An integrated test method and equipment for slurry dewatering, solidification and ultra-high pressure consolidation

Abstract

The present application relates to the field of liquid waste recycling, and discloses a dredging slurry dewatering-solidification / ultra-high pressure consolidation integrated test method and a model test machine, which can simulate the whole preparation process of the dredging slurry to the gravel, and analyze and measure the dewatering efficiency and the solidification-ultra-high pressure process. The indoor simulation of the sludge resource utilization and the integrated test method of the key parameters are realized. The test method and the model test machine are simple and easy to operate, and the test work is coherent. The present application is an indoor simulation test method and a model test machine which can be replicated and realized for the treatment and disposal of the dredging slurry and the resource utilization.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of liquid waste recycling, in particular to a slurry dewatering-solidification-ultra-high pressure consolidation integrated test method and equipment. BACKGROUND

[0002] At present, the phenomenon of sediment accumulation in rivers, lakes and reservoirs is common, especially in the Yangtze River and Yellow River basins, where sediment accumulation is particularly serious, which has a great impact on water function. Under the premise that the exogenous pollution is effectively controlled, the use of dredging to remove the endogenous sediment in rivers, lakes and reservoirs is a conventional means in the existing water treatment engineering. One of the biggest puzzles encountered in the implementation process of dredging engineering is the large amount of slurry produced in a short period of time, which is difficult to handle and dispose. The traditional slurry treatment and disposal method is to blow the slurry to the yard for natural settlement and supernatant discharge, and then form a fill by solidifying for a long time. However, with the increasing limitation of site, the slurry produced by the current dredging project usually needs to be pumped to a dewatering site for mechanical dewatering first, and then transported out to find the final treatment method after forming a mud cake. Therefore, the dewatering of dredging slurry to form a mud cake cannot achieve the final proper disposal of the sludge.

[0003] The sludge of rivers, lakes and reservoirs is essentially composed of sediment particles, adhered organic matter and a small amount of heavy metals and other substances, so under the premise of ensuring that no secondary pollution is caused, it can be completely recycled and utilized after certain treatment, creating certain added value and saving the loss of other resources. Since the nature of sludge is most similar to that of clay, in addition to being used for "three soil" utilization such as land, soil material and soil material, it can also be prepared into gravel by simulating the formation of shale in the stratum. From the slurry produced by dredging to high-strength gravel, it generally needs to go through processes such as dewatering, solidification and ultra-high pressure consolidation. At present, there are corresponding test methods and devices for dewatering, solidification and consolidation, but they lack uniformity: such as what value of the water content of the mud cake formed by slurry dewatering is the best water content for solidification, and what effect does the selection and addition of solidification materials have on subsequent ultra-high pressure consolidation, etc. Therefore, if an integrated test method and model test machine can be formed in an integrated manner, forming a slurry dewatering-solidification-ultra-high pressure consolidation integrated test method, the preparation process of slurry to high-strength gravel can be better researched.

[0004] In summary, the problems and defects of some existing test devices and experimental methods are that: dehydration, solidification and consolidation each have their own experimental methods and devices, and it is impossible to realize the test of forming gravel through the integration of dehydration, solidification and ultra-high pressure consolidation. The consolidation test device cannot analyze and determine the changes of the mud sample in the process from "soil to stone". Therefore, in order to make up for the deficiencies of the prior art, a dehydration-solidification-ultra-high pressure consolidation integrated test method and model test machine are needed, which can analyze and determine the change process of the silt from mud to gravel, and at the same time realize the future prototype of the equipment for preparing gravel from mud. SUMMARY

[0005] The present application aims to provide a mud dehydration-solidification-ultra-high pressure consolidation integrated test method to solve the problem that the prior art cannot realize the test of forming gravel through the integration of dehydration, solidification and ultra-high pressure consolidation.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical scheme: a mud dehydration-solidification-ultra-high pressure consolidation integrated test method, comprising the following steps:

[0007] A. conditioning the dredged mud before dehydration;

[0008] B. injecting the mud flocculating material and the solidifying agent into the mud in a certain proportion in sequence and stirring uniformly;

[0009] C. performing pressure filtration dehydration on the conditioned mud, simultaneously determining the drainage amount and the mud reduction amount, and obtaining the dry matter filtration flux per unit time, i.e. the dehydration efficiency, through the difference between the two;

[0010] D. squeezing the mud cake from the mud after pressure filtration dehydration, and recording the squeezing time, the water discharge amount and the water content of the mud cake after squeezing;

[0011] E. performing ultra-high pressure consolidation on the crushed mud cake after squeezing, and maintaining the consolidation time at 2-3h;

[0012] F. taking out the mud block after ultra-high pressure consolidation with a mud removing device, crushing the mud block to a size of 1-2cm, and then performing curing.

[0013] Preferably, as an improvement, the mud flocculating material is added first in step B, and the mud flocculating material is added in a proportion of 1-3‰ of the dry matter of the mud. After the mud particles are flocculated into groups, the solidifying agent is added, and the solidifying agent is added in a proportion of 10-30% of the dry matter of the mud. The solidifying agent can play a role in skeleton construction in dehydration, and reduce the compressibility index of the mud to less than 0.4.

[0014] Preferably, as an improvement, the pressure value of pressure filtration in step C is 0.6-0.8MPa.

[0015] Preferably, as an improvement, the dry matter filtration flux in step C is obtained by subtracting the drainage amount from the slurry sample amount at the corresponding time point.

[0016] Preferably, as an improvement, the pressure of the squeezing in step D is 1.0-2.0 MPa, and the squeezing time is 30-60 min.

[0017] Preferably, as an improvement, the mud cake in step E is broken into pieces with a particle size of less than or equal to 1 cm.

[0018] Preferably, as an improvement, the curing temperature of the broken pieces in step F is 25℃, and the curing humidity is 95%.

[0019] The application also provides a slurry dewatering-curing-ultra-high pressure consolidation integrated test device for realizing the above-mentioned slurry dewatering-curing-ultra-high pressure consolidation integrated test method, which comprises a dewatering module and an ultra-high pressure consolidation module, the dewatering module comprises a dosing tank, a slurry conditioning tank, a sample pump, a flow meter and a plate-and-frame filter press which are sequentially connected by pipelines; the dosing tank is used for storing slurry flocculating materials and curing agents, the slurry conditioning tank is provided with a speed-adjustable stirrer, the slurry conditioning tank is used for containing slurry flocculating materials, curing agents and slurry and stirring them uniformly, the sample pump is used for pumping the conditioned slurry into the plate-and-frame filter press, the flow meter is used for counting the slurry sample amount, and the plate-and-frame filter press is used for pressure filtration dewatering of the conditioned slurry, and the plate-and-frame filter press is provided with a tail water collecting device for measuring the drainage amount and the slurry reduction amount.

[0020] Preferably, as an improvement, the ultra-high pressure consolidation module comprises a mud cake breaker, an ultra-high pressure consolidation instrument and a stone crusher which are sequentially arranged, the mud cake breaker is used for breaking the mud cake after pressure filtration dewatering, the ultra-high pressure consolidation instrument is used for consolidating the broken mud cake into a mud block, and the stone crusher is used for breaking the consolidated mud block into crushed stones.

[0021] Preferably, as an improvement, the ultra-high pressure consolidation instrument has a cylindrical chamber, the broken mud cake is filled into the chamber for consolidation, and a displacement meter with a range of 0-200 mm is installed above the chamber.

[0022] In the application, the dewatering module is used to study the pressure filtration dewatering effect under the double conditioning action of flocculating and curing agents, and simultaneously realize the preliminary curing of the mud cake during pressure filtration, so as to realize a lower water content. The ultra-high pressure consolidation module is used to study the process of forming crushed stones under the coupling action of curing and ultra-high pressure consolidation of the mud cake in the presence of the formation pressure. The whole test machine can be used as a prototype machine of the future production equipment for dewatering of dredging slurry and preparation of crushed stones. The test machine can adjust the size of the corresponding test device according to the test requirements to ensure its operability and convenience, and can verify and optimize the process parameters of the whole process of dredging slurry→crushed stone. The test machine and the model test machine have the characteristics of simplicity, less workload, strong practicability, economy and reliability.

[0023] The present application relates to a kind of dehydration-solidification-ultra-high pressure consolidation integrated test method and model testing machine.Using the model testing machine and test method can be carried out to the dewatering of dredging slurry then solidification and high pressure consolidation coupling under the whole process of gravel indoor simulation test formed by effect, it is a kind of model testing machine and test method that can simultaneously test slurry dehydration efficiency, solidification effect, ultra-high pressure consolidation law Mechanical properties.The method is because the amount of slurry used, dehydration conditioning material and curing agent etc. are less, solidification process is embedded in dehydration process section and ultra-high pressure consolidation process section, a set of equipment will three process sections organically combined, improve operability, become a kind of new technology model testing machine and test method.It can provide necessary test basis for the formation and optimization of process. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the structural schematic diagram of embodiment 1 of the present application. DETAILED DESCRIPTION

[0025] The following is further detailed by specific embodiments:

[0026] The reference signs in the drawings of the specification include: dosing tank 1, slurry conditioning tank 2, sample pump 3, flow meter 4, plate-and-frame filter press 5, tail water collection device 6, mud cake crusher 7, displacement meter 8, ultra-high pressure consolidation instrument 9, gravel machine 10.

[0027] Example 1, basically as shown in the accompanying Figure 1The device is shown as follows: a mud dewatering-curing-ultra-high pressure consolidation integrated test device, which comprises a dewatering module and an ultra-high pressure consolidation module. The dewatering module comprises a dosing tank 1, a mud conditioning tank 2, a sample pump 3, a flow meter 4 and a plate-and-frame filter press 5 which are sequentially connected by pipelines. The ultra-high pressure consolidation module comprises a mud cake crusher 7, an ultra-high pressure consolidation instrument 9 and a stone crusher 10 which are sequentially arranged. The dosing tank 1 is used for storing mud flocculating materials and curing agents. The mud conditioning tank 2 is a metal tank with a radius of 20 cm, a height of 40 cm and a conical bottom, and is provided with an adjustable speed stirrer. The size and stirring rate of the mud conditioning tank 2 can be adjusted according to the test requirements. The mud conditioning tank 2 is used for containing mud flocculating materials, curing agents and mud and stirring them uniformly. The sample pump 3 is used for pumping the conditioned mud into the plate-and-frame filter press 5. The flow meter 4 is used for counting the mud sample amount. The plate-and-frame filter press 5 is used for filtering and dewatering the conditioned mud into mud cake. The plate-and-frame filter press 5 is provided with a tail water collecting device 6 which is used for measuring the drainage amount and the mud reduction amount. In the embodiment, the tail water collecting device 6 is a graduated cylinder. The mud cake crusher 7 is used for crushing the mud cake after filtering and dewatering. The ultra-high pressure consolidation instrument 9 is used for consolidating the crushed mud cake into mud blocks. The ultra-high pressure consolidation instrument 9 has a cylindrical chamber with an inner diameter of 10 cm and a height of 20 cm. The maximum consolidation pressure can reach more than 60 MPa. The crushed mud cake is filled into the chamber for consolidation. A displacement meter 8 with a range of 0-200 mm is installed above the chamber to monitor the consolidation process in real time. The stone crusher 10 is used for crushing the consolidated mud blocks into gravel.

[0028] Embodiment 2: a mud dewatering-curing-ultra-high pressure consolidation integrated test method, which is implemented by the mud dewatering-curing-ultra-high pressure consolidation integrated test device of embodiment 1, and comprises the following steps:

[0029] A. The dredging mud is injected into the mud conditioning tank 2 for conditioning before dewatering.

[0030] B. The mud flocculating materials and the curing agents are injected into the mud in the mud conditioning tank 2 through the dosing tank 1 in a certain proportion to stir and react uniformly. The mud flocculating materials are added first, and the proportion of the mud flocculating materials to the dry matter of the mud is 1-3 ‰. After the mud particles are flocculated into groups, the curing agents are added, and the proportion of the curing agents to the dry matter of the mud is 10-30%. The curing agents can play a role in skeleton construction in dewatering, and the compressibility index of the mud is reduced to less than 0.4.

[0031] C. The pressure of the sample pump 3 is controlled, and the reference pressure value is 0.4-0.6 MPa. The conditioned mud is pumped into the plate-and-frame filter press 5 for filtering and dewatering, and the drainage amount and the mud reduction amount are measured at the same time. The dry matter filtration flux per unit time is obtained by the difference between the two values, that is, the dewatering efficiency.

[0032] D, open the press pump to form mud cake by pressing the dewatered slurry, the pressure of the pressing is 1.0-2.0MPa, the pressing time is 30-60min, and the pressing time, water yield and water content of the mud cake after pressing are recorded at the same time;

[0033] E, the pressed mud cake is crushed to a particle size of less than or equal to 1cm by a mud cake crusher 7, and then filled into the chamber of the ultrahigh pressure consolidator 9 for ultrahigh pressure consolidation, the consolidation process is monitored in real time by the displacement meter 8, and the consolidation time is maintained at 2-3h;

[0034] F, the mud block after ultrahigh pressure consolidation is taken out by a desliming device, and is crushed to a size of 1-2cm for curing, the curing temperature is 25 DEG C, the curing humidity is 95%, and the curing is maintained for 28 days to form the gravel product.

[0035] The working principle of the present application is that: in the process of dewatering the dredging slurry, the use of the solidifying agent can make the slurry particles form a "mud skin" with good pore structure and reduce the compressibility index. In addition, after the mud cake is formed, the mud cake generates high-strength hydration products under the dual action of solidification and ultrahigh pressure consolidation, and the texture is dense, and after reasonable curing, the gravel with high strength can be formed.

[0036] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application to simplify the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0037] The above is only an embodiment of the present application, and the specific technical solutions and / or common knowledge of the scheme are not described in detail. It should be pointed out that for those skilled in the art, without departing from the technical solutions of the present application, a number of modifications and improvements can be made, which should also be regarded as the protection scope of the present application, and these will not affect the effect and practicality of the present application. The protection scope claimed in the present application should be subject to the content of its claims, and the specific embodiments and the like in the description can be used to explain the content of the claims.

Claims

1. An integrated test method for slurry dewatering-solidification-ultra-high pressure consolidation, characterized in that: It comprises the following steps: A. conditioning of the dredging slurry before dewatering; B. injecting the slurry flocculation material and the solidifying agent into the slurry in a certain proportion, and stirring uniformly; C. dewatering the conditioned slurry by pressure filtration, and simultaneously measuring the drainage and the slurry reduction, and obtaining the dry matter filtration flux per unit time, i.e. the dewatering efficiency, through the difference between the two; D. squeezing the slurry after pressure filtration to form a mud cake, and simultaneously recording the squeezing time, the water discharge and the water content of the mud cake after squeezing; E. crushing the mud cake after squeezing, and then performing super-high pressure consolidation for 2-3 hours; F. taking out the mud block after super-high pressure consolidation, crushing it to a size of 1-2 cm, and then curing it.

2. The integrated test method for dehydration, solidification and ultra-high pressure consolidation of slurry according to claim 1, characterized in that: In step B, the slurry flocculation material is added first, and then the solidifying agent is added after the slurry particles are flocculated into groups, so as to reduce the compressibility index of the slurry to less than 0.

4.

3. The integrated test method for dehydration, solidification and ultra-high pressure consolidation of mud according to claim 2, characterized in that: In step C, the pressure value of the pressure filtration is 0.6-0.8 MPa.

4. The integrated test method for dehydration, solidification and ultra-high pressure consolidation of slurry according to claim 3, characterized in that: In step C, the dry matter filtration flux is obtained by subtracting the drainage from the slurry sample amount at the corresponding time point.

5. The integrated test method for dehydration, solidification and ultra-high pressure consolidation of mud according to claim 4, characterized in that: In step D, the pressure of the squeezing is 1.0-2.0 MPa, and the squeezing time is 30-60 minutes.

6. The integrated test method for dehydration, solidification and ultra-high pressure consolidation of mud according to claim 5, characterized in that: In step E, the mud cake is crushed to a size of less than or equal to 1 cm.

7. The integrated test method for dehydration, solidification and ultra-high pressure consolidation of mud according to claim 6, characterized in that: In step F, the curing temperature of the crushed block is 25℃, and the curing humidity is 95%.

8. A dehydrating-curing-ultra-high pressure consolidating integrated test device for the dehydrating-curing-ultra-high pressure consolidating integrated test method according to any one of claims 1-7, characterized in that: It comprises a dewatering module and a super-high pressure consolidation module, and the dewatering module comprises a dosing tank, a slurry conditioning tank, a sample pump, a flow meter and a plate-and-frame filter press which are sequentially connected by pipelines; the dosing tank is used for storing the slurry flocculation material and the solidifying agent, the slurry conditioning tank is provided with an adjustable speed stirrer, the slurry conditioning tank is used for containing the slurry flocculation material, the solidifying agent and the slurry and stirring them uniformly, the sample pump is used for pumping the conditioned slurry into the plate-and-frame filter press, the flow meter is used for counting the slurry sample amount, and the plate-and-frame filter press is used for dewatering the conditioned slurry by pressure filtration, and the plate-and-frame filter press is provided with a tail water collecting device for measuring the drainage and the slurry reduction.

9. The integrated test apparatus for dehydrating, solidifying and ultra-high pressure consolidating of slurry according to claim 8, characterized in that: The super-high pressure consolidation module comprises a mud cake crusher, a super-high pressure consolidator and a stone crusher which are sequentially arranged, the mud cake crusher is used for crushing the mud cake after pressure filtration and dewatering, the super-high pressure consolidator is used for consolidating the crushed mud cake into a mud block, and the stone crusher is used for crushing the consolidated mud block into crushed stones.

10. The integrated test apparatus for dehydrating, solidifying and ultra-high pressure consolidating of mud according to claim 9, characterized in that: The super-high pressure consolidator has a cylindrical chamber, the crushed mud cake is filled into the chamber for consolidation, and a displacement meter with a range of 0-200 mm is installed above the chamber.

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