CN201873760U - Device for recovering metallic nickel ion in electroplating wastewater - Google Patents

Abstract

The utility model discloses a device for recovering metallic nickel ion in electroplating wastewater, which comprises a fluidized bed and a wastewater storage tank. The fluidized bed is provided with a water inlet and a water outlet, which are both communicated with the wastewater storage tank, and the fluidized bed is filled with fluidized particles and provided with a cathode plate and an anode plate symmetrically. Further, the water inlet of the fluidized bed is communicated with the wastewater storage tank via a pipeline, a circulating pump is arranged on the pipeline, a liquid distribution plate is arranged on the bottom of the fluidized bed, and the fluidized particles are positioned on the liquid distribution plate. The device for recovering metallic nickel in electroplating wastewater is simple in operation without secondary environmental pollution, purity of recovered metallic nickel reaches 99%, and metal recovery rate is higher up to 99%, while emission of wastewater is reduced by 90%. A small quantity of wastewater is subjected to standard emission after being treated by a membrane filter or activated carbon, and accordingly can be applied to the industry directly.

Description

A device for recovering metal nickel ions in electroplating wastewater

technical field

The utility model relates to a device for recovering nickel ions in waste water, in particular to a device for recovering metal nickel ions in electroplating waste water.

Background technique

At present, there have been a lot of research on the treatment and recovery of nickel in nickel electroplating rinsing water, but there is no proper, reasonable, flexible and convenient method for industrial application in China. According to reports, in 2004, there were about 10,000 electroplating The annual discharge of wastewater is about 4 billion M ³ tons, and about 50% of the wastewater does not meet the standard. Most of the nickel-containing wastewater is diluted with water and discharged. This is not only a serious waste of resources, but also seriously pollutes the environment.

To recover nickel resources, what method to use to recover nickel in electroplating wastewater is the first issue to be considered. One is to recover nickel by fluidized bed electrode electrolysis, and the resulting product is granular metal nickel, and there is a problem of particle growth and redissolution; there is also the recovery of nickel by air flotation, but metal nickel cannot be obtained directly, and most scholars also use it. The recovery of nickel by chemical method and ion exchange method has problems such as troublesome treatment of regeneration solution, complicated operation and management, and the inability to directly obtain metallic nickel. Therefore, there is an urgent need for a device for recovering metallic nickel ions that is convenient in operation and management, and can recover nickel with high purity. and methods.

Utility model content

The purpose of the utility model is to provide a device for recovering metal nickel ions from electroplating wastewater, which has the characteristics of simple operation and management, high recovery rate, high recovery purity and low wastewater discharge rate.

The purpose of this utility model is to realize through the following technical solutions:

A device for recovering metal nickel ions in electroplating wastewater, which includes a fluidized bed and a waste water storage tank, the fluidized bed is provided with a water inlet and a water outlet that are all connected to the waste water storage tank, and the fluidized bed Fluidized particles are contained inside, and a cathode plate and an anode plate are arranged symmetrically; and a liquid distribution plate is arranged at the bottom of the fluidized bed, and the fluidized particles are located on the liquid distribution plate.

The water inlet of the fluidized bed communicates with the waste water storage tank through a pipeline, and a circulating pump is arranged on the pipeline.

There are multiple pairs of cathode and anode plates placed in parallel in the fluidized bed, the cathode plates and the anode plates are equidistantly spaced, and the distance between adjacent anode plates and cathode plates is 50-150mm.

The water inlet of the circulation pump is provided with an acid-resistant and alkali-resistant filter, which is placed in a waste water storage tank.

The anode plate is a lead plate with a thickness of 3-10mm, and the cathode plate is a titanium-plated metal plate with a thickness of 4-6mm.

The beneficial effects of the utility model are that the device for recovering electroplating wastewater metal nickel ions is simple to operate; there is no secondary pollution to the environment; the recovered metal nickel has a purity of up to 99%, and the metal recovery rate is high, which can reach 99%; The emission is reduced by 90%. A small amount of waste water can be discharged up to the standard after being treated with membrane filtration, or treated with activated carbon, and can be directly applied to industry.

Description of drawings

The utility model will be described in further detail below according to the accompanying drawings and embodiments.

Fig. 1 is the structure diagram of the utility model recovery electroplating wastewater metal nickel ion device.

In the picture:

1. Fluidized bed; 2. Wastewater storage tank; 3. Inlet pipe of circulating pump; 4. Inlet pipe of fluidized bed; 5. Liquid distribution plate; 6. Fluidized particles; 7. Anode plate; 8. Cathode plate; 9 1. Anode connection; 10. Cathode connection; 11. Fluidized bed outlet pipe; 12. Filter; 13. Circulation pump.

Detailed ways

Please refer to shown in Fig. 1, Fig. 1 is the structural representation of the device of the utility model reclaiming electroplating waste water metal nickel ion, a kind of device of reclaiming metal nickel ion in electroplating waste water, it comprises fluidized bed 1 and waste water storage tank 2, so The bottom of the fluidized bed 1 is provided with a water inlet connected to the fluidized bed water inlet pipe 4, and the fluidized bed water inlet pipe 4 is provided with a circulating pump 13, and the circulating pump 13 is connected to the waste water storage tank through the circulating pump water inlet pipe 3. 2 connected, the fluidized bed 1 is filled with fluidized particles 6, and the cathode plate 8 connected to the cathode connection 10 and the anode plate 7 connected to the anode connection 9 are arranged symmetrically; the cathode plate 8 and the anode plate 7 are parallel and symmetrical set, and the cathode plate 8 and the anode plate 7 are equidistantly spaced, the distance between the adjacent anode plate 7 and the cathode plate 8 is 50-150mm, and the anode plate 7 is lead with a thickness of 3-10mm plate, the cathode plate 8 is a titanium-plated metal plate with a thickness of 4-6mm, and the bottom of the fluidized bed 1 is provided with a liquid distribution plate 5, and the fluidized particles 6 are located on the liquid distribution plate 5, and the fluidized The top of the bed 1 is provided with a water outlet connected to the fluidized bed outlet pipe 11, the fluidized bed outlet pipe 11 is arranged above the waste water storage tank 2, and the circulating pump inlet pipe 3 is provided with an acid-resistant and alkali-resistant filter device 12, and the filter 12 is placed at the bottom of the waste water storage tank 2.

Concrete operation embodiment 1:

1. Place the electrolytic cell equipment of the fluidized bed 1 next to the electroplating wastewater storage tank 2, the concentration of nickel ions in the wastewater is 0.05g/L, the pH value of the solution is controlled to 7, and the electrolytic cell is equipped with 1.2-2mm cleaning Sand particles, the distance between the plates is 50mm;

2. Put the suction end of the circulating pump inlet pipe 3 with the filter 12 into the electroplating wastewater storage tank 2, and the circulating pump 13 pumps the treated wastewater into the circulating fluidized bed 1 through the fluidized bed inlet pipe 4 to control the liquid The flow rate is 1.5cm/s, so that the sand particles are in a state of fluidized motion, and the particles do not overflow the bed;

3. Start the power supply, control the current density to 20A/m ² , and carry out metal nickel recovery. After the thickness of nickel deposited on the cathode plate 8 reaches 2-3 mm, the cathode plate 8 is peeled off, and the cleaned cathode plate 8 is put back to the original place, and the process is continued. Operations to recover metallic nickel;

4. Recycled electroplating wastewater is returned to the preparation of electroplating solution after membrane treatment; after 10 operations, it can be treated by membrane to meet the discharge standard.

The recovery rate of nickel is 99%, the purity of nickel is 99%, and the current efficiency is 28.1%.

Concrete operation embodiment 2:

1. The concentration of nickel ions in the waste water is 1g/L, the pH value of the control solution is 5, the fluidized particles of 2-3mm are installed in the electrolytic cell, and the distance between the adjacent anode plate 7 and the cathode plate 8 is 60mm;

2. Put the suction end with filter 12 of the circulating pump inlet pipe 3 into the electroplating wastewater storage tank 2, and the treated wastewater is pumped into the circulating fluidized bed 1 through the fluidized bed inlet pipe 3 by the circulating pump 13 to control the flow of the liquid The flow rate is 5cm/s, so that the fluidized particles are in a state of fluidized motion and the particles do not overflow the bed;

3. Start the power supply, control the current density to 40A/m ² , and carry out metal nickel recovery. After the nickel thickness deposited on the cathode plate 8 reaches 2-3mm, the cathode plate 8 is peeled off, and the cleaned cathode plate 8 is put back to the original place, and the process is continued. Operations to recover metallic nickel;

4. The recovered electroplating wastewater is returned to the preparation of electroplating solution after membrane treatment; after 10 operations, it is treated by membrane and discharged after reaching the discharge standard.

The recovery rate of nickel can reach 99%, the purity of nickel can reach 99%, and the current efficiency can reach 54.3%.

Concrete operation embodiment 3:

1. The concentration of nickel ions in the waste water is 2g/L, the pH value of the control solution is 4, the electrolytic cell is filled with 3-3.5mm sand particles, and the distance between the plates is 80mm;

2. Put the suction end of the circulating pump inlet pipe 3 with the filter 12 into the electroplating wastewater storage tank 2, and the circulating pump 13 pumps the treated wastewater into the circulating fluidized bed 1 through the fluidized bed inlet pipe 4 to control the liquid The flow rate is 10cm/s, so that the sand particles are in a state of fluidized movement, and the particles do not overflow the bed;

3. Start the power supply, control the current density to 80A/m ² , and carry out metal nickel recovery. After the nickel thickness deposited on the cathode plate 8 reaches 2-3 mm, the cathode plate 8 is peeled off, and the cleaned cathode plate 8 is put back to the original place, and the process is continued. Operations for the recovery of metallic nickel.

4. The recovered electroplating wastewater is treated by the membrane and returned to the preparation of the electroplating solution. After 10 cycles of operation, it is treated by the membrane and discharged after reaching the discharge standard.

The recovery rate of nickel is 99%, the purity of nickel is 99%, and the current efficiency is 60%.

Concrete operation embodiment 4:

1. The concentration of nickel ions in the wastewater is 5g/L, the pH value of the control solution is 4.5, the electrolytic cell is filled with 3.5-5mm sand, and the distance between the plates is 150mm;

2. Put the suction end of the circulating pump inlet pipe 3 with the filter 12 into the electroplating wastewater storage tank 2, and the circulating pump 13 pumps the treated wastewater into the circulating fluidized bed 1 through the fluidized bed inlet pipe 4 to control the liquid The flow rate is 15cm/s, so that the sand particles are in a state of fluidized movement, and the particles do not overflow the bed;

3. Start the power supply, control the current density to 120A/m ² , and carry out metal nickel recovery. After the thickness of nickel deposited on the cathode plate 8 reaches 2-3 mm, the cathode plate 8 is peeled off, and the cleaned cathode plate 8 is put back to the original place, and the process is continued. Operations for the recovery of metallic nickel.

4. The recovered electroplating wastewater is returned to the preparation of the electroplating solution after being treated by the membrane; after 10 cycles of operation, it is treated by the membrane and discharged after reaching the discharge standard.

The recovery rate of nickel is 99%, the purity of nickel is 99%, and the current efficiency is 80%.

Claims (5)

1. a device for reclaiming metal nickel ions in electroplating waste water, it comprises fluidized bed and waste water storage tank, it is characterized in that: described fluidized bed is provided with the water inlet and the water outlet that all communicate with waste water storage tank, Moreover, fluidized particles are contained in the fluidized bed, and cathode plates and anode plates are arranged symmetrically; and a liquid distribution plate is arranged at the bottom of the fluidized bed, and fluidized particles are located on the liquid distribution plate. 2. The device for recovering metal nickel ions in electroplating wastewater according to claim 1, characterized in that: the water inlet of the fluidized bed communicates with the wastewater storage tank through a pipeline, and a circulating pump is arranged on the pipeline. 3. The device for recovering metal nickel ions in electroplating wastewater according to claim 1, characterized in that: there are many pairs of cathode and anode plates placed in parallel in the fluidized bed, equidistant between the cathode plates and the anode plates They are arranged at intervals, and the distance between adjacent anode plates and cathode plates is 50-150mm. 4. The device for recovering metal nickel ions in electroplating wastewater according to any one of claims 1 and 2, characterized in that: the water inlet end of the circulating pump is provided with a filter, and the filter is placed in the wastewater storage tank middle. 5. according to the device of claim 1 or 3 described reclaiming metallic nickel ions in electroplating wastewater, it is characterized in that: described anode plate is the lead plate of thickness 3-10mm, and cathode plate is the metal plate of titanium plating, Thickness 4-6mm.

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