Method and device for washing and separating slurry

Abstract

The invention provides a slurry washing and separating method and device, and relates to the technical field of slurry separation. The N-stage countercurrent washing is carried out in the horizontal screw conveyor, the first two-stage washing and dewatering unit in the prior art is replaced, only one-time dewatering is needed, the equipment operation energy consumption can be obviously reduced, the operation is simplified, the maintenance workload is reduced, the water-cement ratio is reduced, and the water consumption for washing is small. The N horizontal spiral conveyors connected in series are adopted as the N-stage countercurrent washing device to replace the first two stages of washing and dewatering units in the prior art, so that the running power and energy consumption of the equipment can be remarkably reduced, the operation is simplified, the maintenance workload is reduced, the water-cement ratio is reduced, and the water consumption for washing is small.

Description

Technical Field

[0001] The present invention relates to the technical field of mud separation, and particularly to a method and a device for washing and separating mud. Background Art

[0002] Municipal solid waste incineration fly ash is one of the mud raw materials and belongs to hazardous waste. The municipal solid waste incineration fly ash contains chlorides. After being washed and recycled, it can be used as a raw material for a cement kiln, and the water after the chloride recovery washing needs to be recycled. Therefore, the water consumption for fly ash washing is a very important factor in the washing process.

[0003] The existing fly ash water washing technology generally adopts a method of three-stage dehydration-countercurrent washing for mud cleaning and separation. First, the initial mud and the concentrated washing water from the previous stage are mixed and washed in a stirring tank, and then the first dehydration is carried out by a dehydrator (plate and frame filter press or horizontal screw centrifuge). A large amount of dissolved substances are contained in the concentrated water obtained from the first dehydration, and the dissolved substances can be recovered by evaporation after pretreatment; the filter cake after the first dehydration still contains dissolved substances, which need to be washed a second time in the next stirring tank with the washing water for the third dehydration, and then the second dehydration is carried out again by the dehydrator. The filter cake obtained from the second dehydration is washed a third time with the washing water from the previous stage, and then the third dehydration is carried out again by the dehydrator.

[0004] However, the above method for mud cleaning and separation has the following defects: three-stage dehydration-countercurrent washing is required. When using a plate and frame filter press for dehydration, the filter cloth needs to be replaced regularly, and the replacement workload is very large. The filter cloth of the first-stage and second-stage plate and frame filter presses needs to be replaced once a month, the operation is complex, and the equipment energy consumption of the three-stage plate and frame filter press and the horizontal screw centrifuge is very high, resulting in a high cost for mud cleaning and separation. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a method and a device for washing and separating mud. The method for washing and separating mud provided by the present invention only requires one dehydration, with simple operation and low energy consumption.

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

[0007] The present invention provides a method for washing and separating mud, comprising the following steps:

[0008] Mix the raw materials and water for the first time to obtain a mixed mud; the raw materials include one or more of mud, ore powder, cement kiln bypass ash, fly ash generated by incineration, and fly ash generated by burning.

[0009] The mixed slurry is subjected to N-stage countercurrent washing to obtain the N-stage concentrated slurry and the N-stage washing water; N≥3; during the N-stage countercurrent washing process, the washing water obtained from the first-stage countercurrent washing is used to recover soluble substances, the washing water obtained from the second-stage countercurrent washing is recycled to the first mixing, and the washing water obtained from the 3rd to Nth stage countercurrent washing is recycled to the previous stage of countercurrent washing; the N-stage countercurrent washing is carried out in a horizontal screw conveyor;

[0010] The N-stage concentrated slurry and water are secondarily mixed and dehydrated to obtain clean slurry and filtrate respectively, and the filtrate is recycled to the N-stage countercurrent washing.

[0011] Preferably, the mass ratio of water to solid in the mixed slurry is 1.5 to 10:1.

[0012] Preferably, the flow rate of the mixed slurry during the N-stage countercurrent washing is 5 to 100 m 3 / h.

[0013] Preferably, the flow rate of water during the second mixing process is 2 to 45 m 3 / h.

[0014] Preferably, N is any integer from 3 to 200.

[0015] The present invention also provides a device adopting the method of the above technical solution. According to the slurry flow direction, it sequentially includes a first stirring tank 1, N series-connected horizontal screw conveyors 2, a second stirring tank 3 and a dehydrator 4; a lifting device 5 is arranged between two adjacent horizontal screw conveyors;

[0016] Among the N series-connected horizontal screw conveyors 2, each horizontal screw conveyor is provided with a slurry inlet, a slurry outlet and a water outlet. The water outlet of the second horizontal screw conveyor 22 is communicated with the water inlet of the first stirring tank 1. The 2nd to Nth horizontal screw conveyors are also provided with water inlets. The water outlets of the 3rd to Nth horizontal screw conveyors are communicated with the water inlets of the previous horizontal screw conveyor;

[0017] A first pump 6 is arranged between the first stirring tank 1 and the first horizontal screw conveyor 21;

[0018] A second pump 7 is arranged between the second stirring tank 3 and the dehydrator 4;

[0019] The water outlet of the dehydrator 4 is communicated with the water inlet of the Nth horizontal screw conveyor 24 through a third pump 8.

[0020] Preferably, the lifting device includes a low-lift water pump or a hoist; the lift of a single low-lift water pump is 1 to 5 meters.

[0021] Preferably, the frequencies of the first pump 6, the second pump 7, the third pump 8 and the single lifting device are independently 15 - 50 Hz.

[0022] Preferably, the power of a single horizontal screw conveyor is 0.75 - 4 kW, and the frequency is 5 - 50 Hz.

[0023] Preferably, the total power of the horizontal screw conveyor and the lifting device is 30 - 120 kW.

[0024] Compared with the prior art, the present invention performs N - stage counter - current washing in a horizontal screw conveyor, replacing the first two - stage washing and dewatering units in the existing process. Only one - time dewatering is required, which can significantly reduce the energy consumption of equipment operation, simplify the operation, reduce the maintenance workload, reduce the water - ash ratio, and have a small washing water consumption. The present invention uses N series - connected horizontal screw conveyors as the device for N - stage counter - current washing, replacing the first two - stage washing and dewatering units in the existing process, which can significantly reduce the power and energy consumption of equipment operation, simplify the operation, reduce the maintenance workload and reduce the water - ash ratio, and have a small washing water consumption. Description of the Drawings

[0025] Figure 1 The device used for mud washing and separation in the present invention, wherein 1 is the first stirring tank, 2 is the horizontal screw conveyor, 21 is the first horizontal screw conveyor, 22 is the second horizontal screw conveyor, 23 is the (N - 1)th horizontal screw conveyor, 24 is the Nth horizontal screw conveyor, 3 is the second stirring tank, 4 is the dewatering machine, 5 is the lifting device, 51 is the first lifting device, 52 is the second lifting device, 53 is the (N - 1)th lifting device, 54 is the Nth lifting device, 6 is the first pump, 7 is the second pump, 8 is the third pump, and 9 is the filtrate tank. Detailed Embodiments

[0026] The present invention provides a method for mud washing and separation, comprising the following steps:

[0027] First, mix the raw materials and water to obtain mixed mud; the raw materials include one or more of mud, ore powder, cement kiln bypass ash, fly ash generated by incineration, and fly ash generated by burning.

[0028] Perform N - stage counter - current washing on the mixed mud to obtain the Nth - stage concentrated mud and the Nth - stage washing water; N≥3; during the N - stage counter - current washing process, the washing water obtained from the first - stage counter - current washing is used to recover soluble substances, the washing water obtained from the second - stage counter - current washing is recycled for the first mixing, and the washing water obtained from the 3rd - Nth - stage counter - current washing is recycled for the previous - stage counter - current washing; the N - stage counter - current washing is performed in a horizontal screw conveyor.

[0029] Mix the Nth-stage concentrated slurry and water for the second time for dehydration to obtain clean slurry and filtrate respectively, and the filtrate is recycled for the Nth-stage countercurrent washing.

[0030] Unless otherwise specified, the materials and equipment used in the present invention are all commercially available products in the art.

[0031] In the present invention, the raw materials and water are mixed for the first time to obtain a mixed slurry.

[0032] In the present invention, the raw materials include one or more of slurry, ore powder, cement kiln bypass ash, fly ash generated by incineration, and fly ash generated by incineration; the slurry preferably includes slurry from river beds; the fly ash generated by incineration preferably includes fly ash generated by coal incineration; the fly ash generated by incineration preferably includes fly ash generated by incineration of one or more of domestic waste, industrial waste, medical waste, and coal.

[0033] In the present invention, the mass ratio of water to solids in the mixed slurry (denoted as the water-to-ash ratio) is preferably 1.5 to 10:1, and in specific embodiments, it can be 1.5:1, 1.6:1, 1.7:1, 1.8:1, 1.9:1, 2:1, 2.2:1, 2.5:1, 2.8:1, 3:1, 3.5:1, 4:1, 4.5:1, 5:1, 5.5:1, 6:1, 6.5:1, 7:1, 7.5:1, 8:1, 8.5:1, 9:1, 9.5:1, or 10:1.

[0034] In the present invention, the flow rate of the mixed slurry during the N-stage countercurrent washing process is preferably 5 to 100 m 3 / h, and in specific embodiments, it can be 5 m 3 / h, 10 m 3 / h, 15 m 3 / h, 20 m 3 / h, 25 m 3 / h, 30 m 3 / h, 35 m 3 / h, 40 m 3 / h, 45 m 3 / h, 50 m 3 / h, 55 m 3 / h, 60 m 3 / h, 65 m 3 / h, 70 m 3 / h, 75 m 3 / h, 80 m 3 / h, 85 m 3 / h, 90 m 3 / h, 95 m 3 / h or 100 m 3 / h.

[0035] After obtaining the mixed mud, the present invention performs N-stage countercurrent washing on the mixed mud to obtain the N-stage concentrated mud and the N-stage washing water; N≥3; during the N-stage countercurrent washing process, the washing water obtained from the first-stage countercurrent washing is used to recover soluble substances, the washing water obtained from the second-stage countercurrent washing is recycled to the first mixing, and the washing water obtained from the 3rd to Nth stage countercurrent washing is recycled to the previous stage of countercurrent washing; the N-stage countercurrent washing is carried out in a horizontal screw conveyor. In the present invention, N is preferably any integer from 3 to 200, and in specific embodiments, it can be 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190 or 200.

[0036] After obtaining the N-stage concentrated mud, the present invention second-mixes the N-stage concentrated mud and water, performs dehydration, and respectively obtains clean mud and filtrate, and the filtrate is recycled to the N-stage countercurrent washing.

[0037] In the present invention, the flow rate of water during the second mixing process is preferably 2-45 m 3 / h, and in specific embodiments, it can be 2 m 3 / h, 5 m 3 / h, 8 m 3 / h, 8.2 m 3 / h, 8.5 m 3 / h, 10 m 3 / h, 12 m 3 / h, 15 m 3 / h, 18 m 3 / h, 20 m 3 / h, 25 m 3 / h, 30 m 3 / h, 35 m 3 / h, 40 m 3 / h or 45 m 3 / h.

[0038] Figure 1 is a schematic structural diagram of the device adopted for mud washing and separation in the present invention. The following will be combined with Figure 1 to describe the device in detail.

[0039] The present invention also provides a device adopted for the method of the above technical solution. According to the mud flow direction, it sequentially includes a first stirring tank 1, N series-connected horizontal screw conveyors 2, a second stirring tank 3, and a dehydrator 4; a lifting device 5 is arranged between two adjacent horizontal screw conveyors;

[0040] Among the N horizontally arranged screw conveyors 2 connected in series, each horizontal screw conveyor is provided with a mud inlet, a mud outlet and a water outlet. The water outlet of the second horizontal screw conveyor 22 is communicated with the water inlet of the first stirring tank 1. The second to Nth horizontal screw conveyors are also provided with water inlets. The water outlets of the third to Nth horizontal screw conveyors are communicated with the water inlets of the previous horizontal screw conveyor.

[0041] A first pump 6 is arranged between the first stirring tank 1 and the first horizontal screw conveyor 21.

[0042] A second pump 7 is arranged between the second stirring tank 3 and the dehydrator 4.

[0043] The water outlet of the dehydrator 4 is communicated with the water inlet of the Nth horizontal screw conveyor 24 through a third pump 8.

[0044] In the present invention, the lifting device preferably includes a low-lift water pump or a hoist; the lift of a single low-lift water pump is preferably 1 to 5 meters, and in specific embodiments, it can be 1 meter, 1.2 meters, 1.5 meters, 1.8 meters, 2 meters, 2.2 meters, 2.5 meters, 3 meters, 3.5 meters, 4 meters, 4.5 meters or 5 meters.

[0045] In the present invention, the frequencies of the first pump 6, the second pump 7, the third pump 8 and a single lifting device are preferably 15 to 50 Hz, and in specific embodiments, they can be 15 Hz, 20 Hz, 25 Hz, 27 Hz, 29 Hz, 30 Hz, 31 Hz, 31.5 Hz, 32 Hz, 32.5 Hz, 33 Hz, 33.5 Hz, 34 Hz, 34.5 Hz, 35 Hz, 35.5 Hz, 36 Hz, 36.5 Hz, 37 Hz, 38 Hz, 39 Hz, 40 Hz, 45 Hz or 50 Hz. In the present invention, the lifting device is preferably a variable-frequency lifting device; the first pump 6, the second pump 7 and the third pump 8 are preferably fixed-frequency pumps or variable-frequency pumps.

[0046] In the present invention, the lift of the first pump 6 is preferably 25 to 35 meters, and in specific embodiments, it can be 25 meters, 26 meters, 27 meters, 28 meters, 29 meters, 30 meters, 31 meters, 32 meters, 33 meters, 34 meters or 35 meters; the flow rate of the first pump 6 is preferably 14 to 30 m 3 / h, and in specific embodiments, it can be 14 m 3 / h, 14.6 m 3 / h, 14.8 m 3 / h, 15 m 3 / h, 15.5 m 3 / h, 15.8 m 3 / h, 16 m 3 / h, 18 m 3 / h, 20 m3 / h, 25 m 3 / h or 30 m 3 / h.

[0047] In the present invention, the head of the second pump 7 is preferably 75 - 85 meters, and in specific embodiments, it can be 75 meters, 76 meters, 77 meters, 78 meters, 79 meters, 80 meters, 81 meters, 82 meters, 83 meters, 84 meters or 85 meters; the flow rate of the second pump 7 is preferably 80 - 150 m 3 / h, and in specific embodiments, it can be 80 m 3 / h, 90 m 3 / h, 100 m 3 / h, 110 m 3 / h, 120 m 3 / h, 130 m 3 / h, 140 m 3 / h or 150 m 3 / h.

[0048] In the present invention, the head of the third pump 8 is preferably 30 - 35 meters, and in specific embodiments, it can be 30 meters, 31 meters, 32 meters, 33 meters, 34 meters or 35 meters; the flow rate of the third pump 8 is preferably 23 - 50 m 3 / h, and in specific embodiments, it can be 23 m 3 / h, 23.5 m 3 / h, 23.8 m 3 / h, 24 m 3 / h, 24.5 m 3 / h, 25 m 3 / h, 26 m 3 / h, 26.5 m 3 / h, 27 m 3 / h, 27.5 m 3 / h, 28 m 3 / h, 30 m 3 / h, 35 m 3 / h, 40 m 3 / h, 45 m 3 / h or 50 m 3 / h.

[0049] In the present invention, the power of a single horizontal screw conveyor is preferably 0.75 - 4 kW, and in specific embodiments, it can be 0.75 kW, 1 kW, 1.5 kW, 2 kW, 2.5 kW, 3 kW, 3.5 kW, or 4 kW; the frequency of a single horizontal screw conveyor is preferably 5 - 50 Hz, and in specific embodiments, it can be 5 Hz, 10 Hz, 15 Hz, 20 Hz, 25 Hz, 30 Hz, 35 Hz, 40 Hz, 45 Hz, or 50 Hz. In the present invention, the horizontal screw conveyor is preferably a variable-frequency horizontal screw conveyor or a fixed-frequency horizontal screw conveyor; the frequency of the horizontal screw conveyor is preferably 15 - 50 Hz, and in specific embodiments, it can be 15 Hz, 20 Hz, 25 Hz, 27 Hz, 29 Hz, 30 Hz, 31 Hz, 31.5 Hz, 32 Hz, 32.5 Hz, 33 Hz, 33.5 Hz, 34 Hz, 34.5 Hz, 35 Hz, 35.5 Hz, 36 Hz, 36.5 Hz, 37 Hz, 38 Hz, 39 Hz, 40 Hz, 45 Hz, or 50 Hz.

[0050] In the present invention, the total power of the horizontal screw conveyor and the lifting device is preferably 50 kW.

[0051] The device provided by the present invention preferably further includes a filtrate tank 9. The water inlet of the filtrate tank 9 is communicated with the water outlet of the dehydrator 4, and the water outlet of the filtrate tank 9 is communicated with the water inlet of the Nth horizontal screw conveyor 24.

[0052] In the present invention, the dehydrator preferably includes a plate-and-frame filter press or a scroll centrifuge.

[0053] The following details the mud washing and separation in combination with the device.

[0054] Mix the raw materials and water in the first stirring tank 1 for the first time to obtain mixed mud; the raw materials include one or more of mud, ore powder, fly ash generated from coal incineration, and fly ash generated from garbage incineration.

[0055] Perform N-stage countercurrent washing on the mixed mud in N series-connected horizontal screw conveyors 2 to obtain the Nth-stage concentrated mud and the Nth-stage washing water; N≥3; during the N-stage countercurrent washing process, the washing water obtained from the first-stage countercurrent washing is used to recover soluble substances, the washing water obtained from the second-stage countercurrent washing is refluxed to the first stirring tank for the first mixing, and the washing water obtained from the 3rd - Nth-stage countercurrent washing is refluxed to the previous-stage horizontal screw conveyor for countercurrent washing; the mixed mud is transported to the first horizontal screw conveyor 21 by the first pump 6, and the concentrated mud obtained from the 2nd - (N - 1)th-stage countercurrent washing is transported to the next horizontal screw conveyor by the lifting device 5.

[0056] The Nth-stage concentrated slurry is transported to the second stirring tank 3 through the Nth lifting device 54, secondarily mixed with water, and then transported to the dehydrator 4 through the second pump 7 for dehydration to obtain clean slurry and filtrate respectively. The filtrate flows back to the Nth horizontal screw conveyor 24 for the Nth-stage countercurrent washing.

[0057] In the present invention, the N-stage countercurrent washing preferably includes the following steps:

[0058] S1 The mixed slurry is transported to the first horizontal screw conveyor 21 through the first pump 6 for the first-stage countercurrent washing to obtain the first-stage washing water and the first-stage concentrated slurry respectively. The first-stage washing water is used to recover soluble substances.

[0059] S2 The first-stage concentrated slurry is transported to the second horizontal screw conveyor 22 through the first lifting device 51 for the second-stage countercurrent washing to obtain the second-stage washing water and the second-stage concentrated slurry respectively. The second-stage washing water flows back to the first stirring tank 1 for the first mixing.

[0060] S3 The second-stage concentrated slurry is transported to the third horizontal screw conveyor for the third-stage countercurrent washing through the second lifting device 52 to obtain the third-stage washing water and the third-stage concentrated slurry respectively. The third-stage washing water flows back to the second horizontal screw conveyor 2 for countercurrent washing.

[0061] S4 The (N - 1)th-stage concentrated slurry is transported to the Nth horizontal screw conveyor 54 through the (N - 1)th lifting device 53 for the Nth-stage countercurrent washing to obtain the Nth-stage washing water and the Nth-stage concentrated slurry respectively. The Nth-stage washing water flows back to the (N - 1)th horizontal screw conveyor 23 for countercurrent washing.

[0062] S5 The Nth-stage concentrated slurry is transported to the second stirring tank 3 through the Nth lifting device 54, secondarily mixed with water, and then transported to the dehydrator 4 through the second pump 7 for dehydration to obtain clean slurry and filtrate respectively. The filtrate flows back to the Nth horizontal screw conveyor 24 for countercurrent washing.

[0063] In the prior art, the method of washing and separating mud using a plate and frame filter press occupies a large area. At the same time, due to the damage of the filter cloth, the on-site working environment and hygiene are relatively poor, and there are also the following problems: 1) The operating power is relatively high; 2) In the entire process flow, 3 dewatering machines (plate and frame filter presses) are required. The operation of the plate and frame filter press is complex. A large amount of manual assistance is required for mud discharging from the first-stage and second-stage plate and frame, while almost no manual assistance is required for mud discharging from the third-stage plate and frame; 3) The filter cloth on the plate and frame needs to be replaced regularly, and the replacement workload is very large. For the first-stage and second-stage filter cloths of municipal solid waste incineration fly ash, they need to be replaced once a month, while the third-stage only needs to be replaced once a year, and the replacement workload is greatly reduced; 4) The feed pump and the working pressure of the plate and frame filter press are very high, and the head needs to be 80 meters, which poses a certain safety hazard; 5) The water consumption is relatively large, and the water-to-ash ratio is large. In the prior art, the method of washing and separating mud using a horizontal scroll centrifuge occupies a relatively small area, but the equipment is expensive, and there are also the following problems: 1) The operating power is extremely high; 2) In the entire process flow, 6 dewatering machines are required, and chemical agents need to be added to assist in dewatering; 3) The filter screen of the centrifuge is prone to clogging and needs to be cleaned regularly every month, and the cleaning workload is very large; 4) The feed pump and the working pressure of the horizontal scroll centrifuge are very high, and the head needs to be 30 meters, which poses a certain safety hazard; 5) The water consumption is relatively large, and the water-to-ash ratio is large. However, the present invention uses multiple horizontal screw conveyors to form an integrated device to replace the first 2-stage washing and dewatering units in the existing process, which can significantly reduce the energy consumption of equipment operation, simplify the operation, reduce the maintenance workload, and reduce the water-to-ash ratio.

[0064] To further illustrate the present invention, the method and device for washing and separating mud provided by the present invention will be described in detail below in conjunction with embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0065] Embodiment 1

[0066] Adopt Figure 1 The described process flow chart for mud washing and separation, and the steps are as follows:

[0067] Mix the raw materials and water in the first mixing tank 1 for the first time to obtain mixed mud;

[0068] Transport the mixed mud to the first horizontal screw conveyor 21 through the first pump 6 for the first-stage countercurrent washing to obtain the first-stage washing water and the first-stage concentrated mud respectively; the first-stage washing water is used to recover soluble substances;

[0069] Transport the first-stage concentrated mud to the second horizontal screw conveyor 22 through the first lifting device 51 for the second-stage countercurrent washing to obtain the second-stage washing water and the second-stage concentrated mud respectively; the second-stage washing water is refluxed to the first mixing tank 1 for the first mixing;

[0070] The second-stage concentrated slurry is conveyed by the second lifting device 52 to the third horizontal screw conveyor for third-stage countercurrent washing, respectively obtaining third-stage washing water and third-stage concentrated slurry; the third-stage washing water is refluxed to the second horizontal screw conveyor 22 for countercurrent washing;

[0071] The third-stage concentrated slurry is conveyed by the third lifting device to the fourth horizontal screw conveyor for fourth-stage countercurrent washing, respectively obtaining fourth-stage washing water and fourth-stage concentrated slurry; the fourth-stage washing water is refluxed to the third horizontal screw conveyor for countercurrent washing;

[0072] The fourth-stage concentrated slurry is conveyed by the fourth lifting device to the fifth horizontal screw conveyor for fifth-stage countercurrent washing, respectively obtaining fifth-stage washing water and fifth-stage concentrated slurry; the fifth-stage washing water is refluxed to the fourth horizontal screw conveyor for countercurrent washing;

[0073] The fifth-stage concentrated slurry is conveyed by the fifth lifting device to the sixth horizontal screw conveyor for sixth-stage countercurrent washing, respectively obtaining sixth-stage washing water and sixth-stage concentrated slurry; the sixth-stage washing water is refluxed to the fifth horizontal screw conveyor for countercurrent washing;

[0074] The sixth-stage concentrated slurry is conveyed by the sixth lifting device to the seventh horizontal screw conveyor 2 for seventh-stage countercurrent washing, respectively obtaining seventh-stage washing water and seventh-stage concentrated slurry; the seventh-stage washing water is refluxed to the sixth horizontal screw conveyor 2 for countercurrent washing;

[0075] The seventh-stage concentrated slurry is conveyed by the seventh lifting device to the eighth horizontal screw conveyor for eighth-stage countercurrent washing, respectively obtaining eighth-stage washing water and eighth-stage concentrated slurry; the eighth-stage washing water is refluxed to the seventh horizontal screw conveyor for countercurrent washing;

[0076] The eighth-stage concentrated slurry is conveyed by the eighth lifting device to the ninth horizontal screw conveyor for ninth-stage countercurrent washing, respectively obtaining ninth-stage washing water and ninth-stage concentrated slurry; the ninth-stage washing water is refluxed to the eighth horizontal screw conveyor for countercurrent washing;

[0077] The ninth-stage concentrated slurry is conveyed by the ninth lifting device to the tenth horizontal screw conveyor for tenth-stage countercurrent washing, respectively obtaining tenth-stage washing water and tenth-stage concentrated slurry; the tenth-stage washing water is refluxed to the ninth horizontal screw conveyor for countercurrent washing;

[0078] The 10th-stage concentrated slurry is transported to the second stirring tank 3 by the 10th lifting device 5, secondarily mixed with water, and then transported to the plate and frame filter press 4 by the second pump 7 for dehydration to obtain clean slurry (filter cake) and filtrate respectively. The filtrate is returned to the 10th horizontal screw conveyor for countercurrent washing.

[0079] Among them, the raw material is fly ash generated from garbage incineration in Quzhou area, the soluble substance contained is chlorine-containing industrial salt, the chlorine content is 18 wt%, and the water-to-ash ratio of the mixed slurry is 4:1; during the N-stage countercurrent washing process, the flow rate of the mixed slurry is 20 m 3 / h; the total operating power of the 10 horizontal screw conveyors and 10 lifting devices is 50 kW; the variable-frequency horizontal screw conveyor has a frequency range of 5 - 50 Hz; the variable-frequency lifting device has a frequency range of 15 - 50 Hz and a lift of 1.5 meters; the lift of the first pump 6 is 30 meters, the flow rate is 30 m 3 / h, and the frequency is 50 Hz; the lift of the second pump 7 is 80 meters, the flow rate is 150 m 3 / h, and the frequency is 50 Hz; the lift of the third pump 8 is 32 meters, the flow rate is 50 m 3 / h, and the frequency is 50 Hz; the flow rate of water (denoted as the clear water flow rate) during the secondary mixing process is 8 m 3 / h; the water content of the clean slurry is 35%; based on the dry weight of the clean slurry, the chlorine content is less than 0.9 wt%.

[0080] Example 2

[0081] The slurry washing and separation is carried out according to the method of Example 1. The difference from Example 1 is only that: the raw material is fly ash generated from garbage incineration in Shaoxing area, the chlorine content is 15 wt%, and the flow rate of the mixed slurry during the N-stage countercurrent washing process is 25 m 3 / h; the total operating power of the 10 horizontal screw conveyors and 10 elevators is 50 kW; the clear water flow rate is 8.5 m 3 / h; the water content of the clean slurry is 35%; based on the dry weight of the clean slurry, the chlorine content is less than 0.9 wt%.

[0082] Example 3

[0083] The slurry washing and separation is carried out according to the method of Example 1. The difference from Example 1 is only that: the raw material is fly ash generated from garbage incineration in Huzhou area, the chlorine content is 20 wt%, and the flow rate of the mixed slurry during the N-stage countercurrent washing process is 19 m 3 / h; the total operating power of the 10 horizontal screw conveyors and 10 elevators is 50 kW; the clear water flow rate is 8.2 m 3 / h; the water content of the clean slurry is 35%; based on the dry weight of the clean slurry, the chlorine content is less than 0.9 wt%.

[0084] Example 4

[0085] In October, the actual mud washing and separation was carried out according to the method of Example 1. The difference from Example 1 was only that:

[0086] The raw materials were fly ash generated from municipal solid waste incineration and bypass ash from a cement kiln (referring to particulate matter containing harmful volatile substances discharged through a bypass air release facility in the cement kiln system).

[0087] 12-stage countercurrent washing was performed. The serial numbers of the horizontal screw conveyors were 1 to 12 in sequence. Among them, the horizontal screw conveyors numbered 1 to 10 were equipped with variable-frequency motors with a frequency range of 5 to 50 Hz, and the horizontal screw conveyors numbered 11 to 12 were fixed-frequency motors with a frequency of 20 Hz; the serial numbers of the lifting equipment were 1 to 12 in sequence, and the head of the lift pump was 1.5 meters for all; the total operating power of the 12 horizontal screw conveyors and 12 lift pumps was 120 kW; the head of the first pump 6 was 30 meters and the frequency was 50 Hz; the head of the second pump 7 was 75 meters and the frequency was 50 Hz; the head of the third pump 8 was 33 meters and the frequency was 50 Hz; the water-cement ratio is shown in Table 1, and other conditions were as follows.

[0088] On October 2: The frequency of the 1st lift pump was 35 Hz, the frequency of the 2nd lift pump was 35 Hz, the frequencies of the 3rd to 10th lift pumps were 32 Hz, the frequency of the 11th lift pump was 35 Hz, and the frequency of the 12th lift pump was 43 Hz; the average sludge concentration was 270 g / L; the flow rate of the first pump 6 was 14 m 3 / h; the flow rate of the second pump 7 was 80 m 3 / h; the flow rate of the third pump 8 was 23 m 3 / h; the flow rate of the clear water was 8 m 3 / h.

[0089] On October 3: The frequency of the 1st lift pump was 33.5 Hz, the frequency of the 2nd lift pump was 35 Hz, the frequencies of the 3rd to 10th lift pumps were 30 Hz, the frequency of the 11th lift pump was 33 Hz, and the frequency of the 12th lift pump was 40 Hz; the average sludge concentration was 250 g / L; the flow rate of the first pump 6 was 14 m 3 / h; the flow rate of the second pump 7 was 80 m 3 / h; the flow rate of the third pump 8 was 23 m 3 / h; the flow rate of the clear water was 8.3 m 3 / h.

[0090] On October 4: The frequency of the 1st lift pump was 33.5 Hz, the frequency of the 2nd lift pump was 35 Hz, the frequencies of the 3rd to 10th lift pumps were 30 Hz, the frequency of the 11th lift pump was 33 Hz, and the frequency of the 12th lift pump was 40 Hz; the average sludge concentration was 270 g / L; the flow rate of the first pump 6 was 14 m 3 / h; the flow rate of the second pump 7 was 80 m3 / h; The flow rate of the third pump 8 is 23 m 3 / h; The clear water flow rate is 7.8 m 3 / h.

[0091] October 5th: The frequency of the No. 1 lift pump is 34 Hz, the frequency of the No. 2 lift pump is 35.5 Hz, the frequencies of the lift pumps 3 - 10 are 30 Hz, the frequency of the No. 11 lift pump is 33 Hz, and the frequency of the No. 12 lift pump is 40 Hz; The average sludge concentration is 255 g / L; The flow rate of the first pump 6 is 14.8 m 3 / h; The flow rate of the second pump 7 is 80 m 3 / h; The flow rate of the third pump 8 is 24 m 3 / h; The clear water flow rate is 8.2 m 3 / h.

[0092] October 6th: The frequency of the No. 1 lift pump is 36 Hz, the frequency of the No. 2 lift pump is 39 Hz, the frequencies of the lift pumps 3 - 10 are 33 Hz, the frequency of the No. 11 lift pump is 36 Hz, and the frequency of the No. 12 lift pump is 44 Hz; The average sludge concentration is 260 g / L; The flow rate of the first pump 6 is 14.6 m 3 / h; The flow rate of the second pump 7 is 80 m 3 / h; The flow rate of the third pump 8 is 23.8 m 3 / h; The clear water flow rate is 8 m 3 / h.

[0093] October 7th: The frequency of the No. 1 lift pump is 34.5 Hz, the frequency of the No. 2 lift pump is 36 Hz, the frequencies of the lift pumps 3 - 10 are 30 Hz, the frequency of the No. 11 lift pump is 33 Hz, and the frequency of the No. 12 lift pump is 40 Hz; The average sludge concentration is 258 g / L; The flow rate of the first pump 6 is 14 m 3 / h; The flow rate of the second pump 7 is 80 m 3 / h; The flow rate of the third pump 8 is 23 m 3 / h; The clear water flow rate is 8 m 3 / h.

[0094] October 8th: The frequency of the No. 1 lift pump is 33 Hz, the frequency of the No. 2 lift pump is 34 Hz, the frequencies of the lift pumps 3 - 10 are 29 Hz, the frequency of the No. 11 lift pump is 31 Hz, and the frequency of the No. 12 lift pump is 38.5 Hz; The average sludge concentration is 270 g / L; The flow rate of the first pump 6 is 16 m 3 / h; The flow rate of the second pump 7 is 80 m 3 / h; The flow rate of the third pump 8 is 26 m 3 / h; The clear water flow rate is 8.3 m 3 / h.

[0095] October 9th: The frequency of Lift Pump No. 1 is 34.5 Hz, the frequency of Lift Pump No. 2 is 36 Hz, the frequencies of Lift Pumps No. 3 - 10 are 31 Hz, the frequency of Lift Pump No. 11 is 34 Hz, and the frequency of Lift Pump No. 12 is 41.5 Hz; the average sludge concentration is 270 g / L; the flow rate of the first pump 6 is 15.8 m 3 / h; the flow rate of the second pump 7 is 80 m 3 / h; the flow rate of the third pump 8 is 26 m 3 / h; the clear water flow rate is 8 m 3 / h.

[0096] October 10th: The frequency of Lift Pump No. 1 is 34 Hz, the frequency of Lift Pump No. 2 is 35.5 Hz, the frequencies of Lift Pumps No. 3 - 10 are 30 Hz, the frequency of Lift Pump No. 11 is 34 Hz, and the frequency of Lift Pump No. 12 is 40.5 Hz; the average sludge concentration is 265 g / L; the flow rate of the first pump 6 is 15.8 m 3 / h; the flow rate of the second pump 7 is 80 m 3 / h; the flow rate of the third pump 8 is 26.5 m 3 / h; the clear water flow rate is 8.1 m 3 / h.

[0097] October 11th: The frequency of Lift Pump No. 1 is 33.5 Hz, the frequency of Lift Pump No. 2 is 34 Hz, the frequencies of Lift Pumps No. 3 - 10 are 30 Hz, the frequency of Lift Pump No. 11 is 33 Hz, and the frequency of Lift Pump No. 12 is 40 Hz; the average sludge concentration is 280 g / L; the flow rate of the first pump 6 is 16 m 3 / h; the flow rate of the second pump 7 is 80 m 3 / h; the flow rate of the third pump 8 is 27 m 3 / h; the clear water flow rate is 8.3 m 3 / h.

[0098] October 12th: The frequency of Lift Pump No. 1 is 33.5 Hz, the frequency of Lift Pump No. 2 is 34 Hz, the frequencies of Lift Pumps No. 3 - 10 are 30 Hz, the frequency of Lift Pump No. 11 is 33 Hz, and the frequency of Lift Pump No. 12 is 40 Hz; the average sludge concentration is 280 g / L; the flow rate of the first pump 6 is 16 m 3 / h; the flow rate of the second pump 7 is 80 m 3 / h; the flow rate of the third pump 8 is 27 m 3 / h; the clear water flow rate is 8.3 m 3 / h.

[0099] October 13th: The frequency of Lift Pump No. 1 is 33 Hz, the frequency of Lift Pump No. 2 is 33 Hz, the frequencies of Lift Pumps No. 3 - 10 are 29 Hz, the frequency of Lift Pump No. 11 is 33 Hz, and the frequency of Lift Pump No. 12 is 39 Hz; the average sludge concentration is 255 g / L; the flow rate of the first pump 6 is 15.5 m 3 / h; the flow rate of the second pump 7 is 80 m 3 / h; the flow rate of the third pump 8 is 25 m 3 / h; the clear water flow rate is 8 m 3 / h.

[0100] October 14th: The frequency of Lift Pump No. 1 is 33 Hz, the frequency of Lift Pump No. 2 is 33 Hz, the frequencies of Lift Pumps No. 3 - 10 are 29 Hz, the frequency of Lift Pump No. 11 is 33 Hz, and the frequency of Lift Pump No. 12 is 38.5 Hz; the average sludge concentration is 260 g / L; the flow rate of the first pump 6 is 15 m 3 / h; the flow rate of the second pump 7 is 80 m 3 / h; the flow rate of the third pump 8 is 24.5 m 3 / h; the clear water flow rate is 8 m 3 / h.

[0101] October 15th: The frequency of Lift Pump No. 1 is 33 Hz, the frequency of Lift Pump No. 2 is 33 Hz, the frequencies of Lift Pumps No. 3 - 10 are 29 Hz, the frequency of Lift Pump No. 11 is 33 Hz, and the frequency of Lift Pump No. 12 is 39 Hz; the average sludge concentration is 255 g / L; the flow rate of the first pump 6 is 15.5 m 3 / h; the flow rate of the second pump 7 is 80 m 3 / h; the flow rate of the third pump 8 is 25 m 3 / h; the clear water flow rate is 8 m 3 / h.

[0102] October 16th: The frequency of Lift Pump No. 1 is 33 Hz, the frequency of Lift Pump No. 2 is 33 Hz, the frequencies of Lift Pumps No. 3 - 10 are 29 Hz, the frequency of Lift Pump No. 11 is 33 Hz, and the frequency of Lift Pump No. 12 is 37 Hz; the average sludge concentration is 240 g / L; the flow rate of the first pump 6 is 15.5 m 3 / h; the flow rate of the second pump 7 is 80 m 3 / h; the flow rate of the third pump 8 is 25 m 3 / h; the clear water flow rate is 8.5 m 3 / h.

[0103] October 17th: The frequency of Lift Pump No. 1 is 33.5 Hz, the frequency of Lift Pump No. 2 is 33 Hz, the frequencies of Lift Pumps No. 3 - 10 are 29 Hz, the frequency of Lift Pump No. 11 is 33 Hz, and the frequency of Lift Pump No. 12 is 40 Hz; the average sludge concentration is 270 g / L; the flow rate of the first pump 6 is 16 m3 / h; The flow rate of the second pump 7 is 80 m 3 / h; The flow rate of the third pump 8 is 25 m 3 / h; The flow rate of the clear water is 8 m 3 / h.

[0104] On October 18: The frequency of the No. 1 lift pump is 34 Hz, the frequency of the No. 2 lift pump is 33 Hz, the frequencies of the 3rd to 10th lift pumps are 28 Hz, the frequency of the No. 11 lift pump is 31.5 Hz, and the frequency of the No. 12 lift pump is 38 Hz; The average sludge concentration is 275 g / L; The flow rate of the first pump 6 is 16 m 3 / h; The flow rate of the second pump 7 is 80 m 3 / h; The flow rate of the third pump 8 is 27 m 3 / h; The flow rate of the clear water is 7.8 m 3 / h.

[0105] On October 19: The frequency of the No. 1 lift pump is 34 Hz, the frequency of the No. 2 lift pump is 34 Hz, the frequencies of the 3rd to 10th lift pumps are 29 Hz, the frequency of the No. 11 lift pump is 33 Hz, and the frequency of the No. 12 lift pump is 38 Hz; The average sludge concentration is 270 g / L; The flow rate of the first pump 6 is 16 m 3 / h; The flow rate of the second pump 7 is 80 m 3 / h; The flow rate of the third pump 8 is 26.5 m 3 / h; The flow rate of the clear water is 8.2 m 3 / h.

[0106] On October 20: The frequency of the No. 1 lift pump is 33 Hz, the frequency of the No. 2 lift pump is 33 Hz, the frequencies of the 3rd to 10th lift pumps are 29 Hz, the frequency of the No. 11 lift pump is 33 Hz, and the frequency of the No. 12 lift pump is 39 Hz; The average sludge concentration is 250 g / L; The flow rate of the first pump 6 is 15.5 m 3 / h; The flow rate of the second pump 7 is 80 m 3 / h; The flow rate of the third pump 8 is 25 m 3 / h; The flow rate of the clear water is 8 m 3 / h.

[0107] On October 21: The frequency of the No. 1 lift pump is 34 Hz, the frequency of the No. 2 lift pump is 34 Hz, the frequencies of the 3rd to 10th lift pumps are 29 Hz, the frequency of the No. 11 lift pump is 33 Hz, and the frequency of the No. 12 lift pump is 38 Hz; The average sludge concentration is 270 g / L; The flow rate of the first pump 6 is 16 m 3 / h; The flow rate of the second pump 7 is 80 m 3 / h; The flow rate of the third pump 8 is 26.5 m 3 / h; The flow rate of the clear water is 8.1 m 3 / h.

[0108] October 22: The frequency of the No. 1 lift pump is 30 Hz, the frequency of the No. 2 lift pump is 30 Hz, the frequencies of the 3rd to 10th lift pumps are 27 Hz, the frequency of the No. 11 lift pump is 30 Hz, and the frequency of the No. 12 lift pump is 35 Hz; the average sludge concentration is 235 g / L; the flow rate of the first pump 6 is 14 m 3 / h; the flow rate of the second pump 7 is 80 m 3 / h; the flow rate of the third pump 8 is 23.5 m 3 / h; the clear water flow rate is 8.1 m 3 / h.

[0109] October 23: The frequency of the No. 1 lift pump is 32.5 Hz, the frequency of the No. 2 lift pump is 32 Hz, the frequencies of the 3rd to 10th lift pumps are 28.5 Hz, the frequency of the No. 11 lift pump is 32 Hz, and the frequency of the No. 12 lift pump is 36.5 Hz; the average sludge concentration is 240 g / L; the flow rate of the first pump 6 is 14 m 3 / h; the flow rate of the second pump 7 is 80 m 3 / h; the flow rate of the third pump 8 is 23.5 m 3 / h; the clear water flow rate is 8.1 m 3 / h.

[0110] October 24: The frequency of the No. 1 lift pump is 34 Hz, the frequency of the No. 2 lift pump is 34 Hz, the frequencies of the 3rd to 10th lift pumps are 29 Hz, the frequency of the No. 11 lift pump is 33 Hz, and the frequency of the No. 12 lift pump is 38 Hz; the average sludge concentration is 270 g / L; the flow rate of the first pump 6 is 16 m 3 / h; the flow rate of the second pump 7 is 80 m 3 / h; the flow rate of the third pump 8 is 26.5 m 3 / h; the clear water flow rate is 8.3 m 3 / h.

[0111] October 25: The frequency of the No. 1 lift pump is 31 Hz, the frequency of the No. 2 lift pump is 30 Hz, the frequencies of the 3rd to 10th lift pumps are 27 Hz, the frequency of the No. 11 lift pump is 30 Hz, and the frequency of the No. 12 lift pump is 35.5 Hz; the average sludge concentration is 225 g / L; the flow rate of the first pump 6 is 13.5 m 3 / h; the flow rate of the second pump 7 is 80 m 3 / h; the flow rate of the third pump 8 is 23 m 3 / h; the clear water flow rate is 8.3 m 3 / h.

[0112] October 26th: The frequency of Lift Pump No. 1 was 32.5 Hz, the frequency of Lift Pump No. 2 was 32 Hz, the frequencies of Lift Pumps No. 3 - 10 were 28.5 Hz, the frequency of Lift Pump No. 11 was 32 Hz, and the frequency of Lift Pump No. 12 was 36.5 Hz; the average sludge concentration was 240 g / L; the flow rate of the first pump 6 was 14 m 3 / h; the flow rate of the second pump 7 was 80 m 3 / h; the flow rate of the third pump 8 was 23.5 m 3 / h; the clear water flow rate was 8.1 m 3 / h.

[0113] October 27th: The frequency of Lift Pump No. 1 was 33 Hz, the frequency of Lift Pump No. 2 was 33 Hz, the frequencies of Lift Pumps No. 3 - 10 were 29 Hz, the frequency of Lift Pump No. 11 was 33 Hz, and the frequency of Lift Pump No. 12 was 39 Hz; the average sludge concentration was 255 g / L; the flow rate of the first pump 6 was 15.5 m 3 / h; the flow rate of the second pump 7 was 80 m 3 / h; the flow rate of the third pump 8 was 25 m 3 / h; the clear water flow rate was 8 m 3 / h.

[0114] October 28th: The frequency of Lift Pump No. 1 was 35 Hz, the frequency of Lift Pump No. 2 was 34 Hz, the frequencies of Lift Pumps No. 3 - 10 were 29 Hz, the frequency of Lift Pump No. 11 was 36 Hz, and the frequency of Lift Pump No. 12 was 41 Hz; the average sludge concentration was 280 g / L; the flow rate of the first pump 6 was 17 m 3 / h; the flow rate of the second pump 7 was 80 m 3 / h; the flow rate of the third pump 8 was 27.5 m 3 / h; the clear water flow rate was 8.1 m 3 / h.

[0115] October 29th: The frequency of Lift Pump No. 1 was 36.5 Hz, the frequency of Lift Pump No. 2 was 36 Hz, the frequencies of Lift Pumps No. 3 - 10 were 31 Hz, the frequency of Lift Pump No. 11 was 38 Hz, and the frequency of Lift Pump No. 12 was 42 Hz; the average sludge concentration was 285 g / L; the flow rate of the first pump 6 was 18 m 3 / h; the flow rate of the second pump 7 was 80 m 3 / h; the flow rate of the third pump 8 was 28 m 3 / h; the clear water flow rate was 8.3 m 3 / h.

[0116] Table 1 Actual Mud Washing and Separation Situation in October

[0117]

[0118] As can be seen from Examples 1 to 4, the method provided by the present invention has the following advantages: low operating power, requiring 50 kW; simple operation: only 1 dewatering machine (plate and frame filter press) is needed in the whole process flow; labor saving: almost no manual assistance is required for the sludge discharge of the last-stage plate and frame; small spare part replacement and easy maintenance: the filter cake of the last-stage plate and frame only needs to be replaced once a year; low working pressure: the maximum lift of the lifting equipment is less than 2 meters; water-cement ratio is less than 2, and the water-cement ratio is low. The method for slurry washing and separation provided by the present invention has low energy consumption, small maintenance and cleaning workload, low water-cement ratio and simple operation.

[0119] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A method for mud washing and separation, characterized in that, It includes the following steps: First, mix the raw materials with water to obtain a mixed slurry; the raw materials include one or more of slurry, ore powder, cement kiln bypass ash, fly ash generated by incineration, and fly ash generated by incineration; Perform N-stage countercurrent washing on the mixed slurry to obtain the N-stage concentrated slurry and the N-stage washing water; N≥3; during the N-stage countercurrent washing process, the washing water obtained from the first-stage countercurrent washing is used to recover soluble substances, the washing water obtained from the second-stage countercurrent washing is recycled for the first mixing, and the washing water obtained from the 3rd to Nth stage countercurrent washing is recycled for the previous stage of countercurrent washing; the N-stage countercurrent washing is carried out in a horizontal screw conveyor; Second, mix the N-stage concentrated slurry with water, and perform dehydration to obtain a clean slurry and a filtrate respectively, and the filtrate is recycled for the N-stage countercurrent washing.

2. The method according to claim 1, wherein The mass ratio of water to solids in the mixed slurry is 1.5 to 10:

1.

3. The method according to claim 1 or 2, characterized in that, The flow rate of the mixed slurry in the N-stage countercurrent washing process is 5 to 100 m 3 / h.

4. The washing and separation method according to claim 1, characterized in that, The flow rate of water in the second mixing process is 2 to 45 m 3 / h.

5. The method according to claim 1, characterized in that, N is any integer from 3 to 200.

6. The device used in the method according to any one of claims 1 to 5, in the direction of the slurry flow, successively includes a first stirring tank (1), N series-connected horizontal screw conveyors (2), a second stirring tank (3), and a dehydrator (4); a lifting device (5) is arranged between two adjacent horizontal screw conveyors; Among the N series-connected horizontal screw conveyors (2), each horizontal screw conveyor is provided with a slurry inlet, a slurry outlet, and a water outlet. The water outlet of the second horizontal screw conveyor (22) is communicated with the water inlet of the first stirring tank (1). The second to Nth horizontal screw conveyors are also provided with water inlets. The water outlets of the 3rd to Nth horizontal screw conveyors are communicated with the water inlets of the previous horizontal screw conveyor; A first pump (6) is arranged between the first stirring tank (1) and the first horizontal screw conveyor (21); A second pump (7) is arranged between the second stirring tank (3) and the dehydrator (4); The water outlet of the dehydrator (4) is communicated with the water inlet of the Nth horizontal screw conveyor (24) through a third pump (8).

7. The device according to claim 6, characterized in that, The lifting device includes a low-lift water pump or a hoist; the lift of a single low-lift water pump is 1 to 5 meters.

8. The device according to claim 6, characterized in that, The frequencies of the first pump (6), the second pump (7), the third pump (8), and a single lifting device are independently 15 to 50 Hz.

9. The device according to claim 6, characterized in that The power of a single horizontal screw conveyor is 0.75 to 4 kW, and the frequency is 5 to 50 Hz.

10. The device according to any one of claims 6 to 9, characterized in that, The total power of the horizontal screw conveyor and the lifting device is 30 to 120 kW.

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