Multi-stage oil removal device and method for copper-electricity pregnant solution

Abstract

The invention provides a multi-stage oil removal device and method for copper electricity rich liquor, and relates to the technical field of copper hydrometallurgy. The device comprises a pump, a micro-nano bubble generator and an oil removal tank, a first discharge port in the bottom of the oil removal tank is connected with the micro-nano bubble generator through the pump, and an outlet of the micro-nano bubble generator is connected to a gas-liquid inlet of the oil removal tank. The interior of the oil removal tank is divided into an air flotation oil removal area and an adsorption oil removal area through a vertical overflow baffle, a liquid level plate is arranged on the upper portion of the overflow baffle, a gas-liquid inlet is formed in the lower portion of the air flotation oil removal area, two layers of horizontal blocking partition plates are arranged on the lower portion of the adsorption oil removal area, and a vertical porous seepage plate is arranged on the lower portion of the lower blocking partition plate close to a discharging opening in the bottom of the side wall. Fiber balls are filled at the lower part of the blocking clapboard; and an overflow weir is arranged on the side of the top of the adsorption deoiling area. Through micro-nano bubble air flotation oil removal and fiber ball adsorption oil removal, the oil content in the electro-pregnant solution is effectively reduced, the high-quality and qualified electro-pregnant solution is provided for electro-deposition operation, the influence of organic matter on the electro-deposition operation is reduced, and high-quality cathode copper is obtained.

Description

Technical Field

[0001] The invention relates to the technical field of copper hydrometallurgy, and in particular to a copper electro-rich liquid multi-stage oil removal device and method. Background Art

[0002] Solvent extraction-electrodeposition has become an important part of wet copper smelting due to its advantages of no pollution, low energy consumption and easy operation. However, in most solvent extraction operations, a small amount of organic phase enters the electro-rich solution after the stripping operation. These organic phases are mainly extractants and have a small content of diluents. When the organic phase in the electro-rich solution reaches a certain amount, it will be deposited on the cathode plate, causing the cathode copper plate to change color and form "organic burn spots". Due to the entrainment of impurities in the "burn spot" area, the sulfur content of the cathode copper will exceed the standard.

[0003] At present, there are many methods for oil removal, mainly including the static method of inclined plate oil separator, resin adsorption method, modified fiber method, membrane filtration method, ultrasonic method, flotation method, etc. In the process of treating organic matter in copper electrolytic rich solution, flotation method and adsorption method are the most common. With the current technical level, although flotation method and adsorption method can obtain qualified electrolytic rich solution, there are many problems. For example, flotation method cannot effectively solve dissolved oil and emulsified oil, resulting in a small amount of oil droplets entering the electrolytic system and gradually accumulating; adsorption method has problems such as unstable adsorption index, slow oil removal, and regular replacement of adsorption materials.

[0004] In combination with the properties of copper electro-rich liquid and the problems existing in the current treatment process, a deep oil removal device with micro-nano bubble flotation + fiber ball adsorption is designed. The principle is to introduce micro-nano bubbles generated by a micro-nano bubble generator into the electro-rich liquid with oil phase, and through the adhesion of micro-nano bubbles to oil droplets, the oil droplets are aggregated into flocs, which float to the surface of the water body under the action of buoyancy, and the remaining oil droplets are adsorbed by fiber balls in the specially designed adsorption and oil removal area, so as to achieve deep oil removal and obtain qualified electro-rich liquid. This method can not only improve the oil removal efficiency of electro-rich liquid, but also shorten the oil removal cycle, do not need to add any auxiliary agents, and prolong the service life of the adsorption material. Summary of the invention

[0005] In order to solve the problems of low oil removal efficiency, slow oil removal speed, short life of adsorption materials and frequent replacement of copper electrolytic rich liquid in the prior art, the embodiment of the present invention provides a multi-stage oil removal device and method for copper electrolytic rich liquid. The technical solution is as follows:

[0006] A copper electrolytic rich liquid multi-stage oil removal device, comprising a pump, a micro-nano bubble generator and an oil removal tank,

[0007] The bottom outlet of the degreasing tank is connected to a micro-nano bubble generator through a pump, and the outlet of the micro-nano bubble generator is connected to the gas-liquid inlet of the degreasing tank;

[0008] The degreasing tank is divided into an air flotation degreasing zone and an adsorption degreasing zone by a vertical overflow baffle, and the air flotation degreasing zone and the adsorption degreasing zone are divided into two parts with a width of 1:3 by the overflow baffle;

[0009] The lower part of the air flotation deoiling zone is provided with a gas-liquid inlet.

[0010] The lower side wall of the adsorption deoiling zone has two bottom outlets.

[0011] The lower part of the adsorption and oil removal zone is provided with two horizontal barrier baffles, and a vertical porous seepage plate is provided at the lower part of the lower barrier baffle near the bottom outlet of the side wall.

[0012] The lower part of the blocking partition is filled with fiber balls.

[0013] An overflow weir is provided on the top side of the adsorption oil removal zone.

[0014] The overflow baffle is 100-150 mm higher than the upper blocking baffle. A liquid level plate is provided in close proximity to the overflow baffle on one side of the flotation deoiling zone. The liquid level plate can move up and down to adjust the liquid level, control the liquid to enter the adsorption deoiling zone, and control the discharge of scum by controlling the liquid level.

[0015] The pump is an oil-water dual-purpose electric pump with a rated flow rate of 4.2 m 3 / h, suction lift is 3-8 m, head is 8-20 m, flow rate is 0.5-1.0 m 3 / h.

[0016] The micro-nano bubble generator is a gas-liquid mixed micro-nano bubble generator, and the bubble diameter generated is 1-100 μm, and the air intake volume is 0.4-1 L / m 3 , outlet flow rate is 0.5-1.0 m 3 / h, air bubbles enter the degreasing tank from the bottom gas-liquid inlet in the form of aeration.

[0017] Generally, when air enters the microbubble generator through a pipe, it is fully mixed with qualified electro-rich liquid, and then stirred and pressurized by the equipment to produce micro-nano bubbles with a diameter of 1~100 μm, which are then released in the form of aeration through a release device.

[0018] A seepage hole is opened on one side of the blocking baffle, and the seepage hole area occupies 1 / 4 to 1 / 2 of the area of ​​the blocking baffle. The diameter of the seepage hole is 5 to 10 mm, and the interval between adjacent seepage holes is 10 to 15 mm; wherein, the upper blocking baffle is 150-200 mm away from the liquid surface, the distance between the two blocking baffles is 100 mm, the seepage hole area of ​​the upper blocking baffle is close to the overflow weir side, and the seepage hole area of ​​the lower blocking baffle is close to the overflow baffle side.

[0019] The porous seepage plate has a height of 100 mm, a buffer zone is provided between the porous seepage plate and the bottom outlet, and the porous seepage plate is 100 mm away from the bottom outlet;

[0020] The seepage holes on the porous seepage plate have a diameter of 5-10 mm, and the interval between adjacent seepage holes is 10-15 mm.

[0021] The fiber balls are filled between the two layers of barrier baffles and between the lower barrier baffle and the porous seepage plate. The fiber balls are polyester, polypropylene or acrylic fiber adsorption balls, and the fiber balls have a diameter of 20-30 mm. This method prolongs the flow path of the electro-rich solution in the adsorption and oil removal zone, and increases the collision probability between the oil droplets in the copper electro-rich solution and the fiber adsorption balls.

[0022] The application method of the copper electrolytic rich liquid multi-stage oil removal device comprises the following steps:

[0023] S1. Add qualified electro-enriched liquid into the adsorption and degreasing zone and buffer zone of the degreasing tank, and introduce the qualified electro-enriched liquid into the micro-nano bubble generator as a liquid phase medium through a pump;

[0024] S2. Add the oil-containing electrolyte-rich liquid after stripping to the flotation deoiling zone of the deoiling tank, turn on the micro-nano bubble generator to perform micro-nano flotation deoiling, and continuously feed the oil-containing electrolyte-rich liquid as raw material above the deoiling tank;

[0025] S3. Micro-nano bubbles adsorb the oil droplets in the oil-containing electrolyte and float them to the top of the electrolyte and gradually gather. When the oil layer reaches a certain thickness (generally 20-30 mm), the liquid level plate, feeding speed, and bottom outlet flow rate are adjusted to raise the liquid level in the tank, and the scum is discharged from the overflow weir of the de-oiling tank.

[0026] S4. After flotation oil removal is completed, the electro-rich liquid passes through the barrier baffle and enters the adsorption oil removal area filled with fiber balls for deep oil removal. After the oil removal, a part of the electro-rich liquid returns to the micro-nano bubble generator through the bottom outlet 1 as a liquid medium, and the remaining part is discharged from the system through the bottom outlet 2 to enter the electrolytic deposition operation.

[0027] The oil content in the qualified electro-rich solution in step S1 is less than 10 ppm;

[0028] The oil-containing electro-rich liquid in step S2 is obtained by stripping, and the oil content is above 40 ppm. The flow rate fed into the oil removal tank is 0.5-1.0 m 3 / h.

[0029] The discharge flow rate of the electro-rich liquid after oil removal obtained in step S4 is 0.5-1.0 m 3 / h, the copper content in the electro-rich solution is not affected, and the oil content in the electro-rich solution is reduced to below 5 ppm.

[0030] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention include at least:

[0031] The above scheme adds a micro-nano bubble flotation oil removal process, combined with a fiber ball deep oil removal process, which greatly reduces the oil content in the electro-rich liquid; the process uses the adhesion of micro-nano bubbles to oil droplets to make the oil droplets aggregate into flocs, which float to the surface of the water body under the action of buoyancy, and can remove most of the oil droplets in the electro-rich liquid; after the first step of oil removal, the electro-rich liquid is deeply deoiled in the adsorption oil removal area. Compared with the oil removal method or oil removal device in the prior art, the oil removal efficiency is significantly improved, the oil removal cycle is shortened, the service life of the adsorption material is extended, and the operation is simple. Through this multi-stage oil removal device, the oil content in the electro-rich liquid is greatly reduced, providing high-quality raw materials for electrowinning operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 This is a schematic structural diagram of a copper electro-rich liquid multi-stage oil removal device provided by an embodiment of the present invention;

[0034] Figure 2 It is a schematic diagram of the structure of an oil removal tank in a copper electrolytic rich liquid multi-stage oil removal device provided in an embodiment of the present invention.

[0035] Among them: 1-pump; 2-micro-nano bubble generator; 3-oil removal tank; 4-overflow baffle; 5-fiber ball; 6-porous seepage plate; 7-overflow weir; 8-floatation oil removal area; 9-adsorption oil removal area; 10-barrier baffle; 11-liquid level plate; 12-gas-liquid inlet; 13-buffer zone; 14-bottom outlet one; 15-bottom outlet two. DETAILED DESCRIPTION

[0036] The technical solution of the present invention is described below in conjunction with the accompanying drawings.

[0037] In the embodiments of the present invention, words such as "exemplarily" and "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "example" in the present invention should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of the word "example" is intended to present the concept in a specific way. In addition, in the embodiments of the present invention, the meaning expressed by "and / or" can be both, or it can be either of the two.

[0038] In the embodiments of the present invention, sometimes a subscript such as W1 may be written as a non-subscript such as W1. When the difference is not emphasized, the meanings to be expressed are the same.

[0039] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0040] The embodiment of the present invention provides a copper electrolytic rich liquid multi-stage oil removal device and method. Figure 1 The copper electrolyte rich liquid multi-stage oil removal device shown in the figure comprises a pump 1, a micro-nano bubble generator 2 and an oil removal tank 3.

[0041] The bottom outlet 14 of the degreasing tank 3 is connected to the micro-nano bubble generator 2 through the pump 1, and the outlet of the micro-nano bubble generator 2 is connected to the gas-liquid inlet 12 of the degreasing tank 3;

[0042] The degreasing tank 3 is divided into a flotation degreasing area 8 and an adsorption degreasing area 9 by a vertical overflow baffle 4.

[0043] The lower part of the air flotation deoiling zone 8 is provided with a gas-liquid inlet 12.

[0044] The lower side wall of the adsorption and oil removal zone 9 is provided with two bottom outlets, namely, bottom outlet 14 and bottom outlet 2 15.

[0045] The lower part of the adsorption and oil removal zone 9 is provided with two horizontal barrier baffles 10, and a vertical porous seepage plate 6 is provided at the lower part of the lower barrier baffle near the bottom outlet of the side wall.

[0046] The lower part of the blocking baffle 10 is filled with fiber balls 5.

[0047] An overflow weir 7 is provided on the top side of the adsorption and oil removal zone 9 .

[0048] A liquid level plate 11 is closely disposed on one side of the overflow baffle 4, and the liquid level plate can move up and down to adjust the liquid level.

[0049] A buffer zone 13 is provided between the porous seepage plate 6 and the bottom outlet.

[0050] The application method of the copper electrolytic rich liquid multi-stage oil removal device comprises the following steps:

[0051] S1. Add qualified electro-enriched liquid into the adsorption and degreasing zone and buffer zone of the degreasing tank, and introduce the qualified electro-enriched liquid into the micro-nano bubble generator as a liquid phase medium through a pump;

[0052] S2. Add the oil-containing electrolyte-rich liquid after stripping to the flotation deoiling zone of the deoiling tank, turn on the micro-nano bubble generator for flotation deoiling, and continuously feed the oil-containing electrolyte-rich liquid as raw material above the deoiling tank;

[0053] S3. Micro-nano bubbles adsorb the oil droplets in the oil-rich liquid and float them to the liquid surface and gradually gather. When the oil layer reaches a certain thickness, the liquid level plate, feeding speed, and bottom outlet flow rate are adjusted to increase the liquid level in the tank, and the scum is discharged from the overflow weir of the de-oiling tank;

[0054] S4. After flotation oil removal is completed, the electro-rich liquid passes through the barrier baffle and enters the adsorption oil removal area filled with fiber balls for deep oil removal. After the oil removal, a part of the electro-rich liquid returns to the micro-nano bubble generator through the bottom outlet 1 as a liquid medium, and the remaining part is discharged from the system through the bottom outlet 2 to enter the electrolytic deposition operation.

[0055] This will be described below with reference to specific embodiments.

[0056] Example 1

[0057] The present embodiment provides a copper electrolytic rich liquid multi-stage oil removal device and an application process.

[0058] The oil removal device consists of a microbubble generator, a pump and an oil removal tank. The microbubble generator is the core of the system and is used to produce microbubbles. The pump is used to drain qualified electro-rich liquid into the microbubble generator as a liquid medium. The oil removal tank is divided into an air flotation oil removal area and an adsorption oil removal area to provide an area for the oil removal test. The specific oil removal tank structure is as follows: Figure 2 shown.

[0059] During the design process, the liquid level plate in the degreasing tank is designed as follows: the liquid level plate is close to one side of the blocking baffle, and a handle is set on the upper part of the liquid level plate. The liquid level plate is controlled to move up and down by the handle and the slide rails on both sides of the liquid level plate, and the bottom of the liquid level plate always coincides with the blocking baffle. After the electro-rich liquid completes the flotation degreasing, it flows over the liquid level plate and the blocking baffle, the oil residue floats to the liquid surface, and the electro-rich liquid enters the adsorption degreasing area.

[0060] The oil content in the qualified electro-rich liquid of a foreign hydrometallurgical plant is 10 ppm. It is pumped into the buffer zone of the deoiling tank as the liquid medium of the micro-nano bubble generator at a flow rate of 0.5 m 3 / h.

[0061] S1, the copper electrolyte (oil content 58 ppm) after on-site stripping is delivered to the middle of the flotation deoiling area through a pump and pipeline, with a flow rate of 0.5 m 3 / h. At the same time, the micro-nano bubble generator is turned on. After the air and the qualified electro-rich liquid are mixed through the micro-nano bubble generator, the qualified electro-rich liquid carries the micro-nano bubbles into the degreasing tank. The flow rate is 0.5 m 3 / h, the diameter of microbubbles is controlled at about 40 μm. Open outlets 1 and 2 to start the circulation and discharge of qualified electro-enriched liquid. After the microbubbles adsorb the oil droplets, they carry the oil droplets up and float to the liquid surface under the action of buoyancy. Most of the oil droplets are separated from the electro-enriched liquid and float to the liquid surface. The electro-enriched liquid then crosses the overflow baffle and enters the adsorption and oil removal area.

[0062] S2, after the flotation degreasing, the copper electrolyte enters the adsorption degreasing area for deep degreasing. After degreasing, part of the electrolyte is introduced into the micro-nano bubble generator from the bottom outlet through a pump. The flow rate is 0.5 m 3 / h, and the rest of the electro-rich liquid is discharged through the bottom outlet 2. When the oil layer on the liquid surface reaches a certain thickness (generally 20~30 mm), the regulating valve reduces the flow of outlet 2 and raises the liquid level plate to raise the liquid level in the degreasing tank. The oil layer accumulated on the liquid surface is naturally discharged from the degreasing tank through the overflow weir. After the oil residue on the liquid surface is discharged, the outlet 2 is restored to the original flow, and the feed flow of the oil-containing copper electro-rich liquid is reduced at the same time. After the liquid level drops back to the original height, the feed flow is restored.

[0063] The oil content of the electro-rich liquid after oil removal is measured.

[0064] After calculation, the oil content of the electro-enriched liquid after multi-stage oil removal is less than 5 ppm, and the oil removal rate can reach more than 90%. Compared with the adsorption method, the oil removal cycle is shortened by 20% and the fiber ball replacement cycle is extended by 1 time.

[0065] It can be seen that the application of the method of the present invention can achieve efficient oil removal of the electro-rich liquid after stripping, which can not only reduce the oil content in the electro-rich liquid and provide high-quality raw materials for electrowinning operations, but also shorten the oil removal cycle and extend the life of the fiber balls.

[0066] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A copper electrolytic rich liquid multi-stage oil removal device, characterized in that: It includes a pump, a micro-nano bubble generator and a degreasing tank; The bottom outlet of the degreasing tank is connected to a micro-nano bubble generator through a pump, and the outlet of the micro-nano bubble generator is connected to the gas-liquid inlet of the degreasing tank. The degreasing tank is divided into a flotation degreasing zone and an adsorption degreasing zone by a vertical overflow baffle. The lower part of the air flotation deoiling zone is provided with a gas-liquid inlet. The lower side wall of the adsorption deoiling zone has two bottom outlets. The adsorption and oil removal area is provided with two layers of horizontal barrier baffles, and a vertical porous seepage plate is provided at the lower part of the lower barrier baffle near the bottom outlet of the side wall. The lower part of the blocking partition is filled with fiber balls. An overflow weir is provided on the top side of the adsorption oil removal zone.

2. The copper electrolytic rich liquid multi-stage oil removal device according to claim 1 is characterized in that: The overflow baffle is 100-150 mm higher than the upper baffle in the baffle. A liquid level plate is provided on one side of the flotation deoiling zone of the overflow baffle. The liquid level plate can move up and down to adjust the liquid level and control the liquid to enter the adsorption deoiling zone.

3. The copper electrolytic rich liquid multi-stage oil removal device according to claim 1 is characterized in that: The pump is an oil-water dual-purpose electric pump with a rated flow rate of 4.2 m 3 / h, suction lift is 3-8 m, head is 8-20 m, flow rate is 0.5-1.0 m 3 / h.

4. The copper electrolytic rich liquid multi-stage oil removal device according to claim 1, characterized in that: The micro-nano bubble generator is a gas-liquid mixed micro-nano bubble generator, and the bubble diameter generated is 1-100 μm, and the air intake volume is 0.4-1 L / m 3 , outlet flow rate is 0.5-1.0 m 3 / h, air bubbles enter the degreasing tank from the bottom gas-liquid inlet in the form of aeration.

5. The copper electrolytic rich liquid multi-stage oil removal device according to claim 1 is characterized in that: One side of the blocking baffle is provided with seepage holes, the area with the seepage holes occupies 1 / 5 to 1 / 3 of the area of ​​the blocking baffle, the diameter of the seepage holes is 5 to 10 mm, and the interval between adjacent seepage holes is 10 to 15 mm; wherein, the upper blocking baffle is 150-200 mm away from the liquid surface, the distance between the two blocking baffles is 100 mm, the seepage hole area of ​​the upper blocking baffle is close to the overflow weir side, and the seepage hole area of ​​the lower blocking baffle is close to the overflow baffle side.

6. The copper electrolytic rich liquid multi-stage oil removal device according to claim 1, characterized in that: The porous seepage plate has a height of 100 mm, a buffer zone is provided between the porous seepage plate and the bottom outlet, and the porous seepage plate is 100 mm away from the bottom outlet; The seepage holes on the porous seepage plate have a diameter of 5-10 mm, and the interval between adjacent seepage holes is 10-15 mm.

7. The copper electrolytic rich liquid multi-stage oil removal device according to claim 1, characterized in that: The fiber balls are filled between the two layers of barrier baffles and between the lower barrier baffle and the porous seepage plate. The fiber balls are polyester, polypropylene or acrylic fiber adsorption balls, and the diameter of the fiber balls is 20-30 mm.

8. The application method of the copper electrolytic rich liquid multi-stage oil removal device according to claim 1 is characterized in that: The steps include: S1. Add qualified electro-enriched liquid into the adsorption and degreasing zone and buffer zone of the degreasing tank, and introduce the qualified electro-enriched liquid into the micro-nano bubble generator as a liquid phase medium through a pump; S2. Add the oil-containing electrolyte-rich liquid after stripping to the flotation deoiling zone of the deoiling tank, turn on the micro-nano bubble generator to perform micro-nano flotation deoiling, and continuously feed the oil-containing electrolyte-rich liquid as raw material above the deoiling tank; S3, micro-nano bubbles adsorb the oil droplets in the oil-containing electro-rich liquid and float them to the top of the electro-rich liquid and gradually gather. When the thickness of the oil layer reaches 20-30 mm, the liquid level plate, feeding speed, and bottom discharge flow rate are adjusted to increase the liquid level in the tank, and the scum is discharged from the overflow weir of the de-oiling tank; S4. After flotation oil removal is completed, the electro-rich liquid passes through the blocking baffle and enters the adsorption oil removal area filled with fiber balls for deep oil removal. After the oil removal, a part of the electro-rich liquid returns to the micro-nano bubble generator through the bottom outlet 1 as a liquid medium, and the remaining part is discharged from the system through the bottom outlet 2 to enter the electrolytic deposition operation.

9. The application method of the copper electrolytic rich liquid multi-stage oil removal device according to claim 8, characterized in that: The oil content in the qualified electro-rich solution in step S1 is less than 10 ppm; The oil-containing electro-rich liquid in step S2 is obtained by stripping, and the oil content is above 40 ppm. The flow rate fed into the oil removal tank is 0.5-1.0 m 3 / h.

10. The application method of the copper electrolytic rich liquid multi-stage oil removal device according to claim 8, characterized in that: The discharge flow rate of the electro-rich liquid after oil removal obtained in step S4 is 0.5-1.0 m 3 / h, the copper content in the electro-rich solution is not affected, and the oil content in the electro-rich solution is reduced to below 5 ppm.

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