CN109402395A - A kind of method of ammonium carbonate precipitating rare earth waste water reuse - Google Patents
A kind of method of ammonium carbonate precipitating rare earth waste water reuse Download PDFInfo
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- CN109402395A CN109402395A CN201811218583.XA CN201811218583A CN109402395A CN 109402395 A CN109402395 A CN 109402395A CN 201811218583 A CN201811218583 A CN 201811218583A CN 109402395 A CN109402395 A CN 109402395A
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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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
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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
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Abstract
The present invention relates to a kind of method of ammonium carbonate precipitating rare earth waste water reuse, this method includes wastewater collection, detection, carbonic acid precipitating, is separated by solid-liquid separation, ore leachate preparation, leaching mine, by that will contain NH4 +Ammonium carbonate precipitating rare earth waste water with containing rare earth element extraction wastewater occur precipitation reaction remove CO3 2‑/HCO3 ‑, then it is separated by solid-liquid separation and obtains containing NH4 +, be free of CO3 2‑/HCO3 ‑Waste water, be added H2SO4Obtain acidity (NH4)2SO4Ore leachate is used for the leaching mine of Rare Earth Mine.The present invention is realized containing NH simultaneously4 +Ammonium carbonate precipitating rare earth waste water and the extraction wastewater containing rare earth element recycling and reusing, avoid the wasting of resources and contaminated wastewater, while having saved ore leachate (NH4)2SO4Purchase cost, with good economic efficiency, social benefit and environmental benefit.
Description
Technical field
The invention belongs to RE waste water process fields, and in particular to a kind of side of ammonium carbonate precipitating rare earth waste water reuse
Method.
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 ammonium carbonate precipitating rare earth technique generates contains NH4 +、CO3 2-/HCO3 -Deng belonging to
Ammoniated wastewater, general processing method are unable to reach NH4 +、CO3 2-/HCO3 -The requirement sufficiently recycled, while wastewater treatment
It is not up to standard that very big pollution can be caused to water body.
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.Enterprise generally takes the ammonium sulfate of addition commercialization, sulphur
Acid (the NH of the reagents such as acid, hydrochloric acid preparation4)2SO4Ore leachate virtually increases production cost.
Therefore, NH will be contained4 +、CO3 2-/HCO3 -RE waste water recycling removal CO3 2-/HCO3 -, recycle NH4 +Preparation acid
Property (NH4)2SO4Ore leachate not only can solve the processing problem of 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 of ammonium carbonate precipitating rare earth waste water reuse
Method.
The present invention realizes in the following way:
A kind of method of ammonium carbonate precipitating rare earth waste water reuse, comprising the following steps:
(1) NH wastewater collection: will be contained4 +Ammonium carbonate precipitating rare earth waste water, the extraction wastewater containing rare earth element is collected into not respectively
Same ground catch basin；
(2) detect: detection contains NH respectively4 +Ammonium carbonate precipitating rare earth waste water in CO3 2-/HCO3 -Substance withdrawl syndrome and containing dilute
The substance withdrawl syndrome of rare earth element in the extraction wastewater of earth elements；
(3) carbonic acid precipitates: according to the testing result of step (2), NH will be contained by controlling volume ratio4 +Ammonium carbonate precipitating rare earth waste water
Agitating reaction pond is imported with the extraction wastewater containing rare earth element, stirring 10-30 min is opened, after the completion of precipitation reaction, makes to mix
CO in waste water3 2-/HCO3 -Substance withdrawl syndrome be 0-0.0001 mol/L, the substance withdrawl syndrome of rare earth element is 0.0001-
0.001 mol/L realizes CO in removal RE waste water3 2-/HCO3 -Purpose；
(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 carbonic 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 containing NH4 +, be free of CO3 2-/HCO3 -Composite waste；
(5) prepared by ore leachate: H being added in composite waste2SO4, adjust NH4 +Mass percent be 2-5%, pH value 4-5,
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 and contains NH4 +Ammonium carbonate precipitating rare earth waste water reuse.
Preferably, described to contain NH4 +Ammonium carbonate precipitating rare earth waste water in CO3 2-/HCO3 -Substance withdrawl syndrome be 0.5-
1.0 mol/L。
Preferably, described to contain NH4 +Ammonium carbonate precipitating rare earth waste water in NH4 +Mass percent be 0.5-3%.
Preferably, described to contain NH4 +Ammonium carbonate precipitating rare earth waste water include ammonium carbonate precipitating rare earth mother liquor waste water, ammonium carbonate
Precipitating rare earth washes.
Preferably, in the extraction wastewater containing rare earth element rare earth element substance withdrawl syndrome 0.008-0.01
mol/L。
Preferably, in step (3), after the completion of precipitation reaction, make CO in composite waste3 2-/HCO3 -Substance withdrawl syndrome be
0-0.00005 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 3.5%.
Preferably, the described (NH4)2SO4The pH value of ore leachate is 4.5.
The beneficial effects of the present invention are:
1. the present invention can be to containing NH4 +Ammonium carbonate precipitating rare earth waste water in NH4 +、CO3 2-/HCO3 -It reuses, avoids again
NH4 +、CO3 2-/HCO3 -The 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 sulfuric acid ammonium 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 of ammonium carbonate precipitating rare earth waste water reuse, comprising the following steps:
(1) NH wastewater collection: will be contained4 +Ammonium carbonate precipitating rare earth waste water, the extraction wastewater containing rare earth element is collected into not respectively
Same ground catch basin；It is described to contain NH4 +Ammonium carbonate precipitating rare earth waste water in NH4 +Mass percent be 3%, including ammonium carbonate
Precipitating rare earth mother liquor waste water, ammonium carbonate precipitating rare earth washes；
(2) detect: detection contains NH respectively4 +Ammonium carbonate precipitating rare earth waste water in CO3 2-/HCO3 -Substance withdrawl syndrome and containing dilute
The substance withdrawl syndrome of rare earth element in the extraction wastewater of earth elements, wherein CO3 2-/HCO3 -Substance withdrawl syndrome be 0.8
Mol/L, 0.01 mol/L of substance withdrawl syndrome of rare earth element；
(3) carbonic acid precipitates: according to the testing result of step (2), NH will be contained by controlling volume ratio4 +Ammonium carbonate precipitating rare earth waste water
Agitating reaction pond is imported with the extraction wastewater containing rare earth element, 20 min of stirring is opened, after the completion of precipitation reaction, makes composite waste
Middle CO3 2-/HCO3 -Substance withdrawl syndrome be 0.00001 mol/L, the substance withdrawl syndrome of rare earth element is 0.0005mol/L,
Realize CO in removal RE waste water3 2-/HCO3 -Purpose；
(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 carbonic 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 containing NH4 +, be free of CO3 2-/HCO3 -Composite waste；
(5) prepared by ore leachate: H being added in composite waste2SO4, adjust NH4 +Mass percent be 3.5%, pH value 4.5,
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 and contains NH4 +Ammonium carbonate precipitating rare earth waste water reuse.
Embodiment 2
A kind of method of ammonium carbonate precipitating rare earth waste water reuse, comprising the following steps:
(1) NH wastewater collection: will be contained4 +Ammonium carbonate precipitating rare earth waste water, the extraction wastewater containing rare earth element is collected into not respectively
Same ground catch basin；It is described to contain NH4 +Ammonium carbonate precipitating rare earth waste water in NH4 +Mass percent be 2.5%, including carbonic acid
Ammonia-sinking shallow lake rare earth mother solution waste water, ammonium carbonate precipitating rare earth washes；
(2) detect: detection contains NH respectively4 +Ammonium carbonate precipitating rare earth waste water in CO3 2-/HCO3 -Substance withdrawl syndrome and containing dilute
The substance withdrawl syndrome of rare earth element in the extraction wastewater of earth elements, wherein CO3 2-/HCO3 -Substance withdrawl syndrome be 0.6
Mol/L, 0.01 mol/L of substance withdrawl syndrome of rare earth element；
(3) carbonic acid precipitates: according to the testing result of step (2), NH will be contained by controlling volume ratio4 +Ammonium carbonate precipitating rare earth waste water
Agitating reaction pond is imported with the extraction wastewater containing rare earth element, 30 min of stirring is opened, after the completion of precipitation reaction, makes composite waste
Middle CO3 2-/HCO3 -Substance withdrawl syndrome be 0.00005 mol/L, the substance withdrawl syndrome of rare earth element is 0.0001 mol/
L realizes CO in removal RE waste water3 2-/HCO3 -Purpose；
(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 carbonic 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 containing NH4 +, be free of CO3 2-/HCO3 -Composite waste；
(5) prepared by ore leachate: H being added in composite waste2SO4, adjust NH4 +Mass percent be 4%, pH value 4 obtains
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 and contains NH4 +Ammonium carbonate precipitating rare earth waste water reuse.
Embodiment 3
A kind of method of ammonium carbonate precipitating rare earth waste water reuse, comprising the following steps:
(1) NH wastewater collection: will be contained4 +Ammonium carbonate precipitating rare earth waste water, the extraction wastewater containing rare earth element is collected into not respectively
Same ground catch basin；It is described to contain NH4 +Ammonium carbonate precipitating rare earth waste water in NH4 +Mass percent be 0.5%, including carbonic acid
Ammonia-sinking shallow lake rare earth mother solution waste water, ammonium carbonate precipitating rare earth washes；
(2) detect: detection contains NH respectively4 +Ammonium carbonate precipitating rare earth waste water in CO3 2-/HCO3 -Substance withdrawl syndrome and containing dilute
The substance withdrawl syndrome of rare earth element in the extraction wastewater of earth elements, wherein CO3 2-/HCO3 -Substance withdrawl syndrome be 1.0
Mol/L, 0.009 mol/L of substance withdrawl syndrome of rare earth element；
(3) carbonic acid precipitates: according to the testing result of step (2), NH will be contained by controlling volume ratio4 +Ammonium carbonate precipitating rare earth waste water
Agitating reaction pond is imported with the extraction wastewater containing rare earth element, 10 min of stirring is opened, after the completion of precipitation reaction, makes composite waste
Middle CO3 2-/HCO3 -Substance withdrawl syndrome be 0.0001 mol/L, the substance withdrawl syndrome of rare earth element is 0.001 mol/L,
Realize CO in removal RE waste water3 2-/HCO3 -Purpose；
(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 carbonic 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 containing NH4 +, be free of CO3 2-/HCO3 -Composite waste；
(5) prepared by ore leachate: H being added in composite waste2SO4, adjust NH4 +Mass percent be 2%, pH value 5 obtains
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 and contains NH4 +Ammonium carbonate precipitating rare earth waste water reuse.
Embodiment 4
A kind of method of ammonium carbonate precipitating rare earth waste water reuse, comprising the following steps:
(1) NH wastewater collection: will be contained4 +Ammonium carbonate precipitating rare earth waste water, the extraction wastewater containing rare earth element is collected into not respectively
Same ground catch basin；It is described to contain NH4 +Ammonium carbonate precipitating rare earth waste water in NH4 +Mass percent be 3%, including ammonium carbonate
Precipitating rare earth mother liquor waste water, ammonium carbonate precipitating rare earth washes；
(2) detect: detection contains NH respectively4 +Ammonium carbonate precipitating rare earth waste water in CO3 2-/HCO3 -Substance withdrawl syndrome and containing dilute
The substance withdrawl syndrome of rare earth element in the extraction wastewater of earth elements, wherein CO3 2-/HCO3 -Substance withdrawl syndrome be 1.0
Mol/L, 0.01 mol/L of substance withdrawl syndrome of rare earth element；
(3) carbonic acid precipitates: according to the testing result of step (2), NH will be contained by controlling volume ratio4 +Ammonium carbonate precipitating rare earth waste water
Agitating reaction pond is imported with the extraction wastewater containing rare earth element, 30 min of stirring is opened, after the completion of precipitation reaction, makes composite waste
Middle CO3 2-/HCO3 -Substance withdrawl syndrome be 0.0008 mol/L, the substance withdrawl syndrome of rare earth element is 0.0008 mol/L,
Realize CO in removal RE waste water3 2-/HCO3 -Purpose；
(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 carbonic 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 containing NH4 +, be free of CO3 2-/HCO3 -Composite waste；
(5) prepared by ore leachate: H being added in composite waste2SO4, adjust NH4 +Mass percent be 5%, pH value 4 obtains
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 and contains NH4 +Ammonium carbonate precipitating rare earth waste water reuse.
Claims (8)
1. a kind of method of ammonium carbonate precipitating rare earth waste water reuse, which comprises the following steps:
(1) NH wastewater collection: will be contained4 +Ammonium carbonate precipitating rare earth waste water, the extraction wastewater containing rare earth element is collected into not respectively
Same ground catch basin；
(2) detect: detection contains NH respectively4 +Ammonium carbonate precipitating rare earth waste water in CO3 2-/HCO3 -Substance withdrawl syndrome and containing dilute
The substance withdrawl syndrome of rare earth element in the extraction wastewater of earth elements；
(3) carbonic acid precipitates: according to the testing result of step (2), NH will be contained by controlling volume ratio4 +Ammonium carbonate precipitating rare earth 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
CO in water3 2-/HCO3 -Substance withdrawl syndrome be 0-0.0001 mol/L, the substance withdrawl syndrome of rare earth element is 0.0001-
0.001 mol/L realizes CO in removal RE waste water3 2-/HCO3 -Purpose；
(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 carbonic 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 containing NH4 +, be free of CO3 2-/HCO3 -Composite waste；
(5) prepared by ore leachate: H being added in composite waste2SO4, adjust NH4 +Mass percent be 2-5%, pH value 4-5 obtains
To 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 and contains NH4 +Ammonium carbonate precipitating rare earth waste water reuse.
2. the method for ammonium carbonate precipitating rare earth waste water reuse according to claim 1, which is characterized in that described to contain NH4 +
Ammonium carbonate precipitating rare earth waste water in CO3 2-/HCO3 -Substance withdrawl syndrome be 0.5-1.0 mol/L.
3. the method for ammonium carbonate precipitating rare earth waste water reuse according to claim 2, which is characterized in that described to contain NH4 +
Ammonium carbonate precipitating rare earth waste water in NH4 +Mass percent be 0.5-3%.
4. the method for ammonium carbonate precipitating rare earth waste water reuse according to claim 3, which is characterized in that described to contain NH4 +
Ammonium carbonate precipitating rare earth waste water include ammonium carbonate precipitating rare earth mother liquor waste water, ammonium carbonate precipitating rare earth washes.
5. the method for ammonium carbonate precipitating rare earth waste water reuse according to claim 1, which is characterized in that described containing dilute
The substance withdrawl syndrome 0.008-0.01 mol/L of rare earth element in the extraction wastewater of earth elements.
6. the method for ammonium carbonate precipitating rare earth waste water reuse according to claim 1, which is characterized in that step (3)
In, after the completion of precipitation reaction, make CO in composite waste3 2-/HCO3 -Substance withdrawl syndrome be 0-0.00005 mol/L, rare earth member
The substance withdrawl syndrome of element is 0.0005-0.001 mol/L.
7. the method for ammonium carbonate precipitating rare earth waste water reuse according to claim 1, which is characterized in that (the NH4)2SO4NH in ore leachate4 +Mass percent be 3.5%.
8. the method for ammonium carbonate precipitating rare earth waste water reuse according to claim 7, which is characterized in that (the NH4)2SO4The pH value of ore leachate is 4.5.
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| CN103288248A (en) * | 2013-07-01 | 2013-09-11 | 全南包钢晶环稀土有限公司 | Combined treatment method for rear earth smelting/separating wastewater |
| CN105316485A (en) * | 2014-08-05 | 2016-02-10 | 阳泉市林兴磁性材料有限责任公司 | Recovery method for neodymium iron boron waste free of wastewater discharge |
| 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 |
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