CN108193051A - A kind of neodymium iron boron powdered scrap room temperature wet method air, ozone secondary oxidation remove the device and method of iron - Google Patents
A kind of neodymium iron boron powdered scrap room temperature wet method air, ozone secondary oxidation remove the device and method of iron Download PDFInfo
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- CN108193051A CN108193051A CN201711459510.5A CN201711459510A CN108193051A CN 108193051 A CN108193051 A CN 108193051A CN 201711459510 A CN201711459510 A CN 201711459510A CN 108193051 A CN108193051 A CN 108193051A
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- 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
- C22B7/007—Wet processes by acid leaching
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- 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
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/02—Apparatus therefor
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- 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
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
- C22B3/44—Treatment or purification of solutions, e.g. obtained by leaching by chemical processes
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- 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
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- 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
A kind of neodymium iron boron powdered scrap room temperature wet method air, ozone secondary oxidation remove the device and method of iron, are related to METAL EXTRACTION method.Its equipment mainly includes Rinsing Area（1）, dissolving tank（3）, air oxidation tank（4）, ozone oxidation tank（5）, sedimentation basin（6）, air pump（10）And ozone generating-device（11）, except the step of iron is that neodymium iron boron powdered scrap is added to dissolving tank（3）Feed liquid containing rare earth element and main component are Fe (OH) by sedimentation basin by middle dissolving, then aoxidized successively by air oxidation tank and ozone oxidation tank3It is detached with the filter residue of FeO (OH).The present invention saves production cost, is conducive to improve the purity of institute's recovering rare earth element, and low energy consumption, and with higher environmental benefit.
Description
Technical field
The invention belongs to technical field of resource recovery, and in particular to a kind of METAL EXTRACTION method.
Background technology
Neodymium iron boron (NdFeB) because of its excellent ferromagnetism, as third generation permanent-magnet material be widely used in electronic information,
The various fields such as engine manufacture, national defence.China is NdFeB material big producer, neodymium iron boron yield in 2013 up to 9.4 ten thousand tons,
Account for the 91% of global total output.And the waste material for accounting for about raw material weight 30%-40% can be generated in neodymium iron boron produces whole process.It burns
Each step of neodymium iron boron production and processing is tied all inevitable that the generation of waste material.Wherein powdered scrap includes：(1) powder processed
Gradation is carried out in the process, can generate some clasts；(2) clinker generated in sintering process；(3) it is produced in some processes
The granulated slag that raw defect ware is formed after severe oxidation.The mass fraction of iron (Fe) accounts for about 35%-55%, rare earth element in waste material
Mass fraction account for about 15%-30%.It is domestic simultaneously that Rare-earth Mine, random mining so that resource loss is serious for many years.So
Recovering rare earth element is of great significance to the utilization of resources, environmental protection in neodymium iron boron waste material.
Recovering rare earth element mainly uses from neodymium iron boron waste material, such as the molten depositing technology of acid, double salt conversion process, it is complete it is molten-
The hydrometallurgical processes such as extraction, and how to be the recovering rare earth element from neodymium iron boron powdered scrap by Fe and rare earths separation
It is crucial.In hydrometallurgy, the principle of Fe elements and rare earths separation is, by simple substance Fe or ferrous iron (Fe2+) it is oxidized to trivalent
Iron (Fe3+), control solution ph is in the range of 3.0~4.5, Fe in solution3+Basic generation hydroxide precipitation, and neodymium, dysprosium etc.
Rare earth element does not generate precipitation substantially, so as to achieve the purpose that except iron.Has the method that Fe is removed from neodymium iron boron waste material at present
Mainly there is salt Ore Leaching-hydrogen peroxide (H2O2) oxidizing process, molten method, the oxidizing roasting-hydrochloric acid decomposition method entirely of autoxidation-hydrochloric acid
Deng.Salt Ore Leaching-H2O2It is oxidizing process good iron removal effect, with short production cycle, but reagent consumption amount is big, production cost is high.Produce nature
Oxidation-hydrochloric acid entirely molten method because production cost it is low, simple for process, be most widely used at present, but this method production cycle is long, takes up an area
Area is big, generally after hydrochloric acid (HCl) solution-wet raw material is used, need to place in air 20 days or so, and it is natural to carry out air
Fe is largely oxidized to Fe by oxidation processes3+.Oxidizing roasting-hydrochloric acid decomposition method production cycle is shorter, but needs in 700 DEG C of conditions
Fe in waste material is largely oxidized to Fe in 1.5 hours or so by lower roasting3+, energy-output ratio is big, and in high-temperature oxidation process, carefully
Particle is easily mutually bonded together, and causes oxidation incomplete.What is more important, due to containing centainly organic in waste material
Object, therefore autoxidation processing and oxidizing roasting method are all more there is exhaust gas is generated in production process, easily cause two to air
The shortcomings that secondary pollution.With the enhancing of people's environmental consciousness and new《The Law of the People's Republic of China on the Prevention and Control of Atmospheric Pollution》(2015
August second is revised) execution, the cost of exhaust-gas treatment and discharge further improves, and the deficiency of existing method becomes more to show
It writes.Therefore seek a kind of neodymium iron boron waste material of green economy environmental protection except the method for iron is imperative.
Invention content
The technical problem to be solved in the present invention is to provide a kind of neodymium iron boron powdered scrap room temperature wet method air, ozone two level oxygen
The equipment for eliminating iron.
The invention also discloses the methods that iron is removed using this equipment.
Present device is mainly by Rinsing Area (1), dissolving tank (3), air oxidation tank (4), ozone oxidation tank (5), precipitation
Pond (6), air pump (10) and ozone generating-device (11) composition, Rinsing Area (1) is higher than dissolving tank (3), Rinsing Area (1) lower part
The top of dissolving tank (3) is connected by water pipe, is pushed up on water pipe equipped with inlet valve (3-1), dissolving tank (3) to seal container
End is connected with acid-adding port (2) by pipeline, and acid adding valve (3-2) is equipped on pipeline, has blender (3- inside dissolving tank (3)
3), there is feeding port (3-5) on the sealing cover (8) of dissolving tank (3), flue gas leading (1-1), flue gas leading are connected on sealing cover (8)
The other end of (1-1) is passed through Rinsing Area (1) bottom, and dissolving tank (3) bottom connects air oxidation tank by drain pipe (4-1)
(4) top, tapping valve (3-4) and filter press (12) are sequentially installed on drain pipe (4-1), and air oxidation tank (4) is opening
Container, top is connected with by pipeline plus alkali tank (7), and alkali addition valve (4-4), the bottom of air oxidation tank (4) are equipped on pipeline
Portion is equipped with air aeration device (4-3), and air aeration device (4-3) is connected with air pump (10), air aeration device (4-3) and air
There is intake valve (4-2) between pump (10), air oxidation tank (4) is equipped with blender (4-5), and air aeration tank (4) bottom passes through
Pipeline connects ozone oxidation tank top (5), fluid-delivery valve (5-1) is equipped on pipeline, ozone oxidation tank (5) is seals
Container, bottom are equipped with ozonation aerated device (5-3), and ozonation aerated device (5-3) connects ozone by air delivery valve (5-2) and fills
It puts (11), is connected with activated carbon adsorption device (9) at the top of ozone oxidation tank (5), ozone oxidation tank (5) bottom is connected by pipeline
Sedimentation basin (6) is equipped with fluid-delivery valve (6-1) on pipeline, and sedimentation basin (6) lower part is equipped with tapping valve (6-2), and bottom is equipped with
Residual cake valve (6-3).
Present invention solves the technical problem that scheme include the following steps：
1st, acid is molten：Feeding port (3-5) is opened, neodymium iron boron powdered scrap is added in dissolving tank (3), closes feeding port
(3-5) opens acid adding valve (3-2) and acid solution is added in into dissolving tank (3), while turn on agitator (3-3) is stirred, dissolve neodymium
Iron boron powdered scrap makes iron and rare earth element be converted into rare earth ion (RE3+) and ferrous ion (Fe2+) enter in solution, it is molten
After solving 30min, open inlet valve (3-1) and water dilution feed liquid is added in into dissolving tank (3), be diluted to pH after 4.0-4.5, close
Blender (3-3) and inlet valve (3-1) open tapping valve (3-4), and feed liquid is discharged into filter press through tapping valve (3-4) after dilution
(12) press filtration obtains filtrate and residue, and filtrate is discharged into air oxidation tank (4) through pipeline (4-1) again, and filter residue passes through feeding port (3-5)
It is added in dissolving tank (3), is dissolved again by aforesaid operations, and enter filter press (12) press filtration, filtrate is combined into
Air oxidation tank (4), residue are the impurity such as silicon compound insoluble in acid in waste material, discard, control entire course of dissolution acid adding
And amount of water, make after merging that filtrate rare earth element concentration is 15-20g/L in air oxidation tank (4), pH is in 4.0-4.5, dissolving
What is generated in the process is passed through Rinsing Area (1) bottom by flue gas leading (1-1) containing sour waste gas and is absorbed with water.The acid solution recommendation makes
Use concentrated hydrochloric acid.
2nd, main air aoxidizes：Turn on agitator (4-5), air pump (10) simultaneously open intake valve (4-2), to step (1)
Air is passed through in the feed liquid obtained, pH in aeration process is monitored and fluctuates, and open alkali addition valve (4-4), add in lye and adjust pH
Between 5.0-5.5, it is continuously passed through air 4-5 hours, it can be under normal temperature condition by the Fe of 80-90% in feed liquid2+It is oxidized to
For goethite (FeO (OH)) and a small amount of ferric hydroxide colloid (Fe (OH)3).The lye recommends ammonium hydroxide (NH4·H2O) or
Sodium hydroxide (NaOH).
3rd, secondary ozone aoxidizes：Blender (4-5), air pump (10) and intake valve (4-2) are closed, opens fluid-delivery valve (5-
1), step (2) formation suspension is discharged into ozone oxidation tank (5), is then shut off fluid-delivery valve (5-1), ozone is opened and fills
(11) are put, and open air delivery valve (5-2), it is 10-15g/hL (i.e. 10-15 grams per hour of every liter of feed liquid to control ozonation aerated amount
Ozone), ozone 30-50min is passed through into ozone oxidation tank (5), aoxidizes residual F e in solution2+, with Fe2+Oxidation solution
PH is reduced, and finally drops to 1.0-2.0, and under the conditions of this pH, a small amount of rare earth hydrate colloid formed in step (2) can be molten
Solution, is re-introduced into solution.Exhaust gas is absorbed by activated carbon adsorption device (9) in oxidation process.
4th, removal of impurities is neutralized：Ozone generating-device (11) and air delivery valve (5-2) are closed, opens tapping valve (6-1), ozone oxidation
Feed liquid enters sedimentation basin (6) in tank (5), adds in lye and adjusts pH to 3.5-4.0, makes Fe in solution3+Precipitation, the lye are recommended
Use ammonium hydroxide (NH4·H2) or sodium hydroxide (NaOH) O.
5th, it detaches：Tapping valve (6-2) is opened, supernatant is discharged by tapping valve (6-2), opens residual cake valve (6-3), precipitation
It is discharged by residual cake valve (6-3), then press filtration obtains filtrate and filter residue, with appropriate pure water filter residue.Cleaning solution, filtrate and supernatant
Liquid merges, and the extraction and separation of rare earth element can be used for as feed liquid.Filter residue main component is Fe (OH)3, can export trade.
The beneficial effects of the present invention are：
1st, in the air oxidation iron removal, major part Fe in air oxidation solution2+, ozone usage 80- can be saved
90%, save production cost.It is aoxidized using ozone instead of chemical agent, strong (the oxidation point position of one side ozone oxidation
2.07V), oxidation effectiveness is good；On the other hand the introducing of impurity can be reduced, is conducive to improve the purity of institute's recovering rare earth element.
2nd, the production process carries out at normal temperatures, reduces energy consumption.
3rd, it is discharged in the production process without secondary pollutions such as exhaust gas, there is higher environmental benefit.
Description of the drawings
Fig. 1 is apparatus of the present invention schematic diagram；
Fig. 2 is present invention process flow chart.
Specific embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.
Embodiment：
Present invention raw material to be processed is the powder scrap that sintered NdFeB generates in the process.Waste material constituent is shown in Table
1, waste material rare earth elements composition is shown in Table 2.
The component part of 1 neodymium iron boron waste material of table
2 neodymium iron boron waste material middle rare earth component part of table
Present device is mainly by Rinsing Area (1), dissolving tank (3), air oxidation tank (4), ozone oxidation tank (5), precipitation
Pond (6), air pump (10) and ozone generating-device (11) composition, Rinsing Area (1) is higher than dissolving tank (3), Rinsing Area (1) lower part
The top of dissolving tank (3) is connected by water pipe, is pushed up on water pipe equipped with inlet valve (3-1), dissolving tank (3) to seal container
End is connected with acid-adding port (2) by pipeline, and acid adding valve (3-2) is equipped on pipeline, has blender (3- inside dissolving tank (3)
3), there is feeding port (3-5) on the sealing cover 8 of dissolving tank (3), flue gas leading (1-1), flue gas leading (1-1) are connected on sealing cover 8
The other end be passed through Rinsing Area (1) bottom, dissolving tank (3) bottom connects the upper of air oxidation tank (4) by drain pipe (4-1)
Portion, is sequentially installed with tapping valve (3-4) and filter press (12) on drain pipe (4-1), and air oxidation tank (4) is open-top receptacle, top
End is connected with by pipeline plus alkali tank (7), is equipped with alkali addition valve (4-4) on pipeline, the bottom of air oxidation tank (4) is equipped with
Air aeration device (4-3), air aeration device (4-3) are connected with air pump (10), air aeration device (4-3) and air pump (10) it
Between have intake valve (4-2), air oxidation tank (4) is equipped with blender (4-5), and air aeration tank (4) bottom is connected by pipeline
Ozone oxidation tank top (5) is equipped with fluid-delivery valve (5-1) on pipeline, and ozone oxidation tank (5) is seals container, bottom
Ozonation aerated device (5-3) is installed, ozonation aerated device (5-3) connects ozone generating-device (11) by air delivery valve (5-2), smelly
Activated carbon adsorption device (9) is connected at the top of oxygen oxidation tank (5), ozone oxidation tank (5) bottom connects sedimentation basin by pipeline
(6), fluid-delivery valve (6-1) is installed, sedimentation basin (6) lower part is equipped with tapping valve (6-2), and bottom is equipped with residual cake valve on pipeline
(6-3)。
Present invention solves the technical problem that scheme include the following steps：
1st, acid is molten：Feeding port (3-5) is opened, neodymium iron boron powdered scrap is added in dissolving tank (3), closes feeding port
(3-5) opens acid adding valve (3-2) and acid solution is added in into dissolving tank (3), while turn on agitator (3-3) is stirred, dissolve neodymium
Iron boron powdered scrap makes iron and rare earth element be converted into rare earth ion (RE3+) and ferrous ion (Fe2+) enter in solution, it is molten
After solving 30min, open inlet valve (3-1) and water dilution feed liquid is added in into dissolving tank (3), be diluted to pH after 4.0-4.5, close
Blender (3-3) and inlet valve (3-1) open tapping valve (3-4), and feed liquid is discharged into filter press through tapping valve (3-4) after dilution
(12) press filtration obtains filtrate and residue, and filtrate is discharged into air oxidation tank (4) through pipeline (4-1) again, and filter residue passes through feeding port (3-5)
It is added in dissolving tank (3), is dissolved again by aforesaid operations, and enter filter press (12) press filtration, filtrate is combined into
Air oxidation tank (4), residue are the impurity such as silicon compound insoluble in acid in waste material, discard, control entire course of dissolution acid adding
And amount of water, make after merging that filtrate rare earth element concentration is 15-20g/L in air oxidation tank (4), pH is in 4.0-4.5, dissolving
What is generated in the process is passed through Rinsing Area (1) bottom by flue gas leading (1-1) containing sour waste gas and is absorbed with water.The acid solution recommendation makes
Use concentrated hydrochloric acid.
2nd, main air aoxidizes：Turn on agitator (4-5), air pump (10) simultaneously open intake valve (4-2), to step (1)
Air is passed through in the feed liquid obtained, pH in aeration process is monitored and fluctuates, and open alkali addition valve (4-4), add in lye and adjust pH
5.5, it is continuously passed through air 4 hours, it can be under normal temperature condition by the Fe of 80-90% in feed liquid2+It is oxidized into goethite
(FeO (OH)) and a small amount of ferric hydroxide colloid (Fe (OH)3).The lye recommends ammonium hydroxide (NH4·H2) or sodium hydroxide O
(NaOH)。
3rd, secondary ozone aoxidizes：Blender (4-5), air pump (10) and intake valve (4-2) are closed, opens fluid-delivery valve (5-
1), step (2) formation suspension is discharged into ozone oxidation tank (5), is then shut off fluid-delivery valve (5-1), ozone is opened and fills
(11) are put, and open air delivery valve (5-2), control ozonation aerated amount as 12g/hL (i.e. every liter of feed liquid per hour 12 grams of ozone),
Ozone 30-50min is passed through into ozone oxidation tank (5), aoxidizes residual F e in solution2+, with Fe2+Oxidation solution pH reduce,
Finally drop to 1.5, under the conditions of this pH, a small amount of rare earth hydrate colloid formed in step (2) can be dissolved, again into
Enter into solution.Exhaust gas is absorbed by activated carbon adsorption device (9) in oxidation process.
In 4 and clean：Ozone generating-device (11) and air delivery valve (5-2) are closed, opens tapping valve (6-1), ozone oxidation
Feed liquid enters sedimentation basin (6) in tank (5), adds in lye and adjusts pH to 4.0, makes Fe in solution3+Precipitation, the lye recommend
Ammonium hydroxide (NH4·H2) or sodium hydroxide (NaOH) O.
5th, it detaches：Tapping valve (6-2) is opened, supernatant is discharged by tapping valve (6-2), opens residual cake valve (6-3), precipitation
It is discharged by residual cake valve (6-3), then press filtration obtains filtrate and filter residue, with appropriate pure water filter residue.Cleaning solution, filtrate and supernatant
Liquid merges, and the extraction and separation of rare earth element can be used for as feed liquid.Filter residue main component is Fe (OH)3, can export trade.
Claims (2)
1. a kind of equipment that neodymium iron boron powdered scrap room temperature wet method air, ozone secondary oxidation remove iron, it is characterised in that：It is by clear
Sink（1）, dissolving tank（3）, air oxidation tank（4）, ozone oxidation tank（5）, sedimentation basin（6）, air pump（10）Occur with ozone
Device（11）Composition, Rinsing Area（1）Higher than dissolving tank（3）, Rinsing Area（1）Lower part connects dissolving tank by water pipe（3）Top,
Inlet valve is housed on water pipe（3-1）, dissolving tank（3）To seal container, top is connected with acid-adding port by pipeline（2）,
Acid adding valve is installed on pipeline（3-2）, dissolving tank（3）There is blender in inside（3-3）, dissolving tank（3）Sealing cover 8 on feed intake
Mouthful（3-5）, flue gas leading is connected on sealing cover 8（1-1）, flue gas leading（1-1）The other end be passed through Rinsing Area（1）Bottom, dissolving
Pond（3）Bottom passes through drain pipe（4-1）Connect air oxidation tank（4）Top, drain pipe（4-1）On be sequentially installed with tapping valve
（3-4）And filter press（12）, air oxidation tank（4）For open-top receptacle, top is connected with by pipeline plus alkali tank（7）, pipeline
On alkali addition valve is installed（4-4）, air oxidation tank（4）Bottom air aeration device is installed（4-3）, air aeration device（4-3）
It is connected with air pump（10）, air aeration device（4-3）With air pump（10）Between have intake valve（4-2）, air oxidation tank（4）Peace
Equipped with blender（4-5）, air aeration tank（4）Bottom connects ozone oxidation tank top by pipeline（5）, it is equipped on pipeline
Fluid-delivery valve（5-1）, ozone oxidation tank（5）To seal container, bottom is equipped with ozonation aerated device（5-3）, ozonation aerated device
（5-3）Pass through air delivery valve（5-2）Connect ozone generating-device（11）, ozone oxidation tank（5）Top is connected with activated carbon adsorption dress
It puts（9）, ozone oxidation tank（5）Bottom connects sedimentation basin by pipeline（6）, fluid-delivery valve is installed on pipeline（6-1）, sedimentation basin
（6）Lower part is equipped with tapping valve（6-2）, bottom is equipped with residual cake valve（6-3）.
2. equipment according to claim 1, it is characterised in that process includes the following steps：
1）, acid it is molten：Open feeding port（3-5）, neodymium iron boron powdered scrap is added to dissolving tank（3）In, close feeding port（3-
5）, open acid adding valve（3-2）To dissolving tank（3）Middle addition acid solution, while turn on agitator（3-3）It is stirred, dissolves 30min
Afterwards, inlet valve is opened（3-1）To dissolving tank（3）Middle addition water dilution feed liquid, is diluted to pH after 4.0-4.5, closes blender
（3-3）And inlet valve（3-1）, open tapping valve（3-4）, feed liquid is through tapping valve after dilution（3-4）It is discharged into filter press（12）Press filtration,
Filtrate and residue are obtained, filtrate is again through pipeline（4-1）It is discharged into air oxidation tank（4）, filter residue passes through feeding port（3-5）It is added to dissolving
Pond（3）In, it is dissolved again by aforesaid operations, and enter filter press（12）Press filtration, filtrate are combined into air oxidation tank
（4）, residue is the impurity such as silicon compound insoluble in acid in waste material, discards, controls entire course of dissolution acid adding and amount of water, make
Air oxidation tank after merging（4）Middle filtrate rare earth element concentration is 15-20g/L, what pH was generated in 4.0-4.5, course of dissolution
Pass through flue gas leading containing sour waste gas（1-1）It is passed through Rinsing Area（1）Bottom is absorbed with water, and the acid solution recommends concentrated hydrochloric acid；
2）, main air oxidation：Turn on agitator（4-5）, air pump（10）And open intake valve（4-2）, to step（1）It is obtained
Air is passed through in the feed liquid obtained, pH in aeration process is monitored and fluctuates, and open alkali addition valve（4-4）, add in lye adjusting pH and exist
Between 5.0-5.5, it is continuously passed through air 4-5 hours, the lye recommends ammonium hydroxide or sodium hydroxide；
3）, secondary ozone oxidation：Close blender（4-5）, air pump（10）And intake valve（4-2）, open fluid-delivery valve（5-1）,
By step 2）It forms suspension and is discharged into ozone oxidation tank（5）It is interior, it is then shut off fluid-delivery valve（5-1）, open ozone generating-device
（11）, and open air delivery valve（5-2）, ozonation aerated amount is controlled as 10-15g/hL, to ozone oxidation tank（5）In be passed through ozone
30-50 min, pH are reduced between 1.0-2.0；
4）, neutralize removal of impurities：Close ozone generating-device（11）And air delivery valve（5-2）, open tapping valve（6-1）, ozone oxidation tank
（5）Middle feed liquid enters sedimentation basin（6）, add in lye and adjust pH to 3.5-4.0, the lye recommends ammonium hydroxide or hydroxide
Sodium；
5）, separation：Open tapping valve（6-2）, supernatant passes through tapping valve（6-2）Residual cake valve is opened in discharge（6-3）, precipitate logical
Cross residual cake valve（6-3）Discharge, then press filtration obtains filtrate and filter residue, with appropriate pure water filter residue, cleaning solution, filtrate and supernatant
Merge.
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| CN201711459510.5A CN108193051A (en) | 2017-12-28 | 2017-12-28 | A kind of neodymium iron boron powdered scrap room temperature wet method air, ozone secondary oxidation remove the device and method of iron |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109593977A (en) * | 2018-11-07 | 2019-04-09 | 东北师范大学 | A method of removal is containing iron ion in neodymium, praseodymium, dysprosium and ferrous solution |
| CN115583748A (en) * | 2022-10-09 | 2023-01-10 | 贵州大学 | Combined treatment method of barium slag leachate and acidic mine wastewater |
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| CN109593977B (en) * | 2018-11-07 | 2021-11-23 | 东北师范大学 | Method for removing iron ions in neodymium, praseodymium, dysprosium and iron-containing solution |
| CN115583748A (en) * | 2022-10-09 | 2023-01-10 | 贵州大学 | Combined treatment method of barium slag leachate and acidic mine wastewater |
| CN115583748B (en) * | 2022-10-09 | 2023-09-22 | 贵州大学 | Combined treatment method for barium slag leachate and acid mine wastewater |
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