JP2015160161A - Method and installation for treating salt solution - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for treating a salt solution, which enables a treatment of the salt solution to be conducted continuously and is easy to operate, and to provide an installation for treating the salt solution using the treatment method.SOLUTION: The method for treating a salt solution comprises: an electrification step of obtaining positively charged conductive particles and at the same time negatively charged conductive particles from conductive particles by using a slurry of conductive particles; an adsorption step where ions are adsorbed by both of the particles, including an anion adsorption step of obtaining conductive particles having anions adsorbed and a cation adsorption step of obtaining conductive particles having cations adsorbed, the two steps being conducted in order; and an ion separation step where a slurry containing the conductive particles having anions adsorbed and a slurry containing the conductive particles having cations adsorbed are mixed to neutralize the negatively charged conductive ions and the positively charged conductive ions and, at the same time, make the cations and anions which are in adsorbed states are desorbed from the conductive particles, and separating the desorbed ions from the slurry containing the conductive particles.

Description

  The present invention relates to a treatment method and treatment equipment for electrically treating a salt solution in which a salt is dissolved, for example, salt water.

In recent years, a technique has been proposed in which desalting treatment is performed by adsorbing ions in waste water to adsorbents of each electrode by using the cation exchange membrane side as a positive electrode and the anion exchange membrane side as a negative electrode (Patent Document 1). ). As shown schematically in FIG. 3 of the present specification, the technique described in Patent Document 1 uses a cation exchange in a treatment path 30 through which a salt solution to be desalted (described as “target treatment liquid” in the figure) flows. The adsorbent filling portion 32 is provided via the membrane 31a and the anion exchange membrane 31b, and charges are applied to the positive electrode and the negative electrode, thereby filling the predetermined portion 32 with negative ions and positive ions generated by salt decomposition. It can be said that it is a technique of desalting from the salt solution to be treated by adsorbing the adsorbent 33. In this desalting technique, when the adsorbent 33 is saturated with ions, as shown in FIG. 3B, the ions adsorbed on the adsorbent 33 are desorbed and regenerated by reversing the polarity of the electrodes.
Therefore, in the operation state shown in FIG. 3A, a salt dilute solution (denoted as “demineralized solution” in the figure) having a reduced salt concentration from the treatment path 30 can be obtained. When the same salt solution is flowed in the state of FIG. 3B, a salt concentrated solution (described as “concentrated liquid” in the figure) with an increased salt concentration is obtained.
By adopting the technique shown in Patent Document 1, an electricity bill such as a high-pressure specification pump or pump power becomes unnecessary, and a cost reduction can be expected as compared with the RO membrane treatment.

Japanese Patent No. 4135802

  However, in Patent Document 1, it is necessary to switch the electrode polarity during regeneration because, for example, the principle of the technology is the adsorption and desorption of ions to the adsorbent. For example, salt is removed from the salt solution. The desalting treatment to be performed and the recovery of the adsorbent (salt concentration to obtain a solution having a high salt concentration when viewed from the salt side) cannot be performed simultaneously. Furthermore, since the treatment is a so-called batch type treatment in which desalting and salt concentration are performed in different time zones, the treatment cannot be continued continuously. Therefore, the problem that the scale of equipment becomes large occurs.

  An object of the present invention is to obtain a salt solution treatment method and a salt solution treatment facility using the treatment method, which are capable of continuously treating the salt solution and are easy to operate.

In order to achieve the above object, the invention according to claim 1
A treatment method for electrically treating a salt solution,
Using a conductive particle slurry in which conductive particles are dispersed in water,
(A) Passing the conductive particles through a positively charged region having a positive electrode to obtain positively charged conductive particles, and separately passing the conductive particles through a negatively charged region having a negative electrode to obtain negatively charged conductive A charging step to obtain particles;
(B) a negative ion adsorption step of obtaining negative ion-adsorbing conductive particles by adsorbing negative ions generated by ionization of the salt to the positively charged conductive particles obtained in the charging step; and obtained in the charging step. A positive ion adsorption step of adsorbing positive ions generated by ionization of the salt to the negatively charged conductive particles to obtain positive ion adsorption conductive particles, in an order of description or in an order opposite to the description, ,
(C) A slurry containing negative ion-adsorbing conductive particles produced through the negative ion adsorption step and a slurry containing positive ion-adsorbing conductive particles produced through the positive ion adsorption step are mixed, and negative Ions that neutralize the charged conductive particles and positively charged conductive particles, desorb positive ions and negative ions in the adsorbed state from the conductive particles, and separate the desorbed ions from the slurry containing the conductive particles A separation process;
(D) A neutralized conductive particle slurry separation step for removing slurry containing neutralized conductive particles after separating ions in the ion separation step.

In the treatment method for electrically treating the salt solution according to the present application,
A conductive particle slurry in which conductive particles are dispersed in water is used.
In the present application, the conductive particles contained in the conductive particle slurry are used for charging, ion adsorption, and ion desorption to perform a predetermined treatment. That is, the salt solution can be desalted in ion adsorption, and the salt treated by ion adsorption can be recovered in ion desorption.

More specifically, in the present method,
(A) In the charging step, the electrically conductive particles are passed through a positively charged region having a positive electrode to obtain positively charged electrically conductive particles, and the electrically conductive particles are separately passed through a negatively charged region having a negative electrode to be negatively charged. Conductive particles are obtained.
The positively charged conductive particles and the negatively charged conductive particles thus obtained can be contacted with a salt dilute solution in which the salt is ionized to perform desalting. That is,
(B) In the adsorption step, a negative ion adsorption step for obtaining negative ion adsorption conductive particles by adsorbing negative ions generated by ionization of the salt to the positively charged conductive particles obtained in the charging step; and the charging step The positive ion adsorption step of adsorbing positive ions generated by ionization of the salt to the negatively charged conductive particles obtained in step 1 to obtain positive ion-adsorbing conductive particles is performed in the order of description or in the reverse order of the description. .

Next, ions can be desorbed by mixing the positively charged conductive particle slurry and the negatively charged conductive particle slurry from the conductive particle slurry that has adsorbed ions in this manner. That is,
(C) In the ion separation step, a slurry containing negative ion adsorption conductive particles generated through the negative ion adsorption step and a slurry containing positive ion adsorption conductive particles generated through the positive ion adsorption step are mixed. The negatively charged conductive particles and the positively charged conductive particles are neutralized, and positive ions and negative ions in the adsorbed state are desorbed from the conductive particles, and the desorbed ions are removed from the slurry containing the conductive particles. To separate.
With the execution of this ion separation process,
(D) In the conductive particle slurry separation step, the slurry containing the neutralized conductive particles after the ions are separated in the ion separation step is taken out.
That is, desalting and salt recovery (concentrated salt) can be performed simultaneously in separate steps.

  This treatment method is a conductive particle slurry separation step in which a slurry containing neutralized conductive particles after separating ions in the ion separation step is taken out, and the slurry containing neutralized conductive particles thus taken out By separating and returning to the charging step, desalting and salt recovery (concentrated salt) treatment can be performed with a constant amount of particles while circulating the conductive particle slurry and continuously using the conductive particles.

Implementation of this processing method can be realized in the following processing equipment.
The treatment equipment for electrically treating the salt solution according to the present application is:
Provided with a conductive particle slurry circulation path in which conductive particles are dispersed in water,
(A) a positive charge processing section (performs a positive charge processing step) for obtaining positively charged conductive particles by passing the conductive particles through a positively charged region having a positive electrode; and a negative charge having a negative electrode. A negative charge processing section (execution of a negative charge processing step) for obtaining negatively charged conductive particles by passing through a charging region;
(B) A negative ion adsorbing unit (negative ion adsorbing step) for obtaining negative ion adsorbing conductive particles by adsorbing negative ions generated by ionization of the salt to the positively charged conductive particles obtained by the positive charging unit. Execution) and a positive ion adsorption unit (positive ion adsorption step) for obtaining positive ion adsorption conductive particles by adsorbing positive ions generated by ionization of the salt to the negatively charged conductive particles obtained in the negative charge processing unit Run)
(C) a solution feeding means for passing the negative ion adsorbing unit and the positive ion adsorbing unit through the solution containing the salt to be treated in the order of description or in the reverse order of the description;
(D) A mixing unit in which a slurry containing negative ion adsorption conductive particles generated through the negative ion adsorption unit and a slurry containing positive ion adsorption conductive particles generated through the positive ion adsorption unit are mixed. With
(E) In the mixing unit, ion separation deriving means (in the mixing unit) for separating and deriving positive ions desorbed from the negatively charged conductive particles and negative ions desorbed from the positively charged conductive particles out of the mixing unit. , Execute ion separation step and conductive particle separation step),
(F) The slurry containing the neutralized conductive particles is taken out in the mixing unit, and is provided with a slurry circulating means (running slurry circulation) for sending the slurry to the positive charging unit and the negative charging unit.

  In the adsorption step, a treatment method for obtaining a salt dilute solution from which salt ions are adsorbed and removed through a negative ion adsorption step and a positive ion adsorption step can be executed.

For this purpose, the processing equipment includes
A salt dilute solution path through which a salt dilute solution from which salt ions have been adsorbed and removed through the negative ion adsorbing unit and the positive ion adsorbing unit may be provided.

  Furthermore, it is possible to carry out a processing method for obtaining a salt-concentrated solution by mixing positive ions and negative ions desorbed from the slurry through the ion separation step in the solution.

For this purpose, the processing equipment includes
A salt concentrated solution path through which a salt concentrated solution generated by mixing positive ions and negative ions desorbed from the slurry in the solution through the mixing unit may be provided.

As a result, it becomes possible to perform desalting treatment and concentrated salt treatment simultaneously,
Furthermore, continuous operation is possible when the conductive particle slurry is individually neutralized and the process is circulated. Further, in this system, the electrode area can be reduced. Further, when the conductive particles deteriorate, the replacement can be performed by separating from the circulation path and in an additional form, thereby facilitating the replacement.

Schematic diagram of a continuous desalination facility according to the present application A graph showing the relationship between residence time (application time) and ion removal rate in the ion adsorption section Schematic diagram of conventional desalination equipment

Hereinafter, a technique for electrically treating a salt solution according to the present application will be described with reference to the drawings.
In the present application, for example, salt water in which salt (NaCl) is dissolved in water is an example of the treatment target liquid.
In the technology according to the present application, desalting that removes salt from the liquid to be treated is the main treatment, but since salt is recovered in an ionic state along with desalting, as shown later, on the other hand, the recovered salt The salt increase treatment by is also performed.
Hereinafter, the processing facility and the processing method according to the present application will be described in this order, and the experiment performed by the inventor regarding the processing performed in a predetermined part of the processing facility will be described.

[Salt solution treatment equipment]
As can be seen from FIG. 1, a treatment facility 100 for electrically treating a salt solution according to the present application includes a circulation path 1 through which a conductive particle slurry in which conductive particles p are dispersed in water w circulates. Along the circulation path 1, each functional unit 2, 3, 4 described below is provided. The conductive particle slurry is circulated in the circulation path 1 by a pair of circulation pumps 5 provided in the circulation path.

From the upstream side of the circulation path 1, the processing facility 100 includes a pair of charging processing units 2 (positive charging processing unit 2 a and negative charging processing unit 2 b) and a pair of ion adsorption units 3 (negative ion adsorption unit 3 a and positive ion adsorption). Part 3 b) and a mixing part 4. Each ion adsorption part 3 is comprised as an ion adsorption tank in the example to show in figure. The mixing unit 4 is provided with a mixing tank.
In the illustrated embodiment, the negative ion adsorbing unit 3a and the positive ion adsorbing unit 3b are provided with a salt dilute solution path 7 provided with a first solution pump 6 serving as a solution feeding means, and a mixing unit 4 serving as a mixing tank. On the other hand, a salt-concentrated solution path 9 including a second solution pump 8 as an ion separation and derivation means is provided.

  As shown in the drawing, a salt concentrated solution to be desalted is fed into the ion adsorbing unit 3 via a salt dilute solution path 7, and after passing through a negative ion adsorbing unit 3a and a positive ion adsorbing unit 3b, A salt dilute solution that is desalted water subjected to desalting treatment can be obtained.

  On the other hand, as shown in the figure, a cleaning liquid (for example, water) is fed into the mixing unit 4 through the salt concentration solution path 9, and salt ions are derived from the mixing unit 4 to increase the salt concentration (ion concentration). A concentrated salt solution can be obtained.

Hereinafter, each part is demonstrated in order.
Charging processor 2 (positive charging processor 2a and negative charging processor 2b)
Each of the charging processing units 2 is configured to include a charging region through which conductive particle slurry flows, and an electrode 20 is provided in contact with the charging region.
The positive charging processing unit 2a includes an electrode 20 with respect to a positively charged region, and is configured to obtain positively charged conductive particles having a positive charge from the conductive particles p in this region.
The negative charging processing unit 2b includes an electrode 20 with respect to a negatively charged region, and the conductive particle p is configured to obtain negatively charged conductive particles having a negative charge in this region.

Ion adsorption unit 3 (negative ion adsorption unit 3a and positive ion adsorption unit 3b)
The ion adsorbing unit 3 is configured such that a salt-concentrated solution to be treated is introduced into the unit, and a residual component from which predetermined ions are removed at this site is derived.
That is, the ion adsorbing unit 3 is configured to include an adsorption region in which the conductive particle slurry is stored and flows in the right direction, and does not pass through the conductive particles p to the solution outlet side (the tank bottom). A permeable membrane portion 35 that permeates ions and solute (specifically water) generated by ionization of the salt is provided.
As a result, it is possible to introduce the solution to be treated into the adsorption region and lead it out of the region while adsorbing predetermined ions.

In more detail, in the negative ion adsorption part 3a, the negative ion produced | generated by ionization of salt is made to adsorb | suck to the positively charged electroconductive particle p obtained by the positive charge process part 2a, and a negative ion adsorption electroconductive particle is obtained.
On the other hand, in the positive ion adsorbing unit 3b, negative ions adsorbing conductive particles are obtained by adsorbing positive ions generated by salt ionization to the negatively charged conductive particles obtained in the negative charging processing unit 2b.

  In the example shown in the figure, a configuration is adopted in which a solution containing a salt to be treated is guided from the negative ion adsorption unit 3a to the positive ion adsorption unit 3b, and the salt dilute solution is taken out from the site, but the ion adsorption units 3a and 3b are employed. The order of can be reversed or reversed.

Mixing unit 4
The mixing unit 4 is composed of a mixing tank as shown in the figure, and includes slurry containing negative ion-adsorbing conductive particles generated through the negative ion adsorption unit 3a and positive ions generated through the positive ion adsorption unit 3b. In this mixing unit 4, positive ions desorbed from the negatively charged conductive particles and negative ions desorbed from the positively charged conductive particles are mixed with the slurry containing the adsorbed conductive particles. In addition, it is configured to be washed with the washing liquid c supplied via the salt concentrated solution path 9 and to be taken out of the mixing unit 4 to take out the salt concentrated solution having an increased salt concentration.

  The slurry of the conductive particles p is neutralized by mixing the positively charged conductive particles and the negatively charged conductive particles in the mixing unit 4, and ions are desorbed and regenerated.

For this purpose, the mixing unit 4 employs a configuration in which a cleaning liquid to be treated (an example of a salt dilute solution) is introduced into the unit, and the remaining components from which predetermined ions are removed at this site are derived. It is comprised so that.
That is, the mixing unit 4 is configured to include a mixing region through which the conductive slurry flows, and the permeation through which the cleaning liquid and the ions forming the salt are transmitted to the cleaning liquid outlet side (tank bottom) without transmitting the conductive particles p. A film part 37 is provided.
As a result, the solution to be treated can be introduced into the mixing region, and ions released from the conductive particles p by neutralization can be led out of the region by the cleaning liquid. As a result, it is possible to regenerate the conductive particles p. In this manner, the neutralized and regenerated conductive particles p are returned to the positive charging processing unit 2a and the negative charging processing unit 2b through the circulation path 1, and are circulated.

[Method of treating salt solution]
As a result, in the treatment facility according to the present application, the salt solution is electrically treated by the following method.
That is, using a conductive particle slurry in which conductive particles are dispersed in water,
(A) In the positive charge processing unit 2a, the conductive particles p are passed through a positive charge region having the positive electrode 20 to obtain positively charged conductive particles. Separately, in the negative charge processing unit 2b, the conductive particles p Performing a charging step of passing through a negatively charged region having the negative electrode 20 to obtain negatively charged conductive particles;
(B) In the negative ion adsorption unit 3a, a negative ion adsorption step of obtaining negative ion adsorption conductive particles p by adsorbing negative ions generated by ionization of the salt to the positively charged conductive particles obtained in the charging step; In the positive ion adsorbing portion 3b, a positive ion adsorption step of adsorbing positive ions generated by ionization of the salt to the negatively charged conductive particles p obtained in the charging step to obtain positive ion adsorption conductive particles p, Execute adsorption steps in the order of description or in the reverse order of description,
(C) In the mixing unit 4, a slurry containing negative ion adsorption conductive particles generated through a negative ion adsorption step and a slurry containing positive ion adsorption conductive particles produced through a positive ion adsorption step are mixed. The negatively charged conductive particles p and the positively charged conductive particles p are neutralized, and positive ions and negative ions in the adsorbed state are desorbed from the conductive particles, and the desorbed ions are included in the conductive particles. An ion separation step for separating from the slurry;
(D) The neutralized electroconductive particle slurry separation process which takes out the slurry containing the electroconductive particle after neutralization after ion separation by the ion separation process is performed.

  The ion adsorbing unit 3 (positive ion adsorbing unit 3a and negative ion adsorbing unit 3b) is provided with the salt dilute solution path 7 and the solution feeding means 6 at this site, so that the salt is ionized in the ion adsorbing unit 3. Thus, the salt is desorbed from the solution, and a salt dilute solution from which salt ions are adsorbed and removed through the negative ion adsorption step and the positive ion adsorption step can be obtained.

  Further, in the mixing unit 4, the salt concentration solution path 9 (washing liquid path) and the ion separation / derivation means 8 are provided at this portion, so that positive ions and negative ions desorbed from the slurry through the ion separation step can be obtained. It can be mixed in the solution to obtain a salt-concentrated solution.

  Hereinafter, the operation status of the present processing facility will be described. In addition, 1050 mg / L-NaCl aqueous solution was used as a salt solution to desalinate.

[Conductive particle slurry]
In the demonstration experiment, a conductive particle slurry in which particles having an average particle diameter of 30 nm were mixed with water at a ratio of 4 g / 60 ml as the conductive particles p was used. In this electroconductive particle slurry, since electroconductive particle p aggregates in water, it was 0.45 micrometer or more substantially.
Therefore, the permeable membranes 35 and 37 introduced above are ultrafiltration membranes made of, for example, PES (made of polyethersulfone) that do not transmit 0.45 μm particles.

[Circulation of conductive particle slurry]
As shown in FIG. 1, the conductive particle slurry is circulated in the circulation path 1 through the electrification processing unit 2, the ion adsorption unit 3, and the mixing unit 4 so that the residence time at each part is 5 to 30 minutes. Controlled.

[Charging]
For charging in the charging processing section, the conductive particles were charged by applying a voltage of 1.0 V between copper electrodes having a substantially effective area of 36 cm ² and a separation distance of 2 cm.
The amount of mobile charge [C] by this charging treatment was 2.52C.
The charge amount can be controlled by the processing time for performing the charging process (in the case where the conductive particle slurry is advected along the electrode, the contact length of the electrode). It became clear.
Table 1 shows the relationship between the processing time [min] and the mobile charge amount [C].
The removal amount [mmol / g-conductive particles] shown in Table 1 is the removal amount of ions when this mobile charge amount is added to the salt solution.

[Ion adsorption]
Table 2 shows the amount of ions that can be removed by the ion adsorption unit using the conductive particle slurry generated by the above charging. This table shows the relationship between the treatment time [min] and the ion concentration [mg / L (L represents liter)]. As can be seen from this table, the Na ⁺ concentration at the start of ion adsorption was 410 [mg / L], and after 30 minutes was 200 [mg / L]. On the other hand, the Cl ⁻ concentration at the start of ion adsorption was 610 [mg / L], and was 340 [mg / L] after 30 minutes.
The removal rate [%] shown in the table represents the actual ion removal rate obtained from the concentration change.

  From the above, the relationship between the amount of charge transferred by charging and the amount of ion adsorption when the processing time in the charging unit 2 and the ion adsorbing unit 3 is 30 minutes can be arranged as follows.

The amount of mobile charge transferred by charging for 30 minutes is 2.52C, which corresponds to an ion amount of 16.5 μmol.
1 [C] = 1.04 × 10 −5 [mol]
2.52 [C] = 16.5 [μmol]

On the other hand, the amount of Na + ions and Cl− ions adsorbed by the ion adsorption treatment for 30 minutes are respectively
Na ⁺ ion amount 1080 [μmol]
Cl ⁻ ion amount 1000 [μmol]
Met.
Therefore, it has been found that ions of about 40 times the moving charge amount are adsorbed and removed by the ion adsorption treatment.
From the above, it can be seen that the so-called desalting treatment can be performed by the ion adsorption treatment.

[Neutralization in the mixing section]
On the other hand, when the concentration of the NaCl solution charged for ion removal was 1050 mg / L, the concentration of the NaCl concentrated solution recovered after neutralization in the mixing unit 4 was 1260 mg / L.
Table 3 below summarizes this state based on the number of moles of the salt to be removed and the ion recovery rate.

  From the above, it can be seen that the salt can be recovered in the mixing section 4 through neutralization of the conductive particle slurry.

[Another embodiment]
(1)
In the above embodiment, the conductive particle slurry is circulated in the circulation path 1 passing through the charging unit 2, the ion adsorption unit 3 and the mixing unit 4, and a certain amount of the conductive particle slurry is continuously used. . However, the gist of the present invention is that desalting is performed using a conductive particle slurry. If a system configuration including the charging unit 2, the ion adsorption unit 3, and the mixing unit 4 is adopted, the salt is desorbed. Salt-diluted solution and salt-concentrated salt-concentrated solution can be obtained.
That is, the conductive particle slurry is not necessarily required to be circulated as long as a sufficient amount of the conductive particle slurry can be secured with respect to the concentrated salt solution to be treated.

DESCRIPTION OF SYMBOLS 1: Circulation path 2: Charging process part 2a: Positive charge process part 2b: Negative charge process part 3: Ion adsorption part 3a: Negative ion adsorption part 3b: Positive ion adsorption part 4: Mixing part 5: Circulation pump (slurry circulation means )
6: First solution pump (solution feeding means)
7: Salt dilute solution path (solution feeding means)
8: Second solution pump (ion separation derivation means)
9: Salt concentration solution path (ion separation derivation means)
20: Electrode 35: Permeation membrane part 37: Permeation membrane part p: Conductive particle w: Water

Claims (7)

A treatment method for electrically treating a salt solution,
Using a conductive particle slurry in which conductive particles are dispersed in water,
(A) Passing the conductive particles through a positively charged region having a positive electrode to obtain positively charged conductive particles, and separately passing the conductive particles through a negatively charged region having a negative electrode to obtain negatively charged conductive A charging step to obtain particles;
(B) a negative ion adsorption step of adsorbing negative ions generated by ionization of salt to the positively charged conductive particles obtained in the charging step to obtain negative ion adsorbing conductive particles; and obtained in the charging step A positive ion adsorption step of obtaining positive ion adsorption conductive particles by adsorbing positive ions generated by ionization of the salt to the negatively charged conductive particles, an adsorption step performed in the order of description or in the reverse order of the description;
(C) A slurry containing negative ion-adsorbing conductive particles produced through the negative ion adsorption step and a slurry containing positive ion-adsorbing conductive particles produced through the positive ion adsorption step are mixed, and negative Ions that neutralize the charged conductive particles and positively charged conductive particles, desorb positive ions and negative ions in the adsorbed state from the conductive particles, and separate the desorbed ions from the slurry containing the conductive particles A separation process;
(D) The processing method provided with the neutralized electroconductive particle slurry separation process which takes out the slurry containing the neutralized electroconductive particle after isolate | separating ion by the said ion separation process.   The processing method according to claim 1, wherein in the adsorption step, a salt dilute solution from which salt ions are adsorbed and removed is obtained through a negative ion adsorption step and a positive ion adsorption step.   The processing method according to claim 1, wherein the positive ions and negative ions desorbed from the slurry through the ion separation step are mixed in the solution to obtain a salt-concentrated solution.   The conductive slurry obtained through the conductive particle slurry separation step is divided and returned to the positive charging region and the negative charging region, respectively, and the charging step is executed. Processing method. A treatment facility for electrically treating a salt solution,
Provided with a conductive particle slurry circulation path in which conductive particles are dispersed in water,
(A) A positively charged processing unit that obtains positively charged conductive particles by passing the conductive particles through a positively charged region having a positive electrode; and negatively charged by passing the conductive particles through a negatively charged region having a negative electrode. A negatively charged processing unit for obtaining conductive particles,
(B) a negative ion adsorbing unit that obtains negative ion adsorbing conductive particles by adsorbing negative ions generated by ionization of salt to the positively charged conductive particles obtained by the positive charging processing unit; and the negative charging processing unit A positive ion adsorbing part that adsorbs positive ions generated by ionization of the salt to the negatively charged conductive particles obtained in step 1 to obtain positive ion adsorbed conductive particles;
(C) a solution feeding means for passing the negative ion adsorbing unit and the positive ion adsorbing unit through the solution containing the salt to be treated in the order of description or in the reverse order of the description;
(D) A mixing unit in which a slurry containing negative ion adsorption conductive particles generated through the negative ion adsorption unit and a slurry containing positive ion adsorption conductive particles generated through the positive ion adsorption unit are mixed. With
(E) an ion separation and derivation means for separating and deriving positive ions desorbed from the negatively charged conductive particles and negative ions desorbed from the positively charged conductive particles in the mixing unit and out of the mixing unit;
(F) A processing facility comprising a slurry circulating means for taking out the slurry containing conductive particles neutralized in the mixing section and sending the slurry to the positive charging processing section and the negative charging processing section.   The processing equipment according to claim 5, further comprising a salt dilute solution path through which the salt dilute solution from which salt ions are adsorbed and removed is passed through the negative ion adsorbing unit and the positive ion adsorbing unit.   The processing equipment according to claim 5 or 6, further comprising a salt concentration solution path through which a salt concentration solution generated by mixing positive ions and negative ions desorbed from the slurry in the solution through the mixing unit is guided. .

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