Eluting system for high-salt impurities in solid waste

Abstract

The utility model relates to an elution system for high-salt impurities in solid wastes. The elution system comprises a buffer bin, a weighing bin; a pre-dissolving device; a rinsing device; a filter pressing separation device; the turbidity meter is used for monitoring the turbidity of filtrate discharged by the filter-pressing separation device; the filtrate temporary storage tank is used for temporarily storing the elution filtrate; a filtrate inlet of the filtrate temporary storage tank is connected with a filtrate outlet of the turbidity meter through a filtrate switch valve; an inlet of the three-way valve is connected with a filtrate outlet of the filtrate temporary storage tank, and two outlets of the three-way valve are respectively connected with a circulating filtrate inlet of the pre-dissolving device and the wastewater treatment system; the salinity meter and the lifting pump are arranged on a pipeline between the inlet of the three-way valve and the filtrate outlet of the filtrate temporary storage tank and are used for monitoring the salinity of the filtrate and pumping the filtrate; the accident material temporary storage tank is used for temporarily storing accident materials; and an accident material outlet of the accident material temporary storage tank is connected with a slurry inlet of the rinsing device. According to the utility model, the total salinity of effluent is stable, so that the water quality fluctuation of the subsequent treatment process is small, and the operation is more stable.

Description

Technical Field

[0001] The utility model belongs to the technical field of high-salt solid waste treatment, and in particular relates to a system for eluting high-salt impurities in solid waste. Background Art

[0002] In the context of rapid industrial development, high-salt solid wastes generated by various production processes are increasing, posing a severe challenge to the environment. These solid wastes usually contain high concentrations of soluble salts, such as sodium chloride, calcium chloride, potassium chloride, etc., as well as a variety of heavy metals and toxic and hazardous substances. Direct disposal of these wastes will not only occupy a large amount of land resources, but may also cause salinization and pollution of soil and groundwater, posing a serious threat to the ecological environment and human health.

[0003] In order to effectively treat this type of high-salt solid waste, researchers are constantly exploring new technical means. Among them, water washing and salt extraction technology has attracted widespread attention due to its simple operation, low cost and significant effect. This technology mixes high-salt solid waste with water, separates salt from the waste by physical or chemical methods, and then obtains pure salt products through pretreatment, evaporation, crystallization and other steps of the filtrate. The washed solid waste can be used as production raw materials, thereby achieving the purpose of resource utilization.

[0004] The technology of washing and extracting salt from solid waste mainly includes four steps: rinsing, separation, pretreatment and refining. Rinsing is to mix solid waste with water in a certain proportion, and fully dissolve the salt in the water by stirring. Separation is to separate the dissolved salt from the solid residue by physical methods such as filtration and centrifugation. Pretreatment refers to further removing impurities through water treatment technologies such as coagulation precipitation, adsorption and membrane separation, while refining is to separate and obtain pure salt products through evaporation, crystallization and other methods.

[0005] At present, water washing and salt extraction technology is widely used in the treatment of high-salt solid waste due to its advantages of high resource utilization, simple operation, and low cost. However, in the actual production process, the salt content of different solid wastes is different, and the salt content of different batches of the same solid waste is also different, resulting in unstable salt content in the elution wastewater after rinsing, which brings certain challenges to the stable operation of subsequent pretreatment and refining processes. In addition, in the solid-liquid separation process after rinsing, solid waste often enters the subsequent process due to problems with the filtration equipment itself (such as damage to the filter cloth), affecting the operation of the overall system and increasing operating costs.

[0006] Therefore, there is an urgent need in the art to propose a system for eluting high-salt impurities in solid waste to ensure the stability of the elution wastewater quality and reduce subsequent processing costs. Utility Model Content

[0007] Based on the above-mentioned shortcomings and deficiencies in the prior art, one of the purposes of the present invention is to at least solve one or more of the above-mentioned problems in the prior art. In other words, one of the purposes of the present invention is to provide a system for eluting high-salt impurities in solid waste that meets one or more of the above-mentioned needs.

[0008] In order to achieve the above utility model purpose, the utility model adopts the following technical solutions:

[0009] A system for eluting high-salt impurities in solid waste, comprising:

[0010] The buffer bin is used to store high-salt solid waste; a stirring device is provided in the buffer bin, and a dust collector is provided in the buffer bin;

[0011] The weighing bin is used to measure the elution amount of solid waste; the solid waste inlet of the weighing bin is connected to the outlet of the buffer bin;

[0012] The pre-dissolving device has a solid waste inlet, a washing water inlet, a circulating filtrate inlet and a slurry outlet; a stirring device is provided in the pre-dissolving device, and the solid waste inlet of the pre-dissolving device is connected to the solid waste outlet of the weighing bin;

[0013] A rinsing device has a slurry inlet and a slurry outlet; a stirring device and an aeration device are arranged in the rinsing device, and the slurry inlet of the rinsing device is connected to the slurry outlet of the pre-dissolving device;

[0014] The filter press separation device is used for solid-liquid separation of slurry; the slurry inlet of the filter press separation device is connected to the slurry outlet of the rinsing device; the filter press separation device has a filter cake outlet and a filtrate outlet;

[0015] A turbidity meter, used to monitor the turbidity of the filtrate discharged from the filter press separation device, having a filtrate inlet and two filtrate outlets, wherein the filtrate inlet of the turbidity meter is connected to the filtrate outlet of the filter press separation device;

[0016] The filtrate temporary storage tank is used to temporarily store the elution filtrate; the filtrate inlet of the filtrate temporary storage tank is connected to the filtrate outlet of the turbidity meter through the filtrate switch valve; a stirring device is provided in the filtrate temporary storage tank;

[0017] A three-way valve, the inlet of the three-way valve is connected to the filtrate outlet of the filtrate temporary storage tank, and the two outlets of the three-way valve are respectively connected to the circulating filtrate inlet of the pre-dissolution device and the wastewater treatment system;

[0018] A salinity meter and a lifting pump are arranged on the pipeline between the inlet of the three-way valve and the filtrate outlet of the filtrate temporary storage tank, and are used to monitor the salinity of the filtrate and pump the filtrate;

[0019] The accident material temporary storage tank is used to temporarily store accident materials; the filtrate inlet of the accident material temporary storage tank is connected to the filtrate outlet of the turbidity meter through the accident material switch valve; a stirring device is provided in the accident material temporary storage tank; the accident material outlet of the accident material temporary storage tank is connected to the slurry inlet of the rinsing device.

[0020] As a preferred embodiment, the elution system for high-salt impurities in solid waste also includes a feeding and conveying device, which includes a feeder and a dividing screw. The feed port of the feeder is connected to the outlet of the buffer bin, the discharge port of the feeder is connected to the inlet of the dividing screw, and the outlet of the dividing screw is connected to the solid waste inlet of the weighing bin.

[0021] As a preferred solution, the buffer bin and the weighing bin are respectively provided with a material level meter, and the outlet of the buffer bin and the solid waste outlet of the weighing bin are respectively provided with a discharge valve.

[0022] As a preferred solution, the feeder is a disc feeder or a screw feeder, and the material distribution screw is used to control the material distribution direction.

[0023] As a preferred embodiment, the weighing bin includes two weighing cavities, the weighing cavities have a solid waste inlet, a solid waste outlet, a weighing instrument and a level meter, the solid waste outlet of the weighing cavity is provided with a discharge valve, the two discharge valve outlets are connected to the main discharge valve, and the main discharge valve is connected to the solid waste inlet of the pre-dissolution device.

[0024] As a preferred solution, the aeration device adopts an aeration disk or an aeration tube, and the aeration device is arranged at the bottom of the rinsing device, and the aeration device is externally connected to a compressed air inlet.

[0025] As a preferred solution, a slurry lifting pump is provided between the rinsing device and the filter press separation device, and the slurry lifting pump is a screw sludge pump or a slurry pump.

[0026] As a preferred solution, the lifting pump is a centrifugal pump.

[0027] As a preferred solution, the pipeline between the accident material outlet of the accident material temporary storage tank and the slurry inlet of the rinsing device is provided with an accident material lifting pump, and the accident material lifting pump is selected from a screw sludge pump, a pneumatic diaphragm pump or a slurry pump.

[0028] As a preferred solution, the rinsing device is a multi-stage rinsing structure.

[0029] Compared with the prior art, the utility model has the following beneficial effects:

[0030] The utility model uses an aeration device added to the rinsing device to perform aeration and stirring at the same time, so that the solid waste can be evenly washed under the combined action of aeration and stirring, and at the same time effectively prevents the solid waste from settling in the rinsing chamber;

[0031] The utility model utilizes a turbidity meter to monitor the damage of the filter cloth of the filter press separation device in real time. When the solid content of the filtrate is high, the turbidity monitoring device can control the filtrate to enter the accident material buffer device to ensure that the solid waste does not enter the subsequent process;

[0032] The utility model uses a salinity meter to control the salinity of the eluted water, so that the water quality fluctuation of the subsequent treatment process is smaller, the operation is more stable, and the economic performance is better;

[0033] The utility model utilizes a buffer bin, a feeding and conveying device, and a weighing bin to realize automatic and continuous feeding of solid waste, and accurately controls the feeding amount through the weighing instrument and the material level meter, thereby improving efficiency and greatly reducing manual operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic structural diagram of a system for eluting high-salt impurities in solid waste according to Example 1 of the utility model;

[0035] Figure 2 It is a flow chart of a system for eluting high-salt impurities in solid waste according to Example 1 of the utility model;

[0036] Reference numerals:

[0037] 1-buffer bin dust collector; 2-buffer bin; 3-buffer bin material level meter; 4-buffer bin discharge valve; 5-feeder; 6-dividing screw; 7, 12-weighing bin; 8, 13-weighing bin dust collector; 9, 14-weighing instrument; 10, 15-weighing bin material level meter; 11, 16-weighing bin discharge valve; 17-discharge main valve; 18-pre-dissolution device; 19-rinsing device; 20-aeration device; 21-slurry lifting pump; 22-filter pressure separation device; 23-turbidimeter; 24-accident material automatic valve; 25-filtrate automatic valve; 26-filtrate temporary storage tank; 27-filtrate lifting pump; 28-salinity meter; 29-automatic three-way valve; 30-accident material temporary storage tank; 31-accident material lifting pump. DETAILED DESCRIPTION

[0038] In order to more clearly illustrate the embodiments of the utility model, the specific implementation methods of the utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0039] Embodiment 1:

[0040] like Figure 1 and Figure 2As shown, the elution system of high-salt impurities in solid waste of this embodiment includes: a buffer bin 2, a feeding and conveying device, a weighing bin 7, a weighing bin 12, a pre-dissolution device 18, a rinsing device 19, a filter press separation device 22, a turbidity meter 23, a filtrate temporary storage tank 26, a salinity meter 28, and an accident material temporary storage tank 30.

[0041] The buffer bin 2 of this embodiment is used to store high-salt solid waste. Specifically, the buffer bin 2 has a solid waste inlet and outlet, a stirring device in the buffer bin, a buffer bin dust collector 1 on the top, and a buffer bin material level meter 3 on the side. In addition, the solid waste outlet of the buffer bin 2 is provided with a buffer bin discharge valve 4 to facilitate the control of discharge.

[0042] The feeding and conveying device of this embodiment includes a feeder 5 and a dividing screw 6 connected in sequence, and the inlet of the feeder 5 is connected to the cache bin discharge valve 4 at the solid waste outlet of the cache bin; the feeder 5 is a disc feeder, a screw feeder or a star feeder, and the dividing screw 6 can automatically control the dividing direction.

[0043] This embodiment adopts a two-weighing bin design: weighing bin 7 and weighing bin 12, the weighing bins have a solid waste inlet and outlet, and the solid waste inlets of the two weighing bins are respectively connected to the two outlets of the material dividing screw 6; the tops of the two weighing bins are respectively provided with a weighing bin dust collector 8 and a weighing bin dust collector 13, the two weighing bins are respectively provided with a weighing meter 9 and a weighing meter 14, the sides of the two weighing bins are respectively provided with a weighing bin material level meter 10 and a weighing bin material level meter 15, the solid waste outlets of the two weighing bins are respectively provided with a weighing bin discharge valve 11 and a weighing bin discharge valve 16, the outlets of the weighing bin discharge valve 11 and the weighing bin discharge valve 16 are respectively connected to the discharge main valve 17, and the outlet of the discharge main valve 17 is connected to the pre-dissolving device 18. The design of two weighing bins can ensure that one weighing bin is automatically fed and the other weighing bin is automatically discharged, so as to achieve continuous operation.

[0044] The pre-dissolving device 18 has a pre-dissolving chamber and a solid waste inlet, a washing water inlet, a circulating filtrate inlet and a slurry outlet connected to the pre-dissolving chamber. A stirring device is provided in the pre-dissolving chamber. The solid waste inlet of the pre-dissolving chamber is connected to the outlet of the main discharge valve 17.

[0045] The rinsing device 19 has a rinsing chamber and a slurry inlet, a compressed air inlet and a slurry outlet connected to the rinsing chamber. A stirring device and an aeration device are provided in the rinsing chamber. The slurry inlet of the rinsing chamber is connected to the slurry outlet of the pre-dissolving device 18. The aeration device adopts an aeration plate or an aeration tube, which is evenly fixed at the bottom of the rinsing chamber and has a gas inlet connected to the aeration plate or the aeration tube, and the gas inlet is connected to the compressed air inlet of the rinsing device.

[0046] The filter press separation device 22 has a filter press chamber and a slurry inlet, a filtrate outlet and a filter cake outlet connected to the filter press chamber. The slurry inlet of the filter press separation device is connected to the slurry outlet of the rinsing device, and the connecting pipeline between the two is provided with a slurry lifting pump 21. The slurry lifting pump 21 adopts a screw sludge pump or a slurry pump; the filter cake outlet is connected to the subsequent filter cake processing process.

[0047] A turbidity meter 23 (i.e., a turbidity monitoring device) is provided at the filtrate outlet of the filter press separation device 22. The turbidity meter 23 is divided into two branches, one of which is connected to the emergency material temporary storage tank 30 and an emergency material switch valve 24 is provided on the connecting pipeline, and the other is connected to the filtrate temporary storage tank 26 and a filtrate switch valve 25 is provided on the connecting pipeline.

[0048] The filtrate temporary storage tank 26 (i.e., the filtrate temporary storage device) has a temporary storage chamber and a filtrate inlet and outlet connected to the temporary storage chamber, and a stirring device is provided in the temporary storage chamber; the filtrate outlet of the filtrate temporary storage tank 26 is provided with a filtrate lifting pump 27, a salinity meter 28 (i.e., a salinity monitoring device) and a three-way valve 29 in sequence, and the two outlets of the three-way valve 29 are respectively connected to the circulating filtrate inlet of the pre-dissolution device 18 and the wastewater treatment system, so that the salinity can enter the wastewater treatment system only when it reaches the set value, thereby ensuring the stability of the salt content of the effluent. Among them, the filtrate lifting pump 27 adopts a centrifugal pump.

[0049] The accident material temporary storage tank 30 (i.e., the accident material temporary storage device) has a temporary storage chamber and an accident material inlet and an accident material outlet connected to the temporary storage chamber. A stirring device is provided in the temporary storage chamber. The accident material outlet of the temporary storage chamber is connected to the slurry inlet of the rinsing device 19, and an accident material lifting pump 31 is provided on the connected pipeline. When the filtrate of the filter press separation device 22 has a high solid content, the filtrate enters the accident material temporary storage tank 30, and the accident material is transported to the rinsing device 19 by the accident material lifting pump 31. Among them, the accident material lifting pump is selected from a screw sludge pump, a pneumatic diaphragm pump or a slurry pump.

[0050] This embodiment can realize automatic and continuous feeding of solid waste and can automatically control the feeding amount and water intake by arranging the buffer bin 2, the feeding and conveying device 5, the weighing bin and the pre-dissolving device 18 in front of the rinsing device 19.

[0051] Furthermore, the rinsing device adds an aeration device 20 in the rinsing chamber, which can perform aeration and stirring at the same time, so that the solid waste can be evenly washed under the combined action of aeration and stirring, and at the same time, the solid waste can be effectively prevented from settling in the rinsing chamber.

[0052] Furthermore, the filter press separation device 22 is a plate and frame filter press, the slurry is injected into the filter press plate through the slurry lifting pump 21, and the slurry is subjected to filter press separation through a hydraulic device.

[0053] Furthermore, the solid content of the filtrate of the filter press separation device is controlled by the turbidity meter 23 to prevent the high-solid content filtrate caused by the damage of the filter cloth of the filter press device from entering the subsequent process and affecting the operation of the subsequent process.

[0054] Furthermore, the outlet of the turbidity meter 23 is divided into two routes, one route is connected to the filtrate inlet of the filtrate temporary storage tank, and the other route is connected to the filtrate inlet of the emergency material temporary storage tank. The pipelines are respectively provided with a filtrate automatic valve 25 and an emergency material automatic valve 24. During normal operation, the filtrate enters the filtrate temporary storage tank 26 through the filtrate automatic valve.

[0055] According to actual needs, control valves are respectively set at appropriate positions in some connecting pipelines of this device to control the on-off or flow rate of the pipelines, which will not be elaborated here.

[0056] Furthermore, according to actual needs, flow meters are respectively arranged at appropriate positions in some connecting pipelines of the device to monitor the liquid flow in the pipelines, which will not be elaborated here.

[0057] Furthermore, according to actual needs, liquid level gauges are respectively arranged at appropriate positions of some tanks of the device to monitor the liquid levels of the tanks, which will not be elaborated here.

[0058] Application examples:

[0059] The fly ash from a domestic waste incineration plant in Huzhou was washed and desalted. The chloride content in the solid waste was 15-20%. The fly ash entered the buffer bin 2 from the solid waste inlet, was transported to the weighing bin by the feeding and conveying device for weighing, and then entered the solid waste inlet of the pre-dissolving device 18 through the unloading main valve 17. Tap water was added from the washing water inlet. The solid-liquid ratio of the solid waste to the washing water was 1:2. After being mixed by the stirring device, it overflowed to the rinsing device 19, and aerated at a controlled pressure of 0.4-0.6Mpa and a gas-liquid ratio of 15:1. At the same time, it was stirred at a rate of 150r / min for 30 minutes and then sent to the filter press separation device 22 by the slurry lifting pump 21 to obtain filtrate and filter cake. The filter cake enters the subsequent process for multi-stage rinsing. The filtrate passes through the turbidity monitoring device 23 and enters the filtrate temporary storage tank 26 for temporary storage. The filtrate in the filtrate temporary storage tank is circulated and rinsed by the filtrate lifting pump 27. When the salinity of the filtrate meets 230,000 mg / L, the salinity control system 28 controls the filtrate to enter the wastewater treatment system. At this time, it is measured that the calcium ion in the water is 34,000-37,000 mg / L, the chloride ion is 128,000-132,000 mg / L, the sodium ion is 28,000-29,000 mg / L, and the potassium ion is 26,000-28,000 mg / L, and the water quality fluctuates slightly.

[0060] Embodiment 2:

[0061] The elution system of high-salt impurities in solid waste of this embodiment is different from that of Example 1 in that:

[0062] Only one weighing bin is retained to simplify the structure and meet the needs of different applications;

[0063] For other structures, please refer to Example 1.

[0064] Embodiment 3:

[0065] The elution system of high-salt impurities in solid waste of this embodiment is different from that of Example 1 in that:

[0066] The rinsing device 19, the filter press separation device 22, the turbidity meter 23, the filtrate temporary storage tank 26, the salinity meter 28, and the accident material temporary storage tank 30 can be connected in series in multiple stages, and the solid waste can be rinsed in multiple stages to achieve the requirements of resource utilization;

[0067] For other structures, please refer to Example 1.

[0068] The above description is only a detailed description of the preferred embodiments and principles of the present invention. For ordinary technicians in this field, according to the ideas provided by the present invention, there will be changes in the specific implementation methods, and these changes should also be regarded as the protection scope of the present invention.

Claims

1. A system for eluting high-salt impurities in solid waste, characterized in that: include: Buffer bins for storing high-salinity solid waste; The buffer bin is equipped with a stirring device and a dust collector; Weighing bin, used to measure the elution amount of solid waste; The solid waste inlet of the weighing bin is connected to the outlet of the buffer bin; The pre-dissolving device has a solid waste inlet, a washing water inlet, a circulating filtrate inlet and a slurry outlet; a stirring device is provided in the pre-dissolving device, and the solid waste inlet of the pre-dissolving device is connected to the solid waste outlet of the weighing bin; A rinsing device has a slurry inlet and a slurry outlet; a stirring device and an aeration device are arranged in the rinsing device, and the slurry inlet of the rinsing device is connected to the slurry outlet of the pre-dissolving device; Filter press separation device, used for solid-liquid separation of slurry; The slurry inlet of the filter press separation device is connected to the slurry outlet of the rinsing device; The filter press separation device has a filter cake outlet and a filtrate outlet; A turbidity meter, used to monitor the turbidity of the filtrate discharged from the filter press separation device, having a filtrate inlet and two filtrate outlets, wherein the filtrate inlet of the turbidity meter is connected to the filtrate outlet of the filter press separation device; The filtrate temporary storage tank is used to temporarily store the elution filtrate; the filtrate inlet of the filtrate temporary storage tank is connected to the filtrate outlet of the turbidity meter through the filtrate switch valve; a stirring device is provided in the filtrate temporary storage tank; A three-way valve, the inlet of the three-way valve is connected to the filtrate outlet of the filtrate temporary storage tank, and the two outlets of the three-way valve are respectively connected to the circulating filtrate inlet of the pre-dissolution device and the wastewater treatment system; A salinity meter and a lifting pump are arranged on the pipeline between the inlet of the three-way valve and the filtrate outlet of the filtrate temporary storage tank, and are used to monitor the salinity of the filtrate and pump the filtrate; The accident material temporary storage tank is used to temporarily store accident materials; the filtrate inlet of the accident material temporary storage tank is connected to the filtrate outlet of the turbidity meter through the accident material switch valve; a stirring device is provided in the accident material temporary storage tank; the accident material outlet of the accident material temporary storage tank is connected to the slurry inlet of the rinsing device.

2. The system for eluting high-salt impurities in solid waste according to claim 1, characterized in that: It also includes a feeding and conveying device, which includes a feeder and a dividing screw. The feed port of the feeder is connected to the outlet of the buffer bin, the discharge port of the feeder is connected to the inlet of the dividing screw, and the outlet of the dividing screw is connected to the solid waste inlet of the weighing bin.

3. The system for eluting high-salt impurities in solid waste according to claim 2, characterized in that: The feeder is a disc feeder or a screw feeder, and the material distribution screw is used to control the material distribution direction.

4. The system for eluting high-salt impurities in solid waste according to claim 1, characterized in that: The buffer bin and the weighing bin are respectively provided with material level meters, and the outlet of the buffer bin and the solid waste outlet of the weighing bin are respectively provided with discharge valves.

5. The system for eluting high-salt impurities in solid waste according to claim 1, characterized in that: The weighing bin comprises two weighing cavities, each of which has a solid waste inlet, a solid waste outlet, a weighing instrument and a level meter. The solid waste outlet of the weighing cavity is provided with a discharge valve, and the two discharge valve outlets are connected to a main discharge valve, which is connected to the solid waste inlet of the pre-dissolution device.

6. The system for eluting high-salt impurities in solid waste according to claim 1, characterized in that: The aeration device adopts an aeration disk or an aeration tube, and the aeration device is arranged at the bottom of the rinsing device, and the aeration device is externally connected to a compressed air inlet.

7. The system for eluting high-salt impurities in solid waste according to claim 1, characterized in that: A slurry lifting pump is arranged between the rinsing device and the filter press separation device, and the slurry lifting pump adopts a screw sludge pump or a slurry pump.

8. The system for eluting high-salt impurities in solid waste according to claim 1, characterized in that: The lifting pump is a centrifugal pump.

9. The system for eluting high-salt impurities in solid waste according to claim 1, characterized in that: An accident material lifting pump is provided in the pipeline between the accident material outlet of the accident material temporary storage tank and the slurry inlet of the rinsing device. The accident material lifting pump is selected from a screw sludge pump, a pneumatic diaphragm pump or a slurry pump.

10. The system for eluting high-salt impurities in solid waste according to claim 1, characterized in that: The rinsing device is a multi-stage rinsing structure.

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