CN111269338B

CN111269338B - Chelate resin with 4-piperidyl piperidine as ligand and preparation method and application thereof

Info

Publication number: CN111269338B
Application number: CN202010247779.2A
Authority: CN
Inventors: 韩得满; 袁其亮; 李嵘嵘; 陈寅镐; 姚武冰; 王超
Original assignee: Taizhou University
Current assignee: Taizhou University
Priority date: 2020-03-31
Filing date: 2020-03-31
Publication date: 2021-04-13
Anticipated expiration: 2040-03-31
Also published as: CN111269338A

Abstract

The invention discloses a chelating resin with 4-piperidyl piperidine as a ligand, and a structural unit is shown as a formula (I). The chelating resin can selectively adsorb nickel ions in the leaching solution and the Mn in the leaching solution²⁺、Zn²⁺、Co²⁺、Cu²⁺The adsorption amount of (2) is low; the adsorption speed is high, the elution time is short, and the recovery time can be shortened; the elution rate is high and the device can be repeatedly used. The invention also discloses a preparation method of the chelating resin, firstly, soaking the chlorine ball in DMF until the chlorine ball is fully swelled; sequentially adding 4-piperidyl piperidine and a catalyst, and then carrying out substitution reaction under the protection of inert gas; filtering the reaction solution, washing the filter cake with DMF and water, soaking in saturated sodium hydroxide solution or potassium hydroxide solution, washing again, and vacuum drying to obtain the chelating resin. The method has the advantages of easily-accessible raw materials, simple operation, and high yield. The invention also provides application of the chelating resin in the recovery of raney nickel in chemical wastewater.

Description

Chelate resin with 4-piperidyl piperidine as ligand and preparation method and application thereof

Technical Field

The invention relates to the technical field of chelate resin, in particular to chelate resin, a preparation method thereof and application thereof in nickel recovery.

Background

In recent years, environmental pollution is aggravated, heavy metal pollution is more serious, and especially heavy metal waste liquid discharged by industries such as electroplating, industrial and mining, chemical engineering and the like is more serious. Nickel is widely used in electroplating, printed circuit board, materials and other industries, and these industries discharge a large amount of nickel-containing wastewater every day. Nickel is used as a second prevention and control heavy metal pollutant, and the emission concentration of the nickel cannot be too high. At present, the key point for solving the problem is to find a nickel wastewater treatment method which is simple to operate, low in cost and high in efficiency.

At present, the methods for treating nickel-containing wastewater mainly comprise a precipitation method, a reduction method, an ion exchange method and a resin adsorption method. The precipitation method and the reduction method have the advantages of simple operation, low treatment cost and the like, and are adopted by most of small and medium-sized enterprises. However, the traditional method can not treat the nickel complex wastewater, so that the concentration of nickel content in the wastewater can not meet the standard requirement.

The resin adsorption method has the advantages of high mechanical strength, good chemical stability, no secondary pollution and the like, and has better application prospect for recovering nickel in wastewater. Especially, the chelate adsorption resin is widely applied to selectively separating and enriching trace metal ions in aqueous solution due to the advantages of large adsorption capacity, high enrichment times, good selectivity, simple and convenient operation, easy regeneration and the like.

However, when the existing chelating resin is used for recovering the metallic nickel, the influence of other ions is difficult to avoid. The Chinese patent application with publication number CN110453070A discloses a chelating resin for extracting nickel from lateritic nickel ore leaching liquor, which can selectively adsorb nickel ions to realize separation from iron, manganese and calcium impurity ions, and is verified to be ion exchange resin in the embodiment of the invention, and another Chinese patent with publication number CN104231141B records that the chelating resin has high selectivity to copper and the adsorption capacity is 0.5 mmol/g. Therefore, it is highly desirable to develop a chelating resin that can selectively adsorb nickel ions and achieve separation from the hetero-ions.

Disclosure of Invention

To solve the problemIn order to solve the technical problems, the invention provides the chelate resin which takes the chlorine ball as a matrix and the 4-piperidyl piperidine as a ligand, and the chelate resin has the advantages of good nickel ion adsorption performance, high selectivity and Mn resistance²⁺、Zn²⁺、Co²⁺、Cu²⁺The adsorption capacity is small; the pH value of the optimum acidity is weak acidity; the adsorption speed is high, the elution time is short, and the operation time can be shortened; high elution rate, reusability and the like. The invention also provides a preparation method of the chelating resin and application of the chelating resin in nickel recovery.

The technical scheme provided by the invention for solving the technical problems is as follows:

a chelate resin takes a chloromethylated bead as a matrix and 4-piperidyl piperidine as a ligand, and the structural unit is shown as a formula (I):

the chlorine sphere is macroporous chloromethylation crosslinked polystyrene microsphere, also named macroporous chloromethylation crosslinked polystyrene or PS-CH₂Cl。

The invention also provides a preparation method of the chelating resin, which takes chloromethyl polystyrene (chloromethylated polystyrene) as a matrix and 4-piperidyl piperidine as a ligand and specifically comprises the following steps:

(1) soaking the chlorine ball in N, N-dimethylformamide until the chlorine ball is fully swelled;

(2) adding 4-piperidyl piperidine and a catalyst into the product obtained in the step (1), and then carrying out substitution reaction under the protection of inert gas;

(3) and (3) filtering the obtained product in the step (2), washing a filter cake by using N, N-dimethylformamide and water, soaking the filter cake in a saturated sodium hydroxide solution or a potassium hydroxide solution, washing the filter cake by using deionized water and an organic solvent, and finally drying the filter cake in vacuum to obtain the chelate resin.

In the step (1), the soaking time is 12-48 hours.

In the step (2), in order to modify a sufficient amount of the chelating functional group on the chlorine sphere, it is preferable that the chelating functional group is modified in the step (2)4-piperidylpiperidine and-CH in chloromethylated ethylene glycol₂The amount of Cl is 3:1 to 5: 1.

The reaction time of the substitution reaction is 12-14 hours; the temperature of the substitution reaction is 90-130 ℃.

The catalyst is Na.

In the step (3), the N, N-dimethylformamide and the water are washed to wash away the ligand and the solvent attached to the surface. The soaking in saturated sodium hydroxide solution or potassium hydroxide solution is to neutralize HCl generated in the reaction, so as to avoid the byproduct H in the step (2)⁺The adhesion to the resin will generate an electrostatic repulsive force to the nickel ions, which will affect the adsorption of nickel.

The organic solvent washing is sequentially and respectively rinsed by ethanol, acetone and ether and washed for three times.

The invention also provides the chelate resin prepared by the preparation method.

The invention also provides an application of the chelating resin in nickel recovery, which comprises the following steps:

(a) placing the chelating resin in acetic acid-sodium acetate buffer solution for soaking and activating;

(b) adding a nickel ion standard solution into the obtained substance in the step (a), and shaking for 0.4-0.6 h at constant temperature;

(c) after the adsorption balance in the step (b), measuring the concentration of residual metal ions in the buffer solution, and calculating the saturated adsorption capacity of the chelating resin to nickel ions;

(d) separating the chelate resin after the adsorption balance in the step (c), soaking the chelate resin in eluent, and shaking for 0.4-0.6 h at constant temperature;

(e) and (d) after the elution in the step (d) is balanced, measuring the concentration of nickel ions in the eluent, and calculating the desorption rate.

The soaking time is 12-48 h.

The acetic acid-sodium acetate buffer solution is preferably an acetic acid-sodium acetate buffer solution with the pH value of 4-6, and is more preferably an acetic acid-sodium acetate buffer solution with the pH value of 5.

When the pH is more than 6, the nickel ions are easily hydrolyzed, and the hydrolysis product is covered on the resin, so that the adsorption reaction is difficult to continue.

The invention also provides a method for recovering nickel by using the chelating resin, which comprises the following steps:

adjusting the pH value of the leachate containing nickel ions to 4-6, and adding the chelating resin to enrich the nickel ions in the leachate to obtain the chelating resin with balanced adsorption;

and (II) separating the chelate resin with balanced adsorption, and soaking the chelate resin with the eluent to obtain the eluent containing nickel ions.

The enrichment time is 0.4-0.6 hour.

The time for soaking the eluent is 0.4-0.6 hours.

The method for recovering nickel by using the chelating resin comprises the following steps: and reducing the eluent containing the nickel ions to prepare the nickel.

The reduction method is a hydrazine hydrate reduction method, and comprises the following steps:

adjusting the pH value of the eluent containing nickel ions to 11-13 by using strong base, adding hydrazine hydrate, and stirring for 20-50 minutes at 50-70 ℃; separating the precipitate, washing with water to neutrality, and drying to obtain simple substance nickel.

The solid-to-liquid ratio of the chelating resin to the leachate is 1g: 300ml to 500 ml.

The strong base is sodium hydroxide or potassium hydroxide.

The eluent is hydrochloric acid with the concentration of 1-5 mol/L.

The solid-liquid ratio of the chelating resin to the eluent is 1g, 50-200 mL.

The following experiments can be carried out with the chelating resins of the invention:

1. nickel ion adsorption experiments.

Weighing a certain amount of the chelate resin, placing the chelate resin in an iodine measuring flask, adding hydrochloric acid with different pH values, soaking for 24 hours, then adding heavy metal ion standard solution, placing the iodine measuring flask in a constant temperature oscillator, shaking at constant temperature, and carrying out adsorption operation under the condition of constant speed stirring. And measuring and analyzing the concentration of the residual heavy metal ions in the water phase at intervals until the water phase is balanced. By the following formulaCalculation of adsorption Capacity (Q)_e)：

Wherein, Q in the formula_eIs the equilibrium adsorption capacity (mg/g) of the resin; c₀And C_eThe initial degree (mg/mL) and the equilibrium concentration (mg/mL) of the metal ion in the solvent phase, respectively; m is the resin mass (g); v is the volume of the metal ion solution (mL).

2. Nickel ion desorption experiments.

And washing the resin after adsorption balance by using deionized water until the filtered solvent is colorless, removing residual moisture on the surface of the resin, adding a desorbent to soak the resin after air drying, and measuring the concentration of cadmium ions in the solution after constant-temperature oscillation until the solution is balanced. The desorption rate E (%) was calculated as follows:

in the formula C_dThe equilibrium concentration (mg/mL) of metal ions in the desorption solution; v_dVolume of desorption solution used (mL); c₀And C_eThe initial degree (mg/mL) and the equilibrium concentration (mg/mL) of the metal ion in the solvent phase, respectively; v is the volume of the metal ion solution (mL).

The invention has the following beneficial effects:

1. the preparation method provided by the invention is simple and convenient to operate, the synthetic raw materials are simple and easy to obtain, and the preparation yield is high.

2. The raw material chlorine ball adopted by the invention is cheap and easy to obtain, and has higher mechanical strength and physical stability.

3. The chelating adsorption resin has strong selective adsorption performance on metal nickel ions and Mn²⁺、Zn²⁺、Co²⁺、Cu²⁺The adsorption amount of the metal ions is low.

4. The chelating adsorption resin of the invention is used for the treatment of Ni²⁺The adsorption speed is high, the adsorption equilibrium time is shortened, and the method has the advantages ofThe surface can avoid adsorbing impurities due to long-time adsorption, and on the other hand, the operation time can be shortened; the chelating adsorption resin has high desorption speed in eluent; the desorption can be completed within about 30min, and the time cost is reduced.

5. The chelating adsorption resin is easy to elute after adsorbing nickel ions, can be completely eluted only by using a small amount of hydrochloric acid solution, has good reproducibility and can be repeatedly used.

6. The chelating adsorption resin has large adsorption capacity and good selectivity, and has good application value in the field of separation and enrichment of metal nickel ions.

Drawings

FIG. 1 is a reaction scheme of the preparation method of the present invention.

FIG. 2 is an infrared spectrum of raw material chlorine ball.

FIG. 3 is an infrared spectrum of chelate resin-1 of example 1.

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.

Example 1: preparation of chelate resin-1 with 4-piperidyl piperidine as ligand and chlorine ball as matrix

Accurately weighing 20mg of chlorine balls (Nankai university chemical plant, crosslinking degree of 8 percent, wherein-CH) at normal temperature₂Cl content 5.394mmol/g) was placed in a 250ml three-necked flask, and 150ml of N, N-dimethylformamide as a solvent was added thereto, followed by overnight immersion until the chlorine spheres were sufficiently swollen.

Step (2): adding 4-piperidyl piperidine (72.5mg) serving as a ligand and a small amount of metallic sodium (5mg) serving as a catalyst into the obtained product in the step (1), and continuously and fully stirring the mixture at 110 ℃ for 13 hours under the protection of sufficient nitrogen, wherein the 4-piperidyl piperidine and chloromethylated beads areupper-CH₂The mass ratio of Cl was 4: 1.

And (3): and (3) filtering the obtained substance in the step (2), washing the obtained filter cake with DMF three times (20 ml for each dosage), rinsing the filter cake three times with distilled water after the filter liquor is colorless, soaking the treated filter cake in a saturated sodium hydroxide solution (50 ml in volume), washing the filter cake three times with deionized water after 2 hours, washing the filter cake three times with ethanol, acetone and diethyl ether in turn (20 ml for each dosage of each solvent), and drying the filter cake in vacuum at 50 ℃ to obtain the chelating resin-1.

The infrared spectrogram of the raw material chlorine ball is shown in figure 2: 670.7cm^-1Is the absorption peak of the C-Cl bond in the chlorine ball, 1264cm^-1In which the radical is-CH strengthened by the presence of Cl₂-non-planar rocking vibration absorption peaks.

The infrared spectrum of chelating resin-1 is shown in FIG. 3: 1017cm^-1Characteristic absorption peak at-C-N-and 670.7cm^-1And 1264cm^-1The characteristic peak at (a) disappeared, indicating that the ligand 4-piperidinylpiperidine was successfully grafted onto the chlorosphere by the substitution reaction.

EXAMPLE 2 preparation of chelate resin-2 with 4-piperidylpiperidine as ligand and a chlorine sphere as parent

Accurately weighing 20mg of chlorine balls (the source is south China university chemical plant, the crosslinking degree is 8 percent, wherein-CH is₂Cl content of 5.394mmol/g), transferred into a 250ml three-necked flask, added with 150ml of N, N-dimethylformamide and soaked overnight to fully swell the chlorine spheres.

Step (2) to the product obtained in step (1), 4-piperidyl piperidine (54.4mg) as a ligand and a small amount of metallic sodium (5mg) as a catalyst were added, and the mixture was stirred continuously and sufficiently at 120 ℃ for 13 hours under the protection of sufficient nitrogen, wherein 4-piperidyl piperidine and chlorosphere-CH₂The mass ratio of Cl was 3: 1.

And (3) after the reaction in the step (3) is naturally cooled, filtering the obtained product in the step (2), washing the obtained filter cake with DMF three times (20 ml for each dosage), rinsing the filtrate with distilled water three times after the filtrate is colorless, soaking the treated filter cake in a saturated sodium hydroxide solution (50 ml in volume), washing the filter cake with deionized water three times after 2 hours, washing the filter cake with ethanol, acetone and diethyl ether in sequence (20 ml for each dosage of each solvent), and drying the filter cake in vacuum at 50 ℃ to obtain the chelating resin-2.

EXAMPLE 3 preparation of chelate resin-3 with 4-piperidylpiperidine as ligand and a chlorine sphere as parent

Accurately weighing 20mg of chlorine balls (the source is south China university chemical plant, the crosslinking degree is 8 percent) by an electronic balance under the normal temperature condition, wherein-CH₂Cl content of 5.394mmol/g), transferred into a 250ml three-necked flask, added with 150ml of N, N-dimethylformamide and soaked overnight to fully swell the chlorine spheres.

Step (2) to the product obtained in step (1), 4-piperidyl piperidine (90.6mg) as a ligand and a small amount of metallic sodium (5mg) as a catalyst were added, and the mixture was stirred continuously and sufficiently at 100 ℃ for 13 hours under the protection of sufficient nitrogen, wherein 4-piperidyl piperidine and chlorosphere-CH₂The mass ratio of Cl was 5: 1.

And (3) after the reaction in the step (3) is naturally cooled, filtering the obtained product in the step (2), washing the obtained filter cake with DMF three times (20 ml for each dosage), rinsing the filtrate with distilled water three times after the filtrate is colorless, soaking the treated filter cake in a saturated sodium hydroxide solution (50 ml in volume), washing the filter cake with deionized water three times after 2 hours, washing the filter cake with ethanol, acetone and diethyl ether in sequence (20 ml for each dosage of each solvent), and drying the filter cake in vacuum at 50 ℃ to obtain the chelating resin-3.

Test example 1: measurement of adsorption Capacity

At room temperature, 15mg of chelate resin-1 was accurately weighed, placed in an iodine vial, 23.5ml of an acetic acid-sodium acetate buffer solution having a pH of 4 was added, and the mixture was shaken at constant temperature for 24 hours. After the immersion, 1.5ml of a nickel ion solution (nickel chloride) having a metal concentration of 2g/L was added. The mixture was stirred at constant speed for 48 hours with constant temperature shaking. Determination of residual Ni in aqueous phase²⁺The calculated adsorption capacity Qe was 75 mg/g.

At room temperature, 15mg of chelating resin-2 was accurately weighed, placed in an iodine vial, 23.5ml of an acetic acid-sodium acetate buffer solution having a pH of 5 was added, and the mixture was shaken at constant temperature for 24 hours. After the immersion, 1.5ml of a nickel ion solution having a metal concentration of 2g/L was added. Under the condition of constant-speed stirringShaking at constant temperature for 48 hours. Determination of residual Ni in aqueous phase²⁺Calculated as the adsorption capacity Qe, was 68 mg/g.

At room temperature, 15mg of chelating resin-3 was accurately weighed, placed in an iodine vial, 23.5ml of an acetic acid-sodium acetate buffer solution having a pH of 6 was added, and the mixture was shaken at constant temperature for 24 hours. After the immersion, 1.5ml of a nickel ion solution having a metal concentration of 2g/L was added. The mixture was stirred at constant speed for 48 hours with constant temperature shaking. Determination of residual Ni in aqueous phase²⁺The calculated adsorption capacity Qe was 72 mg/g.

Test example 2: experiment of adsorption velocity

30mg of chelate resin-1 was weighed out accurately and placed in an iodine flask, 48.0ml of a pH 5 sodium acetate buffer solution was added thereto, and the mixture was shaken at a constant temperature for 24 hours. After soaking, Ni with metal concentration of 2mg/ml is added into an iodine measuring flask²⁺2.0ml of the solution. Oscillating at constant temperature, sampling at 1, 2, 4, 5, 10, 15, 20, 30, 40, 60, 120, and 180min respectively, calculating adsorption amount, and measuring adsorption equilibrium time to be 30min and equilibrium adsorption amount to be 72.5 mg/g.

Test example 3: selective adsorption experiment

15mg of chelate resin-1 was weighed and added to 25mL of a solution containing Ni in a concentration of 100mg/L²⁺、Mn²⁺、Zn²⁺、Co²⁺Ion, pH of the solution was 5, an adsorption experiment was performed at 25 ℃, the concentration of the metal ion remaining in the solution after 24 hours of adsorption was measured, and the amount of adsorption of the metal ion by the chelate resin-1 was calculated, and the results are shown in table 1.

TABLE 1

	Ni²⁺	Mn²⁺	Zn²⁺	Co²⁺
					Q(mg/g)	70	3.2	3.5	4.1

And (4) conclusion: the chelating resin selectively adsorbs Ni²⁺To Mn²⁺、Zn²⁺、Co²⁺The plasma metal ions hardly adsorb.

Test example 4: measurement of elution Rate

At room temperature, 15mg of chelate resin-1, chelate resin-2 and chelate resin-3 were weighed out accurately, placed in three iodine vials, 23.5ml of each acetic acid-sodium acetate buffer solution with pH 5 was added, and the mixture was shaken at constant temperature for 24 hours. After the immersion, 1.5ml of Ni ion solution having a metal concentration of 2g/L was added. After the adsorption equilibrium, the adsorbed amounts were measured and found to be 75, 68 and 72mg/g, respectively. Separating the adsorbed resin solution with a sand core funnel, separating out the resin, fully washing the resin with an acetic acid-sodium acetate buffer solution with the pH value of 5 and distilled water until the filtering solvent is colorless, sucking the residual water on the surface of the resin with a filter paper, soaking the resin with 25ml of 1.0mol/L HCl solution for 0.5h, oscillating at constant temperature for balancing, and determining the concentration of metal nickel ions in the liquid phase to be 44.91mg/L, 40.51mg/L and 42.98mg/L, wherein the desorption rate E is 99.8%, 99.3% and 99.5%.

The desorption rate E (%) was calculated as follows:

Test example 5 reusability test

The chelate resins-1 to-3 tested in test example 4 were washed with distilled water three times, and vacuum dried.

Test example 4 experiment was repeated 5 times, and the adsorption capacity of the resin was maintained at 90% or more of the first adsorption capacity.

And (4) conclusion: the chelate resin prepared by the invention has good repeatability, and takes the 4-piperidyl piperidine as a ligand and the chlorine sphere as a parent.

Application example 1 recovery of Nickel from Nickel-containing wastewater

Taking 50ml of nickel (Ni)²⁺) The waste water was measured by ICP-AES to have a concentration of 20.05 mg/L.

Adjusting pH of the nickel wastewater to 5 with acetic acid-sodium acetate, adding 100mg of chelating resin-1, soaking for 0.6h to enrich Ni²⁺。

Separating the chelate resin-1 with equilibrium adsorption, soaking in 1mol/L HCl solution (10ml) for 0.5h, desorbing Ni²⁺。

Adjusting pH of the eluate to 12 with sodium hydroxide, adding hydrazine hydrate as reducing agent into the eluate, and stirring at 60 deg.C for 30 min; and (3) carrying out suction filtration to separate out black precipitate, repeatedly washing the black precipitate to be neutral by using distilled water, and drying the black precipitate in a vacuum drying oven at the temperature of 50 ℃ to obtain 0.983mg of elemental nickel powder. The purity of nickel reaches 99.8%, the nickel residue on the resin is less than 0.1%, and the recovery rate is 99%.

Application example 2 treatment of nickel in Raney nickel catalyst wastewater

50ml of waste water of Raney nickel used in industrial production is taken, and the concentration of nickel ions is 43.81mg/L by ICP-AES determination.

Adjusting pH of the nickel wastewater to 5 with acetic acid-sodium acetate, adding 200mg of chelating resin-1, soaking for 0.6h to enrich Ni²⁺。

Separating the chelate resin-1 with equilibrium adsorption, soaking in 1mol/LHCl solution (10ml) for 0.5h, desorbing Ni²⁺。

Adjusting pH of the eluate to 12 with sodium hydroxide, adding hydrazine hydrate as reducing agent into the eluate, and stirring at 60 deg.C for 30 min; and (3) carrying out suction filtration to separate out black precipitates, repeatedly washing the black precipitates to be neutral by using distilled water, and drying the black precipitates in a vacuum drying oven at 50 ℃ to obtain 2.147mg of elemental nickel powder. The purity of nickel reaches 99.7%, the nickel residue on the resin is less than 0.1%, and the recovery rate is 99%.

Claims

1. The chelate resin with chlorine spheres as a matrix is characterized in that a structural unit of the chelate resin is shown as a formula (I):

2. the method for preparing the chelating resin as set forth in claim 1, wherein the method comprises the following steps:

3. The method of claim 2, wherein the 4-piperidylpiperidine and chlorosphere have a-CH structure₂The amount ratio of Cl is 3:1 to 5: 1.

4. The method of claim 2, wherein the temperature of the substitution reaction is 90 ℃ to 130 ℃; the reaction time of the substitution reaction is 12 to 14 hours.

5. Use of the chelating resin as defined in claim 1 for the recovery of metals, wherein said metals are nickel.

6. Use according to claim 5, characterized in that it comprises the following steps:

(b) adding a nickel ion standard solution into the obtained substance in the step (a), and shaking at constant temperature for 0.4-0.6 h;

(c) and (c) after the adsorption balance in the step (b), measuring the concentration of residual metal ions in the buffer solution, and calculating the saturated adsorption capacity of the chelating resin to the nickel ions.

7. The use according to claim 6, further comprising the steps of:

(d) separating the chelate resin after the adsorption balance in the step (c), soaking the chelate resin in eluent, and shaking at constant temperature for 0.4-0.6 h;

8. A method for recovering nickel from the chelate resin according to claim 1, comprising the steps of:

(I) adjusting the pH value of the leachate containing nickel ions to 4-6, and adding the chelating resin to enrich the nickel ions in the leachate to obtain chelating resin with balanced adsorption;

(II) separating the chelate resin with balanced adsorption, and soaking the chelate resin with the eluent to obtain the eluent containing nickel ions.

9. The method for recovering nickel according to claim 8, characterized by comprising the steps of: and reducing the eluent containing the nickel ions to prepare the nickel.

10. The method for recovering nickel according to claim 8, wherein the eluent is hydrochloric acid of 1mol/L to 5 mol/L.