A) Start the vibration exciter (9), and the whole nylon screening screen support (1) starts to vibrate in a small range at high frequency, driving all the nylon screening screens (13) fixed on the nylon screening screen support (1) together vibration; (B) The slurry water is transported to the feed hopper (8) of the separation device through pipelines, and in the feed hopper (8), the slurry water reaches the liquid level height basically consistent by the action of water flow; (C) muddy water evenly enters the nylon sieve screen (13) through the small holes on the side of the feed hopper (8); under the action of gravity, soil particles and water smaller than the aperture of the nylon sieve screen (13) pass through the frame (2) The mud water receiving hopper (6) at the bottom is collected in the mud water discharge pipe (5) and flows out of the separation device; (D) stay on the nylon sieve screen (13) greater than the soil particles, gravel, and humus of the nylon sieve screen (13) aperture, under the vibration of the nylon sieve screen (13), these materials are pushed to the Down conveying, and make the soil particle close to the aperture of nylon sieve screen (13) be in vibration state, thus can't enter in the small hole on the nylon sieve screen (13); (E) Soil particles, gravel, and humus that are larger than the aperture of the nylon sieve screen are pushed onto the gravel and humus discharge hopper (12), and flow out of the separation device under the action of gravity.