CN105525092B - Method for removing phosphorus and calcium from rare earth-containing phosphorite by preferential leaching to enrich rare earth - Google Patents
Method for removing phosphorus and calcium from rare earth-containing phosphorite by preferential leaching to enrich rare earth Download PDFInfo
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- CN105525092B CN105525092B CN201410523267.9A CN201410523267A CN105525092B CN 105525092 B CN105525092 B CN 105525092B CN 201410523267 A CN201410523267 A CN 201410523267A CN 105525092 B CN105525092 B CN 105525092B
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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
- C22B3/06—Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic acid solutions, e.g. with acids generated in situ; in inorganic salt solutions other than ammonium salt solutions
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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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Abstract
A process for removing P and Ca from the phosphorus ore containing rare-earth elements by leaching them with the mixture of phosphoric acid and calcium dihydrogen phosphate includes such steps as mixing the phosphorus ore containing rare-earth elements with P (15-55 wt.%)2O5、2‑25g/L Ca2+Effective P2O55 to 45 weight percent of circulating phosphoric acid solution is mixed according to the solid-to-liquid ratio of 1:2 to 10, and the mixture is added intoStirring and reacting for 0.5-4 hours at the temperature of 20-70 ℃, then aging for 1-5 hours, and carrying out solid-liquid separation to obtain rare earth enriched slag and leachate. Mixing the obtained leachate with sulfuric acid, simultaneously adding a proper amount of gypsum residues, wherein the adding molar quantity of the sulfuric acid is 0.7-1 time of the molar quantity of calcium in the leachate, the adding amount of the gypsum residues is 10% -100% of the mass of the rare earth-containing phosphorite, filtering after reaction to obtain regenerated phosphoric acid and gypsum residues, and mixing part of the regenerated phosphoric acid with gypsum residue washing water and a proper amount of supplementing water to be used as circulating phosphoric acid for leaching.
Description
Technical field
Pass through phosphoric acid containing rare earth phosphate rock the invention belongs to the enrichment of association rare earth and synthetical recovery field, more particularly to one kind
The method of rare earth is enriched with the preferential Leaching Removal phosphorus calcium of calcium dihydrogen phosphate mixed solution.
Background technology
Rare earth resources are roughly divided into three kinds：(1) independent Rare Earth Mine, such as monazite, bastnaesite, xenotime；(2) be in from
Sub- form is adsorbed in the ion Rare Earth Mine between mineral grains surface or crystal layer；(3) Isomorphic replacemnt mode is present in other ore deposits
Association Rare Earth Mine in thing, such as apatite.At present, global rare earth mineral products are essentially from preceding 2 kinds of Rare Earth Mines, association Rare Earth Mine
Exploitation it is less.
The association of phosphorus ore middle rare earth is universal, content of rare earth, reaches as high as more than 5%, low only 0.1% or so.By
It is present in rare earth in isomorphism form in the phosphate mineral of apatite, physical upgrading is poor to the concentration effect of rare earth.By
In rare earth grade is low and objectionable impurities phosphorus and calcium content are high, the difficulty of directly leaching recovering rare earth is big, cost is high.Sulfuric acid process is
The basic skills of current Wet-process Phosphoric Acid Production in the world, during Wet-process Phosphoric Acid Production, when apatite is by sulfuric acid solution, is formed
A large amount of ardealites, and because ardealite has very strong adsorption capacity to rare earth, cause acid hemolysis process rare earth to be difficult to leach.
US4636369 is disclosed and aluminium ion, iron ion, silicon ion or its hybrid ionic is introduced in phosphoric acid by wet process ore pulp, dilute to increase
The solubility of soil in the solution, rare earth leaching rate is 56%.Chinese patent 200710178377.6 is disclosed in sulfuric acid decomposition phosphorus
Organic or inorganic surfactant is added during ore deposit, changes ardealite crystal formation and reduces the absorption to rare earth, the leaching of rare earth
Extracting rate is up to 80%.Chinese patent 201010217142.5 discloses a kind of method that phosphoric acid leaches rare earth, 65 DEG C of temperature with
Leached under conditions of upper with phosphoric acid and contain rare earth phosphate rock, rare earth leaching rate is up to 90% or so.Although above-mentioned various methods can be compared with
Rare earth is leached well, but because resulting phosphoric acid concentration containing re dip solution is high, or even containing impurity such as a large amount of calcium, from solution
Further recovering rare earth is difficult.
By impurity such as phosphorus, calcium, iron, the aluminium in the preferential removing phosphorus ore of preimpregnation, rare-earth enrichment ratio is improved, to association in phosphorus ore
The synthetical recovery of rare earth is very crucial.
Nitric acid and hydrochloric acid have a very high solvability to the phosphorus in apatite, calcium etc., but simultaneously rare earth also by big portion
Divide dissolution, it is difficult to reach enrichment rare earth purpose, and leachate is the mixed system of phosphate and nitrate or chloride, is unfavorable for
Phosphoric acid or phosphatization fertilizer production.Although sulfuric acid has very high solvability to the phosphorus in apatite, in sulfuric acid solution, phosphorus, iron,
Aluminium, rare earth etc. can be leached into solution, but calcium is then all transformed into gypsum and stayed in slag, because gypsum has strongly to rare earth
Suction-operated, cause leach rare earth again enter slag in.In sulfuric acid solution apatite, the ardealite quantity of slag is big, and usual 1
Ton phosphorus ore about 1.5 tons of ardealites of output after sulfuric acid leaching, rare earth grade in phosphogypsum slag is lower than phosphorus ore, does not reach pre- richness
The effect of collection.
In traditional Wet-process Phosphoric Acid Production, sulfuric acid decomposition phosphorus ore is carried out in a large amount of phosphoric acid solution media, therefore,
Actually decomposable process is carried out in two steps：It is that phosphorus ore is made with phosphoric acid or the phosphoric acid of return system at a temperature of 60~100 DEG C first
With phosphorus, calcium with phosphatase reaction because generating water miscible calcium dihydrogen phosphate [Ca (H2PO4)2] and removed from phosphorus ore, due to excess
The presence of phosphoric acid, rare earth ion and phosphate anion (PO4 3-) network synthesizing soluble complex anion [RE (PO4)2]3-, so that
So that a large amount of rare earths are leached into solution, rare earth leaching rate is up to more than 50%；Second step is calcium dihydrogen phosphate and excess sulfuric acid
Reaction, makes calcium dihydrogen phosphate be converted into phosphoric acid, and separates out gypsum, and the rare earth that the first step is leached is because absorption is again introduced into slag and damages
Lose.Because the reaction temperature of the first step is high, in addition to causing rare earth and being largely leached into solution, the fluorine in phosphorus ore changes into fluorination
Hydrogen, the latter reacts with the aluminosilicate in phosphorus ore, causes a large amount of aluminium, silicon to enter solution, influences later separation.
Ca5F(PO4)3+7H3PO4=5Ca (H2PO4)2+HF↑
3H2SO4+6HF+SiO2·Al2O3=H2SiF6+Al2(SO4)3+5H2O
Ca(H2PO4)2+H2SO4=CaSO4↓+2H3PO4
A kind of method for Extraction of rare earth from phosphorus ore that EP0522234A1 is announced, the i.e. principle based on above-mentioned phosphoric acid by wet process
The recovering rare earth from the phosphorus ore containing rare earth, its process is to mix the phosphoric acid of excessive three times with the phosphorus concentrate containing rare earth, is heated to
Condition carries out rock phosphate in powder decomposition at 60-110 DEG C, and reacted ore pulp carries out classification of sedimentation, obtain calcic coarse fraction waste and
Fine fraction rare earth slag containing rare earth.Due to being leached using 60-110 DEG C of high temperature, a large amount of rare earths are dissolved into solution, and rare earth is molten
Solution rate 30~40%, meanwhile, separately there are 20-50% rare earths to enter coarsely graded waste, cause rare earth to disperse, rare earth yield is low,
Rare earth yield only has 20-50%.Chinese patent 201110143415.0 discloses a kind of method of the rare-earth separating from phosphorus ore,
Phosphorus ore is leached with excess phosphoric acid, using the characteristic formation indissoluble rare earth fluoride of advantage element fluorine in phosphorus ore, rare earth is being leached
Be enriched with slag and phosphorus then with biphosphate calcium form enter solution in.
In summary, because phosphorus ore middle rare earth grade is low, and the impurity such as phosphorus, calcium, iron, the aluminium of Rare Earth Separation recovery are influenceed to contain
Amount is high, difficult and uneconomical using the method recovering rare earth for directly leaching rare earth, should improve rare earth by chemical subtraction method
Concentration ratio.Key is to combine phosphoric acid or production of phosphate fertilizer technique, on the premise of not influenceing phosphorus product to produce, is removed by pre-processing
Containing impurity such as the phosphorus in rare earth phosphate rock, calcium, iron, aluminium, rare-earth enrichment ratio is improved.
Although phosphoric acid is leached has good leaching effect to the phosphorus and calcium in apatite, due to phosphoric acid excess coefficient
Greatly, while also having preferable leaching effect to aluminium, iron, magnesium etc., even part rare earth is also leached under certain condition.Due to phosphorus
Acid value lattice are high, in process of production must phosphoric acid regeneration cycle use, otherwise cost is very high.Aluminium, iron, the dissolution of magnesium, can influence
The regeneration of phosphoric acid, aluminium, iron, magnesium run up to after finite concentration or even can not realize the regeneration cycle of phosphoric acid in systems.Rare earth
Dissolution then causes rare earth to disperse, loss.Therefore, dissolution of the reduction phosphoric acid excess coefficient to reduce aluminium, iron, magnesium, rare earth etc. is phosphorus
The key of acid system preimpregnation enrichment rare earth.
The content of the invention
The purpose of the present invention is that the deficiency existed for prior art passes through phosphoric acid and phosphoric acid there is provided one kind containing rare earth phosphate rock
The method that the preferential Leaching Removal phosphorus calcium of calcium dihydrogen mixed solution is enriched with rare earth.When containing rare earth phosphate rock, phosphorus are presoaked specific to phosphoric acid
The problems such as impurity such as excessive acid coefficient is big, high rare earth dissolution rate, a large amount of aluminium, iron, magnesium leach and influence phosphoric acid regeneration cycle, passes through
Calcium content forms a small amount of nanometer calcium hydrogen phosphate particle in ore pulp when control acid regeneration is with leaching, and is carried using nano particle as rare earth
Association rare earth in body separation and recovery phosphorus ore, while reducing phosphoric acid excess coefficient by the control of calcium concentration, makes effective P2O5Reduce into
And control the dissolution of the impurity elements such as iron in phosphorus ore, aluminium, magnesium.Concrete scheme is the control reaction bar in phosphoric acid regeneration cycle process
Part makes calcium in solution keep in the range of finite concentration, that is, forms phosphoric acid and calcium dihydrogen phosphate mixed solution, is utilized in leaching stage
Low-temp reaction technological means, i.e., react, phosphoric acid and calcium dihydrogen phosphate mixed solution act on being formed with phosphorus ore under the conditions of 20-60 DEG C
The calcium hydrogen phosphate particle of a small amount of about 200 nanometers of granularity, its content is the 0.05%~2% of leached mud weight, using being received in ore pulp
Rare earth is fixed in slag by the absorption strong to rare earth of meter level calcium hydrogen phosphate particle with eutectic effect, while because of mixed solution phosphoric acid
Excess coefficient is small, available phosphoric acid concentration is low, impurity elements of ferrum in phosphorus ore, aluminium, magnesium dissolution rate it is relatively low, to phosphoric acid step for regeneration shadow
Sound is small.
The purpose of the present invention is achieved by the following technical solution.
Embodiment of the present invention provides one kind and preferentially leached by phosphoric acid and calcium dihydrogen phosphate mixed solution containing rare earth phosphate rock
The method that phosphorus calcium is enriched with rare earth is removed, this method comprises the following steps：
(1) reacted containing rare earth phosphate rock with circulating leaching agent, reaction temperature is 20 DEG C -70 DEG C, preferably 30 DEG C -50 DEG C；
(2) the slurry feeding tank diameter after step (1) is aged, digestion time 1-5 hours；
(3) by the slurry separation of solid and liquid after step (2), rare-earth enrichment slag and leachate are obtained；
(4) leachate for obtaining step (3) is mixed with sulfuric acid, gypsum tailings, and sulfuric acid adds molal quantity in leachate
0.7-1 times of calcium molal quantity, gypsum tailings addition is the 10%-100% of the quality containing rare earth phosphate rock；
(5) by the slurry separation of solid and liquid after step (4), regeneration phosphoric acid and gypsum tailings, partial regeneration phosphoric acid and gypsum are obtained
Return to step (1) does recycled phosphoric acid use after wash heat water, appropriate supplement water mixing.
In the above method, the circulating leaching agent of the step (1) is phosphoric acid and calcium dihydrogen phosphate mixed solution, leaching agent
Total P2O5Mass concentration is 15%-55%, preferably 20%-35%, Ca2+Concentration is 2-25g/L, preferably 5-15g/L, effectively
P2O55wt%-45wt%；The solid-liquid quality of Phosphoric concentration bearing rare-earths and recycled phosphoric acid is 1 with volume ratio:2-10, preferably 1:4-8；Instead
It is 0.5-4 hours, preferably 1-3 hours between seasonable.
In the above method, the ageing of the step (2) adds the rare earth richness that step (2) is obtained in tank diameter during ageing
Collect slag in right amount, addition is the 10%-50% of the quality containing rare earth phosphate rock.
In the above method, step (4) sulfuric acid be concentration more than 90% the concentrated sulfuric acid, reaction temperature at 35 DEG C -80 DEG C,
Reaction time 3-4 hour.
One kind of the present invention is rich by phosphoric acid and the preferential Leaching Removal phosphorus calcium of calcium dihydrogen phosphate mixed solution containing rare earth phosphate rock
Collect the method for rare earth, by low temperature and control calcium concentration measure, reduce effectively acid concentration, and then realize selective leaching in leaching agent
Go out dephosphorization and calcium.I.e. by phosphoric acid and the low-temp reaction of calcium dihydrogen phosphate mixed solution, phosphorus, most of calcium are molten in phosphorus ore is ensured
While going out, a small amount of nanoscale calcium hydrogen phosphate particle is formed, so that rare earth is fixed in slag in absorption or eutectic form, is realized
Phosphorus ore middle rare earth efficiently separates enrichment.Simultaneously because of the impurity such as iron, aluminium, magnesium in effective acid concentration reduction, phosphorus ore in leaching agent
Dissolving also corresponding reduction, so as to reduce impurity element into the quantity in actified solution, is conducive to mixed solution leaching agent again
Raw and recycling.In principle, the phosphorus ore suitable for the present invention is not limited, as long as containing rare earth element, Ke Yishi
Phosphorus ore containing rare earth and the phosphorus concentrate containing rare earth, because phosphorus concentrate middle rare earth is than the rare-earth enrichment in raw ore, therefore, processing is containing dilute
The phosphorus concentrate of soil is economically more favourable.
To reduce cost, the present invention uses recycled phosphoric acid, can also use the phosphoric acid,diluted of phosphoric acid industry process, raw phosphoric acid,
Industrial phosphoric acid.
One kind of the present invention is rich by phosphoric acid and the preferential Leaching Removal phosphorus calcium of calcium dihydrogen phosphate mixed solution containing rare earth phosphate rock
Collect the method for rare earth, the selective dissolution of phosphorus and calcium is realized with control calcium concentration reaction technology by low temperature, so as to be enriched with rare earth.
With technique it is simple, matched with Wet Processes of Phosphoric Acid, rare-earth enrichment ratio and the rate of recovery it is high.
Brief description of the drawings
Accompanying drawing is the principle process chart of the inventive method.
Embodiment
It is a kind of that rare earth is enriched with by phosphoric acid and the preferential Leaching Removal phosphorus calcium of calcium dihydrogen phosphate mixed solution containing rare earth phosphate rock
Method, it is 15wt%-55wt%P that will contain rare earth phosphate rock with concentration2O5、2-25g/LCa2+Recycled phosphoric acid solution press solid-to-liquid ratio 1:
2-10 is mixed, by mixture stirring reaction 0.5-4 hours under the conditions of 20 DEG C -70 DEG C, is then aged 1-5 hours, separation of solid and liquid
Obtain rare-earth enrichment slag and leachate.Obtained leachate is mixed with sulfuric acid, while proper amount of gypsum slag is added, sulfuric acid addition mole
Quantity is 0.7-1 times of calcium molal quantity in leachate, and gypsum tailings addition is the 10%-100% of the quality containing rare earth phosphate rock, reaction
After be filtrated to get regeneration phosphoric acid and gypsum tailings, partial regeneration phosphoric acid is used as after mix with gypsum tailings wash water, appropriate supplement water and circulated
Phosphoric acid is returned to leach and used.
The method of the present invention is further described with following nonlimiting examples, to help to understand the present invention's
Content and its advantage, and not as limiting the scope of the present invention, protection scope of the present invention is determined by claims.
Embodiment 1
Take 100g 0.14wt%'s containing rare earth to contain P containing rare earth phosphate rock and 1000mL2O520wt%, Ca2+8g/L phosphoric acid,diluted
Solution presses solid-to-liquid ratio 1:10 mixing, then stirring reaction 1 hour at 20 DEG C is aged 2 hours, is filtrated to get filtrate and leaching
Slag, leached mud is weighed after drying, analyzed, slag rate 22%, slag Rare-Earth Content 0.59%, and rare earth 93% is enriched in slag, enrichment
Multiple is 4.2 times.
Embodiment 2
Take 100g 0.14wt%'s containing rare earth to contain P containing rare earth phosphate rock and 1000mL2O520wt%, Ca2+8g/L phosphoric acid,diluted
Solution presses solid-to-liquid ratio 1:10 mixing, then stirring reaction 1 hour at 45 DEG C is aged 2 hours, is filtrated to get filtrate and leaching
Slag, leached mud is weighed after drying, analyzed, slag rate 21%, slag Rare-Earth Content 0.57%, and rare earth 85% is enriched in slag, enrichment
Multiple is 4.1 times.
Embodiment 3
The Phosphoric concentration bearing rare-earths and 1000mL for taking 100g 0.14wt% containing rare earth contain P2O520wt%, Ca2+8g/L dilute phosphorus
Acid solution presses solid-to-liquid ratio 1:10 mixing, then stirring reaction 3 hours at 25 DEG C are aged 4 hours, are filtrated to get filtrate and leaching
Slag, leached mud is weighed after drying, analyzed, slag rate 18%, slag Rare-Earth Content 0.73%, and rare earth 94% is enriched in slag, enrichment
Multiple is 5.2 times.
Embodiment 4
Take 200g 5wt%'s containing rare earth to contain P containing rare earth phosphate rock and 1000mL2O530wt%, Ca2+15g/L recycled phosphoric acid
Solution presses solid-to-liquid ratio 1:10 mixing, then stirring reaction 4 hours at 30 DEG C are aged 2 hours, are filtrated to get filtrate and leaching
Slag, leached mud is weighed after drying, analyzed, slag rate 25%, slag Rare-Earth Content 19.5%, and rare earth 95% is enriched in slag, enrichment
Multiple is 4 times.
Embodiment 5
The Phosphoric concentration bearing rare-earths and 1000mL for taking 100g 0.8wt% containing rare earth contain P2O528wt%, Ca2+12g/L dilute phosphorus
Acid solution presses solid-to-liquid ratio 1:10 mixing, then stirring reaction 4 hours at 30 DEG C are aged 2 hours, are filtrated to get filtrate and leaching
Slag, leached mud is weighed after drying, analyzed, slag rate 25%, slag Rare-Earth Content 3.04%, and rare earth 95% is enriched in slag.
Embodiment 6
Take 100g 5wt%'s containing rare earth to contain P containing rare earth phosphate rock and 1000mL2O535wt%, Ca2+15g/L phosphoric acid,diluted is molten
Liquid presses solid-to-liquid ratio 1:10 mixing, then stirring reaction 4 hours at 50 DEG C are aged 2 hours, filter to obtain leached mud, leached mud exists
It is enriched with again once under the same terms, separation of solid and liquid, slag rate 20%, slag Rare-Earth Content 24.5%, rare earth 95% is enriched in slag.
Embodiment 7
Leachate obtained by Example 6, by the sulfuric acid of 0.85 times of amount addition 95% of calcium molal quantity in leachate, and
Add 50g gypsum tailings, 50 DEG C of reactions are filtered after 3 hours, take filtrate 500mL and the 5wt% containing the rare earth 50g containing rare earth phosphate rock mixed
Close, then stirring reaction 4 hours at 50 DEG C are aged 2 hours, filter to obtain leached mud, leached mud is enriched with again under the same conditions
Once, separation of solid and liquid, slag rate 22%, slag Rare-Earth Content 21.5%, rare earth 95% is enriched in slag.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can be readily occurred in,
It should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims
It is defined.
Claims (6)
1. a kind of method for being enriched with rare earth by preferential Leaching Removal phosphorus calcium containing rare earth phosphate rock, it is characterised in that the step of its process
Suddenly include：
(1) reacted containing rare earth phosphate rock with circulating leaching agent, circulating leaching agent is phosphoric acid and calcium dihydrogen phosphate mixed solution, leaching agent
P2O5Mass concentration is 15%-55%, Ca2+Concentration is 2-25g/L；The solid-liquid quality of Phosphoric concentration bearing rare-earths and recycled phosphoric acid with
Volume ratio is 1:2-10；Reaction time is 0.5-4 hours, and reaction temperature is 20 DEG C -70 DEG C；
(2) the slurry feeding tank diameter after step (1) is aged, digestion time 1-5 hours；
(3) by the slurry separation of solid and liquid after step (2), rare-earth enrichment slag and leachate are obtained；
(4) leachate for obtaining step (3) is mixed with sulfuric acid, gypsum tailings, and sulfuric acid adds molal quantity and rubbed for calcium in leachate
0.7-1 times of that number, gypsum tailings addition is the 10%-100% of the quality containing rare earth phosphate rock；
(5) by the slurry separation of solid and liquid after step (4), regeneration phosphoric acid and gypsum tailings, partial regeneration phosphoric acid and gypsum wash heat are obtained
Return to step (1) does recycled phosphoric acid use after water, appropriate supplement water mixing.
2. according to the method described in claim 1, it is characterised in that the P of step (1) leaching agent described in its process2O5Quality is dense
Spend for 20%-35%, Ca2+Concentration is 5-15g/L；The solid-liquid quality of Phosphoric concentration bearing rare-earths and recycled phosphoric acid is 1 with volume ratio:4-
8；Reaction time is 1-3 hours, and reaction temperature is 30 DEG C -50 DEG C.
3. according to the method described in claim 1, it is characterised in that available phosphoric acid in the leaching agent of the step (1) described in its process
P2O5Mass concentration is 5%-45%.
4. according to the method described in claim 1, it is characterised in that available phosphoric acid in the leaching agent of the step (1) described in its process
P2O5Mass concentration is 10%-25%.
5. according to the method described in claim 1, it is characterised in that the ageing of step (2) described in its process, in stirring during ageing
The rare-earth enrichment slag that addition step (3) is obtained in groove is appropriate, and addition is the 10%-50% of the quality containing rare earth phosphate rock.
6. according to the method described in claim 1, it is characterised in that step (4) sulfuric acid described in its process is concentration more than 90%
The concentrated sulfuric acid, reaction temperature is in 35 DEG C -80 DEG C, reaction time 3-4 hour.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410523267.9A CN105525092B (en) | 2014-09-30 | 2014-09-30 | Method for removing phosphorus and calcium from rare earth-containing phosphorite by preferential leaching to enrich rare earth |
| PCT/CN2015/074212 WO2016050036A1 (en) | 2014-09-30 | 2015-03-13 | Method for removing phosphorus and calcium rich in rare earth from phosphorite containing rare earth through priority leaching |
| AU2015319798A AU2015319798B2 (en) | 2014-09-30 | 2015-03-13 | A method of enriching rare earth by priority leaching and removing phosphorus and calcium from REE-bearing phosphorus ores |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410523267.9A CN105525092B (en) | 2014-09-30 | 2014-09-30 | Method for removing phosphorus and calcium from rare earth-containing phosphorite by preferential leaching to enrich rare earth |
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| AU2016279392B2 (en) * | 2015-06-19 | 2019-01-31 | Grirem Advanced Materials Co., Ltd. | Method for recovering phosphorus and rare earth from rare earth-containing phosphate ore, and substance containing rare earth phosphate |
| CN106391293A (en) * | 2016-08-30 | 2017-02-15 | 北京矿冶研究总院 | Method for separating and enriching rare earth in phosphorite through mineral separation |
| US11767228B2 (en) | 2018-05-03 | 2023-09-26 | Arafura Resources Limited | Processing rare earth sulphate solutions |
| US11858824B2 (en) | 2018-05-03 | 2024-01-02 | Arafura Resources Limited | Process for the recovery of rare earths |
| CN110055434B (en) * | 2019-04-18 | 2021-05-07 | 舒爱桦 | Method for recovering rare earth from wet-process phosphoric acid co-production high-strength alpha gypsum powder |
| CN111394571B (en) * | 2020-04-17 | 2022-02-15 | 包头稀土研究院 | Method for improving decomposition efficiency of rare earth mineral and sulfuric acid |
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| CN101451200A (en) * | 2007-11-29 | 2009-06-10 | 北京有色金属研究总院 | Rare-earth enrichment recovery method from phosphorite |
| CN102220488A (en) * | 2011-05-31 | 2011-10-19 | 北京矿冶研究总院 | Method for separating rare earth from phosphate ore |
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| SU1736933A1 (en) * | 1990-04-27 | 1992-05-30 | Московский институт тонкой химической технологии | Method of recovering rare-earth metals from apatite |
| RU2031842C1 (en) * | 1991-07-01 | 1995-03-27 | Юрий Георгиевич Горный | Method of rare-earth elements extraction from phosphate ore |
| CN102312089B (en) * | 2010-07-01 | 2013-06-05 | 北京矿冶研究总院 | Method for recovering rare earth from rare earth-containing phosphorite |
| US8524176B2 (en) * | 2011-12-15 | 2013-09-03 | Reenewal Corporation | Rare earth recovery from phosphor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101451200A (en) * | 2007-11-29 | 2009-06-10 | 北京有色金属研究总院 | Rare-earth enrichment recovery method from phosphorite |
| CN102220488A (en) * | 2011-05-31 | 2011-10-19 | 北京矿冶研究总院 | Method for separating rare earth from phosphate ore |
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| 返酸浸出磷矿中的稀土;汪胜东等;《有色金属》;20121231(第11期);第33-36期 * |
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| AU2015319798A1 (en) | 2016-04-14 |
| CN105525092A (en) | 2016-04-27 |
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