JP6988435B2 - How to remove droplets of the aqueous phase contained in the organic phase - Google Patents

Description

The present invention relates to a method for removing fine aqueous phase droplets contained in an organic phase obtained from an extraction stage in which an extraction process using an organic solvent is performed.

In the hydrometallurgical process of recovering the target metal from sulfide, a purification process that removes impurities from the obtained leachate by leaching nickel matte and nickel-cobalt mixed sulfide (MS: mixed sulfide) as raw materials. Then, electric nickel and electric cobalt are recovered in the electrolytic process.

Specifically, for example, as shown in FIG. 1, in the leachate obtained from the leaching step S1, copper is removed in the cementation step S2, and impurities such as iron and arsenic are removed in the iron removal step S3. It is sent to the cobalt solvent extraction step S4. In the cobalt solvent extraction step S4, nickel and cobalt are separated by solvent extraction to obtain a _{nickel chloride solution (NiCl 2} ) and a cobalt chloride solution (CoCl _2). The nickel chloride solution becomes highly pure and is sent to the nickel electrolysis step S6 after the impurities are further removed in the purification step S5. Then, in the nickel electrolysis step S6, electric nickel is produced by electrowinning. On the other hand, the cobalt chloride solution obtained in the cobalt solvent extraction step S4 is sent to the cobalt electrolysis step S8 with high purity after further removing impurities in the liquid purification step S7. Then, in the cobalt electrolysis step S8, electric cobalt is produced by electrowinning.

Here, FIG. 2 is a diagram showing an example of the flow of processing in the cobalt solvent extraction step S4. In FIG. 2, the “broken line” indicates the flow of the organic phase, and the “solid line” indicates the flow of the aqueous phase.

The cobalt solvent extraction step S4 is supplied with the post-treatment liquid from which impurities have been removed through the iron removal step S3 as the extraction starting liquid. The extraction starting liquid is first supplied to the extraction step (extraction stage) S41. In the extraction step S41, cobalt in the extraction starting liquid is extracted into the organic phase. The aqueous phase after extraction is sent to a subsequent step as a nickel chloride solution. Next, the organic phase in the extraction stage is sent to the cleaning step (cleaning stage) S42, and in the cleaning step S42, a small amount of nickel chloride contained in the organic solvent is removed. Next, the organic phase from which nickel chloride has been removed is sent to the back extraction step (reverse washing stage) S43, and in the back extraction step S43, cobalt extracted into the organic solvent with an acidic aqueous solution such as dilute hydrochloric acid is transferred to the aqueous phase side. It is back-extracted to produce a cobalt chloride solution. The produced cobalt chloride solution is sent to a subsequent step, while the organic solvent is repeatedly reused in the extraction step S41.

In the extraction process in the extraction step S41, impurities such as zinc, iron and copper are also extracted into the organic phase together with cobalt. The extracted cobalt is back-extracted into the aqueous phase in the back-extraction step S43, but the impurities are not back-extracted and remain in the organic solvent. However, when the concentration of impurities in the organic solvent increases, there arises a problem that the amount of cobalt extracted in the extraction step S41 decreases or impurities are eluted in the nickel chloride solution or the cobalt chloride solution. Therefore, the organic solvent after the treatment in the back extraction step S43 is sent to the dezincification step S44 to remove impurities such as zinc, iron, and copper.

In the back extraction process in the back extraction step S43, for example, a mixer settler is used, and the supplied organic phase and the acidic aqueous solution (aqueous phase) are brought into contact with each other by stirring with a mixer to convert cobalt in the organic phase into an aqueous phase. It is distributed and then allowed to stand to separate into an organic phase-aqueous phase. As a result, a cobalt chloride solution is obtained as the aqueous phase. Since the organic phase separated by the back extraction treatment contains Zn, Fe, Cu, Ni and the like as described above, these impurity components are removed by adding a neutralizing agent in the dezincification step S44. .. After that, the organic solvent from which impurities have been removed is sent to the activation step S45, an acidic aqueous solution is added, and the extraction step S41 is repeated.

By the way, in the cobalt solvent extraction step S4, as described above, the cleaning step S42 is provided between the extraction step S41 and the back extraction step S43, and is contained in the organic phase supplied from the extraction step S41. The aqueous phase containing the aqueous nickel chloride solution as the main component is removed. The nickel-containing aqueous phase in the organic phase is contained in the form of an entrainment (fine droplets).

The reason why the organic phase extracted in the extraction step S41 contains an aqueous phase is that the oil-water separation in the treatment in the extraction step S41 is insufficient, but in the extraction step S41, the oil-water separation is performed by the specific gravity separation. Therefore, in order to achieve a sufficient oil-water separation, it is necessary to lengthen the residence time in the settler portion in the specific gravity separation process. However, there are economic restrictions on the installation space and processing time, so there is a limit to improving the oil-water separation performance. Therefore, a cleaning step S42 is provided after the extraction step S41 so that the aqueous phase contained in the organic phase as an entrainment is removed from the organic phase. Specifically, in the cleaning step S42, for example, by using a corelesser or the like, the aqueous phase that cannot be completely removed in the extraction step S41 and is contained as an entrainment is removed.

By removing the aqueous phase contained in the organic phase in the cleaning step S42 in this way, most of the nickel-containing aqueous phase in the organic phase can be removed, but it is contained in the organic phase. Depending on the state of the impurity component and the deterioration state of the organic solvent, invisible minute water droplets may be formed and slightly remain in the organic phase after washing. Specifically, even in normal operation, the organic phase after the cleaning step S42 contains about 1 mg / L of nickel, and may remain at a rate of about 6 mg / L due to fluctuations in operating conditions and the like.

Then, when such an organic phase is treated in the back extraction step S43, the cobalt carried in the organic phase is distributed to the aqueous phase by the back extraction treatment, but the back extraction treatment results in a small amount in the organic phase. Nickel derived from the aqueous phase remaining in the water phase is also dispersed in the aqueous phase (cobalt chloride solution) at the same time.

The cobalt chloride solution after the back extraction treatment is supplied to the cobalt electrolytic step S8 via the purification liquid (impurity removal) step S7, but there is no step of removing nickel as an impurity contained in the cobalt chloride solution. In the cobalt electrolysis step S8, nickel having similar electrolytic conditions is electrodeposited at the same time as cobalt, and therefore nickel is mixed in the electric cobalt as an impurity, and as a result, the product standard of the electric cobalt is deviated. There's a problem.

In order to deal with the above-mentioned problems, as shown in FIG. 2, a method of returning the cobalt chloride solution after the back extraction treatment to the washing step S42 again for the washing treatment can be considered, but the treatment efficiency may deteriorate. In addition, it is not possible to sufficiently remove invisible fine droplets even after repeated washing.

As a technology for removing fine droplets, a technology such as a corelesser or a demister that captures fine droplets, grows them, coarsens them, and separates them in a state where they can be separated by specific gravity is widely known, and related devices are also commercially available. ing. However, the technique for removing fine particles of the organic phase mixed in the aqueous phase to an unknown degree by eye is not known, and the technique applicable to the fine oil (organic phase) droplets in the cobalt chloride solution is known. Not done.

Further, for example, Patent Document 1 discloses a technique for removing an oil phase in an aqueous phase, but the above-mentioned device is intended for so-called drainage and is a relatively large-scale device using an oil adsorbent material. It is difficult to apply to the problem. Further, Patent Document 2 also discloses a technique for removing the oil phase in the aqueous phase, which is a technique applied when the viscosity of the oil phase is very high such as pitch and tar, and is a treatment. It is also difficult to apply because it is a relatively large-scale device that requires a flow path that defines the flow direction of the target oil-water mixture. Further, Patent Document 3 discloses a technique for removing mist (fine droplets of water vapor) in order to maintain a suitable water balance in a dechlorination facility, but removes a liquid phase from the gas phase. It is a technology to do.

Japanese Unexamined Patent Publication No. 5-5060 International Publication No. 2011/71113 Japanese Unexamined Patent Publication No. 2017-48436

The present invention has been proposed in view of such circumstances, and effectively and efficiently removes fine droplets of an aqueous phase contained in an organic phase after an extraction treatment using an organic solvent. The purpose is to provide a method that can be used.

The present inventor has made extensive studies to solve the above-mentioned problems. As a result, the organic phase obtained from the extraction stage that performs the extraction process using the organic solvent is passed through a pipe filled with pulp to remove fine droplets of the aqueous phase contained in the organic phase. We have found that it can be effectively removed, and have completed the present invention.

(1) The first invention of the present invention is a method for removing droplets of an aqueous phase contained in an organic phase obtained from an extraction stage in which an extraction process using an organic solvent is performed. It is a method of passing liquid through a pipe filled with pulp.

(2) In the second invention of the present invention, in the first invention, the extraction stage, the cleaning stage for cleaning the organic phase obtained from the extraction stage, and the back extraction treatment for the organic phase after cleaning are performed. In the solvent extraction method including the three treatments with the back extraction stage, the organic phase after cleaning in the washing stage is passed through a pipe filled with the pulp.

(3) The third aspect of the present invention is the method in which the pipe is a pipe for supplying an organic phase from the washing stage to the back extraction stage in the second invention.

(4) The fourth invention of the present invention is the method in any one of the first to third inventions, wherein the pulp filled in the pipe has an average fiber length of 1 mm to 5 mm.

(5) Fifth aspect of the present invention, in any of the first to fourth, the pulp may be filled with a packing density ^{410mg / mm 3 ~450mg / mm 3} , it is a method.

(6) The sixth invention of the present invention is the method in which the pulp is a dry natural pulp in any one of the first to fifth inventions.

(7) In the seventh invention of the present invention, in any one of the first to sixth inventions, in the solvent extraction method, a nickel chloride solution containing cobalt is used as an extraction starting solution, and the cobalt is extracted with a solvent. It is a method of obtaining a cobalt chloride solution, and is a method of removing droplets of an aqueous phase containing nickel contained in the organic phase containing cobalt.

(8) In the eighth aspect of the present invention, the extraction stage for performing an extraction process using an organic solvent, the cleaning stage for cleaning the organic phase obtained from the extraction stage, and the opposite to the organic phase after cleaning. A solvent extraction device including a back extraction stage for performing an extraction process, wherein the cleaning stage and the back extraction stage are connected by a pipe for supplying an organic phase after cleaning in the cleaning stage. It is a solvent extractor filled with pulp in the middle of piping.

(9) A ninth aspect of the present invention is the solvent extraction device according to the eighth aspect, wherein the pipe is branched into two or more flow paths, and each of the branched pipes is filled with the pulp. be.

According to the present invention, it is possible to effectively and efficiently remove fine droplets of the aqueous phase contained in the organic phase after the extraction treatment using the organic solvent.

It is a figure which shows an example of the flow of the wet smelting process. It is a figure which shows an example of the flow of a process in a cobalt solvent extraction process. It is an overview photograph figure of the pipe filled with pulp used in Example 1. FIG.

Hereinafter, specific embodiments of the present invention will be described in detail. The present invention is not limited to the following embodiments, and various modifications can be made without changing the gist of the present invention.

The present invention is a method for removing droplets (impurity components) of an aqueous phase contained in an organic phase obtained from an extraction stage in which an extraction process using an organic solvent is performed. More specifically, for example, there are three treatments: an extraction stage, a cleaning stage for cleaning the organic phase obtained from the extraction stage, and a back extraction stage for performing a back extraction treatment on the cleaned organic phase. This is a method for removing the aqueous phase contained in the organic phase after washing in the washing stage in the solvent extraction method containing the above.

For example, in the process of producing a cobalt chloride solution, a countercurrent multi-stage extraction device is used to extract cobalt from a cobalt-containing nickel chloride solution with an organic solvent consisting of an extractant and a diluent. Manufactures cobalt solution. In this production process, the organic phase containing cobalt extracted by the organic solvent is transferred to a washing stage and subjected to a washing treatment to remove nickel which is a so-called impurity component contained in the organic phase. Then, the organic phase after washing is transferred to the backwashing stage and brought into contact with a back extract such as an acidic solution to desorb cobalt into the aqueous phase to produce a cobalt chloride solution.

In this production process, by performing a cleaning treatment on the organic phase after the extraction treatment in the extraction stage in the cleaning stage, the aqueous phase containing nickel contained in the organic phase is almost removed. Invisible fine aqueous phase droplets (entrations) may remain unremoved.

In the present invention, the organic phase containing fine aqueous phase droplets obtained by the extraction process in the extraction stage, which is generated in such a manufacturing process, is passed through a pipe filled with pulp in the middle of the pipe. It is characterized by making it liquid.

By such a treatment, droplets of an invisible fine aqueous phase contained in the organic phase can be effectively removed. In addition, since it can be processed by a simple method of filling pulp in the middle of a predetermined pipe, there are no special restrictions on processing cost or equipment installation space such as installing a large device, and processing is economically efficient. can do.

Note that FIG. 3 is a photographic view showing a state when pulp is filled in the middle of the pipe. In the present invention, the organic phase containing fine aqueous phase droplets is passed through a pipe filled with such pulp.

The present inventor presumes the reason why fine droplets of the aqueous phase can be effectively removed by passing the organic phase through the pulp as follows. That is, when the organic phase mixed with fine droplets (water droplets) is brought into contact with the pulp, the water droplets adhere to the fibers of the pulp or the flow velocity decreases. Then, with the continuous liquid passage of the organic phase, another water droplet comes into contact with the water droplet adhering to the fiber or having a reduced flow velocity, and the water droplet gradually becomes coarse and the separability from the organic phase is improved. As a result, it is conceivable that the aqueous phase is removed from the organic phase.

Here, as the organic phase containing fine droplets of the aqueous phase, the extraction stage, the cleaning stage for cleaning the organic phase obtained from the extraction stage, and the reverse extraction treatment for the organic phase after cleaning are performed. It is preferably the organic phase after washing in the washing stage in the solvent extraction method including the three treatments in the extraction stage.

As described above, in the solvent extraction method including the three treatments of the extraction stage, the washing stage, and the back extraction stage, in the washing stage, the cleaning liquid is used for the organic phase obtained by the extraction treatment with the organic solvent in the extraction stage. The relatively large aqueous phase contained in the organic phase is removed by contacting the organic phase. In this way, by passing the organic phase from which the large aqueous phase droplets have been removed in the washing stage through the pulp, the coarsening of the droplets adhering to the pulp is likely to proceed, and more effectively. Fine aqueous phase droplets can be removed.

The pipe for filling the pulp is not particularly limited, but is preferably a process pipe before back-extracting the components of the aqueous phase contained in the organic phase into the organic phase. Among them, it is preferable that the pipe connects the cleaning stage and the back extraction stage and supplies the organic phase after cleaning in the cleaning stage to the back extraction stage. As described above, the pipe that supplies the organic phase from the washing stage to the back extraction stage is a pipe in which the organic phase after cleaning is sent to the back extraction stage, and pulp is filled in the middle of the pipe. By passing the organic phase containing the droplets of the aqueous phase, it can be effectively removed without inhibiting the growth of the droplets.

As the pulp, known fibrous pulp may be used as long as it has an action of effectively adhering fine droplets of the aqueous phase contained in the organic phase or removing them by reducing the flow velocity. The size thereof is preferably adjusted appropriately according to the liquid passing speed of the organic phase through which the pulp is filled in the pipe, but the average fiber length is preferably 1 mm to 5 mm and 1 mm. It is more preferably ~ 2 mm.

Further, the pulp may be a natural pulp or a synthetic pulp, and a natural pulp and a synthetic pulp may be used in combination. Specifically, examples of natural pulp include wood pulp, chemical pulp, mechanical pulp, and pulp obtained from sisal hemp, Manila hemp, sugar cane, cotton, silk, bamboo, and kenaf. Further, as the synthetic pulp, for example, one made of a thermoplastic resin such as polyethylene, modified polyethylene, polypropylene or the like can be used.

Among these pulps, cotton pulp (cotton linter pulp) having a low ash content such as lignin and an inorganic content is particularly preferable. Since the pulp is low in ash and inorganic content, it is less likely that impurities will elute into the organic phase that has passed through the piping filled with the pulp, and it is possible to prevent impurities from being mixed into the organic phase. Can be done. Further, since the cotton linter pulp containing a small amount of components such as lignin showing hydrophobicity, fine droplets of the aqueous phase contained in the organic phase can be adhered more efficiently.

The water content of the pulp is not particularly limited, and for example, about 5% by mass to 50% by mass can be used.

As the pulp, a commercially available pulp having a predetermined size can be used. Further, the average fiber length can be measured by an optical method such as a polarization method.

In filling the pulp to the pipe is not particularly limited, preferably filled to fill density is ^{410mg / mm 3 ~450mg / mm 3} . By filling the pulp with such a filling density, fine droplets can be more effectively attached to the pulp having an average fiber length of, for example, about 1 mm to 5 mm.

The filling height when the pulp is filled in the pipe is not particularly limited, but it is preferable that the filling height is 1.5 to 3 times the cross-sectional diameter of the pipe. The cross-sectional diameter of the pipe means the inner diameter of the pipe.

The number of pipes to be installed is not particularly limited, but it is preferable to install a plurality of pipes in parallel, and it is preferable to set a switching valve or the like so that the pipes to be used can be adjusted as appropriate. Further, instead of using a plurality of pipes, only one part of the pipe may be branched into two or more flow paths. When a branch pipe is used, each of the branched pipes is filled with pulp. Further, even when a branch pipe is used, it is preferable to provide a switching valve or the like at the branch portion of the pipe so that the liquid passage route of the organic phase can be switched.

In this way, by using a pipe that secures two or more flow paths, it is not necessary to stop the entire device even during maintenance such as pulp replacement work, and continuous and stable operation is possible.

The amount of liquid to be passed through the organic phase is not particularly limited, and it is preferable to appropriately adjust the amount according to the filling capacity of the pulp filled in the pipe, the particle size of the filled pulp, and the like. The flow rate is preferably in the range of about BV300, and more preferably in the range of BV100 to BV200.

The temperature at which the organic phase is passed through the pulp is not particularly limited, but the temperature of the organic phase is preferably in the range of about 45 ° C. to 55 ° C. By passing the organic phase in such a temperature range, the liquid can be passed with appropriate fluidity. In addition, it is not necessary to perform any special heating or cooling operation, and the processing can be performed efficiently.

Here, the method according to the present invention is not particularly limited, but is suitable as a treatment in a production process (solvent extraction method) in which a cobalt chloride-containing nickel chloride solution is used as an extraction starting solution and cobalt is extracted with a solvent to obtain a cobalt chloride solution. Can be applied to. More specifically, it is applied to a method for removing droplets of a nickel-containing aqueous phase contained in a cobalt-containing organic phase obtained from an extraction stage in a solvent extraction method for obtaining this cobalt chloride. Can be done. In this case, the aqueous phase contained in the organic phase is a solution containing nickel.

In the solvent extraction method for obtaining the cobalt chloride solution, an amine-based extractant such as TNOA (Tri-n-octylamine) is preferably used as the extractant contained in the organic solvent used in the extraction stage. In the method according to the present invention, that is, the method for removing fine aqueous phase droplets from an organic phase, fine aqueous phase droplets contained in an organic phase containing an amine-based extractant are more effectively removed. Can be done.

When the aqueous phase is removed from the organic phase by the above-mentioned method, if the removed aqueous phase occupies a certain volume, the organic phase is observed as droplets of visible size in the aqueous phase. Sometimes. In such a case, as in a known oil-water separation device, a space for drain discharge may be provided below the branch of the pipe to prevent the organic phase from flowing out.

Hereinafter, examples of the present invention will be described in more detail, but the present invention is not limited to the following examples.

Cobalt is contained in an organic solvent in which TNOA (Farmin T-08, manufactured by Kao Corporation) as an extractant and Swazole N1800 (manufactured by Maruzen Petrochemical Co., Ltd.) as a diluent are mixed at a ratio of 20:80. Cobalt was extracted from the nickel chloride solution. Then, it was sent from the extraction stage to the washing stage for washing the organic phase, and washed with a cobalt chloride solution as a washing liquid.

In this example, a treatment was performed to remove fine droplets of the aqueous phase contained in the organic phase after washing obtained from the washing stage.

Table 1 below shows the analytical values (measured by an ICP emission spectrophotometer) of the nickel and cobalt contents contained in the organic phase after washing. As shown in Table 1, droplets of the aqueous phase containing nickel were contained at a nickel concentration of about 147 mg / L. If no problem occurs, the nickel concentration in the organic phase after washing is 1 mg / L or less. Considering the influence of nickel content in the subsequent process, the nickel concentration in the organic phase needs to be 6 mg / L or less, and it is necessary to remove the aqueous phase containing nickel with a removal rate of about 96% or more. ..

Specifically, in the operation of removing the droplets of the aqueous phase from the organic phase, pulp is filled in the middle of the glass pipe (inner diameter 10 mm) that supplies the organic phase after cleaning from the cleaning stage to the reverse extraction stage, and is fine. An organic phase containing droplets of the aqueous phase (organic phase after cleaning) was passed through the pipe. Here, in Example 1, pulp having an average fiber length of 1 mm to 2 mm (cotton linter pulp manufactured by Toyo Filter Paper Co., Ltd.) was used to fill the pipe.

When filling the pulp, the glass pipe was heated to about 50 ° C. by circulating hot water with a roller pump, and then the pulp was filled in the pipe so ^{that the filling density was 430 mg / mm 3.} At the time of filling, the filling height was adjusted by pressing the pulp with a rod so that the filling density became a predetermined value. The pulp filling height was set to 20 mm, which is twice the cross-sectional diameter (inner diameter) of the pipe.

When passing the organic phase, the organic phase is preheated to about 50 ° C., and the organic phase is kept in the glass pipe until the height becomes 22 cm (20 cm excluding the pulp that is the filling in the pipe). I charged it. After that, the filtration pump was operated, the cock provided at the bottom of the glass pipe was opened, and the liquid passing process was started. After passing the liquid through the pipe, the organic phase was recovered.

Table 2 below shows the analysis results of the nickel content in the organic phase obtained after passing the organic phase through a pipe filled with pulp. Table 3 below shows the measurement results of the removal rate of nickel (aqueous phase) from the organic phase. "BV" refers to a magnification of the amount of liquid to be treated (organic phase) with respect to the filling. For example, in the case of BV100, the liquid passing treatment is repeated 10 times, and the liquid to be treated is passed 100 times with respect to the filling capacity of the filling. It means that it was made to liquid. A "-" in the table indicates that the test was not performed.

As a comparison, Comparative Example 1 in which a pipe was filled with zirconia balls having a diameter of 1.0 mm (filling height was 20 mm) and the organic phase was passed through the pipe in the same manner as in Example 1 was carried out. The nickel content of the organic phase after passing the liquid was analyzed, and the nickel removal rate was measured.

3 is an overview photograph of the pulp-filled pipe used in Example 1, FIG. 3A is a photograph showing the state of the organic phase before liquid passage, and FIG. 3B is a photograph of the organic phase. It is a photograph figure which shows the state after passing liquid.

As shown in Table 1, although there are differences depending on the flow rate of the organic phase, the aqueous phase is subjected to a simple treatment of passing the organic phase containing fine droplets of the aqueous phase through a pipe filled with pulp. It was found that the droplets could be effectively removed.

Claims (8)

A method for removing droplets of an aqueous phase contained in an organic phase obtained from an extraction stage in which an extraction process using an organic solvent is performed.
The organic phase includes three treatments of the extraction stage, a washing stage for washing the organic phase obtained from the extraction stage, and a back extraction stage for performing a back extraction treatment on the washed organic phase. in the solvent extraction method, an organic phase after washing with the washing stage, the organic phase, the pulp is passed through the pipe is filled, methods. The method according to claim 1 , wherein the pipe is a pipe that supplies an organic phase from the washing stage to the reverse extraction stage. The method according to claim 1 or 2 , wherein the pulp filled in the pipe has an average fiber length of 1 mm to 5 mm. The pulp A method according to any one of claims 1 to 3 is filled with a packing density ^{410mg / mm 3 ~450mg / mm 3} . The method according to any one of claims 1 to 4 , wherein the pulp is cotton linter pulp. The solvent extraction method is a method in which a nickel chloride solution containing cobalt is used as an extraction starting solution, and the cobalt is extracted with a solvent to obtain a cobalt chloride solution.
The method according to any one of claims 1 to 5 , wherein the droplets of the nickel-containing aqueous phase contained in the cobalt-containing organic phase are removed. A solvent comprising an extraction stage for performing an extraction treatment using an organic solvent, a washing stage for washing the organic phase obtained from the extraction stage, and a back extraction stage for performing a back extraction treatment on the washed organic phase. It ’s an extraction device,
The washing stage and the back extraction stage are connected by a pipe for supplying the organic phase after washing in the washing stage, and pulp is filled in the middle of the pipe .
The solvent extraction device contains nickel contained in a cobalt-containing organic phase in a solvent extraction process in which a cobalt-containing nickel chloride solution is used as an extraction starting solution and the cobalt is extracted with a solvent to obtain a cobalt chloride solution. A solvent extractor used to remove aqueous phase droplets. The pipe is branched into two or more flow paths.
The solvent extraction device according to claim 7 , wherein the pulp is filled in each of the branched pipes.

Images