CN109252058A - A kind of method that oxalic acid precipitation RE waste water recycles - Google Patents
A kind of method that oxalic acid precipitation RE waste water recycles Download PDFInfo
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- CN109252058A CN109252058A CN201811218635.3A CN201811218635A CN109252058A CN 109252058 A CN109252058 A CN 109252058A CN 201811218635 A CN201811218635 A CN 201811218635A CN 109252058 A CN109252058 A CN 109252058A
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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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- 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
- C22B3/04—Extraction of metal compounds from ores or concentrates by wet processes by leaching
- C22B3/12—Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic alkaline solutions
- C22B3/14—Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic alkaline solutions containing ammonia or ammonium salts
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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
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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
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- Y02P10/20—Recycling
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Abstract
The present invention relates to a kind of methods that oxalic acid precipitation RE waste water recycles, this method includes wastewater collection, detection, oxalic acid precipitation, separation of solid and liquid, ore leachate preparation, leaching mine, oxalic acid precipitation RE waste water by that will contain oxalic acid occurs precipitation reaction with the extraction wastewater containing rare earth element and removes oxalic acid, then it is separated by solid-liquid separation and obtains the acid waste water without oxalic acid, (NH is added in acid waste water4)2SO4Leaching mine of the ore leachate for Rare Earth Mine is obtained, realizes the recycling of oxalic acid precipitation RE waste water mesoxalic acid and hydrochloric acid containing oxalic acid.The present invention realizes the recycling of the oxalic acid precipitation RE waste water containing oxalic acid and the extraction wastewater containing rare earth element simultaneously, avoid the wasting of resources and contaminated wastewater, the purchase cost of ore leachate acid reagent, with good economic efficiency, social benefit and environmental benefit have been saved simultaneously.
Description
Technical field
The invention belongs to RE waste water process fields, and in particular to a kind of method that oxalic acid precipitation RE waste water recycles.
Background technique
China is rare earth resources big country, and yield ranks first in the world.Rare earth element has excellent due to its special structure of matter
Different physics, chemistry, magnetic, light and electric property has extremely wide purposes, the referred to as strategic element of 21 century.With
People are abundant and cheap to the continuous research of rare earth element performance and application and understanding and by China's rare earth resources
Advantage, rare earth are just protected in China's household electrical appliance, daily-use chemical industry, Ferrous Metallurgy, petrochemical industry, laser technology, superconductor, medical treatment
Strong, agriculture and forestry and environmental protection etc. have been more and more widely used in fields.Rare-earth extraction separating process process can be divided into three
A aspect, i.e. feed liquid pre-treatment, solvent extraction and separation process and product finishing post-processing.Feed liquid pre-treatment is to be put into concentrate
Acidleach is carried out in sulfuric acid, then through processes such as dissolution, separation, purification, concentration or calcinations, various mixed rare earth compounds is made and produce
Product；Solvent extraction and separation be mixed rare earth solution is separated, is enriched with, extract obtain required purity and yield rare earth produce
Product；Post-processing is to obtain extraction separation process single rare earth product obtained finally by processes such as precipitating, filtering, roastings
Solid product, i.e. rare earth oxide.
During Rare Earth Production, the waste water that oxalic acid precipitation rare-earth process generates contains oxalic acid, hydrochloric acid etc., and it is useless to belong to peracidity
Water, the requirement that general processing method is unable to reach oxalic acid, hydrochloric acid sufficiently recycles, while wastewater treatment be not up to standard can be to water
Body causes very big pollution.
Rare Earth Mine generallys use (NH4)2SO4Rare earth element is slightly put forward as ore leachate, rare earth element ion is in acidity
Under the conditions of by with NH4 +Exchange occurs and is leached in ore leachate.Sulfuric acid, the hydrochloric acid etc. that enterprise generally takes addition to be commercialized
Acid (the NH of acid reagent preparation4)2SO4Ore leachate virtually increases production cost.
Therefore, after removal oxalic acid being recycled containing the RE waste water of oxalic acid, hydrochloric acid, ore leachate is prepared using its acidity, no
The processing problem that only can solve waste water, can also save enterprise's production cost, have good development prospect.
Summary of the invention
The purpose of the present invention is overcome the deficiencies of the prior art and provide a kind of side that oxalic acid precipitation RE waste water recycles
Method.
The present invention realizes in the following way:
A kind of method that oxalic acid precipitation RE waste water recycles, comprising the following steps:
(1) wastewater collection: by the acid oxalic acid precipitation RE waste water containing oxalic acid, the extraction wastewater containing rare earth element is collected respectively
To different ground catch basins；
(2) it detects: detecting the substance withdrawl syndrome of the oxalic acid precipitation RE waste water mesoxalic acid containing oxalic acid respectively and containing rare earth element
Extraction wastewater in rare earth element substance withdrawl syndrome；
(3) oxalic acid precipitation: according to the testing result of step (2), control volume ratio by containing oxalic acid oxalic acid precipitation RE waste water and
Extraction wastewater containing rare earth element imports agitating reaction pond, opens stirring 10-30 min, after the completion of precipitation reaction, keeps mixing useless
The substance withdrawl syndrome of water mesoxalic acid is 0-0.0001 mol/L, and the substance withdrawl syndrome of rare earth element is 0.0001-0.001
Mol/L realizes the purpose of removal RE waste water mesoxalic acid；
(4) it is separated by solid-liquid separation: the composite waste after the completion of precipitation reaction being introduced into solid-liquid separation tank, composite waste is in solid-liquid separation tank
It is inside separated by solid-liquid separation from top to bottom, the first drainage plate is flowed by skirt first, has filter cartridge, composite waste on the first drainage plate
Filter cartridge carry out first time separation of solid and liquid, then through the second drainage plate flow into filter mechanism, composite waste filter mechanism into
Second of separation of solid and liquid of row realizes that solid-liquid is kept completely separate, filter residue is heavy for oxalic acid finally by being separated by solid-liquid separation the filter plate of bottom of pond portion
Shallow lake rare earth, is used to prepare rare-earth products, and filtrate is the acid waste water without oxalic acid；
(5) prepared by ore leachate: (NH being added in acid waste water4)2SO4, adjusting pH value is 4-5, obtains acid (NH4)2SO4Leaching
Mine liquid；
(6) mine is soaked: by acid (NH4)2SO4Ore leachate soaks mine, under acid condition, rare earth element ion and NH for Rare Earth Mine4 +Exchange occurs and is leached in ore leachate, realizes that the oxalic acid precipitation RE waste water containing oxalic acid recycles.
Preferably, the substance withdrawl syndrome of the oxalic acid precipitation RE waste water mesoxalic acid containing oxalic acid is 0.05-0.3
mol/L。
Preferably, pH is 1-2 in the oxalic acid precipitation RE waste water containing oxalic acid.
Preferably, the oxalic acid precipitation RE waste water containing oxalic acid includes oxalic acid precipitation rare earth mother solution waste water, oxalic acid precipitation
Rare earth washes.
Preferably, the substance withdrawl syndrome of rare earth element is 0.008-0.01 in the extraction wastewater containing rare earth element
mol/L。
Preferably, in step (3), after the completion of precipitation reaction, make the substance withdrawl syndrome 0- of composite waste mesoxalic acid
0.00005 mol/L, the substance withdrawl syndrome of rare earth element are 0.0005-0.001 mol/L.
Preferably, the described (NH4)2SO4NH in ore leachate4 +Mass percent be 2-5%.
Preferably, the described (NH4)2SO4NH in ore leachate4 +Mass percent be 4.5%.
Preferably, the described (NH4)2SO4The pH value of ore leachate is 4.
The beneficial effects of the present invention are:
1. the present invention can to containing oxalic acid oxalic acid precipitation RE waste water mesoxalic acid and hydrochloric acid reuse again, avoid oxalic acid
With the hydrochloric acid wasting of resources and contaminated wastewater.
2. the present invention can precipitate again recycling to the rare earth element in the extraction wastewater containing rare earth element, rare earth is avoided
The wasting of resources and extraction wastewater pollution.
3. reducing Rare Earth Production cost present invention saves the buying of ore leachate acid reagent.
4. solid-liquid separating method of the invention is Dynamic Separation method, avoid in traditional settled process solid-liquid layering low efficiency,
The defect of inferior separating effect, and be automatically separated from high to low using gravitional force, save energy consumption.
5. the present invention improves the recycling and utilization rate of each resource in Rare Earth Production, mitigate waste water treatment cost, and operate
Simply, low in cost, with good economic efficiency and social benefit.
Specific embodiment
The invention will be further described combined with specific embodiments below, but does not limit the scope of the invention and apply
Range.
Embodiment 1
A kind of method that oxalic acid precipitation RE waste water recycles, comprising the following steps:
(1) wastewater collection: by the acid oxalic acid precipitation RE waste water containing oxalic acid, the extraction wastewater containing rare earth element is collected respectively
To different ground catch basins；PH is 2 in the oxalic acid precipitation RE waste water containing oxalic acid, including oxalic acid precipitation rare earth mother solution is useless
Water, oxalic acid precipitation rare earth washes；
(2) it detects: detecting the substance withdrawl syndrome of the oxalic acid precipitation RE waste water mesoxalic acid containing oxalic acid respectively and containing rare earth element
Extraction wastewater in rare earth element substance withdrawl syndrome；The substance withdrawl syndrome of its mesoxalic acid is 0.3 mol/L, rare earth element
Substance withdrawl syndrome be 0.01 mol/L；
(3) oxalic acid precipitation: according to the testing result of step (2), control volume ratio by containing oxalic acid oxalic acid precipitation RE waste water and
Extraction wastewater containing rare earth element imports agitating reaction pond, opens 20 min of stirring, after the completion of precipitation reaction, makes in composite waste
The substance withdrawl syndrome of oxalic acid is 0.00001 mol/L, and the substance withdrawl syndrome of rare earth element is 0.0005 mol/L, and realization is gone
Except the purpose of RE waste water mesoxalic acid；
(4) it is separated by solid-liquid separation: the composite waste after the completion of precipitation reaction being introduced into solid-liquid separation tank, composite waste is in solid-liquid separation tank
It is inside separated by solid-liquid separation from top to bottom, the first drainage plate is flowed by skirt first, has filter cartridge, composite waste on the first drainage plate
Filter cartridge carry out first time separation of solid and liquid, then through the second drainage plate flow into filter mechanism, composite waste filter mechanism into
Second of separation of solid and liquid of row realizes that solid-liquid is kept completely separate, filter residue is heavy for oxalic acid finally by being separated by solid-liquid separation the filter plate of bottom of pond portion
Shallow lake rare earth, is used to prepare rare-earth products, and filtrate is the acid waste water without oxalic acid；
(5) prepared by ore leachate: (NH being added in acid waste water4)2SO4To NH4 +Mass percent be 4.5%, adjust pH value be
4, obtain acid (NH4)2SO4Ore leachate；
(6) mine is soaked: by acid (NH4)2SO4Ore leachate soaks mine, under acid condition, rare earth element ion and NH for Rare Earth Mine4 +Exchange occurs and is leached in ore leachate, realizes that the oxalic acid precipitation RE waste water containing oxalic acid recycles.
Embodiment 2
A kind of method that oxalic acid precipitation RE waste water recycles, comprising the following steps:
(1) wastewater collection: by the acid oxalic acid precipitation RE waste water containing oxalic acid, the extraction wastewater containing rare earth element is collected respectively
To different ground catch basins；PH is 1 in the oxalic acid precipitation RE waste water containing oxalic acid, including oxalic acid precipitation rare earth mother solution is useless
Water, oxalic acid precipitation rare earth washes；
(2) it detects: detecting the substance withdrawl syndrome of the oxalic acid precipitation RE waste water mesoxalic acid containing oxalic acid respectively and containing rare earth element
Extraction wastewater in rare earth element substance withdrawl syndrome；The substance withdrawl syndrome of its mesoxalic acid is 0.2 mol/L, rare earth element
Substance withdrawl syndrome be 0.008 mol/L；
(3) oxalic acid precipitation: according to the testing result of step (2), control volume ratio by containing oxalic acid oxalic acid precipitation RE waste water and
Extraction wastewater containing rare earth element imports agitating reaction pond, opens 30 min of stirring, after the completion of precipitation reaction, makes in composite waste
The substance withdrawl syndrome of oxalic acid is 0.00005 mol/L, and the substance withdrawl syndrome of rare earth element is 0.0001 mol/L, and realization is gone
Except the purpose of RE waste water mesoxalic acid；
(4) it is separated by solid-liquid separation: the composite waste after the completion of precipitation reaction being introduced into solid-liquid separation tank, composite waste is in solid-liquid separation tank
It is inside separated by solid-liquid separation from top to bottom, the first drainage plate is flowed by skirt first, has filter cartridge, composite waste on the first drainage plate
Filter cartridge carry out first time separation of solid and liquid, then through the second drainage plate flow into filter mechanism, composite waste filter mechanism into
Second of separation of solid and liquid of row realizes that solid-liquid is kept completely separate, filter residue is heavy for oxalic acid finally by being separated by solid-liquid separation the filter plate of bottom of pond portion
Shallow lake rare earth, is used to prepare rare-earth products, and filtrate is the acid waste water without oxalic acid；
(5) prepared by ore leachate: (NH being added in acid waste water4)2SO4To NH4 +Mass percent be 5%, adjust pH value be 5,
Obtain acid (NH4)2SO4Ore leachate；
(6) mine is soaked: by acid (NH4)2SO4Ore leachate soaks mine, under acid condition, rare earth element ion and NH for Rare Earth Mine4 +Exchange occurs and is leached in ore leachate, realizes that the oxalic acid precipitation RE waste water containing oxalic acid recycles.
Embodiment 3
A kind of method that oxalic acid precipitation RE waste water recycles, comprising the following steps:
(1) wastewater collection: by the acid oxalic acid precipitation RE waste water containing oxalic acid, the extraction wastewater containing rare earth element is collected respectively
To different ground catch basins；PH is 2 in the oxalic acid precipitation RE waste water containing oxalic acid, including oxalic acid precipitation rare earth mother solution is useless
Water, oxalic acid precipitation rare earth washes；
(2) it detects: detecting the substance withdrawl syndrome of the oxalic acid precipitation RE waste water mesoxalic acid containing oxalic acid respectively and containing rare earth element
Extraction wastewater in rare earth element substance withdrawl syndrome；The substance withdrawl syndrome of its mesoxalic acid is 0.05 mol/L, rare earth member
The substance withdrawl syndrome of element is 0.01 mol/L；
(3) oxalic acid precipitation: according to the testing result of step (2), control volume ratio by containing oxalic acid oxalic acid precipitation RE waste water and
Extraction wastewater containing rare earth element imports agitating reaction pond, opens 10 min of stirring, after the completion of precipitation reaction, makes in composite waste
The substance withdrawl syndrome of oxalic acid is 0.0001 mol/L, and the substance withdrawl syndrome of rare earth element is 0.001 mol/L, realizes removal
The purpose of RE waste water mesoxalic acid；
(4) it is separated by solid-liquid separation: the composite waste after the completion of precipitation reaction being introduced into solid-liquid separation tank, composite waste is in solid-liquid separation tank
It is inside separated by solid-liquid separation from top to bottom, the first drainage plate is flowed by skirt first, has filter cartridge, composite waste on the first drainage plate
Filter cartridge carry out first time separation of solid and liquid, then through the second drainage plate flow into filter mechanism, composite waste filter mechanism into
Second of separation of solid and liquid of row realizes that solid-liquid is kept completely separate, filter residue is heavy for oxalic acid finally by being separated by solid-liquid separation the filter plate of bottom of pond portion
Shallow lake rare earth, is used to prepare rare-earth products, and filtrate is the acid waste water without oxalic acid；
(5) prepared by ore leachate: (NH being added in acid waste water4)2SO4To NH4 +Mass percent be 2%, adjust pH value be 4,
Obtain acid (NH4)2SO4Ore leachate；
(6) mine is soaked: by acid (NH4)2SO4Ore leachate soaks mine, under acid condition, rare earth element ion and NH for Rare Earth Mine4 +Exchange occurs and is leached in ore leachate, realizes that the oxalic acid precipitation RE waste water containing oxalic acid recycles.
Embodiment 4
A kind of method that oxalic acid precipitation RE waste water recycles, comprising the following steps:
(1) wastewater collection: by the acid oxalic acid precipitation RE waste water containing oxalic acid, the extraction wastewater containing rare earth element is collected respectively
To different ground catch basins；PH is 1 in the oxalic acid precipitation RE waste water containing oxalic acid, including oxalic acid precipitation rare earth mother solution is useless
Water, oxalic acid precipitation rare earth washes；
(2) it detects: detecting the substance withdrawl syndrome of the oxalic acid precipitation RE waste water mesoxalic acid containing oxalic acid respectively and containing rare earth element
Extraction wastewater in rare earth element substance withdrawl syndrome；The substance withdrawl syndrome of its mesoxalic acid is 0.2 mol/L, rare earth element
Substance withdrawl syndrome be 0.009 mol/L；
(3) oxalic acid precipitation: according to the testing result of step (2), control volume ratio by containing oxalic acid oxalic acid precipitation RE waste water and
Extraction wastewater containing rare earth element imports agitating reaction pond, opens 15 min of stirring, after the completion of precipitation reaction, makes in composite waste
The substance withdrawl syndrome of oxalic acid is 0.00002 mol/L, and the substance withdrawl syndrome of rare earth element is 0.0002 mol/L, and realization is gone
Except the purpose of RE waste water mesoxalic acid；
(4) it is separated by solid-liquid separation: the composite waste after the completion of precipitation reaction being introduced into solid-liquid separation tank, composite waste is in solid-liquid separation tank
It is inside separated by solid-liquid separation from top to bottom, the first drainage plate is flowed by skirt first, has filter cartridge, composite waste on the first drainage plate
Filter cartridge carry out first time separation of solid and liquid, then through the second drainage plate flow into filter mechanism, composite waste filter mechanism into
Second of separation of solid and liquid of row realizes that solid-liquid is kept completely separate, filter residue is heavy for oxalic acid finally by being separated by solid-liquid separation the filter plate of bottom of pond portion
Shallow lake rare earth, is used to prepare rare-earth products, and filtrate is the acid waste water without oxalic acid；
(5) prepared by ore leachate: (NH being added in acid waste water4)2SO4To NH4 +Mass percent be 4%, adjust pH value be 4,
Obtain acid (NH4)2SO4Ore leachate；
(6) mine is soaked: by acid (NH4)2SO4Ore leachate soaks mine, under acid condition, rare earth element ion and NH for Rare Earth Mine4 +Exchange occurs and is leached in ore leachate, realizes that the oxalic acid precipitation RE waste water containing oxalic acid recycles.
Claims (9)
1. a kind of method that oxalic acid precipitation RE waste water recycles, which comprises the following steps:
(1) wastewater collection: by the acid oxalic acid precipitation RE waste water containing oxalic acid, the extraction wastewater containing rare earth element is collected respectively
To different ground catch basins；
(2) it detects: detecting the substance withdrawl syndrome of the oxalic acid precipitation RE waste water mesoxalic acid containing oxalic acid respectively and containing rare earth element
Extraction wastewater in rare earth element substance withdrawl syndrome；
(3) oxalic acid precipitation: according to the testing result of step (2), control volume ratio by containing oxalic acid oxalic acid precipitation RE waste water and
Extraction wastewater containing rare earth element imports agitating reaction pond, opens stirring 10-30 min, after the completion of precipitation reaction, keeps mixing useless
The substance withdrawl syndrome of water mesoxalic acid is 0-0.0001 mol/L, and the substance withdrawl syndrome of rare earth element is 0.0001-0.001
Mol/L realizes the purpose of removal RE waste water mesoxalic acid；
(4) it is separated by solid-liquid separation: the composite waste after the completion of precipitation reaction being introduced into solid-liquid separation tank, composite waste is in solid-liquid separation tank
It is inside separated by solid-liquid separation from top to bottom, the first drainage plate is flowed by skirt first, has filter cartridge, composite waste on the first drainage plate
Filter cartridge carry out first time separation of solid and liquid, then through the second drainage plate flow into filter mechanism, composite waste filter mechanism into
Second of separation of solid and liquid of row realizes that solid-liquid is kept completely separate, filter residue is heavy for oxalic acid finally by being separated by solid-liquid separation the filter plate of bottom of pond portion
Shallow lake rare earth, is used to prepare rare-earth products, and filtrate is the acid waste water without oxalic acid；
(5) prepared by ore leachate: (NH being added in acid waste water4)2SO4, adjusting pH value is 4-5, obtains acid (NH4)2SO4Leaching
Mine liquid；
(6) mine is soaked: by acid (NH4)2SO4Ore leachate soaks mine, under acid condition, rare earth element ion and NH for Rare Earth Mine4 +
Exchange occurs and is leached in ore leachate, realizes that the oxalic acid precipitation RE waste water containing oxalic acid recycles.
2. the method that oxalic acid precipitation RE waste water according to claim 1 recycles, which is characterized in that described to contain oxalic acid
Oxalic acid precipitation RE waste water mesoxalic acid substance withdrawl syndrome be 0.05-0.3 mol/L.
3. the method that oxalic acid precipitation RE waste water according to claim 2 recycles, which is characterized in that described containing oxalic acid
PH is 1-2 in oxalic acid precipitation RE waste water.
4. the method that oxalic acid precipitation RE waste water according to claim 3 recycles, which is characterized in that described containing oxalic acid
Oxalic acid precipitation RE waste water includes oxalic acid precipitation rare earth mother solution waste water, oxalic acid precipitation rare earth washes.
5. the method that oxalic acid precipitation RE waste water according to claim 1 recycles, which is characterized in that described to contain rare earth
The substance withdrawl syndrome of rare earth element is 0.008-0.01 mol/L in the extraction wastewater of element.
6. the method that oxalic acid precipitation RE waste water according to claim 1 recycles, which is characterized in that in step (3),
After the completion of precipitation reaction, make the substance withdrawl syndrome 0-0.00005 mol/L of composite waste mesoxalic acid, the substance of rare earth element
Amount concentration be 0.0005-0.001 mol/L.
7. the method that oxalic acid precipitation RE waste water according to claim 1 recycles, which is characterized in that (the NH4)2SO4
NH in ore leachate4 +Mass percent be 2-5%.
8. the method that oxalic acid precipitation RE waste water according to claim 8 recycles, which is characterized in that (the NH4)2SO4
NH in ore leachate4 +Mass percent be 4.5%.
9. the method that oxalic acid precipitation RE waste water according to claim 7 recycles, which is characterized in that (the NH4)2SO4
The pH value of ore leachate is 4.
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| CN114990340A (en) * | 2022-06-10 | 2022-09-02 | 贵州大学 | Method for separating and recovering rare earth elements from acid mine wastewater |
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| CN105200250A (en) * | 2015-09-30 | 2015-12-30 | 中铝广西国盛稀土开发有限公司 | Method of recovering rare-earth elements from oxalic acid precipitate rare-earth mother liquor |
| CN105219962A (en) * | 2015-09-30 | 2016-01-06 | 中铝广西国盛稀土开发有限公司 | A kind of method of recovering rare earth element from carbonic acid precipitating rare earth mother liquor |
| CN106222419A (en) * | 2016-08-16 | 2016-12-14 | 南京格洛特环境工程股份有限公司 | Rare-earth oxidation europium extraction wastewater is except weight, except putting and resource recovery process |
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| CN114990340A (en) * | 2022-06-10 | 2022-09-02 | 贵州大学 | Method for separating and recovering rare earth elements from acid mine wastewater |
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