Chromium recovery device

Abstract

The utility model provides a chromium recovery device, belongs to the technical field of chromium recovery, and solves the problem of poor chromium recovery effect in the prior art. The device comprises a tank body, the top of the tank body is provided with a leachate inlet pipe, a liquid inlet pipe and a breather pipe, electromagnetic valves are arranged in the leachate inlet pipe, the liquid inlet pipe and the breather pipe, the upper end of the tank body is connected with a suction pipe, the bottom of the tank body is provided with a discharge pipe and a drain pipe, and the discharge pipe and the drain pipe are provided with control valves; the control valve comprises a barrel communicated with the bottom of the tank body, a piston head is arranged in the barrel in a sliding and sealing mode, the lower end of the piston head is connected with a telescopic device, the discharging pipe and the drainage pipe are communicated to the barrel, and the discharging pipe is lower than the drainage pipe. During reaction, the piston head is jacked to the uppermost end of the cylinder body by the telescopic device, and the upper end face of the piston head is flush with the bottom of the tank body, so that all solutions are fully mixed, the solutions are prevented from being gathered in the water drainage pipe and the discharge pipe, and the chromium recovery effect is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of chromium recovery, in particular to a device for recovering chromium. Background Art

[0002] Chromium recovery is an important resource recycling activity, which is of great significance for conserving resources and reducing environmental pollution. Chromium recovery is commonly done by oxidizing chromium to hexavalent chromium compounds, and then reducing or precipitating them to obtain insoluble chromium compounds.

[0003] During the reaction process, existing chromium recovery equipment uses a stirring device to stir and mix the liquid (hexavalent chromium compound and reducing agent) in the tank to ensure the reaction proceeds fully. However, the discharge pipe for discharging sediment and the drain pipe for discharging wastewater at the bottom of the tank will accumulate some solution, resulting in the partial solution not reacting completely and finally being discharged from the pipe, affecting the chromium recovery effect. Utility Model Content

[0004] In response to the above problems, the purpose of the present utility model is to provide a device for recovering chromium. During the reaction, the piston head is pushed to the uppermost end of the cylinder by the telescopic device. At this time, the upper end surface of the piston head is flush with the bottom of the tank body, so that all the solutions are fully mixed, avoiding the solution from gathering in the drain pipe and the discharge pipe, thereby ensuring the chromium recovery effect.

[0005] The technical solutions adopted in this utility model are as follows:

[0006] A device for recovering chromium comprises a tank body, wherein a leachate inlet pipe, a liquid inlet pipe and a vent pipe are provided on the top of the tank body, and electromagnetic valves are provided in the leachate inlet pipe, the liquid inlet pipe and the vent pipe. The upper end of the tank body is connected to a suction pipe, which is connected to a vacuum pump. A stirring device is provided in the tank body, and a discharge pipe and a drain pipe are provided at the bottom of the tank body. The discharge pipe and the drain pipe are provided with control valves, and a filter screen is provided in the drain pipe. The control valve comprises a cylinder body connected to the bottom of the tank body, a piston head is provided in the cylinder body for sliding sealing, and a telescopic device is connected to the lower end of the piston head. The discharge pipe and the drain pipe are connected to the cylinder body, and the height of the discharge pipe is lower than that of the drain pipe.

[0007] Preferably, the filter screen is detachably connected to the end face of the drain pipe by screws.

[0008] Preferably, the stirring device includes a motor arranged on the top of the tank body, the motor is connected to a stirring shaft that is rotatably sealed and passes through the top of the tank body, and a plurality of stirring blades are provided on the stirring shaft.

[0009] Preferably, the lower end of the stirring shaft is connected to a U-shaped scraper that fits the bottom of the tank.

[0010] Preferably, a conductivity probe and a chromium ion probe are provided on the inner wall of the tank, and the conductivity probe and the chromium ion probe are connected to a display.

[0011] Preferably, the inner wall of the tank is provided with a temperature probe connected to the display, and the suction pipe is provided with a regulating valve.

[0012] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0013] During the reaction, the piston head is pushed to the top of the cylinder by the telescopic device. At this time, the upper end surface of the piston head is flush with the bottom of the tank, so that all the solutions are fully mixed, avoiding the solution from gathering in the drain pipe and discharge pipe, and ensuring the chromium recovery effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 This is a schematic cross-sectional view of an embodiment of the present invention.

[0016] Figure numerals: 1-tank body; 2-leachate inlet pipe; 3-motor; 4-liquid inlet pipe; 5-vent pipe; 6-regulating valve; 7-vacuum pump; 8-suction pipe; 9-display; 10-stirring shaft; 11-stirring blade; 12-conductivity probe; 13-chromium ion probe; 14-temperature probe; 15-U-shaped scraper; 16-piston head; 17-discharge pipe; 18-cylinder body; 19-telescopic device; 20-drain pipe; 21-filter plate. DETAILED DESCRIPTION

[0017] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0019] In the description of the present invention, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the application is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0020] The following combination Figure 1 The utility model is described in detail.

[0021] Example

[0022] A device for recovering chromium comprises a tank body 1. The top of the tank body 1 is provided with a leachate inlet pipe 2, several liquid inlet pipes 4 and a vent pipe 5. Solenoid valves are provided in the leachate inlet pipe 2, the liquid inlet pipe 4 and the vent pipe 5. The upper end of the tank body 1 is connected to a suction pipe 8, which is connected to a vacuum pump 7. A stirring device is provided in the tank body 1. A discharge pipe 17 and a drain pipe 20 are provided at the bottom of the tank body 1. The discharge pipe 17 and the drain pipe 20 are provided with control valves. A filter screen plate 21 is provided in the drain pipe 20. The control valve comprises a cylinder body 18 connected to the bottom of the tank body 1. A piston head 16 is provided in the cylinder body 18 for sliding sealing. The lower end of the piston head 16 is connected to a telescopic device 19. The discharge pipe 17 and the drain pipe 20 are connected to the cylinder body 18, and the height of the discharge pipe 17 is lower than that of the drain pipe 20.

[0023] During the precipitation reaction, the piston head 16 is pushed to the uppermost end of the cylinder 18 by the telescopic device 19. At this time, the upper end surface of the piston head 16 is flush with the bottom of the tank body 1, ensuring sufficient mixing of the solution. When it is necessary to discharge the wastewater, the piston head 16 is controlled to move downward to expose the drain pipe 20. Under the filtering effect of the filter plate 21, the precipitate and the wastewater are separated. The piston head 16 is then moved downward to expose the discharge pipe 17, thereby discharging the precipitate. The telescopic device 19 is a hydraulic telescopic rod, an electric telescopic rod, or a screw lifting device.

[0024] The filter screen plate 21 is detachably connected to the end surface of the drain pipe 20 by screws, so that the filter screen plate 21 can be easily disassembled and assembled.

[0025] The stirring device includes a motor 3 provided on the top of the tank body 1, and the motor 3 is connected to a stirring shaft 10 that rotates and seals and passes through the top of the tank body 1. The stirring shaft 10 is provided with a plurality of stirring blades 11. The motor 3 drives the stirring shaft 10 to rotate and drives the stirring blades 11 to stir and mix the solution.

[0026] The lower end of the stirring shaft 10 is connected to a U-shaped scraper 15 that fits the bottom of the tank body 1. The U-shaped scraper 15 is provided to scrape off the sediment at the bottom of the tank body 1 to prevent the sediment from being easily discharged from the tank body 1 and to prevent the attached sediment from being difficult to clean during subsequent cleaning.

[0027] The inner wall of the tank 1 is provided with a conductivity probe 12 and a chromium ion probe 13, which are connected to a display 9. The conductivity probe 12 is provided to monitor the conductivity of the liquid during the cleaning process, and the chromium ion probe 13 is provided to monitor the chromium ion concentration during the precipitation reaction. The conductivity and chromium ion concentration values ​​are displayed on the display 9. The conductivity probe 12 is conventional, such as the DDG-0.1-14 conductivity probe; the chromium ion probe 13 is conventional, such as the probe in the SC-Ge-1A chromium ion detector.

[0028] The inner wall of the tank 1 is provided with a temperature probe 14 connected to the display 9, and a regulating valve 6 is provided in the suction pipe 8. The temperature probe 14 can monitor the temperature of the solution. In order to ensure the rapid progress of the reaction, the reaction temperature needs to be controlled within a constant range, so it is necessary to control the feed rate. Therefore, the suction force of the vacuum pump 7 can be controlled by the regulating valve 6, thereby controlling the flow rate of the liquid inlet pipe 4.

[0029] Steps:

[0030] The leachate inlet pipe 2 is used to transport the hexavalent chromium leachate. Several liquid inlet pipes 4 can be connected to containers for purified water, reducing agents, and other related liquids as needed. First, the leachate is extracted. The solenoid valve of the leachate inlet pipe 2 is opened, and the solenoid valves of the liquid inlet pipe 4 and the vent pipe 5 are closed. The vacuum pump 7 operates to pump the leachate into the tank 1. The solenoid valve of the leachate inlet pipe 2 is then closed, and the solenoid valve of the liquid inlet pipe 4 is opened to transport the relevant liquids. Simultaneously, the stirring device is activated to allow the leachate and reducing agent to mix and react.

[0031] During the precipitation reaction, the chromium ion probe 13 monitors the chromium ion concentration. When it meets the requirements, the solenoid valve of the vent pipe 5 and the drain pipe 20 are opened to separate the precipitate and wastewater. After the filtration is completed, the piston head 16 is moved up again, and purified water is drawn from the liquid inlet pipe 4 to wash the precipitate, and then the wastewater is discharged through the drain pipe 20. This process is repeated until the conductivity is qualified. Finally, the discharge pipe 17 is opened to discharge the precipitate, completing the chromium recovery operation.

[0032] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A device for recovering chromium, comprising a tank (1), characterized in that: The top of the tank body (1) is provided with an extract inlet pipe (2), several liquid inlet pipes (4) and a vent pipe (5), and the extract inlet pipe (2), the liquid inlet pipe (4) and the vent pipe (5) are all provided with electromagnetic valves. The upper end of the tank body (1) is connected to a suction pipe (8), and the suction pipe (8) is connected to a vacuum pump (7). A stirring device is provided in the tank body (1), and a discharge pipe (17) and a drain pipe (20) are provided at the bottom of the tank body (1). The discharge pipe (17) and the drain pipe (20) are connected to the upper end of the tank body (1). The water pipe (20) is provided with a control valve, and a filter screen (21) is provided in the drain pipe (20); the control valve comprises a cylinder (18) connected to the bottom of the tank body (1), a piston head (16) is provided in the cylinder (18) in a sliding seal, and the lower end of the piston head (16) is connected to a telescopic device (19), a discharge pipe (17) and a drain pipe (20) are connected to the cylinder (18), and the height of the discharge pipe (17) is lower than the height of the drain pipe (20).

2. The device for recovering chromium according to claim 1, characterized in that: The filter screen plate (21) is detachably connected to the end surface of the drain pipe (20) via screws.

3. The device for recovering chromium according to claim 1, characterized in that: The stirring device comprises a motor (3) arranged on the top of the tank body (1), the motor (3) being connected to a stirring shaft (10) which is rotatably sealed and passes through the top of the tank body (1), and a plurality of stirring blades (11) being arranged on the stirring shaft (10).

4. The device for recovering chromium according to claim 3, characterized in that: The lower end of the stirring shaft (10) is connected to a U-shaped scraper (15) that fits the bottom of the tank body (1).

5. The device for recovering chromium according to claim 1, characterized in that: The inner wall of the tank (1) is provided with a conductivity probe (12) and a chromium ion probe (13), and the conductivity probe (12) and the chromium ion probe (13) are connected to a display (9).

6. The device for recovering chromium according to claim 5, characterized in that: The inner wall of the tank body (1) is provided with a temperature probe (14) connected to a display (9), and a regulating valve (6) is provided in the suction pipe (8).

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