CN112941321B - Method for strengthening leaching reaction of neodymium iron boron magnet by combining electrochemical anodic oxidation with ionic flocculant - Google Patents

Method for strengthening leaching reaction of neodymium iron boron magnet by combining electrochemical anodic oxidation with ionic flocculant Download PDF

Info

Publication number
CN112941321B
CN112941321B CN202110102614.0A CN202110102614A CN112941321B CN 112941321 B CN112941321 B CN 112941321B CN 202110102614 A CN202110102614 A CN 202110102614A CN 112941321 B CN112941321 B CN 112941321B
Authority
CN
China
Prior art keywords
iron boron
neodymium iron
electrolyte
electrolysis
magnet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202110102614.0A
Other languages
Chinese (zh)
Other versions
CN112941321A (en
Inventor
张兴旺
周利娜
苏志伟
雷乐成
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang University ZJU
Quzhou Research Institute of Zhejiang University
Original Assignee
Zhejiang University ZJU
Quzhou Research Institute of Zhejiang University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhejiang University ZJU, Quzhou Research Institute of Zhejiang University filed Critical Zhejiang University ZJU
Priority to CN202110102614.0A priority Critical patent/CN112941321B/en
Publication of CN112941321A publication Critical patent/CN112941321A/en
Application granted granted Critical
Publication of CN112941321B publication Critical patent/CN112941321B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/006—Wet processes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B59/00—Obtaining rare earth metals
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/34—Anodisation of metals or alloys not provided for in groups C25D11/04 - C25D11/32
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D21/00—Processes for servicing or operating cells for electrolytic coating
    • C25D21/16—Regeneration of process solutions
    • C25D21/18—Regeneration of process solutions of electrolytes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Abstract

The invention discloses a method for strengthening a leaching reaction of a neodymium iron boron magnet by combining electrochemical anodic oxidation with an ionic flocculant, which comprises the following steps: the neodymium iron boron waste magnet is used as an anode of an electrolysis system, an inert conductive material is used as a cathode, electrolysis is carried out at room temperature, rare earth and iron elements in the neodymium iron boron waste magnet enter a solution, and an ionic flocculating agent moves rapidly under an electric field to promote metal element precipitation and strengthen leaching reaction. And after the electrolysis is finished, filtering to obtain a recovered product, and recycling the electrolyte to the electrolysis process. According to the invention, metal ions in the neodymium iron boron magnet are directly leached out by an electrochemical anodic oxidation method, and can be precipitated by a flocculating agent, so that a large amount of tail gas generated by high-temperature roasting is avoided; the electrolyte uses cheaper and easily obtained reagents to replace substances such as hydrochloric acid, oxalic acid and the like, so that the discharge amount of acidic wastewater is reduced, and the cost is reduced; the recovered product is loose mixed hydroxide, which is convenient for subsequent acid dissolution to separate neodymium and iron elements.

Description

Method for strengthening leaching reaction of neodymium iron boron magnet by combining electrochemical anodic oxidation with ionic flocculant
Technical Field
The invention belongs to the technical field of industrial waste recycling, and relates to a method for strengthening a leaching reaction of a neodymium iron boron magnet by combining electrochemical anodic oxidation with an ionic flocculant.
Background
The neodymium iron boron permanent magnet material has extremely high magnetic energy and rectification power, and is widely applied to a plurality of fields such as automobiles, energy sources, medical appliances, electronic products and the like. In recent years, the yield of neodymium iron boron is increased year by year, and the export quantity of the neodymium iron boron products in China in 2019 reaches 4.07 ten thousand tons, which is increased by 3.71 percent on a same scale. Due to process and equipment problems, about 25% of waste materials are generated in the production process of neodymium iron boron, wherein rare earth elements account for about 33%, and serious pollution and waste are caused. Therefore, the rare earth elements in the neodymium iron boron waste materials are recycled, so that the secondary utilization rate of the rare earth resources can be improved, the supply pressure of the rare earth resources is relieved, and huge social benefits and economic benefits can be obtained.
At present, the recovery process of the neodymium iron boron waste materials mainly comprises a fire method and a wet method. The pyrometallurgical method has less environmental pollution, but the recovery rate and purity of the extracted rare earth elements are low, and a single rare earth product is difficult to obtain. The wet method is a widely adopted process at present, wherein the hydrochloric acid method is mature in industrial application. Firstly, the iron element in the neodymium iron boron waste is converted into Fe through high-temperature roasting 2 O 3 And then dissolved by low-concentration hydrochloric acid. The rare earth is preferentially leached out, the Fe in the leaching solution 3+ The pH value can be adjusted to 4.5-5 by ammonia gas or ammonia water, so that Fe (OH) is used 3 Form precipitation, and then obtaining the rare earth compound by extraction or oxalic acid precipitation. The process has the advantages of large treatment capacity, relatively low recovery cost and simple process, but the oxidation roasting process has high energy consumption and large tail gas emission, and some neodymium iron boron wastes can generate sparks during grinding and calcining, so that the process has great potential safety hazards. In the acid dissolution process, low-concentration acid is adopted, so that a large amount of wastewater is generated at the same time of low reaction rate, iron element is contained in the acidic wastewater, waste and pollution are caused, and the treatment cost is high. Therefore, in the process of recovering rare earth elements from neodymium iron boron waste, the key is to reduce the separation cost of rare earth and iron, the energy consumption of roasting and oxidation is high, the pollution in the acid dissolution process is large, the cost is high, and the pretreatment cost needs to be reduced as much as possible to improve the economic benefit.
The invention patent CN109439913A discloses a method for comprehensively recovering neodymium iron boron waste acid leaching residue by flash reduction. Drying neodymium iron boron waste acid leaching residues, spraying the dried neodymium iron boron waste acid leaching residues and reducing gas into a high-temperature vertical reaction tower space through a nozzle, controlling the reducing atmosphere, reducing iron oxides in the materials into metallic iron or ferroferric oxide, and not reducing rare earth oxides in the materials. And magnetically separating the reduction product to obtain an iron-rich phase and a rare earth-rich phase respectively.
Chinese patent CN109439913A discloses a high-temperature high-pressure leaching recovery methodA method for preparing rare earth in neodymium iron boron waste. The method comprises the steps of oxidizing and roasting neodymium iron boron waste, leaching the neodymium iron boron waste at high temperature and high pressure by hydrochloric acid, and leaching Fe in leaching liquid 2+ Oxidizing, removing impurities and purifying to obtain rare earth chloride leachate; and the rare earth chloride leachate can be used as a subsequent process and a product raw material, rare earth is obtained through extraction and separation, and rare earth carbonate is prepared through precipitation or rare earth oxide is prepared through precipitation and roasting.
Therefore, the existing technology mostly recovers the rare earth elements in the neodymium iron boron waste materials by means of high temperature, high pressure, strong acid and the like, and has the problems of large pollution and high cost.
The Chinese patent No. CN111575509A discloses a method for recovering rare earth elements from neodymium iron boron magnet waste, which comprises the following steps: mixing the neodymium iron boron magnet waste with a hydrochloric acid solution containing ammonium chloride to obtain a solid-liquid mixture; and carrying out oxidation reaction on the solid-liquid mixture and hydrogen peroxide to obtain an oxidation product. The method can avoid high-temperature roasting and large amount of tail gas.
The chinese invention patent CN102776375A discloses a method for recovering rare earth from waste neodymium iron boron material. The method comprises the steps of firstly, finely grinding and crushing the neodymium iron boron waste materials, and then separating undissolved B elements by utilizing a hydrochloric acid preferential dissolution method; adjusting the pH value of the obtained liquid to 2.0-3.0 by using ammonia water; adding an ammonium sulfide solution into a water bath at 50-70 ℃, fully precipitating metal cation impurities under the action of ammonium sulfide, and reacting for more than 2.0 hours; performing centrifugal filtration, wherein the filtrate mainly contains rare earth ions and chloride ions; hydrochloric acid is added into the filtrate dropwise until no bubbles are generated, and the filtrate is heated for more than 10 min.
Chinese patent CN107794373A discloses a comprehensive treatment method of waste neodymium-iron-boron magnet. The method utilizes the acid solubility of neodymium iron boron, does not need strict granularity requirement (less than or equal to 5 mm), can completely dissolve neodymium iron boron waste magnetic materials in sulfuric acid solution, utilizes various differences of dissolved substances to separate rare earth from iron and nonferrous metal, recycles an oil phase through oil-water separation, separates rare earth into rare earth sulfate double salt precipitate and partial concentrate for rare earth to be used as raw materials, purifies the nonferrous metal into a sulfide-enriched product, and produces the iron oxide red pigment by an ammonia method when ferrous sulfate is in a solution state.
Therefore, some methods can avoid the problems of high energy consumption and tail gas caused by roasting by adding an oxidant or grinding, but the cost of the oxidant is additionally increased, the fine grinding has potential safety hazards, and strong acid cannot be used in most methods, so that a large amount of acidic wastewater can be generated.
The Chinese patent CN111154980A discloses an electrolytic regeneration method of neodymium iron boron waste solution. The method removes an anticorrosive layer on the surface of the neodymium iron boron disassembled waste, and then gathers the waste into a whole by virtue of the magnetism of the neodymium iron boron and uses the whole as an anode of an electrolysis system. During the electrolysis process, the anode is dissolved, and rare earth and iron ions enter the solution. Wherein, iron ions are leached out at the cathode to become high-purity iron; the rare earth elements are enriched in the electrolyte in an ionic state. And after the electrolysis is finished, recovering the rare earth elements in the electrolyte in a solvent extraction mode to produce rare earth oxides or further produce rare earth metals. The method can realize the separation and recovery of rare earth elements and iron elements, but needs a large amount of extra iron salts or rare earth salts as electrolyte, and has high cost.
Disclosure of Invention
The invention provides a method for strengthening the leaching reaction of a neodymium iron boron magnet by combining electrochemical anodic oxidation with an ionic flocculant, which improves the pretreatment process of a hydrochloric acid method, directly leaches metal ions in the neodymium iron boron magnet by adopting the method of combining electrochemical anodic oxidation with the flocculant, avoids a large amount of tail gas generated by high-temperature roasting, uses cheaper and easily obtained reagents to replace substances such as hydrochloric acid, oxalic acid and the like in electrolyte, reduces the discharge amount of acidic wastewater, and reduces the cost.
A method for leaching metal ions in a neodymium iron boron magnet by using a flocculating agent in combination with electrochemical anodic oxidation is characterized by comprising the following steps: taking the waste neodymium-iron-boron magnet as an anode and taking an inert conductive material as a cathode; adjusting the pH value by using sulfate or nitrate of sodium or potassium as electrolyte and dilute acid; adding a flocculating agent into the electrolyte for coagulation assistance; at room temperature, rare earth and iron elements in the neodymium iron boron waste magnet are converted into ions through electrolysis to enter a solution, and the ionic flocculating agent rapidly moves under the action of an electric field to react with metal ions, so that the metal ions are promoted to be precipitated, and the leaching reaction is strengthened; separating the deposit from the electrolyte after electrolysis, cleaning the deposit to obtain a recovered product, and recycling the electrolyte to the electrolysis process for reuse.
Further, the neodymium iron boron waste magnet includes but is not limited to neodymium iron boron cutting waste, sintering blank, unqualified product and neodymium iron boron waste formed by pressing fragments.
Further, the electrolyte is sulfate or nitrate of sodium or potassium, and the concentration is 0.1-0.5 mol.L -1 (ii) a The pH value of the electrolyte is adjusted to 3-7 by using dilute acid of the same kind as the salt solution.
Further, the flocculating agent added into the electrolyte comprises at least one of polyacrylamide, poly dimethyl diallyl ammonium chloride and starch polyacrylamide, and the amount of the flocculating agent can be selected according to the situation; the anionic flocculant can be combined with metal cations more effectively to promote the precipitation of the metal cations; in a preferred embodiment of the present invention, the flocculant is an anionic flocculant added in an amount of 10 to 30 g.L -1 。
Further, the current density is controlled between 30 and 200 mA-cm in the electrolysis process -2 。
Furthermore, the precipitate generated in the electrolytic process is composed of the mixed hydroxide of the rare earth and the iron, and the mixed hydroxide has a loose structure, so that the subsequent acid dissolution separation of the rare earth and the iron element is facilitated.
Further, the cathode is made of an inert conductive material, such as a graphite rod.
Further, the electrolyte is filtered to recover the precipitate, and then the electrolyte returns to the electrolysis process for recycling.
The method can be used for recovering the waste neodymium iron boron magnet, rare earth metal and iron are leached out in the electrolyte by electrolysis, the flocculating agent promotes the flocculation and precipitation of metal ions, and the subsequent centrifugal separation and recovery are carried out.
Compared with the prior art, the invention has the beneficial effects that:
(1) The organic polymer flocculant can be divided into four types of cations, anions, non-ions and amphiprotics, generally is a high polymer with a linear structure, the two ends of the line are respectively connected with micro particles, the bonding bridging effect is realized between two particles far away from each other, the particles with the reduced distance are easier to combine and gradually enlarge, and finally a large-particle flocculating constituent is formed to accelerate the particle sedimentation. After the flocculating agent is added in the electrolytic process, hydroxide colloid and dispersed particles suspended in the electrolyte can rapidly generate floccules under the interaction of molecular force, charged floccules rapidly move under the action of an electric field, the particles collide with each other in the sedimentation process for condensation, the size and the mass are continuously increased, the sedimentation velocity of the particles is also continuously increased, the leaching reaction is strengthened, and the recovery rate of rare earth elements and iron elements is greatly improved.
(2) According to the invention, the raw materials directly use the massive neodymium iron boron waste magnet to improve the recovery of rare earth elements by the electrochemical method, the purity requirement on the neodymium iron boron waste is not high, the waste does not need to be demagnetized, crushed, roasted and the like, the emission of a large amount of tail gas is avoided, and the cost is reduced.
(3) The invention combines the electrochemical anode oxidation technology with the flocculating agent, utilizes the rapid movement precipitation coupling of the anode oxidation and the ionic flocculating agent, takes the cheap and common salt as the electrolyte, avoids the use of strong acid, has little pollution and low cost, and improves the recovery rate of the rare earth element. ,
(4) The invention can recover the rare earth element by electrolyzing the solution at normal temperature, while the prior electrochemical rare earth recovery process generally needs to be carried out in high-temperature molten salt.
(5) The invention adopts cheap sulfate or nitrate of sodium or potassium as electrolyte which can be reused after being filtered, recovered and precipitated, while the existing electrolytic process for recovering rare earth adopts expensive sulfate or nitrate of iron or rare earth elements.
(6) The invention provides a pretreatment method of a rare earth recovery process, wherein the recovered product is a mixed hydroxide with a loose structure, so that the subsequent acid dissolution separation of rare earth elements and iron elements is facilitated, and the acid consumption can be greatly reduced.
Drawings
FIG. 1 is a scanning electron microscope image of the recovered product;
FIG. 2 is an elemental distribution diagram of the recovered product.
Detailed Description
Example 1
(1) Washing the massive waste of certain neodymium iron boron magnet with absolute ethyl alcohol and deionized water for three times, and drying the massive waste with an oven at 60 ℃. The main metal components (multiple measurement range values) are determined by ICP-OES as follows: 19.42 to 19.86 percent of neodymium, and 56.89 to 58.98 percent of iron; and taking a proper amount of the neodymium iron boron magnet blocky waste, weighing and recording. Taking the neodymium iron boron magnet blocky waste as an anode and a graphite rod as a cathode;
(2) 0.2 mol.L is prepared by anhydrous potassium sulfate -1 The solution of (2) is used as electrolyte, and the pH of the electrolyte is 7;
(3) Adding flocculating agent polyacrylamide into the electrolyte, wherein the adding amount is 10 g.L -1 ；
(4) And (5) building an electrolysis device. Pouring the prepared electrolyte into a clean and dried electrolytic tank, and inserting an electrode.
(5) Adjusting the temperature of the water bath kettle, and controlling the electrolysis temperature to be 25 ℃;
(6) Switching on a constant voltage power supply, maintaining the voltage at 2V, recording the start time of electrolysis, performing electrolysis for 20min, and controlling the fluctuation range of current density to 30-200 mA-cm during electrolysis -2 ；
(7) The electrolysis device is dismantled, and the anode neodymium iron boron waste is washed by deionized water, dried and weighed. Collecting the electrolyte, filtering, drying and weighing to obtain mixed hydroxide of neodymium and iron;
(8) And (3) according to analysis of ICP-OES components of the precipitates obtained by electrolysis, calculating the total amount of the recovered neodymium and iron elements, and then comparing the total amount of the recovered neodymium and iron elements with the electrolytic weight loss of the anode waste material to obtain the neodymium and iron recovery rates of 96.3% and 99.5% in the bulk waste material of the neodymium-iron-boron magnet respectively.
FIGS. 1 and 2 are a scanning electron microscope image and an elemental distribution map, respectively, of a recovered product; it can be seen from the figure that the recovered product of the invention is neodymium and iron mixed hydroxide with a loose structure, and due to the loose structure, the subsequent acid dissolution separation of rare earth elements and iron elements can be facilitated, and the acid consumption can be greatly reduced.
Example 2
(1) The sheet waste of certain neodymium iron boron generated by magnet collapse in the machining process is washed three times by absolute ethyl alcohol and deionized water and dried by using an oven at 60 ℃. The ICP-OES is utilized to determine the main metal components: 22.23% of neodymium, 64.07% of iron; and weighing and recording a proper amount of neodymium iron boron magnet flaky waste. The neodymium iron boron flaky waste is used as an anode, and a graphite rod is used as a cathode;
(2) 0.4 mol/L is prepared by anhydrous sodium sulfate -1 The solution of (2) is used as an electrolyte, and the pH of the electrolyte is 3;
(3) Adding flocculant poly dimethyl diallyl ammonium chloride into the electrolyte, wherein the adding amount is 30 g.L -1 ；
(4) And (5) building an electrolysis device. Pouring the prepared electrolyte into a clean and dried electrolytic tank, and inserting an electrode.
(5) Adjusting the temperature of the water bath kettle, and controlling the electrolysis temperature to be 25 ℃;
(6) Switching on a constant voltage power supply, keeping the voltage at 2V, recording the start time of electrolysis, and the fluctuation range of current density of 30-200 mA-cm during the electrolysis process -2 ；
(7) Removing the electrolytic device, centrifuging, washing, drying and weighing the precipitate in the electrolyte to obtain mixed hydroxide of neodymium and iron;
(8) And (3) according to analysis of ICP-OES components of precipitates obtained by electrolysis, calculating the total amount of recovered neodymium and iron elements, and then comparing the total amount of recovered neodymium and iron elements with the electrolytic weight loss of the anode waste to obtain the neodymium and iron recovery rates of 97.2% and 99.6% in the neodymium-iron-boron flaky waste respectively. The recovered product was observed for morphology and elemental analysis, again as a mixed hydroxide of neodymium and iron with a loose structure.
Example 3
(1) And (3) washing a certain neodymium iron boron waste magnet with absolute ethyl alcohol and deionized water for three times, and drying the magnet in an oven at the temperature of 60 ℃ to obtain the magnet with the mass of 0.2699g. The waste magnet comprises the following main metal components: 19.57% of neodymium and 57.84% of iron; taking a piece of neodymium iron boron waste magnet, taking the neodymium iron boron magnet blocky waste material as an anode, and taking a graphite rod as a cathode;
(2) 0.2 mol/L is prepared by anhydrous sodium sulfate -1 Solution of (2)As an electrolyte, the pH of the electrolyte is 7;
(3) And (5) building an electrolysis device. Pouring the prepared electrolyte into a clean and dried electrolytic tank, and inserting an electrode.
(4) Adjusting the temperature of the water bath kettle, and controlling the electrolysis temperature to be 25 ℃;
(5) Connecting the electrochemical workstation, maintaining the voltage at 2.5V, electrolyzing for 20min, and controlling the current density fluctuation range at 30-200 mA-cm during the electrolysis process -2 Recording the power consumption;
(6) The electrolysis device is dismantled, the anode neodymium iron boron waste is washed by deionized water, dried and weighed.
(7) The calculated Faraday efficiency of leaching the metal ions in the waste neodymium iron boron magnet by anodic oxidation is 97.3 percent.

Claims (2)

1. A method for strengthening leaching reaction of a neodymium iron boron magnet by combining electrochemical anodic oxidation with an ionic flocculant is characterized by comprising the following steps: the neodymium iron boron waste magnet is used as an anode, and an inert conductive material is used as a cathode; sulfate or nitrate of sodium or potassium is used as electrolyte, and the concentration of the electrolyte is 0.1 to 0.5 mol.L -1 Adjusting the pH value of the electrolyte to 3 to 7 by using dilute acid with the same anion type as the salt solution; adding an ionic flocculant into the electrolyte for coagulation assistance, wherein the ionic flocculant is at least one of polyacrylamide, poly dimethyl diallyl ammonium chloride and starch polyacrylamide, and the addition amount is 10-30 g.L -1 (ii) a At room temperature, rare earth and iron elements in the neodymium iron boron waste magnet are converted into ions through electrolysis and enter the solution, and the current density is controlled to be 30 to 200mA cm in the electrolysis process -2 (ii) a The ionic flocculating agent moves rapidly under an electric field to react with metal ions, so that the metal ions are promoted to precipitate, and the leaching reaction is strengthened; separating the deposit from the electrolyte after electrolysis, cleaning the deposit to obtain a recovered product, and recycling the electrolyte to the electrolysis process for reuse; the precipitate generated in the electrolytic process is composed of mixed hydroxide of rare earth and iron, and the mixed hydroxide has a loose structure and is beneficial to the subsequent acid dissolution separation of rare earth and iron elements.
2. The method for strengthening the leaching reaction of the neodymium iron boron magnet by combining the electrochemical anodic oxidation with the ionic flocculant according to claim 1, wherein the method comprises the following steps: the waste neodymium iron boron magnet comprises neodymium iron boron cutting waste, a sintered blank, unqualified products and neodymium iron boron waste formed by pressing fragments.
CN202110102614.0A 2021-01-26 2021-01-26 Method for strengthening leaching reaction of neodymium iron boron magnet by combining electrochemical anodic oxidation with ionic flocculant Active CN112941321B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110102614.0A CN112941321B (en) 2021-01-26 2021-01-26 Method for strengthening leaching reaction of neodymium iron boron magnet by combining electrochemical anodic oxidation with ionic flocculant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110102614.0A CN112941321B (en) 2021-01-26 2021-01-26 Method for strengthening leaching reaction of neodymium iron boron magnet by combining electrochemical anodic oxidation with ionic flocculant

Publications (2)

Publication Number Publication Date
CN112941321A CN112941321A (en) 2021-06-11
CN112941321B true CN112941321B (en) 2023-03-10

Family

ID=76236855

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110102614.0A Active CN112941321B (en) 2021-01-26 2021-01-26 Method for strengthening leaching reaction of neodymium iron boron magnet by combining electrochemical anodic oxidation with ionic flocculant

Country Status (1)

Country Link
CN (1) CN112941321B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113832348B (en) * 2021-09-18 2023-12-19 内蒙古大学 Method for recovering rare earth and cobalt element from rare earth permanent magnet mud-like waste
CN113846221B (en) * 2021-09-18 2023-05-30 内蒙古大学 Environment-friendly recycling method for neodymium-iron-boron alloy waste

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150047469A1 (en) * 2012-07-19 2015-02-19 Jx Nippon Mining & Metals Corporation Method for Recovering Rare Earth from Rare Earth Element-Containing Alloy
CN111485110A (en) * 2020-06-05 2020-08-04 中国林业科学研究院林产化学工业研究所 Method for improving utilization rate of valuable elements in rare earth

Also Published As

Publication number Publication date
CN112941321A (en) 2021-06-11

Similar Documents

Publication Publication Date Title
CN106756084B (en) Method for extracting noble metal by taking iron-based material as trapping agent
CN107196004B (en) A method of recycling valuable metal from applying waste lithium ionic power battery
CN102011020B (en) Method for recovering rare earth elements from neodymium-iron-boron wastes
CN112522527B (en) Electrolytic-based method for selectively recovering rare earth elements from Nd-Fe-B magnet scrap
CN110607537B (en) Method for synchronously and efficiently extracting rare earth and iron from high-value recycled neodymium iron boron waste
CN112941321B (en) Method for strengthening leaching reaction of neodymium iron boron magnet by combining electrochemical anodic oxidation with ionic flocculant
CN111154980B (en) Neodymium iron boron waste solution electrolytic regeneration method
CN102719674A (en) Method for extracting rare earth from oxidized neodymium iron boron waste
CN106848473A (en) A kind of selective recovery method of lithium in waste lithium iron phosphate battery
CN112110466B (en) Method for removing iron impurities in fly ash and intermediate product thereof
CN105219964A (en) A kind of processing method utilizing discarded nickel, copper tailings to reclaim nickel, copper
CN104388711A (en) Method for recovering rare earth by leaching rare earth oxide molten slag
Shi et al. Simultaneous and clean separation of titanium, iron, and alumina from coal fly ash in one spot: Electrolysis-hydrolysis method
CN105887118B (en) A kind of method that Selective Separation from materials containing tellurium reclaims tellurium
CN104674298A (en) Method for recycling and preparing high-purity nickel from recycled nickel-based high-temperature alloy material
JPH0380103A (en) Method for recovering sulfuric acid
CN106757156B (en) A method of from recycling Re in high-temperature alloy waste material containing Re
CN113846221B (en) Environment-friendly recycling method for neodymium-iron-boron alloy waste
CN110592378B (en) Method for recovering rare earth and iron from ultrafine powder waste generated in neodymium iron boron production process
CN113832348B (en) Method for recovering rare earth and cobalt element from rare earth permanent magnet mud-like waste
WO2024000970A1 (en) Method for extracting and recovering gold from aqueous solution
CN109536992A (en) A kind of method of two de- two products purifying copper electrolytes
CN103773953A (en) Method for gathering eluate with low rare earth concentration by adopting ionic exchange method
CN107794371A (en) It is a kind of to utilize discarded nickel, copper tailings recovery nickel, the process of copper
CN102234821A (en) Method for recovering and preparing superfine lead powder, zinc powder and pure lead ingots and zinc ingots from lead- and zinc-containing materials

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant