CN109252043A - A kind of high melt method of bastnasite - Google Patents
A kind of high melt method of bastnasite Download PDFInfo
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- CN109252043A CN109252043A CN201811223752.9A CN201811223752A CN109252043A CN 109252043 A CN109252043 A CN 109252043A CN 201811223752 A CN201811223752 A CN 201811223752A CN 109252043 A CN109252043 A CN 109252043A
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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
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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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
- C22B1/00—Preliminary treatment of ores or scrap
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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
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/11—Removing sulfur, phosphorus or arsenic other than by roasting
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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
- C22B3/10—Hydrochloric acid, other halogenated acids or salts thereof
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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
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Abstract
The invention discloses a kind of high melt method of bastnasite, have and shorten bastnasite treatment process, while improving salt Acid Leaching-out Ratio, while also more environmentally friendly advantage.A kind of high melt method of bastnasite comprising: step 1: melting is carried out after bastnasite is mixed with compound, investment has metallic iron in smelting equipment, and compound is alkali metal compound and/or alkaline earth metal compound；Step 2 uses dissolving with hydrochloric acid by the mixture of melting after supercooling.
Description
Technical field
The present invention relates to rare earth treatment technologies, and in particular to a kind of high melt method of bastnasite.
Background technique
Rare earth mine is divided into bastnasite and ionic absorption mine, and the decomposition of bastnasite and Extraction of rare earth technique are basic
It is roasting method, roasting method is primarily referred to as the processing method lower than 1000 DEG C, when 1000 DEG C or less, fluorine for rare earth
Carbon cerium lanthanum mine keeps solid state.
Bastnasite can be divided into sulfuric acid roasting method and oxidizing roasting method.It is dilute to solve the phosphoric acid in mine in sulfuric acid roasting method
Soil decomposes phosphorus and rare earth, sulfuric acid is added, a large amount of sulfide are discharged in roasting process, cause serious environmental pollution, tail gas
Processing is a great problem.What packet header bastnasite mainly used now is sulfuric acid roasting method.
Oxidizing roasting method mainly has following below scheme: bastnasite is through oxidizing roasting hydrochloric acid acidleach, repeated hydrogenation sodium oxide molybdena
Alkali turns fluorine removal, and neutrality is then washed with water into, then secondary pickling, three times acidleach again, wherein alkali turns to refer to be boiled with buck.This
Process flow is long, and generates waste water containing fluorine and containing alkali waste water, cause greatly to pollute to environment, wastewater treatment is also one
Hang-up.
Generally speaking, bastnasite is handled with roasting method, reaction process is slow, long flow path, causes more pollution.
Summary of the invention
It is an object of that present invention to provide a kind of high melt methods of bastnasite, pass through 1000 DEG C or more of high temperature pair
Bastnasite carries out melting, carries out more efficient processing to the other elements of its inside when liquid condition is presented in it, thus
Shorten the process of bastnasite disposed of in its entirety technique.
To achieve the goals above, the technical solution adopted by the present invention is as follows:
Compared with prior art, the present invention having following advantages:
A kind of high melt method of bastnasite, comprising:
Step 1: melting is carried out after bastnasite is mixed with compound, investment has metallic iron in smelting equipment, and compound is
Alkali metal compound and/or alkaline earth metal compound；
Step 2 uses dissolving with hydrochloric acid by the mixture of melting after supercooling.
As a preferred method,.The weight ratio of simple substance is 100:3 ~ 15 in bastnasite and compound, if compound
For alkali metal compound, simple substance refers to alkali metal simple substance in above compound, if compound is alkaline earth metal compound, above-mentionedization
It closes simple substance in object and refers to alkaline-earth metal simple substance.Compounds content is more, when acid is molten, contains more impurity in solution, does not utilize
Subsequent extraction processing；Compounds content is less, and rare earth decomposes not exclusively, and leaching rate is low.
Bastnasite and compound mixing carry out melting after ball is made as a preferred method,.The mesh of ball processed
Be the rate of recovery in order to improve product.
Smelting equipment will first add the mixed of bastnasite and compound as a preferred method, after metallic iron melts
Close object.In smelting equipment plus iron is primarily to when melting, is easy to conductive, plays the role of molten bath, another aspect metallic iron and fluorine
Phosphorus reaction in carbon cerium lanthanum mine generates ferrophosphorus, removes the phosphorus in bastnasite.Herein it is emphasized that not all fluorine
Carbon cerium lanthanum mine all contains phosphoric acid rare earth, and phosphoric acid rare earth scientific name is lanthanum orthophosphate cerium, the bastnasite in Sichuan not phosphoric acid rare earth, and
The bastnasite in packet header and the U.S. then contains phosphoric acid rare earth.The smelting equipment for the not bastnasite of phosphoric acid rare earth
Iron is added to play molten bath, for the bastnasite of phosphorous acid rare earth plus iron can also be played in addition to playing the role of molten bath
The effect of dephosphorization, the metallic iron of 200 ~ 400kg is added in general 1 ton of smelting furnace for the not Sichuan Mine of phosphoric acid rare earth；
And the smelting furnace of phosphorous acid rare earth is needed to be ensured to react completely according to the content of phosphoric acid rare earth, additional amount is according to phosphoric acid
The content and chemical equation of rare earth directly calculate.
Smelting temperature is 1300 ~ 1800 DEG C as a preferred method, and smelting time is not less than 10min.
The ball for being made that diameter is 20 ~ 100mm is mixed in bastnasite and compound as a preferred method,.
Alkaline-earth metal is one or both of magnesium compound, calcium compound as a preferred method,.
Alkali metal compound is one or both of sodium compound, potassium compound as a preferred method,.
The mixture in above-mentioned steps 2 after melting is crushed to partial size less than carrying out after 200 mesh as a preferred method,
Dissolving with hydrochloric acid.If partial size, which can impact leaching rate to leaching rate greater than 200 mesh, is not achieved 90%.
Specifically, there are liquid and solid after above-mentioned dissolving with hydrochloric acid, liquid is rare earth-iron-boron, and solid is rare earth waste,
Stacking is handled after rare earth waste water purification is washed.
Specifically, dissolving with hydrochloric acid process are as follows: mixture and water are sized mixing with the mixing of weight ratio 4 ~ 5:1 ratio, and stirring is slow
Slow that salt Ore Leaching is added, the acidity of solution filters washing 2 ~ 3 times after 0.5 ~ 0.6mol/L, dissolution after dissolution, and water lotion is incorporated to
Stoste, slag-liquid separation, liquid are rare earth-iron-boron, and slag is rare earth waste, and liquid enters next process extraction.
The additional amount of concentrated hydrochloric acid is 1.5 ~ 2 times of theoretical amount as a preferred method,.
Compared with the prior art, the present invention has the following beneficial effects:
Metallic iron is added in the present invention in smelting furnace, and in bastnasite miberal powder plus alkali or alkaline earth metal compound mixes
By 1300 DEG C ~ 1800 DEG C meltings of smelting furnace, bastnasite is made to become liquid, the phosphorus in phosphoric acid rare earth in bastnasite
Ferrophosphorus is formed in conjunction with iron, alkali or alkaline earth metal compound decomposes rare earth and fluorine in conjunction with the fluorine in bastnasite.
The rare-earth products that melting obtains are crushed, add salt Ore Leaching that rare earth-iron-boron can be obtained again after powder processed.In bastnasite
Phosphorus has arrived in molten iron, and fluorine has arrived in rare earth waste, because turning also just not generating the waste water containing alkali without sodium hydroxide alkali, because
It is added without sulfuric acid, sulfur content itself is not high in bastnasite, and sulphur can be up to standard after bag-type dust, spray column spray-absorption
Discharge.Therefore, the present invention has the advantages that so that entire bastnasite processing technological flow shortens and more environmentally-friendly.
In the present invention, bastnasite treatment process carries out processing salt Acid Leaching-out Ratio 95% or more, is much higher than existing oxidation
The salt Acid Leaching-out Ratio (80% or so) of roasting method.
A kind of high melt method of bastnasite provided by the invention be applied directly to it is industrial, rather than be limitation
In the method for laboratory stage.
Specific embodiment
It is an object of the invention to overcome the deficiencies of existing technologies, a kind of high melt method of bastnasite is provided,
Below with reference to embodiment, invention is further described in detail.
Embodiment 1
A kind of high melt method of bastnasite, including following treatment process:
(1) bastnasite in Sichuan and calcium compound are mixed, the weight of the calcium in bastnasite and calcium compound
Than for 100:3；
(2) it is mixed and rare earth mixing ball is made, ball is 20 ~ 100mm of diameter；
(3) metallic iron is added in smelting furnace, the metallic iron that 200 ~ 400kg is added in 1 ton of smelting furnace is layered on melting furnace bottom；
(4) rare earth mixing ball is added after the metallic iron melts in smelting furnace, carries out melting at 1300 DEG C ~ 1800 DEG C of temperature, it is dilute
Soil mixing ball fusing, melting come out of the stove more than 10min, pour into and receive cooling in crucible；
(5) mixture after cooling is mixed after powder crushing process (partial size is less than 200 mesh) with water with weight ratio 4 ~ 5:1 ratio
It sizes mixing；
(6) stirring is slowly added to salt Ore Leaching, and the acidity of solution filters washing 2 ~ 3 after 0.5 ~ 0.6mol/L, dissolution after dissolution
Secondary, water lotion is incorporated to stoste, slag-liquid separation, and liquid is rare earth-iron-boron, and slag is rare earth waste.
In the present embodiment, salt Acid Leaching-out Ratio is 97%.
Embodiment 2
A kind of high melt method of bastnasite, including following treatment process:
(1) bastnasite in Sichuan and calcium compound are mixed, the weight of the calcium in bastnasite and calcium compound
Than for 100:15；
(2) it is mixed and rare earth mixing ball is made, ball is 20 ~ 100mm of diameter；
(3) metallic iron is added in smelting furnace, the metallic iron that 200 ~ 400kg is added in 1 ton of smelting furnace is layered on melting furnace bottom；
(4) rare earth mixing ball is added after the metallic iron melts in smelting furnace, carries out melting at 1300 DEG C ~ 1800 DEG C of temperature, it is dilute
Soil mixing ball fusing, melting come out of the stove more than 10min, pour into and receive cooling in crucible；
(5) mixture after cooling is mixed after powder crushing process (partial size is less than 200 mesh) with water with weight ratio 4 ~ 5:1 ratio
It sizes mixing；
(6) stirring is slowly added to salt Ore Leaching, and the acidity of solution filters washing 2 ~ 3 after 0.5 ~ 0.6mol/L, dissolution after dissolution
Secondary, water lotion is incorporated to stoste, slag-liquid separation, and liquid is rare earth-iron-boron, and slag is rare earth waste.
The present embodiment the difference from embodiment 1 is that, bastnasite is different from the weight ratio of calcium compound, the present embodiment
Middle salt Acid Leaching-out Ratio is 97%.
Embodiment 3
A kind of high melt method of bastnasite, including following treatment process:
(1) bastnasite in Sichuan and magnesium compound are mixed, the weight of the magnesium in bastnasite and magnesium compound
Than for 100:3；
(2) it is mixed and rare earth mixing ball is made, ball is 20 ~ 100mm of diameter；
(3) metallic iron is added in smelting furnace, the metallic iron that 200 ~ 400kg is added in 1 ton of smelting furnace is layered on melting furnace bottom；
(4) rare earth mixing ball is added after the metallic iron melts in smelting furnace, carries out melting at 1300 DEG C ~ 1800 DEG C of temperature, it is dilute
Soil mixing ball fusing, melting come out of the stove more than 10min, pour into and receive cooling in crucible；
(5) mixture after cooling is mixed after powder crushing process (partial size is less than 200 mesh) with water with weight ratio 4 ~ 5:1 ratio
It sizes mixing；
(6), stirring is slowly added to salt Ore Leaching, and the acidity of solution filters washing 2 ~ 3 after 0.5 ~ 0.6mol/L, dissolution after dissolution
Secondary, water lotion is incorporated to stoste, slag-liquid separation, and liquid is rare earth-iron-boron, and slag is rare earth waste.
The present embodiment the difference from embodiment 1 is that, compound is different, and salt Acid Leaching-out Ratio is 96% in the present embodiment.
Embodiment 4
A kind of high melt method of bastnasite, including following treatment process:
(1) bastnasite in Sichuan and sodium compound are mixed, the weight of the sodium in bastnasite and sodium compound
Than for 100:3；
(2) it is mixed and rare earth mixing ball is made, ball is 20 ~ 100mm of diameter；
(3) metallic iron is added in smelting furnace, the metallic iron that 200 ~ 400kg is added in 1 ton of smelting furnace is layered on melting furnace bottom；
(4) rare earth mixing ball is added after the metallic iron melts in smelting furnace, carries out melting at 1300 DEG C ~ 1800 DEG C of temperature, it is dilute
Soil mixing ball fusing, melting come out of the stove more than 10min, pour into and receive cooling in crucible；
(5) mixture after cooling is mixed after powder crushing process (partial size is less than 200 mesh) with water with weight ratio 4 ~ 5:1 ratio
It sizes mixing；
(6), stirring is slowly added to salt Ore Leaching, and the acidity of solution filters washing 2 ~ 3 after 0.5 ~ 0.6mol/L, dissolution after dissolution
Secondary, water lotion is incorporated to stoste, slag-liquid separation, and liquid is rare earth-iron-boron, and slag is rare earth waste.
The present embodiment the difference from embodiment 1 is that, compound is different, and salt Acid Leaching-out Ratio is 95% in the present embodiment.
Embodiment 5
A kind of high melt method of bastnasite, including following treatment process:
(1) bastnasite in Sichuan and potassium compound are mixed, the weight of the potassium in bastnasite and potassium compound
Than for 100:3；
(2) it is mixed and rare earth mixing ball is made, ball is 20 ~ 100mm of diameter；
(3) metallic iron is added in smelting furnace, the metallic iron that 200 ~ 400kg is added in 1 ton of smelting furnace is layered on melting furnace bottom；
(4) rare earth mixing ball is added after the metallic iron melts in smelting furnace, carries out melting at 1300 DEG C ~ 1800 DEG C of temperature, it is dilute
Soil mixing ball fusing melting is come out of the stove more than 10min, is poured into and is received cooling in crucible；
(5) mixture after cooling is mixed after powder crushing process (partial size is less than 200 mesh) with water with weight ratio 4 ~ 5:1 ratio
It sizes mixing；
(6) stirring is slowly added to salt Ore Leaching, and the acidity of solution filters washing 2 ~ 3 after 0.5 ~ 0.6mol/L, dissolution after dissolution
Secondary, water lotion is incorporated to stoste, slag-liquid separation, and liquid is rare earth-iron-boron, and slag is rare earth waste.
The present embodiment the difference from embodiment 1 is that, compound is different, and salt Acid Leaching-out Ratio is 95% in the present embodiment.
Embodiment 6
A kind of high melt method of bastnasite, including following treatment process:
(1) bastnasite in Sichuan and calcium compound are mixed, the weight of the calcium in bastnasite and calcium compound
Than for 100:3；
(2) it is mixed and rare earth mixing ball is made, ball is 20 ~ 100mm of diameter；
(3) metallic iron is added in smelting furnace, the metallic iron that 200 ~ 400kg is added in 1 ton of smelting furnace is layered on melting furnace bottom；
(4) rare earth mixing ball is added after the metallic iron melts in smelting furnace, carries out melting at 1300 DEG C ~ 1800 DEG C of temperature, it is dilute
Soil mixing ball fusing, melting come out of the stove more than 10min, pour into and receive cooling in crucible；
(5) mixture after cooling is mixed after powder crushing process (partial size is in 50 mesh ~ 100 mesh) with water with weight ratio 4 ~ 5:1 ratio
Stirring is sized mixing；
(6) stirring is slowly added to salt Ore Leaching, and the acidity of solution filters washing 2 ~ 3 after 0.5 ~ 0.6mol/L, dissolution after dissolution
Secondary, water lotion is incorporated to stoste, slag-liquid separation, and liquid is rare earth-iron-boron, and slag is rare earth waste.
The present embodiment the difference from embodiment 1 is that, it is cooling after powder crushing process parameter it is different.In the present embodiment, hydrochloric acid
Leaching rate is 82%.
According to embodiment 1, embodiment 3 ~ 5, it can be seen that, alkaline earth metal compound is added to be had compared to alkali metal compound
Better leaching rate.
According to above-described embodiment, the present invention can be realized well.It is worth noting that before based on said structure design
It puts, to solve same technical problem, even if that makes in the present invention is some without substantive change or polishing, is used
Technical solution essence still as the present invention, therefore it should also be as within the scope of the present invention.
Claims (10)
1. a kind of high melt method of bastnasite, characterized in that it comprises:
Step 1: melting is carried out after bastnasite is mixed with compound, investment has metallic iron in smelting equipment, and compound is
Alkali metal compound and/or alkaline earth metal compound；
Step 2: using dissolving with hydrochloric acid after supercooling by the mixture of melting, obtain rare earth-iron-boron.
2. a kind of high melt method of bastnasite according to claim 1, which is characterized in that bastnasite with
The weight ratio of simple substance is 100:3 ~ 15 in compound, if compound is alkali metal compound, simple substance refers to alkali in above compound
Metal simple-substance, if compound is alkaline earth metal compound, simple substance refers to alkaline-earth metal simple substance in above compound.
3. a kind of high melt method of bastnasite according to claim 2, which is characterized in that bastnasite with
Compound mixing carries out melting after ball is made.
4. a kind of high melt method of bastnasite according to claim 3, which is characterized in that smelting equipment first will
The mixture of bastnasite and compound is added after metallic iron melts.
5. a kind of high melt method of bastnasite according to claim 1, which is characterized in that smelting temperature is
1300 ~ 1800 DEG C, smelting time is not less than 10min.
6. a kind of high melt method of bastnasite according to claim 1, which is characterized in that alkali metal compound
For one or both of sodium compound, potassium compound.
7. a kind of high melt method of bastnasite according to claim 2, which is characterized in that bastnasite with
The ball for being made that diameter is 20 ~ 100mm is mixed in compound.
8. a kind of high melt method of bastnasite according to claim 1, which is characterized in that alkaline-earth metal is magnesium
One or both of compound, calcium compound.
9. a kind of high melt method of bastnasite according to claim 1, which is characterized in that in above-mentioned steps 2
Mixture after melting is crushed to partial size less than carrying out dissolving with hydrochloric acid after 200 mesh.
10. a kind of high melt method of bastnasite according to claim 1, which is characterized in that dissolving with hydrochloric acid mistake
Journey are as follows: mixture and water are sized mixing with the mixing of weight ratio 4 ~ 5:1 ratio, and stirring is slowly added to salt Ore Leaching, solution after dissolution
Acidity washing 2 ~ 3 times is filtered after 0.5 ~ 0.6mol/L, dissolution, water lotion is incorporated to stoste, slag-liquid separation, and liquid is rare earth chlorine
Compound, slag are rare earth waste.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811223752.9A CN109252043A (en) | 2018-10-19 | 2018-10-19 | A kind of high melt method of bastnasite |
| CN201910966571.3A CN110684896A (en) | 2018-10-19 | 2019-10-12 | High-temperature smelting method for decomposing bastnaesite |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811223752.9A CN109252043A (en) | 2018-10-19 | 2018-10-19 | A kind of high melt method of bastnasite |
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| CN201910966571.3A Pending CN110684896A (en) | 2018-10-19 | 2019-10-12 | High-temperature smelting method for decomposing bastnaesite |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109837385A (en) * | 2019-04-15 | 2019-06-04 | 李洪明 | A kind of method that Rare Earth Mine is decomposed in heating melting conversion |
| CN110684896A (en) * | 2018-10-19 | 2020-01-14 | 华卫国 | High-temperature smelting method for decomposing bastnaesite |
| CN113462886A (en) * | 2021-06-29 | 2021-10-01 | 四川省乐山锐丰冶金有限公司 | Method for smelting bastnaesite by wet process |
| CN115322002A (en) * | 2022-09-23 | 2022-11-11 | 四川明宏恒进科技有限公司 | Preparation method of low-carbon low-metal-content electrofusion chromium oxide |
| CN115637339A (en) * | 2022-08-25 | 2023-01-24 | 华卫国 | Production process for extracting phosphorus product and rare earth product from monazite rare earth ore |
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| CN1261107A (en) * | 1999-11-26 | 2000-07-26 | 西南民族学院 | Defluorination process for preparing cerium from bastraesite ore |
| CN105039725A (en) * | 2015-06-28 | 2015-11-11 | 包头市玺骏稀土有限责任公司 | Method for recycling rare earth elements from rare earth electrolytic slag |
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| CN1173548A (en) * | 1997-05-06 | 1998-02-18 | 南京龙华特种合金研究所 | Process for directly producing rare-earth ferrosilicon (containing Ba) alloy by 1000-5000 KVA ferrosilicon furnace |
| CN109252043A (en) * | 2018-10-19 | 2019-01-22 | 华卫国 | A kind of high melt method of bastnasite |
| CN109280781A (en) * | 2018-10-24 | 2019-01-29 | 李洪明 | A kind of method of decomposition and inversion Rare Earth Mine |
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- 2018-10-19 CN CN201811223752.9A patent/CN109252043A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1261107A (en) * | 1999-11-26 | 2000-07-26 | 西南民族学院 | Defluorination process for preparing cerium from bastraesite ore |
| CN105039725A (en) * | 2015-06-28 | 2015-11-11 | 包头市玺骏稀土有限责任公司 | Method for recycling rare earth elements from rare earth electrolytic slag |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110684896A (en) * | 2018-10-19 | 2020-01-14 | 华卫国 | High-temperature smelting method for decomposing bastnaesite |
| CN109837385A (en) * | 2019-04-15 | 2019-06-04 | 李洪明 | A kind of method that Rare Earth Mine is decomposed in heating melting conversion |
| CN113462886A (en) * | 2021-06-29 | 2021-10-01 | 四川省乐山锐丰冶金有限公司 | Method for smelting bastnaesite by wet process |
| CN115637339A (en) * | 2022-08-25 | 2023-01-24 | 华卫国 | Production process for extracting phosphorus product and rare earth product from monazite rare earth ore |
| CN115637339B (en) * | 2022-08-25 | 2023-12-01 | 华卫国 | Production process for extracting phosphorus product and rare earth product from monazite rare earth ore |
| CN115322002A (en) * | 2022-09-23 | 2022-11-11 | 四川明宏恒进科技有限公司 | Preparation method of low-carbon low-metal-content electrofusion chromium oxide |
| CN115322002B (en) * | 2022-09-23 | 2023-08-25 | 四川明宏恒进科技有限公司 | Preparation method of low-carbon low-metal-content electrofused chromium oxide |
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| CN110684896A (en) | 2020-01-14 |
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Application publication date: 20190122 |