JP5309536B2 - Method and apparatus for recovering nickel from nickel-containing aqueous solution - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a new method and an apparatus for recovering nickel from nickel-containing aqueous solution with which the nickel can efficiently be recovered from the used plating solution and the recovered nickel can be reused. <P>SOLUTION: This apparatus is provided with; a dissolving aqueous vessel 31 for mixing triazine thiol sodium in the nickel-containing aqueous solution; a reaction aqueous vessel 2 for precipitating the triazine thiol nickel by adjusting the hydrogen ion concentration in the nickel-containing aqueous solution mixing the triazine thiol sodium in the dissolving aqueous vessel 31; a precipitation aqueous vessel 6 for separating the triazine thiol nickel precipitated in the reaction aqueous vessel 2 by adsorbing to a magnetic field; and a magnetic field generating means 7 for generating the magnetic field for adsorbing the triazine thiol nickel in the precipitation aqueous vessel 6. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a method and apparatus for recovering nickel from a nickel-containing aqueous solution, and more particularly, to a method and apparatus for efficiently extracting and recovering nickel from electroless nickel plating and electrolytic nickel plating waste liquid.

  Electroless nickel plating solution used for surface treatment of electronic parts, precision machine parts, etc. is composed of nickel sulfate as a nickel supply source, sodium hypophosphite as a reducing agent, and complexing agents such as lactic acid and citric acid. . In the plating process, sodium hypophosphite is oxidized to sodium phosphite, and nickel is consumed along with it. Therefore, nickel sulfate, sodium hypophosphite, and sodium hydroxide are added as pH regulators as needed. . However, during repeated use of the plating solution, sulfate ions, sodium ions, phosphite ions, zinc and iron eluted from the surface of the object to be plated can accumulate in the plating solution and maintain the quality of the plating film. Since it becomes difficult, the plating solution used to some extent is disposed of as a waste solution. From the viewpoint of environmental protection and resource protection in recent years, development of a method for reusing used plating solutions is expected.

  Therefore, as a method for reusing a used electroless nickel plating solution, for example, a method for preparing an electroless nickel replenisher from a waste solution using a nickel extractant such as 2-hydroxy-5-nonylacetophenone oxime is disclosed. (See Patent Document 1). However, when the above method is applied to an industrial scale continuous extraction device, a multistage extraction device, or the like, nickel cannot be efficiently recovered due to a low nickel extraction rate.

  In order to solve the above problems, a method for efficiently extracting and recovering nickel from a nickel-containing aqueous solution has been disclosed (see Patent Document 2). This method is characterized in that an organic solvent containing a β-hydroxyoxime-based extractant and an acidic organic phosphorus compound is brought into contact with a nickel-containing aqueous solution to extract nickel into the organic solvent phase. However, this method has a social problem that a large cost is required for the use or disposal of the organic solvent and an environmental load is imposed upon the disposal.

  As another prior art, a method is disclosed in which nickel ions are reacted with a chelate resin and removed by adsorption precipitation, and then nickel is eluted with an acid and recovered (Patent Document 3). However, this method uses a reaction flocculation water tank for the reaction, and a large water tank is required for collecting the precipitate, and the time required for the sedimentation separation is long, so that the process takes time and cost. there were.

  Moreover, the method of making alkaline by adding slaked lime containing calcium, etc., changing the dissolved nickel into insoluble nickel hydroxide, and filtering the precipitate is disclosed (Patent Document 4). However, this method has a problem that, in addition to the time and cost required for filtration of the precipitate, treatment chemicals such as slaked lime are required, and all of these are wastes that cannot be reused.

  Further, a method is disclosed in which a precipitation accelerator such as palladium is added to a plating waste solution to form a metallic nickel precipitate, which is filtered and solidified by a filter press (Patent Document 5). In this method, the nature of the precipitated precipitate is good, but there is a problem that a large equipment cost and space are required for the solidification step of the precipitate such as a filter press.

Furthermore, a method is disclosed in which nickel in the plating solution is deposited directly on the electrode surface by electrolysis using a copper electrode (Patent Document 6). Although this method is considered to be highly effective in recovering nickel, there is a problem in that a large amount of power is required for nickel deposition, resulting in large-scale equipment and high costs.
Japanese Patent Laid-Open No. 2001-192846 JP 2004-307983 A JP 11-226596 A Japanese Patent Application Laid-Open No. 10-066998 JP-A-10-180266 JP-A-11-124679

  Therefore, the present invention is a method capable of efficiently recovering nickel from a used plating solution and reusing the recovered nickel, has a low environmental load, does not require a large-scale apparatus, and Another object of the present invention is to provide a novel method for recovering nickel from a nickel-containing aqueous solution that can recover nickel at a low cost in a short time. Furthermore, it aims at providing the apparatus for it.

  In order to solve the above-mentioned problems, the inventors have conducted intensive studies and found that, when triazine thiol sodium is added to a nickel plating waste solution, the precipitation of triazine thiol nickel produced is weak but magnetic. The inventors have found that the precipitate can be adsorbed and separated by a superconducting bulk magnet that generates a magnetic field of 3T (Tesla), and arrived at the present invention.

  That is, the method for recovering nickel from the nickel-containing aqueous solution of the present invention adjusts the hydrogen ion concentration of the mixing step of mixing triazine thiol sodium with the nickel-containing aqueous solution and the nickel-containing aqueous solution in which triazine thiol sodium is mixed in this mixing step. And a separation step of separating the triazine thiol nickel deposited in this precipitation step by adsorbing it to a magnetic field.

  In the separation step, the strength of the magnetic field for adsorbing triazine thiol nickel is 3T or more.

  Furthermore, a magnetic powder is added in the precipitation step or the separation step.

  The apparatus for recovering nickel from the nickel-containing aqueous solution according to the present invention comprises adjusting the hydrogen ion concentration of a dissolved water tank in which triazine thiol sodium is mixed with the nickel-containing aqueous solution and the nickel-containing aqueous solution in which triazine thiol sodium is mixed in the dissolved water tank. A reaction water tank for precipitating triazine thiol nickel, a precipitation water tank for adsorbing and separating the triazine thiol nickel precipitated in the reaction water tank, and a magnetic field generating means for generating a magnetic field for adsorbing triazine thiol nickel in the precipitation water tank. It is characterized by having.

  The magnetic field generating means is a superconducting bulk magnet.

  The magnetic field generating means is a superconducting solenoid magnet or an electromagnet.

  Further, the magnetic field generating means is a permanent magnet.

  Further, a magnetic mesh is arranged in the vicinity of the magnetic field generating means in the settling tank.

  Furthermore, a disk provided with a permanent magnet is disposed in the vicinity of the magnetic field generating means in the settling tank, and the disk is configured to be rotatable.

  According to the method for recovering nickel from the nickel-containing aqueous solution of the present invention, triazine thiol nickel is adsorbed to a magnetic field, so that a large-scale apparatus is not required and nickel can be efficiently recovered in a short time and at low cost. Can do.

  Further, by setting the strength of the magnetic field to 3T or more, triazine thiol nickel can be reliably adsorbed at a high speed.

  Furthermore, by adding magnetic powder, the sedimentation rate of triazine thiol nickel can be greatly increased, and the separation efficiency can be improved.

  According to the apparatus for recovering nickel from the nickel-containing aqueous solution of the present invention, triazine thiol nickel is adsorbed to a magnetic field, so that a large-scale apparatus is not required and nickel can be efficiently recovered in a short time and at low cost. Can do.

  In addition, since the magnetic field generating means is a superconducting bulk magnet, triazine thiol nickel can be efficiently adsorbed by the strong magnetic field and steep magnetic gradient of the bulk magnet, and the magnetic field generating means can be configured compactly. Can do.

  In addition, since the magnetic field generating means is a superconducting solenoid magnet, a large amount of triazine thiol nickel can be efficiently adsorbed by the strong magnetic field generated in a large space, and the magnetic field can be rapidly changed by being an electromagnet. Change of magnetic field, alternating magnetic field, and pulsed magnetic field, and the application range can be expanded and versatility can be improved.

  Further, since the magnetic field generating means is a permanent magnet, the apparatus can be simplified and the apparatus can be configured on a small scale at a low cost.

  Further, by providing a magnetic mesh in the vicinity of the magnetic field generating means, a steep magnetic field is generated by magnetizing the magnetic mesh, and the separation efficiency of triazine thiol nickel can be increased.

  Further, a disk having a permanent magnet is arranged in the vicinity of the magnetic field generating means, and by rotating the disk, the triazine thiol nickel adsorbed by the magnetic field generating means is adsorbed and separated by the permanent magnet of the disk. be able to.

  Nickel reactively adsorbed on triazine thiol is separated from the washing waste liquid by hydrolysis and reused as a plating solution, while triazine thiol is also reused. This cycle enables water purification and reuse systems with low costs and low waste.

  The method for recovering nickel from the nickel-containing aqueous solution of the present invention comprises mixing a nickel-containing aqueous solution with triazine thiol sodium and adjusting the hydrogen ion concentration of the nickel-containing aqueous solution in which triazine thiol sodium is mixed in this mixing step. A precipitation step of depositing triazine thiol nickel; and a separation step of separating the triazine thiol nickel deposited in this precipitation step by adsorbing it to a magnetic field.

  The nickel-containing aqueous solution is not limited to the electroless nickel plating solution, and an electrolytic nickel plating solution and other nickel-containing aqueous solutions can be used. Moreover, the nickel containing aqueous solution containing the precipitation of organic substance and inorganic substance can also be used. Further, a cleaning waste liquid containing dilute nickel ions that is produced after cleaning a processed product immediately after nickel plating can be used.

  In the mixing step, triazine thiol sodium is mixed into the nickel-containing aqueous solution.

  In the precipitation step, triazine thiol nickel is precipitated by adjusting the hydrogen ion concentration of the nickel-containing aqueous solution mixed with the triazine thiol sodium aqueous solution in the mixing step. Since the nickel-containing aqueous solution is acidic when it is an electroless nickel plating solution, triazine thiol nickel can be precipitated by adding sodium hydroxide or the like to make it neutral. Moreover, in order to control the precipitation rate of triazine thiol nickel, the temperature of the nickel-containing aqueous solution may be managed.

  In the separation step, the triazine thiol nickel precipitated in the precipitation step is adsorbed to a magnetic field and separated. By adsorbing triazine thiol nickel to a magnetic field, nickel can be efficiently recovered without requiring a large-scale apparatus and in a short time and at low cost.

  In the separation step, the strength of the magnetic field for adsorbing triazine thiol nickel is preferably 3T or more. By making the intensity of the magnetic field 3T or more, triazine thiol nickel can be reliably adsorbed. As a means for generating such a magnetic field, a superconducting bulk magnet or a superconducting solenoid magnet can be used. Although the adsorption speed does not reach these, an electromagnet generating a 2T class magnetic field or a permanent magnet generating a 1T class magnetic field can be used for this purpose.

  By performing a hydrolysis treatment using sodium hydroxide, nickel is liberated from triazine thiol nickel, and it is acid-treated to be converted to nickel sulfate, so that it can be added to the plating solution and used again. Moreover, about triazine thiol, it can also be set as triazine thiol sodium by processing with alkalis, such as sodium hydroxide, and can be reused in the said mixing process after pH adjustment.

  According to the method for recovering nickel from the nickel-containing aqueous solution of the present invention, nickel can be efficiently recovered without requiring a large-scale apparatus and in a short time and at a low cost. Moreover, the chemical | medical agents to add are only triazine thiol sodium and sodium hydroxide, and the cost concerning chemical | medical agent addition is very low.

  In addition, when waste water that has been processed after plating is washed by the method for recovering nickel from the nickel-containing aqueous solution of the present invention, low-concentration nickel ions contained in the waste water are removed to meet environmental standards. The nickel concentration can be reduced to the concentration.

  Furthermore, by adsorbing triazine thiol nickel with a strong magnetic field, it is possible to improve the sedimentation rate of triazine thiol nickel, shorten the residence time, and reduce the size of the precipitation water tank, thereby greatly omitting the process. In addition, by refinement of critical particle size, reduction of suspended sediment (SS), and purification of supernatant liquid, fine precipitates and weak magnetic precipitates can be effectively agglomerated, improving separation and purification performance and improving throughput (throughput). Can be achieved.

  In addition, you may add a magnetic powder in the said precipitation process or the said isolation | separation process. As the magnetic powder, for example, iron oxide such as magnetite or hematite, or iron can be used. When magnetic powder is added, the magnetic powder and triazine thiol nickel are adsorbed and aggregated by a magnetic field to increase the specific gravity, thereby greatly increasing the sedimentation rate of triazine thiol nickel and improving the separation efficiency. Moreover, since triazine thiol nickel aggregates, suspended solids (SS) can be removed very efficiently.

  At this time, a flocculant can be added to promote the precipitation of triazine thiol nickel and the integration of the magnetic powder, which is effective for the aggregation rate and its efficiency.

  The precipitate of triazine thiol nickel containing magnetic powder can be recovered as magnetic powder and reused by incineration in a furnace. Further, iron oxide or iron as the added magnetic powder can be separated and recovered by centrifugation or re-dissolution of triazine thiol nickel.

  In the following examples, an apparatus for recovering nickel from a nickel-containing aqueous solution of the present invention will be described with reference to the accompanying drawings.

  In FIG. 1 which shows the structure of the collection | recovery apparatus of nickel from the nickel containing aqueous solution of a present Example, 1 is a nickel containing aqueous solution tank so that nickel containing aqueous solution may be supplied from this nickel containing aqueous solution tank 1 to the dissolution water tank 31. It has become.

  The dissolved water tank 31 is provided with a triazine thiol sodium tank 32 for supplying triazine thiol sodium to the dissolved water tank 31. Then, after triazine thiol sodium is dissolved in the dissolving water tank 31, the nickel-containing aqueous solution is supplied to the reaction water tank 2.

  In the reaction water tank 2, a sodium hydroxide aqueous solution tank 3 for supplying a sodium hydroxide aqueous solution for adjusting the hydrogen ion concentration in the reaction water tank 2 to the reaction water tank 2 and a nickel-containing aqueous solution in the reaction water tank 2 are stirred. A stirring means 4 for heating and a heating means 5 for heating the aqueous solution in the reaction water tank 2 are provided. The nickel-containing aqueous solution in which triazine thiol nickel is precipitated by adjusting the hydrogen ion concentration in the reaction water tank 2 is supplied to the precipitation water tank 6.

  The precipitation water tank 6 has a magnetic field generating means 7 for generating a magnetic field for adsorbing the precipitate of triazine thiol nickel deposited on the bottom thereof, and a pipe for separating the triazine thiol nickel adsorbed on the magnetic field of the magnetic field generating means 7. 8 is provided. In addition, a pipe 9 for separating the supernatant liquid is provided in the upper part of the precipitation water tank 6. In addition, 8a and 9a are valves provided in the pipes 8 and 9, respectively.

  The magnetic field generating means 7 is preferably one that can generate a magnetic field of 3T or more in order to reliably adsorb triazine thiol nickel, and is any of a superconducting bulk magnet, a superconducting solenoid magnet, an electromagnet, and a permanent magnet. Can be configured.

  Next, with respect to the method of recovering nickel using the nickel recovery apparatus from the nickel-containing aqueous solution of this example, an example of using a nickel-phosphorous plating waste liquid called Kanisen plating or amorphous nickel plating as the nickel-containing aqueous solution is an example. I will explain to you.

  First, the plating waste liquid is supplied from the nickel-containing aqueous solution tank 1 to the dissolving water tank 31, and the triazine thiol sodium is added to the dissolving water tank 31 from the triazine thiol sodium aqueous solution tank 32 and dissolved.

  Next, the plating waste liquid is supplied from the dissolution water tank 31 to the reaction water tank 2. Then, the sodium hydroxide aqueous solution is added from the sodium hydroxide aqueous solution tank 3 to the reaction water tank 2 while being stirred by the stirring means 4 and, if necessary, heated by the heating means 5. And triazine thiol nickel precipitates by adjusting the hydrogen ion density | concentration which is about pH 4.8 initially to the value close | similar to pH 7 (neutral). The nickel-containing aqueous solution in which triazine thiol nickel is deposited is supplied to the precipitation water tank 6.

  In the precipitation water tank 6, the precipitated triazine thiol nickel precipitate is attracted by the magnetic field generated by the magnetic field generation means 7 and quickly settles. Then, the precipitate A aggregated at the bottom of the settling tank 6 is separated by being extracted from the pipe 8 through the valve 8a. Moreover, the supernatant liquid of the precipitation water tank 6 is extracted from the piping 9 through the valve 9a. In addition, in order to smoothly discharge the precipitate A without clogging the pipe 8, in addition to a method of discharging by water pressure due to gravity, a method of sucking by reducing pressure and a method of pumping by a pump installed in a part of the pipe are used May be.

  Further, in the reaction water tank 2 or the precipitation water tank 6, for example, magnetic powder such as iron oxide such as magnetite or hematite or iron may be added to the precipitation A of triazine thiol nickel. By adding magnetic powder, the sedimentation rate of triazine thiol nickel is greatly increased, and the separation efficiency is improved.

  As described above, the apparatus for recovering nickel from the nickel-containing aqueous solution of the present example includes a dissolved water tank 31 in which triazine thiol sodium is mixed in the nickel-containing aqueous solution, and a nickel-containing aqueous solution in which triazine thiol sodium is mixed in the dissolved water tank 31. A reaction water tank 2 for precipitating triazine thiol nickel by adjusting the hydrogen ion concentration, a precipitation water tank 6 for adsorbing and separating the triazine thiol nickel deposited in the reaction water tank 2 by a magnetic field, and triazine thiol nickel in the precipitation water tank 6 And a magnetic field generation means 7 for generating a magnetic field for adsorbing.

  Therefore, by adsorbing triazine thiol nickel to a magnetic field, nickel can be efficiently recovered without requiring a large-scale apparatus and in a short time and at low cost. Further, a separation material such as a filter is not required for separation of triazine thiol nickel, and triazine thiol nickel can be separated by continuous treatment. In addition, the magnetic field generating means is versatile, and a superconducting bulk magnet, a superconducting solenoid magnet, an electromagnet, or a permanent magnet can be selected depending on the scale and purpose of separation.

  Further, if a plurality of precipitation water tanks and magnetic field generating means are arranged in series in a multistage manner, higher separation efficiency can be easily obtained. Therefore, it can be used for the purification of nickel-containing wastewater.

  Triazine thiol forms a salt with iron and cobalt in addition to nickel, and these salts have weak magnetism. Therefore, the present invention can also be used for separation of iron and cobalt.

  An apparatus for recovering nickel from the nickel-containing aqueous solution of this example will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the part similar to the said Example 1, and the detailed description is abbreviate | omitted.

  In this embodiment, the magnetic field generating means is composed of a superconducting bulk magnet. Reference numeral 10 denotes a superconducting bulk magnet as a magnetic field generating means, and a superconducting bulk material 11 as a magnetic pole is disposed close to the outside of the bottom surface of the settling tank 6. A cooling unit 12 is in contact with the superconducting bulk material 11, the cooling unit 12 is cooled by a refrigerator 13, and the superconducting bulk material 11 is further cooled by the cooling unit 12. Further, the bulk material 11 and the cooling unit 12 are accommodated in a vacuum vessel, and heat from the outside is cut off so that the bulk material 11 is maintained in a superconducting state. The bulk material 11 is excited in the superconducting state to generate a magnetic field. In addition, the superconducting bulk magnet 10 includes a vacuum pump, a compressor, and an excitation device, which are not shown.

  As described above, in the apparatus for recovering nickel from the nickel-containing aqueous solution of this example, the magnetic field generating means is the superconducting bulk magnet 10, and the triazine thiol nickel is efficiently obtained by the strong magnetic field and steep magnetic gradient of the bulk magnet. Can be adsorbed and the magnetic field generating means can be made compact.

  The apparatus for recovering nickel from the nickel-containing aqueous solution of this example will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the part similar to the said Example 1, and the detailed description is abbreviate | omitted.

  In this embodiment, the magnetic field generating means is composed of a superconducting solenoid magnet. Reference numeral 14 denotes a superconducting solenoid magnet as a magnetic field generating means, and a magnetic pole is disposed close to the outside of the bottom surface of the settling tank 6. A pipe 8 is passed through the central bore 15 of the superconducting solenoid magnet 14.

  As described above, in the apparatus for recovering nickel from the nickel-containing aqueous solution of the present embodiment, the magnetic field generating means is the superconducting solenoid magnet 14, and a large amount of triazine thiol nickel is efficiently obtained by the strong magnetic field generated in a large space. Can be adsorbed.

  Moreover, it can be set as an electromagnet instead of a superconducting solenoid magnet by the same structure. Since the magnetic field generating means is an electromagnet, the change of the magnetic field can be a rapid magnetic field change, an alternating magnetic field, or a pulsed magnetic field, and the application range can be expanded and versatility can be improved.

  The apparatus for recovering nickel from the nickel-containing aqueous solution of this example will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the part similar to the said Example 1, and the detailed description is abbreviate | omitted.

  In this embodiment, the magnetic field generating means is composed of a permanent magnet. Reference numeral 16 denotes a permanent magnet as a magnetic field generating means, and a magnetic pole is arranged close to the outside of the bottom surface of the settling tank 6. A magnetic mesh 17 is disposed at the bottom inside the sedimentation tank 6. The magnetic mesh 17 is a net made of a relatively coarse magnetic material having an opening of about 0.1 mm to 10 mm. The opening of the pipe 8 is disposed in the vicinity of the magnetic mesh 17.

  As described above, in the nickel recovery apparatus from the nickel-containing aqueous solution of the present embodiment, the magnetic field generating means is the permanent magnet 16, the apparatus can be simplified, and the apparatus can be configured on a small scale at low cost. Can do.

  Further, a magnetic mesh 16 is arranged in the vicinity of the permanent magnet 16 serving as the magnetic field generating means in the settling tank 6, and a steep magnetic field is generated by magnetizing the magnetic mesh 16, and triazine thiol nickel is formed on the magnetic mesh 16. Since the precipitate aggregates, the separation efficiency of triazine thiol nickel can be increased.

  The same effect can be obtained even when spherical or granular magnetic stainless steel or plated iron is disposed in the precipitation water tank 6 instead of the magnetic mesh 17. Further, a magnetic mesh 17 may be added to the configurations of Examples 1 to 3 to increase the separation efficiency of triazine thiol nickel.

  The apparatus for recovering nickel from the nickel-containing aqueous solution of this example will be described with reference to FIGS. 5 and 6 showing the configuration in the vicinity of the precipitation water tank. In addition, the same code | symbol is attached | subjected to the part similar to the said Example 1 and Example 2, and the detailed description is abbreviate | omitted.

  In this embodiment, a disk 22 is arranged upright in the precipitation water tank 6, and the lower part of the disk 22 is immersed in the nickel-containing aqueous solution in the precipitation water tank 6. A plurality of permanent magnets 22 are arranged at equal intervals on a circle centered on the central axis of the disc 21. The disc 21 is configured to be rotatable about its center, and is located on a circle on which the permanent magnet 21 is disposed in the vicinity of a portion of the disc 21 below the surface B of the nickel-containing aqueous solution. In addition, a superconducting bulk magnet 10 is disposed. Further, a scraper 23 for separating the precipitate adsorbed and collected by the disk 21 is provided in contact with the disk 21 above the liquid surface B. Reference numeral 24 denotes a storage tank for storing the precipitate separated from the disk 21 by the scraper 23, and reference numeral 25 denotes a pipe for discharging the supernatant liquid from which the precipitate has been separated.

  Next, the operation will be described. The strong magnetic field applied from the superconducting bulk magnet 11 collects the precipitate A in the settling tank 6. When the disk 21 is rotated, the precipitate A moves on the liquid surface B together with the permanent magnet 22 provided on the disk 21, is separated from the disk 21 by the scraper 23, and is stored in the storage tank 24. The As described above, the precipitate A aggregated in the vicinity of the superconducting bulk magnet 11 is moved together with the permanent magnet 22 in order to keep its position once collected, and is simply continuously led out of the precipitation water tank 6. The Further, since the precipitate A is separated from the disk 21 above the liquid level B, it is recovered as a good sludge with a low water content.

  As described above, the apparatus for recovering nickel from the nickel-containing aqueous solution according to the present embodiment has the disk 21 provided with the permanent magnet 22 in the vicinity of the superconducting bulk magnet 11 as the magnetic field generating means in the precipitation water tank 6. The disc 21 is configured to be rotatable, and the triazine thiol nickel adsorbed by the superconducting bulk magnet 11 can be adsorbed to the permanent magnet 22 of the disc 21 and separated.

  Note that instead of the disc 21, a belt-like shield made of cloth is installed, and this shield is moved on the superconducting bulk magnet 11, so that the precipitate A can be pulled up and separated.

  A triazine thiol sodium aqueous solution was added to a nickel plating solution having a nickel concentration of 0.548% to precipitate and remove triazine thiol nickel. The nickel concentration of the supernatant was 0.166%, which was reduced to the original 30.3%.

2 is a schematic diagram illustrating a configuration of a nickel recovery device from a nickel-containing aqueous solution of Example 1. FIG. 6 is a schematic diagram showing a configuration in the vicinity of a precipitation water tank of Example 2. FIG. 6 is a schematic diagram showing a configuration in the vicinity of a precipitation water tank of Example 3. FIG. FIG. 6 is a schematic diagram showing a configuration in the vicinity of a precipitation water tank of Example 4. It is a side view which shows the structure of the precipitation water tank vicinity of Example 5. FIG. FIG. 6 is a top view showing a configuration in the vicinity of a precipitation water tank of Example 5.

Explanation of symbols

2 Reaction water tank 6 Precipitation water tank 7 Magnetic field generation means
10 Superconducting bulk magnet (magnetic field generating means)
14 Superconducting solenoid magnet (magnetic field generating means)
16 Permanent magnet (magnetic field generating means)
17 Magnetic mesh
21 disc
22 Permanent magnet
31 Dissolving water tank

Claims (9)

In this mixing step, a mixing step of mixing triazine thiol sodium with a nickel-containing aqueous solution, a precipitation step of precipitating triazine thiol nickel by adjusting the hydrogen ion concentration of the nickel-containing aqueous solution mixed with triazine thiol sodium in this mixing step, A method for recovering nickel from a nickel-containing aqueous solution, comprising: a separation step of adsorbing and separating the precipitated triazinethiol nickel in a magnetic field. The method for recovering nickel from a nickel-containing aqueous solution according to claim 1, wherein in the separation step, the strength of the magnetic field for adsorbing triazine thiol nickel is 3T or more. The method for recovering nickel from the nickel-containing aqueous solution according to claim 1 or 2, wherein magnetic powder is added in the precipitation step or the separation step. A dissolution water tank for mixing triazine thiol sodium in a nickel-containing aqueous solution, a reaction water tank for precipitating triazine thiol nickel by adjusting the hydrogen ion concentration of the nickel-containing aqueous solution in which triazine thiol sodium is mixed in this dissolution water tank, A precipitation water tank for adsorbing and separating the precipitated triazine thiol nickel by a magnetic field, and a magnetic field generating means for generating a magnetic field for adsorbing the triazine thiol nickel in the precipitation water tank. Recovery device. The apparatus for recovering nickel from the nickel-containing aqueous solution according to claim 4, wherein the magnetic field generating means is a superconducting bulk magnet. The apparatus for recovering nickel from the nickel-containing aqueous solution according to claim 4, wherein the magnetic field generating means is a superconducting solenoid magnet or an electromagnet. The apparatus for recovering nickel from the nickel-containing aqueous solution according to claim 4, wherein the magnetic field generating means is a permanent magnet. The apparatus for recovering nickel from the nickel-containing aqueous solution according to any one of claims 4 to 7, wherein a magnetic mesh is disposed in the vicinity of the magnetic field generating means in the precipitation water tank. 8. The disk according to claim 4, wherein a disk having a permanent magnet is disposed in the vicinity of the magnetic field generating means in the settling tank, and the disk is configured to be rotatable. An apparatus for recovering nickel from a nickel-containing aqueous solution.

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