Muck drying treatment mechanical equipment and related process

Abstract

The invention discloses muck drying treatment mechanical equipment and a related process, and relates to the technical field of muck treatment. The device comprises a feeding device, a discharging device and a control device, wherein the feeding device is used for conveying shield tunneling machine sludge; the pretreatment equipment is used for mixing a surface modifier and adjusting the pH value of sludge, and first-stage multi-layer screening equipment, second-stage multi-layer screening equipment, third-stage multi-layer screening equipment, flocculation equipment and filter pressing equipment are sequentially connected below the pretreatment equipment; the first-stage multi-layer screening equipment, the second-stage multi-layer screening equipment and the third-stage multi-layer screening equipment are used for carrying out dehydration treatment on sludge in sequence, and the first-stage multi-layer screening equipment and the second-stage multi-layer screening equipment are connected with the flocculation equipment through pipelines; the sludge generated by the shield tunneling machine can be rapidly and efficiently treated, compared with the prior art, the transportation cost and the treatment cost can be effectively reduced, and pollution and influence of the sludge on the environment are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of slag treatment, and in particular to a slag drying treatment mechanical equipment and related processes. Background Art

[0002] With the vigorous development and construction of transportation infrastructure, the construction scale of urban rail transit and tunnel infrastructure has greatly increased. In the process of such construction using shield machines, a large amount of slag is inevitably generated. At present, the large amount of slag generated by shield construction has become a new problem of environmental pollution that needs to be solved urgently.

[0003] Currently, shield tunneling waste is handled by direct external transportation, which causes problems such as pollution to the surrounding environment and high transportation costs. There is an urgent need for an efficient, environmentally friendly and economical treatment method.

[0004] Therefore, a kind of mechanical equipment and relevant technology for slag drying treatment are proposed. Summary of the invention

[0005] The purpose of the present invention is to solve the problems mentioned in the above background technology, and provide a kind of mechanical equipment and related technology for drying slag.

[0006] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0007] A mechanical device for drying and treating slag, comprising:

[0008] A feeding device, wherein the feeding device is used to convey shield machine sludge;

[0009] A pretreatment device, the pretreatment device is used to mix a surface modifier and adjust the pH of the sludge, and the pretreatment device is sequentially connected to a primary multi-layer screening device, a secondary multi-layer screening device, a tertiary multi-layer screening device, a flocculation device and a filter press device below the pretreatment device;

[0010] The first-level multi-layer screening device, the second-level multi-layer screening device and the third-level multi-layer screening device sequentially dehydrate the sludge, and the first-level multi-layer screening device and the second-level multi-layer screening device are connected to the flocculation device through pipelines;

[0011] The secondary multi-layer screening equipment is equipped with a primary cyclone and a secondary vibrating screen, and the tertiary multi-layer screening equipment is equipped with a secondary cyclone, a sand washing tank and a tertiary vibrating screen;

[0012] The pretreatment equipment includes a box body, a feeding pipe is fixedly inserted on the top surface of the box body, a motor is fixedly installed on the side of the box body, a rotating shaft is fixedly connected to the output end of the motor, a stirring blade is fixedly connected to the surface of the rotating shaft, and a feeding pipe is fixedly inserted on the bottom of the box body.

[0013] Furthermore, the pH value of the pretreatment equipment is adjusted to 6.0-8.0 and the water content is 40%-80% by a surface modifier.

[0014] A slag drying process comprises the following steps:

[0015] Step 1: Evenly mix the shield machine sludge and one or more of the organic wastes in a pretreatment device, and adjust the pH value thereof by a surface modifier;

[0016] Step 2: The mixture is subjected to primary screening using a primary multi-layer screening device to obtain primary slag and a first screening filtrate;

[0017] Step 3: using a two-stage multi-layer screening device to perform a second-stage screening on the first screening filtrate to obtain a second-stage slag and a second screening filtrate;

[0018] Step 4: using a three-stage multi-layer screening device to process the secondary slag to be screened, to obtain secondary slag and a three-layer screening filtrate;

[0019] Step 5: flocculating the second sieved filtrate with a flocculant in a flocculation device to obtain flocculated soil and a first clear liquid;

[0020] Step 6: Use filter press equipment to filter the flocculated slag to obtain mud cake and the second clear liquid.

[0021] Furthermore, before the step 1, a tempering and modifying agent is added to the slag, and the tempering and modifying agent is prepared by mixing recycled micro powder, attapulgite and magnesium oxide.

[0022] Furthermore, the technical indicators of the regenerated micropowder meet one of the Class I or Class II regenerated micropowders specified in "Regenerated Micropowder for Concrete and Mortar" JG / T573-2020, the fineness range of attapulgite is 100-360 mesh, and the purity of magnesium oxide is not less than 75%.

[0023] Furthermore, before removing excess moisture from the slag, the physical properties of the slag are analyzed and the classification and stacking procedures are completed.

[0024] Furthermore, the physical property analysis includes water content, liquid limit, plastic limit, porosity, particle size analysis and strength, and the physical property analysis may also include soluble salt and pH value testing.

[0025] The beneficial effects of the present invention are as follows:

[0026] The sludge generated by the shield machine is fed into the pretreatment device through a feeding device, a surface modifier is added to the box body through a feeding pipe by the pretreatment device, the pH value of the sludge is adjusted, and the rotating shaft is driven to rotate by a motor to drive the stirring blades to rotate, so as to stir and mix the sludge and organic waste, and achieve a crushing effect, so that the internal slag is fully mixed, and then the slag is screened for multiple times by a first-level multi-layer screening device, a second-level multi-layer screening device and a third-level multi-layer screening device, and after screening, the flocculant in the flocculation device is mixed with the slag, and the sludge is flocculated and precipitated, and finally the slag is filtered by a filter press to remove moisture. The present invention can quickly and efficiently treat the sludge generated by the shield machine, and can effectively reduce transportation costs and treatment costs compared to the prior art, and reduce the pollution and impact of the sludge on the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0028] Figure 2 It is a front cross-sectional view of the structure of the pretreatment equipment of the present invention;

[0029] Figure numerals: 1. Feeding equipment; 2. Pretreatment equipment; 201. Box; 202. Feeding pipe; 203. Motor; 204. Rotating shaft; 205. Stirring blades; 206. Feeding pipe; 3. First-level multi-layer screening equipment; 4. Second-level multi-layer screening equipment; 5. Third-level multi-layer screening equipment; 6. Flocculation equipment; 7. Filter press equipment. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In addition, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0033] The electrical components mentioned in this article are all connected to an external main controller and 220V mains electricity, and the main controller can be a conventional known device for controlling a computer or the like.

[0034] In the description of the embodiments of the present invention, it should be noted that the terms "inside", "outside", "upper", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] like Figure 1 , Figure 2 As shown, a mechanical device for drying and processing slag, comprising:

[0036] Feeding equipment 1, feeding equipment 1 is used to convey shield machine sludge;

[0037] Pretreatment equipment 2, the pretreatment equipment 2 is used to mix the surface modifier and adjust the pH value of the sludge. The pretreatment equipment 2 is sequentially connected to the lower part with a first-level multi-layer screening equipment 3, a second-level multi-layer screening equipment 4, a third-level multi-layer screening equipment 5, a flocculation equipment 6 and a filter press equipment 7;

[0038] The first-level multi-layer screening device 3, the second-level multi-layer screening device 4 and the third-level multi-layer screening device 5 sequentially dehydrate the sludge, and the first-level multi-layer screening device 3 and the second-level multi-layer screening device 4 are connected to the flocculation device 6 through pipelines;

[0039] The secondary multi-layer screening device 4 is equipped with a primary cyclone and a secondary vibrating screen, and the tertiary multi-layer screening device 5 is equipped with a secondary cyclone, a sand washing tank and a tertiary vibrating screen;

[0040] The pretreatment equipment 2 includes a box body 201, a feeding pipe 202 is fixedly inserted on the top surface of the box body 201, a motor 203 is fixedly installed on the side of the box body 201, a rotating shaft 204 is fixedly connected to the output end of the motor 203, a stirring blade 205 is fixedly connected to the surface of the rotating shaft 204, and a feeding pipe 206 is fixedly inserted on the bottom of the box body 201.

[0041] More specifically, the sludge generated by the shield machine is fed into the pretreatment device 2 through the feeding device 1, and the surface modifier is added to the box 201 through the feeding pipe 202 of the pretreatment device 2 to adjust the pH value of the sludge. The rotating shaft 204 is driven to rotate by the motor 203, which drives the stirring blade 205 to rotate, so as to stir and mix the sludge and organic waste, and achieve a crushing effect so that the internal debris is fully mixed. Subsequently, the debris is screened multiple times by the first-level multi-layer screening device 3, the second-level multi-layer screening device 4 and the third-level multi-layer screening device 5. After screening, the flocculant in the flocculation device 6 is mixed with the debris to flocculate and precipitate the sludge, and finally the debris is filtered by the filter press device 7 to remove moisture.

[0042] In the pretreatment device 2, the pH value is adjusted to 6.0-8.0 and the water content is 40%-80% by using a surface modifier.

[0043] A slag drying process comprises the following steps:

[0044] Step 1: Evenly mix the shield machine sludge and one or more of the organic wastes in the pretreatment device 2, and adjust the pH value thereof by using a surface modifier;

[0045] Step 2: The mixture is subjected to primary screening using a primary multi-layer screening device 3 to obtain primary slag and a first screening filtrate;

[0046] Step 3: using a secondary multi-layer screening device 4 to perform secondary screening on the first screening filtrate to obtain secondary slag and a second screening filtrate;

[0047] Step 4: using the three-stage multi-layer screening device 5 to process the secondary slag to be screened, to obtain the secondary slag and the three-layer screening filtrate;

[0048] Step 5: flocculating the second sieved filtrate by means of a flocculant in a flocculation device 6 to obtain flocculated soil and a first clear liquid;

[0049] Step 6: Use filter press equipment 7 to filter the flocculated soil to obtain mud cake and second clear liquid.

[0050] More specifically, the first screening filtrate is transported to the secondary multi-layer screening device 4 by a delivery pump, and the first screening filtrate is subjected to a first-layer screening treatment by a first-layer cyclone in the secondary multi-layer screening device 4 to obtain a first-layer screening filtrate and coarse-screened slag, and the coarse-screened slag is subjected to a second-layer screening treatment by a second-layer vibrating screen in the secondary multi-layer screening device 4 to obtain second-layer slag to be screened and a second-layer screening filtrate, and then the second-layer slag to be screened is screened to obtain second-layer slag and a third-layer screening filtrate, and the first-layer screening filtrate, the second-layer screening filtrate and the third-layer screening filtrate are transported to the second-layer cyclone in the third-stage multi-layer screening device 5 by a delivery pump, and then separated to obtain separated slag and a second screening filtrate, The separated slag is added to the slag to be screened, and the secondary slag to be screened is screened to obtain secondary slag and three-layer screening filtrate. Thereafter, the secondary slag to be screened is transported to the three-level multi-layer screening equipment 5 of the shield slag by a conveying pump, and this equipment is used to process the secondary slag to be screened to obtain secondary slag and three-layer screening filtrate, and the secondary slag is output. The sand washing trough of the three-level multi-layer screening equipment 5 is used to wash and stir the secondary slag to obtain stirred slag and a first overflow filtrate. The stirred slag is subjected to three-level screening through the three-level vibrating screen of the three-level multi-layer screening equipment 5 to obtain secondary slag and a second overflow filtrate. The first overflow filtrate and the second overflow filtrate are defined as the three-layer screening filtrate.

[0051] Step 1: Add a tempering modifier to the slag, the tempering modifier is made by mixing recycled micro powder, attapulgite and magnesium oxide. More specifically, since the shield engineering slag has a high moisture content, the moisture content is improved by adding the tempering modifier.

[0052] The technical indicators of the recycled micropowder meet the requirements of one of the Class I or Class II recycled micropowders specified in "Recycled Micropowder for Concrete and Mortar" JG / T 573-2020. The fineness range of the attapulgite is 100-360 mesh, and the purity of magnesium oxide is not less than 75%.

[0053] Before removing excess moisture from the slag, the physical properties of the slag are analyzed and the classification and stacking procedures are completed.

[0054] Physical property analysis includes moisture content, liquid limit, plastic limit, porosity, particle size analysis and strength. Physical property analysis can also include soluble salt and pH value testing.

[0055] In summary: the sludge generated by the shield machine is fed into the pretreatment device 2 through the feeding device 1, and the surface modifier is added to the box 201 through the feeding pipe 202 of the pretreatment device 2 to adjust the pH value of the sludge. The rotating shaft 204 is driven to rotate by the motor 203, and the stirring blade 205 is driven to rotate, so that the sludge and organic waste are stirred and mixed, and the crushing effect is achieved, so that the internal slag is fully mixed, and then the slag is screened for multiple times through the first-level multi-layer screening device 3, the second-level multi-layer screening device 4 and the third-level multi-layer screening device 5. After screening, the flocculant in the flocculation device 6 is mixed with the slag, and the sludge is flocculated and precipitated. Finally, the slag is filtered by the filter press device 7 to remove moisture. The present invention can quickly and efficiently treat the sludge generated by the shield machine. Compared with the prior art, it can effectively reduce transportation costs and treatment costs, and reduce the pollution and impact of sludge on the environment.

[0056] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A mechanical device for drying soil, characterized in that: include: A feeding device (1), the feeding device (1) is used to convey shield machine sludge; A pretreatment device (2), the pretreatment device (2) is used to mix a surface modifier and adjust the pH value of the sludge, and the pretreatment device (2) is sequentially connected to a first-level multi-layer screening device (3), a second-level multi-layer screening device (4), a third-level multi-layer screening device (5), a flocculation device (6) and a filter press device (7) below the pretreatment device (2); The first-level multi-layer screening device (3), the second-level multi-layer screening device (4) and the third-level multi-layer screening device (5) sequentially perform dehydration treatment on the sludge, and the first-level multi-layer screening device (3) and the second-level multi-layer screening device (4) are both connected to the flocculation device (6) through pipelines; The secondary multi-layer screening device (4) is equipped with a primary cyclone and a secondary vibrating screen, and the tertiary multi-layer screening device (5) is equipped with a secondary cyclone, a sand washing tank and a tertiary vibrating screen; The pretreatment equipment (2) comprises a box body (201), a feeding pipe (202) is fixedly plugged into the top surface of the box body (201), a motor (203) is fixedly installed on the side of the box body (201), a rotating shaft (204) is fixedly connected to the output end of the motor (203), a stirring blade (205) is fixedly connected to the surface of the rotating shaft (204), and a feeding pipe (206) is fixedly plugged into the bottom of the box body (201).

2. According to the mechanical equipment for drying slag according to claim 1, the pH value of the pretreatment equipment (2) is adjusted to 6.0-8.0 and the moisture content is 40%-80% by a surface modifier.

3. A soil drying process according to any one of claims 1 or 2, characterized in that: The steps include: Step 1: Evenly mixing shield machine sludge with one or more of organic wastes in a pretreatment device (2), and adjusting the pH value thereof by using a surface modifier; Step 2: The mixture is subjected to primary screening using a primary multi-layer screening device (3) to obtain primary slag and a first screening filtrate; Step 3: using a two-stage multi-layer screening device (4) to perform two-stage screening on the first screening filtrate to obtain a second-stage slag and a second screening filtrate; Step 4: using the three-stage multi-layer screening device (5) to process the secondary slag to be screened, to obtain the secondary slag and the three-layer screening filtrate; Step 5: flocculating the second sieved filtrate with a flocculant in a flocculation device (6) to obtain flocculated soil and a first clear liquid; Step 6: Use filter press equipment (7) to filter the flocculated soil to obtain a mud cake and a second clear liquid.

4. A soil drying process according to claim 3, characterized in that: In the step 1, a conditioning modifier is added to the slag, and the conditioning modifier is prepared by mixing recycled micro powder, attapulgite and magnesium oxide.

5. The soil drying process according to claim 4, characterized in that: The technical indicators of the regenerated micropowder meet one of the Class I or Class II regenerated micropowders specified in "Regenerated Micropowder for Concrete and Mortar" JG / T 573-2020, the fineness range of the attapulgite is 100-360 mesh, and the purity of the magnesium oxide is not less than 75%.

6. The soil drying process according to claim 4, characterized in that: Before removing excess moisture from the slag, the physical properties of the slag are analyzed and the classification and stacking procedures are completed.

7. A soil drying process according to claim 6, characterized in that: The physical property analysis includes water content, liquid limit, plastic limit, porosity, particle size analysis and strength. The physical property analysis may also include soluble salt and pH value testing.

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