CN114797240A - Reduction, harmless and recycling treatment process for shield slag and mud - Google Patents

Abstract

The invention discloses a lifting device for building facade reconstruction, which comprises the following steps: step one, preparing shield slag mud; step two, separating slag and mud; step three, separating sand and mud; step four, dehydration; step five, precipitation; step six, flocculation; step seven, filter pressing; and step eight, recycling the clean water. The invention belongs to the technical field of shield residue soil treatment, and particularly relates to a reduction, harmless and recycling treatment process for shield residue and mud.

Description

A reduction, harmless, and resource-based treatment process for shield slag and mud

technical field

The invention belongs to the technical field of shield slag treatment, and specifically relates to a reduction, harmless and resourceful treatment process for shield slag and mud.

Background technique

Shield slag and mud are a large amount of waste dregs produced in shield tunneling projects such as subways, tunnels and underground tunnels. With the rapid development of urbanization in my country, and the popularization and expansion of subways, tunnels, bridges and other transportation methods in various cities, the problems of secondary pollution, land occupation contradictions, and environmental hazards caused by subway slag are becoming more and more obvious. Therefore, the need for how to safely dispose of subway muck and its resource utilization and consumption is becoming more and more urgent. The timely treatment and consumption of shield slag and mud can eliminate its impact on earthwork construction such as subways, and solve the environmental hazards that it brings to the city. The treatment process of shield slag and mud is an important direction for scientific research in the future. Resource utilization is an important measure to solve the problems of high energy consumption, high pollution, high emission and low efficiency. It is an important way to save land, save resources and protect the environment. It is an inevitable requirement to implement the construction of ecological civilization, realize sustainable development and environmental protection.

At present, the following schemes are generally available in the market for the treatment of shield slag and mud: 1) The use of vibrating screen to separate coarse and fine materials, often the surface of coarse material is prone to adhesion, and the vibrating screen is easily blocked by large clods and agglomerates. It is not easy to pass, and needs to be stopped frequently for correction; 2) The shield slag and mud directly enter the crushing mixer for sand making treatment, which makes the utilization rate of coarse materials low. Due to the crushing characteristics of the sand making machine, although the coarse materials can be broken into small ones, the small particles will also be lost as powder, and the utilization rate is not high; 3) A large amount of accumulation is used as filling waste and dragged to other construction sites as construction waste Problems such as use or accumulation of land and land occupation, environmental hazards, etc., too high accumulation, there are risks such as landslides and mudslides. The traditional treatment method leads to a large amount of dust around the treatment site, causing pollution problems such as the environment and traffic.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a process for the reduction, harmlessness and recycling of shield slag and mud, so as to solve the problems raised in the above-mentioned background technology.

In order to solve the above-mentioned technical problems, a reduction, harmless, and resourceful treatment process for shield slag and mud proposed by the present invention includes the following steps:

Step 1. Prepare the shield slag, get the slag material from the slag tank, lift it, and transfer it to the feed bin;

Step 2: The slag and mud are separated, and the shield slag and mud materials in the feed bin enter into the inclined circular tumbling screen under the lubrication of clean water. There are two sets of high-pressure water spray devices on both sides of the inclined circular trommel screen. The water device is used to break up large pieces of shield slag and sludge, and the second group of high-pressure water spray devices is used to clean the inclined round tumbling screen. A group of high-pressure water spraying devices and a second group of high-pressure water spraying devices separate the slag and water. After filtering the slag, the coarse/medium aggregates are tilted out on the tumbling screen and transported to the coarse/medium aggregate yard through the conveyor belt;

Step 3: The sand and mud are detached. In step 2, the mud material mixture, including fine sand, powder, clay and water, filtered by the inclined circular tumbling sieve is sent to the sand washing system through the under-sieve guide groove, and the sand washing system adopts the wheel bucket. Sand washing machine and add clean water to clean the mud mixture. After cleaning, the mud mixture is sent to the dewatering screen and washed with high pressure water to reduce the mud content in the sand. The fine sand screened by the dewatering screen is sent to the fine aggregate pile through the conveyor belt. field;

Step 4, dehydration, the mixture overflowing from the wheel bucket sand washing machine in step 3 and the mixture under the dewatering screen enter the under-screen collection box together, and the mud in the under-screen collection box is pumped into the hydrocyclone, and one end of the hydrocyclone flows into the under-screen collection box. Dewatering screen;

Step 5, precipitation, the other end of the hydrocyclone in step 4 enters the first-level sedimentation tank; at the same time, the overflow of the collection box under the sieve enters the first-level sedimentation tank; the overflow of the first-level sedimentation tank enters the second-level sedimentation tank, and the second-level sedimentation is carried out. The clear water at the top of the pool overflows into the clear water pool;

Step 6: flocculation. Both the first-level sedimentation tank and the second-level sedimentation tank pump the mud into the flocculation tower through the pump, and fully mix with the flocculant conveyed by the pump through the chemical tank. The separated clean water and the overflowed clean water pass through the upper pipe of the flocculation tower. Quickly fall into the clear water pool;

Step 7: filter press, the flocculation mud and flocculant precipitated at the bottom of the flocculation tower are flocculated again through the pipeline mixing device, and then enter the filter press for pressure filtration to form low moisture content mud cake and clean water. The clean water overflows into the clean water tank, and the mud cake Transfer to dry mud yard;

Step 8: Recycle the clean water. The clean water in the clean water pool is recycled in the system.

Preferably, in the second step, the angle between the incident water flow of the first group of high-pressure water spray devices and the ground is 35-55 degrees, preferably 45 degrees.

Preferably, in the second step, the clean water sprayed by the second group of high-pressure water spraying devices is scattered into fine water droplets and evenly spread on the surface of the inclined circular tumbling screen.

Further, the overflowing clean water of the flocculation tower falls into the clear water tank from the upper part of the flocculation tower through the pipeline. This process has dynamic potential energy to continuously stir the clear water in the clear water tank, thereby degrading the residual flocculant in the clear water tank.

Preferably, the bottom surface of the chemical tank is designed with an inclined structure, and the inclined end of the chemical tank is recessed with an inner tank for collecting flocculant sediments in clean water.

The present invention adopts the above structure to obtain the following beneficial effects: the invention provides a process for reducing, harmless, and recycling shield slag and mud. It effectively avoids frequent shutdowns and greatly improves production efficiency; improves the utilization rate of coarse materials and the economic value of the use of coarse materials; reduces the contradiction of shield slag, mud accumulation and land occupation, environmental hazards and other problems, and effectively avoids excessive accumulation of landslides. Risk of mudslides, etc.

Description of drawings

Fig. 1 is the flow chart of a kind of shield slag, mud reduction, harmless, resource treatment process of the present invention;

Fig. 2 is the top view of inclined round tumbling screen;

Fig. 3 is the side view of the A surface of the inclined tumbler screen;

Fig. 4 is the side view of the B side of the inclined tumbler screen;

FIG. 5 is a top view of the medicament pool.

Among them, 1. Muck pool, 2. Feeding bin, 3. Inclined tumbling screen, 4. First group of high-pressure water spraying device, 5. Second group of high-pressure water spraying device, 6. Nozzle, 7. Screen guide Tank, 8, Sand Washer with Wheel Bucket, 9, Dewatering Screen, 10, Fine Aggregate Storage Yard, 11, Coarse/Medium Aggregate Storage Yard, 12, Collection Box Under Screen, 13, Hydrocyclone, 14, One Level 1 sedimentation tank, 15, secondary sedimentation tank, 16, clear water tank, 17, flocculation tower, 18, chemical tank, 19, pipeline mixing device, 20, filter press, 21, dry mud storage yard, 22, inner tank .

Detailed ways

The technical solutions of the present invention will be described in further detail below in conjunction with specific implementations. The parts of the present invention that are not described in detail in terms of technical features or connection relationships are the prior art used.

In the description of the present invention, it should be understood that the terms "portrait", "horizontal", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientation or positional relationship indicated by "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, and It is not indicated or implied that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.

The present invention will be described in further detail below with reference to the accompanying drawings.

As shown in Figures 1-4, the present invention provides a process for the reduction, harmlessness and recycling of shield slag and mud, including the following steps:

Step 1: Prepare the shield slag, obtain the slag material from the slag pool 1, lift it, and transfer it to the feed bin 2. The feed bin 2 is at a higher position, so that the slag material can naturally pass through the potential energy during sieving. fall down;

Step 2: The slag and mud are separated, and the shield slag and mud materials in the feed bin 2 enter the inclined tumbling screen 3 under the lubrication of clean water. There are two groups of high-pressure water spraying devices distributed on both sides of the inclined tumbling screen 3. The group of high-pressure water spraying devices 4 is used to break up large pieces of shield slag and sludge adhesion, and the second group of high-pressure water spraying devices 5 is used to clean the inclined circular tumbling screen 3, which has the following functions: first, it is used to clean the outer mesh Screen, the second is to break up large slag and mud adhesives, the third is to clean the internal materials and quickly separate the slag and mud. The two sets of high-pressure water spraying devices are each composed of multiple nozzles 6. The interval between the nozzles 6 and 6 is 30-55cm. Set according to the type of material, the specific number of nozzles 6 is set according to the size of the roller screen. As shown in the figure, the surface A of the inclined circular roller screen 3 is the first group of high-pressure water spray devices 4, and the first group of high-pressure water spray devices 4 shoot out The water column forms resistance with the materials entering the inclined circular tumbling screen 3, and disperses the large shield slag and mud agglomerates entering the inclined circular tumbling screen 3, which is convenient for cleaning materials. The shield slag and mud can be quickly separated by high-pressure washing. The water column shot by the second group of high-pressure water spraying devices 5 on the B side further washes the separated particles, so that the particles are accelerated into the conveyor belt, so as to improve the working efficiency of the inclined tumbler screen 3. The inclined tumbler screen 3 rotates itself at the same time. Using the first group of high-pressure water spraying devices 4 and the second group of high-pressure water spraying devices 5 arranged around the periphery, the coarse/medium aggregates are effectively separated directly and transported to the coarse/medium aggregate storage yard 11 through the conveyor belt. The key point of the invention is different from other technical solutions. The present invention adopts the method of spraying and dissolving synchronously and sieving. Under the action of the water flow, the fine sediment will be taken away by the water flow, and the surface of large particles such as stones can also be effectively cleaned. It can effectively prevent clogging, and it is not easy to stick to the soil when large materials are screened. At the same time, spraying has the effect of saving electric energy on the inclined round tumbling screen 3. Because the shield slag and mud are easily softened by high-pressure water spraying and directly screened, it can effectively Reduce the sieving time of the inclined tumbling screen 3 and save more electric energy;

In step 3, the sand and mud are separated. In step 2, the mud mixture filtered by the inclined circular tumbling screen 3, including fine sand, powder, clay and water, is sent into the sand washing system through the under-sieve guide groove 7, and the sand washing system adopts The wheel bucket sand washing machine 8 adds clean water to clean the mud mixture. After cleaning, the mud mixture is sent to the dewatering screen 9 and washed with high-pressure water to reduce the mud content in the sand. The fine sand screened by the dewatering screen 9 is sent through the conveyor belt. into the fine aggregate yard 10;

Step 4, dehydration, the overflow mixture from the wheel bucket sand washing machine 8 in the step 3 enters the collection box 12 under the screen together with the mixture under the dewatering screen 9, and the mud in the collection box 12 under the screen is pumped into the hydrocyclone 13, and the hydrocyclone One end of the flow device 13 flows into the dewatering screen 9;

Step 5, precipitation, the other end of the hydrocyclone 13 in step 4 enters the first-level sedimentation tank 14; at the same time, the overflow of the collection box 12 under the screen enters the first-level sedimentation tank 14; the overflow of the first-level sedimentation tank 14 enters the second-level sedimentation Pool 15, the clean water at the top of the secondary sedimentation tank 15 overflows into the clean water tank 16;

Step 6, flocculation, both the primary sedimentation tank 14 and the secondary sedimentation tank 15 pump the mud into the flocculation tower 17 through the pump, and fully mix with the flocculant transported by the pump in the chemical tank 18, and the separated clean water and the overflowed clean water pass through. The upper pipe of the flocculation tower 17 quickly falls into the clear water tank 16;

Step 7, filter press, the flocculation mud and flocculant deposited at the bottom of the flocculation tower 17 are flocculated again through the pipeline mixing device 19, and then enter the filter press 20 for pressure filtration to form a low moisture content mud cake and clear water, and the clear water overflows to the clear water tank. In 16, the mud cake is transferred to the dry mud yard 21;

Step 8: Recycling of clean water, the clean water in the clean water pool 16 is recycled in the system.

As shown in Figure 2-4, in step 2, the angle between the incident water flow of the first group of high-pressure water spray devices 4 and the ground is 35-55 degrees, preferably 45 degrees; the clean water sprayed from the second group of high-pressure water spray devices 5 in step 2 Disperse into fine water droplets and evenly spread on the surface of the inclined round tumbling screen 3.

The overflowing clean water from the flocculation tower 17 falls into the clean water tank 16 from the upper part of the flocculation tower 17 through pipes.

As shown in FIG. 5 , the bottom surface of the medicine pool 18 is designed with an inclined structure, and the inclined end of the medicine pool 18 is recessed with an inner pool 22 , which plays a good role in collecting medicines.

At the same time, the core equipment used in each step is independently equipped with a hoisting device, which is used for easy movement on an independent vehicle for flexible transition.

The present invention and its embodiments have been described above, and the description is not restrictive, and what is shown in the accompanying drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. All in all, if those of ordinary skill in the art are inspired by it, and without departing from the purpose of the present invention, any structural modes and embodiments similar to this technical solution are designed without creativity, and all should belong to the protection scope of the present invention.

Claims (5)

1. A reduction, harmless and recycling treatment process for shield slag and mud is characterized by comprising the following steps:

firstly, preparing shield slag mud, obtaining slag mud materials from a slag pool, lifting the materials, and transferring the materials to a feeding bin;

separating slag and mud, enabling shield slag and mud materials in a feeding bin to enter an inclined round roller screen under the lubricating action of clear water, distributing two groups of high-pressure water spraying devices on two sides of the inclined round roller screen, wherein the first group of high-pressure water spraying devices are used for scattering massive shield slag and mud adhesives, the second group of high-pressure water spraying devices are used for cleaning the inclined round roller screen, the inclined round roller screen is used for separating slag mud and water by utilizing the first group of high-pressure water spraying devices and the second group of high-pressure water spraying devices which are distributed on the periphery of the inclined round roller screen while rotating obliquely, and after the slag mud is filtered, the coarse/medium aggregate is obliquely rotated out of the round roller screen and is conveyed to a coarse/medium aggregate storage yard through a conveying belt;

step three, sand and mud separation, wherein in the step two, a mud mixture filtered by an inclined round roller screen comprises fine sand, powder particles, sticky particles and water and is sent into a sand washing system through an undersize guide groove, the sand washing system adopts a wheel bucket sand washing machine and clean water is added to wash the mud mixture, the washed mud mixture is sent into a dewatering screen and is washed by high-pressure water so as to reduce the mud content in the sand, and the fine sand screened by the dewatering screen is sent into a fine aggregate storage yard through a conveyor belt;

step four, dewatering, wherein the mixture overflowing from the wheel bucket sand washer in the step three and the mixture under the screen of the dewatering screen enter a collection box under the screen together, slurry in the collection box under the screen is pumped into a hydrocyclone, and one end of the hydrocyclone flows into the dewatering screen;

step five, sedimentation, wherein the other end of the hydrocyclone in the step four enters a primary sedimentation tank; meanwhile, the undersize collecting box overflows into a primary sedimentation tank; overflowing the primary sedimentation tank into a secondary sedimentation tank, and overflowing clear water at the top of the secondary sedimentation tank into a clear water tank;

pumping the slurry into a flocculation tower through a pump in the primary sedimentation tank and the secondary sedimentation tank, fully mixing the slurry with a flocculating agent conveyed by a medicament tank through the pump, and quickly dropping the overflowed clear water into a clear water tank through a pipeline at the upper end of the flocculation tower;

step seven, filter pressing, wherein after flocculating mud and a flocculating agent which are precipitated at the bottom of the flocculating tower are flocculated again through a pipeline mixing device, the flocculating mud and the flocculating agent enter a filter press for filter pressing to form a mud cake with low water content and clear water, the clear water overflows into a clear water tank, and the mud cake is conveyed to a dry mud material yard;

and step eight, recycling the clean water, wherein the clean water in the clean water tank is recycled in the system.

2. The reduction, harmless and recycling treatment process of shield slag and mud according to claim 1, wherein in the second step, the included angle between the incident water flow of the first group of high-pressure water spraying devices and the ground is 35-55 degrees, preferably 45 degrees.

3. The process of claim 2, wherein the clean water sprayed from the second group of high pressure water spray devices is dispersed into fine water droplets and uniformly spread on the surface of the inclined round roller screen.

4. The reduction, harmless and recycling treatment process of shield slag and mud according to claim 3, wherein overflow clear water of the flocculation tower falls into a clear water tank from the upper part of the flocculation tower through a pipeline.

5. The reduction, harmless and recycling treatment process of shield slag and mud according to claim 4, wherein the bottom surface of the medicament pool is designed to be an inclined structure, and an inner pool is arranged at the inclined tail end of the medicament pool in a concave manner.

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