Coal slime dehydration system for premixing xanthate

Abstract

The utility model discloses a coal slime dehydration system for premixing xanthate, and belongs to the technical field of coal slime water treatment. The utility model aims to provide a coal slime dehydration system which can intelligently add xanthate and comprises a premixing device. According to the technical scheme, a bottom outlet of a thickener is connected with an inlet of a concentration underflow pump, a xanthate outlet in the bottom of a xanthate dispensing barrel is connected with an inlet of a xanthate feeding pump, and outlets of the concentration underflow pump and the xanthate feeding pump are both connected with an inlet of an unpowered stirring device; an outlet of the unpowered stirring device is connected with a feed port of the filter press feed stirring barrel, and a discharge port of the filter press feed stirring barrel is connected with the filter press; the concentration underflow pump and the xanthate dosing pump are both connected with the PLC; the unpowered stirring device comprises an outer pipe, a spiral blade and connecting flanges, the spiral blade is fixed on the inner wall of the outer pipe, and the connecting flanges connected with the pipeline are arranged at the two ends of the outer pipe. The device is used in the xanthate filtration-aided coal slime dehydration process.

Description

Technical Field

[0001] This utility model relates to a premixed xanthate coal slime dewatering system, belonging to the field of coal slime water treatment technology. Background Technology

[0002] In coal slime dewatering systems of thermal coal preparation plants, xanthate, specifically polyaluminum chloride (PAC), is frequently used to aid in the dewatering of coal slime. However, the preparation and addition of xanthate are often poorly controlled. Dry xanthate powder is typically added directly to the feed mixing tank of the filter press, usually intermittently at the edge while the coal slime slurry is continuously fed into the tank from the bottom. This often results in insufficient contact and reaction between the xanthate and the coal slime, hindering proper mixing and dewatering. This leads to wasted reagents, prolonged dewatering time, poor dewatering efficiency, and low filter press operating efficiency, directly impacting the treatment capacity of the coal slime slurry system and limiting the overall processing capacity of the washing and beneficiation system. The treatment effect is particularly poor when dealing with high-ash, fine-sludge coal slime slurry, often requiring increased xanthate dosage, further highlighting the significant waste of reagents. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a coal slime dewatering system that can intelligently add xanthate and premix the xanthate and coal slime before they enter the mixing tank of the filter press.

[0004] To achieve the above objectives, this utility model adopts the following technical solution: a premixed xanthate coal slime dewatering system, comprising a thickener, a thickening underflow pump, a xanthate mixing tank, a xanthate dosing pump, a non-powered stirring device, a filter press feed mixing tank, and a PLC controller. The bottom outlet of the thickener is connected to the inlet of the thickening underflow pump, the outlet at the bottom of the xanthate mixing tank is connected to the inlet of the xanthate dosing pump, the outlets of both the thickening underflow pump and the xanthate dosing pump are connected to the inlet of the non-powered stirring device, the outlet of the non-powered stirring device is connected to the inlet of the filter press feed mixing tank, and the outlet of the filter press feed mixing tank is connected to the filter press.

[0005] The concentration underflow pump and the xanthate dosing pump are both connected to the PLC controller via signal lines or wireless signals.

[0006] The non-powered stirring device includes an outer pipe, a spiral blade, and a connecting flange. The length and outer diameter of the spiral blade are adapted to the length and inner diameter of the outer pipe, respectively. The spiral blade is fixed on the inner wall of the outer pipe, and both ends of the outer pipe are provided with connecting flanges for connecting to the pipeline.

[0007] Furthermore, a first flow meter and a concentration meter are installed on the pipeline between the concentrator and the concentrator underflow pump, and a second flow meter is installed on the pipeline between the xanthate dosing pump and the non-powered stirring device;

[0008] The first flow meter, the concentration meter, and the second flow meter are all connected to the PLC controller via signal lines or wireless signals.

[0009] Furthermore, a water tank for replenishing water and a screw conveyor for replenishing medicine are provided above the xanthium powder preparation tank. An electrically controlled valve is installed at the outlet of the water tank, and the screw conveyor is connected to the xanthium powder storage tank.

[0010] The electrically controlled valves and screw conveyors are all connected to the PLC controller via signal lines or wireless signals.

[0011] Furthermore, the preparation container for the yellow medicine is equipped with a stirring device.

[0012] Furthermore, a level gauge is installed on the top of the xanthate preparation tank, and a conductivity meter is installed on the side wall;

[0013] The level gauge and conductivity meter are both connected to the PLC controller via signal lines or wireless signals.

[0014] Furthermore, a one-way valve is installed on the pipeline between the xanthate dosing pump and the non-powered stirring device.

[0015] Compared with the prior art, the present invention has the following beneficial effects.

[0016] 1. In this utility model, the non-powered stirring device fully premixes the coal slime pumped from the concentrated underflow pump and the xanthate solution pumped from the xanthate dosing pump, which significantly improves the xanthate addition effect, significantly enhances the coal slime water filtration and dewatering effect, and saves the amount of xanthate used.

[0017] 2. This utility model also includes a PLC controller, which receives feedback from the first flow meter and the second flow meter, and precisely controls the amount of xanthate added by controlling the concentration underflow pump and the xanthate dosing pump, thereby realizing the precise, efficient and automatic addition of xanthate.

[0018] 3. In this utility model, the water tank and screw conveyor installed above the xanthate preparation tank realize the automatic preparation and replenishment of xanthate solution. The conductivity meter on the side wall of the xanthate preparation tank can detect the xanthate concentration in real time, making the automatic preparation and replenishment of xanthate solution more accurate. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is a schematic diagram of the structure of the non-powered stirring device in this utility model.

[0022] Figure 3 This is a schematic diagram showing the connection between the PLC controller and various components in this utility model.

[0023] In the diagram: 1 is a concentrator, 2 is a concentrator underflow pump, 3 is a xanthate mixing tank, 4 is a xanthate dosing pump, 5 is a non-powered stirring device, 51 is an outer pipe, 52 is a spiral blade, 53 is a connecting flange, 6 is a filter press feed mixing tank, 7 is a PLC controller, 8 is a first flow meter, 9 is a concentration meter, 10 is a second flow meter, 11 is a water tank, 12 is a screw conveyor, 13 is an electrically controlled valve, 14 is a xanthate dry powder storage tank, 15 is a level gauge, and 16 is a conductivity meter. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described in conjunction with the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0025] It should be noted that the structures, proportions, sizes, etc. shown in the accompanying drawings of this specification are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which this utility model can be implemented. Therefore, they have no substantial technical significance. Any modification to the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed in this utility model, provided that it does not affect the effects and purposes that this utility model can produce. It should be noted that in this specification, relational terms such as "first" and "second" are only used to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0026] The present invention provides the following embodiments.

[0027] like Figure 1As shown, this utility model discloses a coal slime dewatering system using premixed xanthate, comprising a thickener 1, a thickening underflow pump 2, a xanthate mixing tank 3, a xanthate dosing pump 4, a non-powered stirring device 5, a filter press feed mixing tank 6, and a PLC controller 7. The bottom outlet of the thickener 1 is connected to the inlet of the thickening underflow pump 2, the bottom outlet of the xanthate mixing tank 3 is connected to the inlet of the xanthate dosing pump 4, the outlets of both the thickening underflow pump 2 and the xanthate dosing pump 4 are connected to the inlet of the non-powered stirring device 5, the outlet of the non-powered stirring device 5 is connected to the inlet of the filter press feed mixing tank 6, and the outlet of the filter press feed mixing tank 6 is connected to the filter press.

[0028] like Figure 3 As shown, the concentration underflow pump 2 and the xanthate dosing pump 4 are both connected to the PLC controller 7 via signal lines or wireless signals;

[0029] like Figure 2 As shown, the non-powered stirring device 5 includes an outer pipe 51, a spiral blade 52 and a connecting flange 53. The length and outer diameter of the spiral blade 52 are adapted to the length and inner diameter of the outer pipe 51, respectively. The spiral blade 52 is fixed on the inner wall of the outer pipe 51. Both ends of the outer pipe 51 are provided with connecting flanges 53 for connecting to the pipeline.

[0030] The concentration underflow pump 2 and xanthate dosing pump 4 respectively send the coal slurry and xanthate solution into the non-powered stirring device 5. The non-powered stirring device 5 is equipped with a spiral blade 52, which transforms the straight channel inside the non-powered stirring device 5 into a spiral channel. The coal slurry water and xanthate solution continuously flow and impact the spiral blade 52, performing splitting, impacting, rotating, and merging motions, thereby achieving pre-mixing of the coal slurry water and xanthate solution. The mixture flowing out of the non-powered stirring device 5 is a pre-mixed coal slurry water and xanthate mixture. After being stirred in the feed mixing tank 6 of the filter press, the coal slurry water and xanthate solution are thoroughly mixed together, enhancing the effect of xanthate-assisted coal slurry dewatering.

[0031] A first flow meter 8 and a concentration meter 9 are installed on the pipeline between the concentrator 1 and the underflow pump 2, and a second flow meter 10 is installed on the pipeline between the xanthate dosing pump 4 and the non-powered stirring device 5.

[0032] like Figure 3 As shown, the first flow meter 8, the concentration meter 9, and the second flow meter 10 are all connected to the PLC controller 7 via signal lines or wireless signals.

[0033] The first flow meter 8 and the concentration meter 9 detect the flow rate and concentration of the concentrated underflow and are used to calculate the amount of coal slime. The second flow meter 10 detects the flow rate of the xanthate solution and is used to calculate the amount of xanthate.

[0034] Above the xanthium powder preparation tank 3, there is a water tank 11 for replenishing water and a screw conveyor 12 for replenishing medicine. An electrically controlled valve 13 is installed at the outlet of the water tank 11, and the screw conveyor 12 is connected to the xanthium powder storage tank 14.

[0035] like Figure 3 As shown, both the electrically controlled valve 13 and the screw conveyor 12 are connected to the PLC controller 7 via signal lines or wireless signals. The electrically controlled valve 13 is connected to a 220V power supply and can be connected to the PLC controller 7 via a switch signal line.

[0036] The yellow medicine mixing tank 3 is equipped with a stirring device.

[0037] The top of the xanthate preparation tank 3 is equipped with a level gauge 15, and the side wall is equipped with a conductivity meter 16.

[0038] like Figure 3 As shown, the level gauge 15 and conductivity meter 16 are both connected to the PLC controller 7 via signal lines or wireless signals.

[0039] The above structure enables the automatic preparation of xanthate solution. The conductivity value monitored in real time by the conductivity meter 16 can reflect the xanthate content. By controlling the electronically controlled valve 13 and the screw conveyor 12, the ratio of added water and xanthate powder can be adjusted to keep the conductivity value within a predetermined range, thus preparing a xanthate solution of the required concentration.

[0040] A check valve is installed on the pipeline between the xanthate dosing pump 4 and the non-powered stirring device 5. To prevent coal slurry from flowing back into the xanthate mixing tank, the following setup is required: when starting up, the xanthate dosing pump 4 starts first, followed by the concentrate underflow pump 2; when shutting down, the concentrate underflow pump 2 stops first, followed by the xanthate dosing pump 4. The check valve ensures stable xanthate addition.

[0041] The working process of this utility model is as follows:

[0042] First, through multiple production experiments, the optimal ratio of dry coal slime to reagent dosage, the optimal xanthate solution concentration corresponding to different coal slime water bottom flow concentrations, and the correspondence between xanthate solution concentration and conductivity value were determined. The amount of dry coal slime entering the system was calculated using the first flow meter 8 and concentration meter 9 installed on the concentrated coal slime water pipeline. Then, the required concentration of xanthate solution was prepared in the xanthate preparation tank 3: first, the electrically controlled valve 13 under the water tank 11 was opened to add clean water; then, the screw conveyor 12 was started to add dry xanthate powder. The required concentration of xanthate solution was prepared based on the conductivity value monitored in real time by the conductivity meter 16. Preparation was stopped when the liquid level reached the maximum value set by the level gauge (when the liquid level in the preparation tank fell below the set value, the electrically controlled valve 13 and the screw conveyor 12 were restarted to begin the next round of xanthate solution preparation). The prepared xanthate solution is fed into a non-powered mixing device 5, where the xanthate flow rate is monitored by the second flow meter 10 and adjusted in real time by the xanthate dosing pump 4 with a frequency converter. This allows the xanthate solution and the coal slurry water from the concentration underflow pump 2 to undergo splitting, impacting, rotating, and merging motions as they flow through the non-powered mixing device 52. This improves the radial mixing effect of the xanthate and coal slurry water, forming a pre-mixed mixture of coal slurry water and xanthate, achieving efficient pre-mixing of the xanthate and coal slurry water. After pre-mixing, the mixture enters the feed mixing tank 6 of the filter press, where it is thoroughly mixed before finally entering the filter press. This process not only improves the xanthate-assisted dewatering effect on the coal slurry but also achieves precise xanthate addition, saving on xanthate usage.

[0043] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A coal slurry dewatering system of premix xanthate characterized in that: The device comprises a thickener (1), a thickening underflow pump (2), a xanthate dosing barrel (3), a xanthate dosing pump (4), a non-powered stirring device (5), a filter press feeding stirring barrel (6) and a PLC controller (7), the bottom outlet of the thickener (1) is connected with the inlet of the thickening underflow pump (2), the outlet of the xanthate dosing pump (4) is connected with the inlet of the non-powered stirring device (5), the outlet of the non-powered stirring device (5) is connected with the feeding inlet of the filter press feeding stirring barrel (6), and the outlet of the filter press feeding stirring barrel (6) is connected with a filter press. The thickening underflow pump (2) and the xanthate dosing pump (4) are connected with the PLC controller (7) through signal lines or wireless signals. The non-powered stirring device (5) comprises an outer pipe (51), a spiral blade (52) and a connecting flange (53), the length and outer diameter of the spiral blade (52) are adapted to the length and inner diameter of the outer pipe (51), the spiral blade (52) is fixed on the inner wall of the outer pipe (51), and the two ends of the outer pipe (51) are provided with the connecting flanges (53) connected with pipelines.

2. The pre-mixed xanthate coal slurry dewatering system according to claim 1, characterized in that: A first flowmeter (8) and a concentration meter (9) are installed on the pipeline between the thickener (1) and the thickening underflow pump (2), and a second flowmeter (10) is installed on the pipeline between the xanthate dosing pump (4) and the non-powered stirring device (5). The first flowmeter (8), the concentration meter (9) and the second flowmeter (10) are connected with the PLC controller (7) through signal lines or wireless signals.

3. The pre-mixed xanthate coal slime dewatering system according to claim 1 or 2, characterized in that: A water tank (11) for water supplement and a spiral conveyor (12) for medicine supplement are arranged above the xanthate dosing barrel (3), an electric control valve (13) is installed at the water outlet of the water tank (11), and the spiral conveyor (12) is connected with a xanthate dry powder storage tank (14). The electric control valve (13) and the spiral conveyor (12) are connected with the PLC controller (7) through signal lines or wireless signals.

4. The pre-mixed xanthate coal slurry dewatering system according to claim 3, characterized in that: A stirring device is arranged in the xanthate dosing barrel (3).

5. The pre-mixed xanthate coal slurry dewatering system according to claim 1 or 2, characterized in that: A liquid level meter (15) is installed on the top of the xanthate dosing barrel (3), and an electric conductivity meter (16) is installed on the side wall. The liquid level meter (15) and the electric conductivity meter (16) are connected with the PLC controller (7) through signal lines or wireless signals.

6. The pre-mixed xanthate coal slurry dewatering system according to claim 1 or 2, characterized in that: A one-way valve is installed on the pipeline between the xanthate dosing pump (4) and the non-powered stirring device (5).

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