Nickel recovery equipment and nickel recovery process

Abstract

The invention discloses nickel recovery equipment and a nickel recovery process. The nickel recovery equipment comprises an adjusting mechanism, an adsorption mechanism, a pickling mechanism and a control device, the adjusting mechanism comprises an adjusting device, a filtering device and a source water device, the adjusting device is in butt joint with the filtering device, and the filtering device is in butt joint with the source water device; the adsorption mechanism comprises a resin tower and an alkali liquor adding device, the resin tower is in butt joint with the source water device, the alkali liquor adding device is in butt joint with the resin tower, and the resin tower is provided with a spectrophotometer; the pickling mechanism comprises an acid liquor adding device and a saturated liquor collecting device, the acid liquor adding device is in butt joint with the saturated liquor collecting device and the resin tower, and the acid liquor adding device is in butt joint with the resin tower; and the control device is electrically connected with the adjusting mechanism, the adsorption mechanism and the pickling mechanism. Through the nickel recovery equipment, the nickel recovery efficiency can be improved, the nickel recovery equipment is convenient and rapid, meanwhile, resin regeneration is achieved, continuous production is achieved, the production benefit is improved, and the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of nickel recovery and processing, in particular to nickel recovery equipment and a nickel recovery process. Background Art

[0002] Nickel content in electroplating wastewater is one of the environmental management indicators for wastewater discharge. During electroplating, the nickel sulfate and nickel chloride added to the plating tanks are mostly carried over from the workpieces and flow into the wastewater treatment plant. However, nickel ions are still present in the wastewater. Current nickel recovery methods typically use adsorption in single or triple resin towers, followed by manual or fixed-time periodic determination. However, this can lead to inadequate nickel recovery, resulting in repeated operations and increased recovery costs. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a nickel recovery device and a nickel recovery process, which can fully recover nickel in wastewater while reducing the recovery cost.

[0004] According to the first aspect of the present invention, the nickel recovery equipment includes: a regulating mechanism, an adsorption mechanism, a pickling mechanism and a control device; the regulating mechanism includes a regulating device, a filtering device and a source water device, the water outlet end of the regulating device is connected to the water inlet end of the filtering device, and the water outlet end of the filtering device is connected to the water inlet end of the source water device; the adsorption mechanism includes a resin tower and an alkali solution adding device, the source water inlet end of the resin tower is connected to the water outlet end of the source water device, the alkali solution adding device is connected to the alkali solution inlet end of the resin tower, and the resin tower is provided with a spectrophotometer; the pickling mechanism includes an acid solution adding device and a saturated liquid collecting device, the water outlet end of the acid solution adding device is connected to the saturated liquid collecting device and the acid solution inlet end of the resin tower respectively, and the water inlet end of the acid solution adding device is connected to the acid solution outflow end of the resin tower; the control device is electrically connected to the regulating mechanism, the adsorption mechanism and the pickling mechanism respectively.

[0005] In some embodiments of the present invention, a breathing valve and a safety valve are provided at the upper end of the resin tower, and both the breathing valve and the safety valve are communicated with the resin tower.

[0006] In some embodiments of the present invention, a vortex component is provided in the resin tower, and the vortex component includes an air inlet pipe, an air outlet pipe and a control valve. The control valve is connected to the air inlet pipe, and the control valve is electrically connected to the control device. The air inlet pipe extends into the resin tower in a horizontal direction, and the air outlet pipe is provided in the resin tower in a vertical direction. The air outlet pipe is connected to the air inlet pipe, and the air outlet pipe is provided with a plurality of air outlet holes.

[0007] In some embodiments of the present invention, a breathing valve and a safety valve are provided at the upper end of the resin tower, and both the breathing valve and the safety valve are communicated with the interior of the resin tower.

[0008] In some embodiments of the present invention, an infrared transmitter and an infrared receiver are provided in the resin tower, and both the infrared transmitter and the infrared receiver are electrically connected to the control device, and the infrared transmitter and the infrared receiver are provided correspondingly.

[0009] In some embodiments of the present invention, two groups of water distribution components are provided in the resin tower, and the two groups of water distribution components are respectively arranged at both ends of the resin tower. The water distribution components include a partition plate and a plurality of water distributors. The partition plate cooperates with the inner wall of the resin tower to form a receiving space at the end of the resin tower. An array of multiple water distributors is arranged on the side of the partition plate facing away from the receiving space, and the water distributors are connected to the receiving space.

[0010] In some embodiments of the present invention, two resin towers are provided, a series pipe is provided between the two resin towers, a switch valve is provided on the series pipe, and the series pipes are both connected to the two resin towers.

[0011] In some embodiments of the present invention, the source water device includes an active water tank and a source water pump, the water outlet of the filter device is connected to the source water tank, the source water pump is electrically connected to the control device, and the source water tank is connected to the resin tower through the source water pump.

[0012] The nickel recovery process according to the second embodiment of the present invention is applied to the nickel recovery equipment described in the first embodiment of the present invention, comprising the following steps:

[0013] (1) Collecting wastewater into a regulating device and adjusting the pH value of the wastewater;

[0014] (2) adding a fungicide to the regulating device;

[0015] (3) The filtration device filters the wastewater to the source water device, and transports the wastewater to the resin tower for adsorption;

[0016] (4) After the adsorption is completed, the acid adding device sends the acid into the resin tower to elute the resin;

[0017] (5) The eluate is sent back to the acid addition device, and the saturation of the eluate is detected. If the eluate is saturated, the eluate is sent to the saturated liquid collection device. If the eluate is not saturated, it is left in the acid addition device for the next elution.

[0018] (6) The alkali solution adding device adds alkali solution into the resin tower to regenerate the resin tower.

[0019] In some embodiments of the present invention, in step (3), the spectrophotometer detects the nickel concentration in the wastewater in the resin tower, and the source water device changes the flow rate of the wastewater delivered to the resin tower according to the detected nickel concentration.

[0020] Compared with the prior art, the nickel recovery equipment and nickel recovery process of the embodiment of the present invention have the following beneficial effects: after the pH value of the wastewater is adjusted by the adjustment device, it is sent to the source water device after sterilization and filtration. The source water device transports the adjusted wastewater to the resin tower for adsorption treatment. According to the change of nickel concentration in the wastewater detected by the spectrophotometer, the control device drives the source water device to change the wastewater delivery volume to avoid the resin adsorption rate being reduced when the nickel concentration is low, and the wastewater washing the resin, resulting in insufficient nickel adsorption, causing the nickel to flow to the wastewater station. By reducing the flow rate of the wastewater, the adsorption of the resin is ensured, the flow of nickel ions to the wastewater station is reduced, and the nickel recovery efficiency is improved. Then, the nickel in the resin is eluted by the acid washing mechanism. By detecting the concentration of the eluent, it is determined whether the nickel in the resin has been completely eluted. Monitoring is convenient and cost-saving. Then, the eluent is recovered to achieve nickel recovery. Then, the alkali solution is transported to the resin tower by the alkali solution addition mechanism to achieve resin regeneration. This is convenient and fast, and continuous production is achieved, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of a nickel recovery device according to an embodiment of the first aspect of the present invention;

[0022] Figure 2 1. A cross-sectional view of a resin tower in a nickel recovery device according to an embodiment of the first aspect of the present invention;

[0023] Figure 3 A top view of a water distributor and a partition plate in a nickel recovery device according to an embodiment of the first aspect of the present invention;

[0024] Figure 4 This is a top view of the air inlet pipe in the nickel recovery equipment of the first embodiment of the present invention.

[0025] Description of reference numerals:

[0026] Regulating device 110; filtering device 120; source water device 130; source water tank 131; source water pump 132;

[0027] Resin tower 210; series pipe 211; switch valve 212; alkali solution adding device 220; breathing valve 231; safety valve 232; partition plate 241;

[0028] Water distributor 242; accommodating space 243; air inlet pipe 251; air outlet pipe 252; air outlet 253; first pipe 254; second pipe 255; infrared transmitter 261; infrared receiver 262; spectrophotometer 270;

[0029] Acid solution adding device 310; saturated liquid collecting device 320. DETAILED DESCRIPTION

[0030] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0031] The nickel recovery device of the first embodiment of the present invention includes: a regulating mechanism, an adsorption mechanism, a pickling mechanism and a control device; the regulating mechanism includes a regulating device 110, a filtering device 120 and a source water device 130, the water outlet of the regulating device 110 is connected to the water inlet of the filtering device 120, and the water outlet of the filtering device 120 is connected to the water inlet of the source water device 130; the adsorption mechanism includes a resin tower 210 and an alkali solution adding device 220, the source water inlet of the resin tower 210 is connected to the water outlet of the source water device 130 The ends are docked, the alkali liquid adding device 220 is docked with the alkali liquid inlet end of the resin tower 210, and the resin tower 210 is provided with a spectrophotometer 270; the pickling mechanism includes an acid liquid adding device 310 and a saturated liquid collecting device 320, the water outlet end of the acid liquid adding device 310 is docked with the saturated liquid collecting device 320 and the acid liquid inlet end of the resin tower 210 respectively, and the water inlet end of the acid liquid adding device 310 is docked with the acid liquid outflow end of the resin tower 210; the control device is electrically connected to the regulating mechanism, the adsorption mechanism and the pickling mechanism respectively.

[0032] After the wastewater is sent to the conditioning device 110, its pH is adjusted by adding purified water. A non-oxidizing fungicide is then added to the wastewater to reduce the inhibition of fungal growth, prevent it from affecting the resin's adsorption of nickel ions, and minimize its impact on the resin's adsorption capacity. This also improves the purity of the saturated eluate obtained from subsequent acid washing. Furthermore, the filtration device 120 filters other impurities from the wastewater, improving the purity of the nickel ions and reducing the impact of these impurities on nickel ion recovery.

[0033] It will be appreciated that a vortex assembly is provided within resin tower 210. The vortex assembly includes an inlet pipe 251, an outlet pipe 252, and a control valve. The control valve is connected to inlet pipe 251 and electrically connected to a control device. Inlet pipe 251 extends horizontally into resin tower 210, while outlet pipe 252 is vertically disposed within resin tower 210 and communicates with inlet pipe 251. Outlet pipe 252 is defined by multiple outlet holes 253. When the control valve is opened, compressed gas enters outlet pipe 252 through inlet pipe 251 and is ejected through outlet holes 253. The ejected gas rotates the liquid, forming a vortex that stirs the liquid and improves adsorption, elution, and regeneration efficiency.

[0034] Specifically, the air inlet pipe 251 includes a first pipe 254 and a second pipe 255. The first pipe 254 is connected to the second pipe 255, and the second pipe 255 is connected to the air outlet pipe 252. The first pipe 254 extends from the outside into the resin tower 210 and connects to the external air source. The second pipe 255 is annular as a whole and is horizontally arranged in the resin tower 210. There are multiple air outlet pipes 252, and the multiple air outlet pipes 252 are arranged along the circumference of the second pipe 255. The air outlet holes 253 are arranged in sequence along the circumference of the second pipe 255, so that after the gas is blown out, a vortex is formed in the resin tower 210, thereby improving the success rate of forming a vortex.

[0035] It is understandable that the upper end of the resin tower 210 is provided with a breathing valve 231 and a safety valve 232, both of which are connected to the interior of the resin tower 210 and are electrically connected to the control device. When the outlet pipe 252 stirs the liquid, the air pressure in the resin tower 210 increases, and the gas entering the resin tower 210 from the inlet pipe 251 is discharged through the breathing valve 231, thereby preventing the air pressure in the resin tower 210 from continuously increasing and damaging the resin tower 210, thereby reducing safety risks. At the same time, the breathing valve 231 can prevent the outside from contaminating the resin tower 210. When the resin tower 210 is undergoing acid washing, water washing, and resin regeneration, if it is affected by abnormal reasons and the pressure in the tower increases, the safety valve 232 automatically opens to release the pressure, reducing the pressure in the resin tower 210. At the same time, the control device immediately stops the operation of all equipment and sounds an alarm, which can effectively protect the equipment and reduce the risk of equipment damage.

[0036] It is understood that an infrared emitter 261 and an infrared receiver 262 are provided within the resin tower 210. Both the infrared emitter 261 and the infrared receiver 262 are electrically connected to the control device and are disposed in correspondence with each other. The infrared emitter 261 and the infrared receiver 262 are both mounted near the upper end of the resin tower 210. During the resin regeneration phase, when the resin expands to a height between the infrared emitter 261 and the infrared receiver 262, the infrared receiver 262 is blocked from receiving infrared rays. This serves to determine whether the resin has been regenerated, enabling convenient and quick automatic detection of resin regeneration. When the control device detects a positive signal from the infrared receiver 262, it controls the source water device 130 to initiate a new round of adsorption, achieving automated adsorption processing and improving production efficiency.

[0037] It is understood that two water distribution assemblies are provided within the resin tower 210, one at each end of the resin tower 210. The water distribution assemblies include a partition plate 241 and a plurality of water distributors 242. The partition plate 241 cooperates with the inner wall of the resin tower 210 to form a receiving space 243 at the end of the resin tower 210. The plurality of water distributors 242 are arranged in an array on the side of the partition plate 241 facing away from the receiving space 243, and the water distributors 242 are in communication with the receiving space 243. Wastewater enters the resin tower 210 from the top. The source water device 130 transports the wastewater to the receiving space 243 located at the top of the resin tower 210, and then enters the resin tower 210 through the water distributors 242. The water distributors 242 fully disperse the wastewater entering the resin tower 210, allowing the nickel-containing wastewater to fully contact and adsorb the resin, thereby reducing the escape of metallic nickel ions with the wastewater. It should be noted that the resin tower 210 is made of PPN, which has good toughness, strong welding ability, high temperature resistance (≤100°C) and pressure resistance (≤1.0MPa), strong acid and alkali resistance, and is easier to weld and manufacture, which is convenient for the layout of the water distributor 242.

[0038] In addition, acid enters the resin tower 210 from the lower end, flows into the water storage space below, and then enters the resin tower 210 through the water distributor 242. The acid then fills the resin tower 210, ensuring full contact between the acid and the resin. After elution for a set time, the acid is discharged through the upper water distributor 242 of the resin tower 210 and returned to the acid addition device 310. If the refluxed eluent is saturated, it is sent to the saturated liquid collection device 320. If it is not saturated, it is retained for the next elution and sent to the saturated liquid collection device 320 until it is saturated. The acid addition device 310 is then replenished with acid. Similarly, alkali enters the lower end of the resin tower 210 to replenish the resin until the resin is regenerated. The consumed liquid then returns to the alkali addition device 220 from the upper part of the resin tower 210 and is then discharged through the Jianye addition device.

[0039] It is understood that two resin towers 210 are provided, and a series pipe 211 is provided between the two resin towers 210. The series pipe is provided with an on-off valve 212, and the series pipe 211 is connected to both resin towers 210. When one resin tower 210 reaches saturated adsorption, but the wastewater still contains nickel ions, the on-off valve 212 can be opened to connect the two resin towers 210 via the series pipe 211, and the wastewater can be transferred to the other resin tower 210 for continued adsorption. The on-off valve 212 is then closed, and the saturated resin is acid-washed and regenerated, thereby improving production efficiency while ensuring the recovery efficiency of nickel in the wastewater.

[0040] It is understood that the source water device includes an active water tank 131 and a source water pump 132. The water outlet of the filter device 120 is connected to the source water tank 131. The source water pump 132 is electrically connected to the control device. The source water tank 131 is connected to the resin tower 210 via the source water pump 132. The filter device 120 filters the wastewater into the source water tank 131, and then the source water pump 132 transports the wastewater to the resin tower 210.

[0041] The nickel recovery process of the second embodiment of the present invention is applied to the nickel recovery equipment of the first embodiment of the present invention, comprising the following steps:

[0042] (1) Collecting the wastewater into the regulating device 110 and adjusting the pH value of the wastewater to avoid neutralization of the acid and alkali of the resin and to avoid affecting the adsorption capacity of the resin;

[0043] (2) Adding a fungicide into the regulating device 110 to kill the fungi, reduce the impact on the resin adsorption capacity and improve the purity of the subsequent saturated liquid;

[0044] (3) The filter device 120 filters the wastewater to the source water device 130, and transports the wastewater to the resin tower 210 for adsorption. During adsorption, the concentration of nickel ions is detected and the flow rate of the wastewater is adjusted to prevent the wastewater from flushing the resin, affecting the resin adsorption rate, and causing an increase in nickel flowing out to the wastewater station;

[0045] (4) After the adsorption is completed, the acid adding device 310 sends the acid into the resin tower 210 to elute the resin;

[0046] (5) After the set elution time is reached, the eluate is sent back to the acid solution adding device 310, and the pH value of the eluate is detected. If the pH value reaches the set value, the eluate is saturated, and the eluate is sent to the saturated liquid collecting device 320, and then the acid solution is replenished and the elution is continued. If the pH value does not reach the set value, the eluate is not saturated and remains in the acid solution adding device 310 for the next elution;

[0047] (6) The alkali solution adding device 220 adds alkali solution into the resin tower 210 to regenerate the resin tower 210. During resin regeneration, if the resin has not reached the set height, alkali solution is continuously added quantitatively until the resin production reaches the set height. After the resin reaches the set height, the pH value of the alkali solution is detected. If it is less than the set pH value, it is discharged. If it is greater than the set pH value, it is retained until the next resin regeneration.

[0048] It is understood that in step (3), the spectrophotometer 270 detects the nickel concentration in the wastewater in the resin tower 210, and the source water device 130 changes the flow rate of the wastewater delivered to the resin tower 210 based on the detected nickel concentration. If the nickel concentration in the wastewater decreases, the flow rate of the wastewater is reduced to prevent the wastewater from flushing the resin, resulting in a decrease in the resin adsorption efficiency and thus affecting the resin adsorption.

[0049] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary counting personnel in this technical field, several improvements and substitutions can be made without departing from the counting principle of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. Nickel recovery equipment, characterized in that, Includes: The regulating mechanism includes a regulating device, a filtering device and a source water device, wherein the water outlet of the regulating device is connected to the water inlet of the filtering device, and the water outlet of the filtering device is connected to the water inlet of the source water device; The adsorption mechanism includes a resin tower and an alkali solution adding device, wherein the source water inlet of the resin tower is connected to the water outlet of the source water device, the alkali solution adding device is connected to the alkali solution inlet of the resin tower, and the resin tower is provided with a spectrophotometer; The pickling mechanism includes an acid liquid adding device and a saturated liquid collecting device, wherein the water outlet of the acid liquid adding device is connected to the saturated liquid collecting device and the acid liquid inlet of the resin tower respectively, and the water inlet of the acid liquid adding device is connected to the acid liquid outflow end of the resin tower; The control device is electrically connected to the regulating mechanism, the adsorption mechanism and the pickling mechanism respectively.

2. The nickel recovery equipment according to claim 1, characterized in that A vortex component is provided in the resin tower, and the vortex component includes an air inlet pipe, an air outlet pipe and a control valve. The control valve is connected to the air inlet pipe, and the control valve is electrically connected to the control device. The air inlet pipe extends into the resin tower in a horizontal direction, and the air outlet pipe is provided in the resin tower in a vertical direction. The air outlet pipe is connected to the air inlet pipe, and the air outlet pipe is provided with a plurality of air outlet holes.

3. The nickel recovery equipment according to claim 2, characterized in that A breathing valve and a safety valve are provided at the upper end of the resin tower, and both the breathing valve and the safety valve are communicated with the interior of the resin tower.

4. The nickel recovery equipment according to claim 1, characterized in that An infrared transmitter and an infrared receiver are arranged in the resin tower. Both the infrared transmitter and the infrared receiver are electrically connected to the control device. The infrared transmitter and the infrared receiver are arranged correspondingly.

5. The nickel recovery equipment according to claim 1, characterized in that Two groups of water distribution components are provided in the resin tower, and the two groups of water distribution components are respectively arranged at both ends of the resin tower. The water distribution components include a partition plate and multiple water distributors. The partition plate cooperates with the inner wall of the resin tower to form a receiving space at the end of the resin tower. An array of multiple water distributors is arranged on the side of the partition plate facing away from the receiving space, and the water distributors are connected to the receiving space.

6. The nickel recovery equipment according to claim 1, characterized in that There are two resin towers, a series pipe is provided between the two resin towers, an on-off valve is provided on the series pipe, and the series pipes are both connected to the two resin towers.

7. The nickel recovery equipment according to claim 1, characterized in that The source water device includes an active water tank and a source water pump. The water outlet of the filter device is connected to the source water tank. The source water pump is electrically connected to the control device. The source water tank is connected to the resin tower through the source water pump.

8. Nickel recovery process, characterized in that, The nickel recovery device according to any one of claims 1 to 7 comprises the following steps: (1) Collecting wastewater into a regulating device and adjusting the pH value of the wastewater; (2) adding a fungicide to the regulating device; (3) The filtration device filters the wastewater to the source water device, and transports the wastewater to the resin tower for adsorption; (4) After the adsorption is completed, the acid adding device sends the acid into the resin tower to elute the resin; (5) The eluate is returned to the acid addition device, and the saturation of the eluate is detected. If the eluate is saturated, the eluate is sent to the saturated liquid collection device. If the eluate is not saturated, it is left in the acid addition device for the next elution. (6) The alkali solution adding device adds alkali solution into the resin tower to regenerate the resin tower.

9. The nickel recovery process according to claim 8, characterized in that In the step (3), the spectrophotometer detects the nickel concentration in the wastewater in the resin tower, and the source water device changes the flow rate of the wastewater transported to the resin tower according to the detected nickel concentration.

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