CN109136538B - Method for treating rare earth concentrate - Google Patents
Method for treating rare earth concentrate Download PDFInfo
- Publication number
- CN109136538B CN109136538B CN201810960213.7A CN201810960213A CN109136538B CN 109136538 B CN109136538 B CN 109136538B CN 201810960213 A CN201810960213 A CN 201810960213A CN 109136538 B CN109136538 B CN 109136538B
- Authority
- CN
- China
- Prior art keywords
- rare earth
- earth concentrate
- concentrate
- magnesium chloride
- roasting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- C22B1/02—Roasting processes
- C22B1/08—Chloridising roasting
-
- 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
- C22B3/08—Sulfuric acid, other sulfurated acids or salts thereof
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Geochemistry & Mineralogy (AREA)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a method for treating rare earth concentrate, which comprises the following steps:(1) mixing magnesium chloride with rare earth concentrate, and then roasting under the air condition to form a roasted product; wherein the weight ratio of the magnesium chloride to the rare earth concentrate is 0.5-1.9: 1, and MgCl in the magnesium chloride2The weight ratio of the rare earth concentrate to the rare earth concentrate is 0.23-0.9: 1, the roasting temperature is 460-580 ℃, and the roasting time is 30-200 minutes; (2) and directly leaching the cooled roasting product by using an acid solution, wherein the leaching rate of the rare earth metal is more than 95%. The invention can realize higher leaching rate at lower temperature and can avoid the roasted product from forming molten mass.
Description
Technical Field
The invention relates to a method for treating rare earth concentrate, in particular to a method for roasting and decomposing rare earth concentrate by magnesium chloride.
Background
The rare earth resources of the inner Mongolia Baotou are extremely thick and account for 81 percent of the national rare earth reserves. The Baotou rare earth concentrate accounts for more than 60 percent of the rare earth concentrate smelted in China. The process for extracting mixed rare earth from rare earth concentrate mainly comprises a roasting decomposition process of concentrated sulfuric acid. The roasting tail gas of the process contains a large amount of acid gases such as sulfur, fluorine and the like, and is treated by adopting a water spraying and absorbing method, but the discharged tail gas hardly reaches the relevant national emission standard. The spraying liquid is mixed acid of sulfuric acid, fluosilicic acid and hydrofluoric acid, is difficult to recycle, can only be neutralized by lime, has large amount of neutralized slag, and is easy to cause secondary pollution. Thorium element of the process is collected in leaching slag, the slag amount is large, the thorium element accounts for more than 50% of rare earth concentrate amount, the radioactive intensity exceeds the national low-radioactivity slag standard, and the thorium element is quite difficult to store and treat.
The disclosure of extracting mixed rare earth from rare earth concentrate also includes liquid caustic soda decomposition process. The process decomposes the rare earth concentrate by using a liquid alkali solution with the concentration of 50-70%, the reaction temperature is 140-160 ℃, then excess alkali and generated soluble salt are washed by water, and finally hydrochloric acid is dissolved to obtain a rare earth chloride solution. Acid waste gas, waste water containing ammonia nitrogen and radioactive waste residue are not generated in the process. In the process, the slurry viscosity is high after the concentrate is mixed with the sodium hydroxide solution, the concentrate and the sodium hydroxide solution react in a reaction kettle, the boiling point of a reaction system is reduced after partial sodium hydroxide is consumed by decomposition reaction, the reaction system is easily overheated to cause 'bumping' accidents, the production operation is not easy to control, and the operation post has a large safety risk. For example, chinese patent application No. 201010145840.9 discloses a process for decomposing rare earth concentrate by roasting with liquid caustic soda, wherein the concentrate is mixed with concentrated solution of sodium hydroxide (concentration > 60%), and roasted and decomposed at 150-550 ℃ in an industrial kiln, thereby realizing continuous production.
Generally, the process is carried out in a concentrated strong acid (concentrated sulfuric acid) or concentrated alkali (concentrated sodium hydroxide solution) system, so that the equipment is seriously corroded, the operating condition is poor, and the safety risk is high. Therefore, there is a need to develop a rare earth concentrate decomposition process that avoids the use of strong acids and bases. For example, chinese patent application No. 01128097.2 discloses a method for decomposing rare earth concentrates with calcium oxide and sodium chloride, roasting the rare earth concentrates at a high temperature above 700 ℃. For another example, CN102653820A discloses a method for extracting scandium from bayan obo tailings, which includes the following steps: (1) mixing tailings and activators such as calcium chloride according to a weight ratio of 1: 0.3-1.3; roasting the mixture obtained in the step (1) for 0.5-4 hours at the roasting temperature of 700-1200 ℃; washing the roasted ore with hot water to form the roasted ore and water washing liquid; concentrating the water washing liquid to recover the activating agent, and recycling the recovered activating agent to the step (1); and dissolving the washed roasted ore with inorganic acid to obtain a scandium-containing solution. The method only extracts single scandium element. For another example, CN102643992A discloses a method for recovering rare earth waste, which comprises the following steps: (1) adding a decomposition aid and fluxing agent powder into the rare earth waste, and uniformly mixing to obtain a mixture, wherein the dosage of the decomposition aid is 20-200 wt% of the total weight of the rare earth waste, and the dosage of the fluxing agent is 1-20 wt% of the total weight of the rare earth waste; the rare earth waste is mainly rare earth fluorescent powder waste and/or rare earth aluminate waste; the decomposition auxiliary agent is selected from one or more of magnesite, brucite or magnesium oxide; the fluxing agent is selected from one or more of boric acid, lithium metaborate, lithium tetraborate, sodium tetraborate, lithium carbonate, lithium chloride, magnesium chloride, sodium fluoride, magnesium fluoride or aluminum fluoride; (2) roasting the mixture obtained in the step (1) at the temperature of 600-1400 ℃ for 1-6 hours; (3) adding an acid solution into the roasted product obtained in the step (2) for acid dissolution, and filtering and separating to obtain acid leaching solution mainly containing rare earth elements and acid leaching slag; (4) separating rare earth elements and other metal elements in the pickle liquor. The roasting temperature of the method is too high, and the roasted ore is easy to form hard molten mass, so that the roasted ore can be subjected to subsequent leaching operation only by ball milling and crushing, otherwise, the leaching rate is reduced.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a method for treating rare earth concentrate, which can achieve a higher leaching rate at a lower temperature and can prevent the roasted product from forming a molten mass. The present inventors have found that the leaching rate of rare earth metals can be improved by controlling the ratio of magnesium chloride to rare earth concentrate and adjusting the roasting temperature, and that the formation of a melt from the roasted product can be avoided, thereby completing the present invention.
The invention provides a rare earth concentrate treatment method, which comprises the following steps:
(1) mixing magnesium chloride with rare earth concentrate, and then roasting under the air condition to form a roasted product; wherein the weight ratio of the magnesium chloride to the rare earth concentrate is 0.5-1.9: 1, and MgCl in the magnesium chloride2The weight ratio of the rare earth concentrate to the rare earth concentrate is 0.23-0.9: 1, the roasting temperature is 460-580 ℃, and the roasting time is 30-200 minutes;
(2) and directly leaching the cooled roasting product by using an acid solution, wherein the leaching rate of the rare earth metal is more than 95%.
According to the method of the invention, preferably, the weight ratio of the magnesium chloride to the rare earth concentrate is 1.0-1.8: 1, and MgCl in the magnesium chloride is selected2The weight ratio of the rare earth concentrate to the rare earth concentrate is 0.6-0.9: 1, and the roasting temperature is 500-580 ℃.
According to the method of the invention, the weight ratio of the magnesium chloride to the rare earth concentrate is preferably 1.5-1.8: 1 MgCl in magnesium chloride2The weight ratio of the rare earth concentrate to the rare earth concentrate is 0.7-0.85: 1, and the roasting temperature is 560-580 ℃.
According to the process of the present invention, preferably, the chloride of magnesium is magnesium chloride hexahydrate.
According to the method of the present invention, preferably, the rare earth concentrate is selected from one or more of monazite rare earth concentrate, fluorocarbon cerium rare earth concentrate and monazite and fluorocarbon cerium mixed rare earth concentrate.
According to the method of the present invention, preferably, the rare earth concentrate is a monazite and fluorocarbon cerium mixed rare earth concentrate.
According to the method, the content of the rare earth oxide REO in the rare earth concentrate is preferably 60-68 wt%.
According to the method of the invention, preferably, the roasted product after temperature reduction is not subjected to crushing treatment and is directly leached by using an acid solution.
According to the method, preferably, the acid solution is selected from a sulfuric acid aqueous solution with the concentration of 0.5-10 mol/L.
According to the method, preferably, the roasted product after being cooled is dissolved in the acid solution, so that a rare earth metal salt solution with the pH value of 4-5 is formed.
According to the invention, magnesium chloride and rare earth concentrate with a proper proportion are subjected to decomposition reaction at a lower temperature, and the intermediate product rare earth chloride is further decomposed to generate rare earth oxide, so that the occurrence of the decomposition reaction of the concentrate can be promoted. The final product obtained by decomposing the rare earth concentrate is the rare earth oxide which is easy to dissolve in acid, the rare earth can be leached under the low-acidity reaction condition, and the leaching rate is higher. The roasting process does not form a melt body and can not form a ring, the roasted product is powder, the flowability is good, and the continuous production is easy to realize.
Detailed Description
The present invention will be further described with reference to the following specific examples, but the scope of the present invention is not limited thereto.
As used herein, "selected from" or "selected from" refers to a selection of individual components or a combination of two (or more) components.
The method for treating rare earth concentrates according to the present invention comprises a roasting step and a leaching step, but does not comprise a crushing step.
The roasting step of the invention comprises: mixing magnesium chloride with rare earth concentrate, and then roasting under the air condition to form a roasted product; wherein the weight ratio of the magnesium chloride to the rare earth concentrate is 0.5-1.9: 1, and MgCl in the magnesium chloride2The weight ratio of the rare earth concentrate to the rare earth concentrate is 0.23-0.9: 1, the roasting temperature is 460-580 ℃, and the roasting time is 30-200 minutes.
In the present invention, the chlorides of magnesium include, but are not limited to, MgCl2，MgCl2·6H2O, and the like. It is very important to control the weight ratio of magnesium chloride to rare earth concentrate, especially to control the MgCl2Weight ratio to rare earth concentrate. The weight ratio of the magnesium chloride to the rare earth concentrate should be 0.5-1.9: 1, MgCl in the magnesium chloride2The weight ratio of the rare earth concentrate to the rare earth concentrate is 0.23-0.9: 1. When their ratio exceeds the above range, the leaching rate of rare earth metals is reduced. Especially when the ratio of the magnesium chloride to the rare earth concentrate is greater than 1.9:1 by weight, and MgCl2When the weight ratio of the rare earth concentrate to the rare earth concentrate is 0.23-0.9: 1, higher roasting temperature is needed, so that a molten mass is formed, the flowability of a roasted product is poor, and continuous production cannot be realized. In certain embodiments, the weight ratio of magnesium chloride to rare earth concentrate is 1.0 to 1.8: 1; preferably 1.5-1.8: 1. When the ratio of the rare earth and the rare earth is in the above range, the leaching rate of the rare earth is very high, and the roasting temperature is not required to be too high. In certain embodiments, MgCl in the chloride of magnesium2The weight ratio of the rare earth concentrate to the rare earth concentrate is 0.6-0.9: 1, and preferably 0.7-0.85: 1. When the ratio of the rare earth and the rare earth is in the above range, the leaching rate of the rare earth is very high, and the roasting temperature is not required to be too high.
In the present invention, it is also very important to control the firing temperature. The calcination temperature should be 460-580 ℃. The roasting temperature is lower than 460 ℃, so that the roasting is insufficient, and the leaching rate is reduced; firing temperatures above 580 deg.C result in the formation of a melt, ring formation, and poor flow properties of the fired product. In some embodiments, the firing temperature is 500 to 580 ℃; preferably 560 to 580 ℃. When the roasting temperature is in the range, the leaching rate of the rare earth is very high, and the formation of a molten mass can be avoided, thereby being beneficial to realizing continuous production. The calcination time may be 30 to 200 minutes, preferably 60 to 150 minutes, and more preferably 60 to 90 minutes. Thus, the roasting is sufficient, and the production efficiency is improved.
In the present invention, the chloride of magnesium means a compound formed by reacting magnesium with hydrochloric acid, and specific examples include, but are not limited to, magnesium chloride hexahydrate. The high rare earth grade product obtained after the ore dressing of the raw rock of the rare earth is called rare earth concentrate. The rare earth concentrate can be one or more selected from monazite rare earth concentrate, fluorocarbon cerium rare earth concentrate and monazite and fluorocarbon cerium mixed rare earth concentrate. According to one embodiment of the invention, the rare earth concentrate is a monazite and fluorocarbon cerium mixed rare earth concentrate. The invention surprisingly finds that when the rare earth concentrate is monazite and fluorocarbon cerium mixed rare earth concentrate, the leaching rate of the rare earth metal is higher.
The rare earth concentrate of the invention mainly comprises two types of monazite and bastnaesite.
(1) The bastnaesite is roasted at 450 ℃ to generate decomposition reaction, which comprises the following specific steps:
3RE(CO3)2F＝RE2O3+REF3+6CO2
3Ce(CO3)F+1/2O2＝2CeO2+CeF3+3CO2
the fluoride generated by decomposing the bastnaesite continuously reacts with magnesium chloride to generate rare earth chloride, which comprises the following specific steps:
2REF3+3MgCl3＝2RECl3+3MgF2
2CeF3+3MgCl3＝2CeCl3+3MgF2
the reaction of monazite with magnesium chloride is as follows:
2REPO4+3MgCl2＝2RECl3+Mg3(PO4)2
the rare earth chloride generated by the reaction is continuously decomposed to form rare earth oxide which is easily dissolved in acid, and the method is as follows
CeCl3+H2O+1/2O2＝CeO2+2HCl
2RECl3+3H2O＝RE2O3+6HCl
In the invention, the content of rare earth oxide REO in the rare earth concentrate is 38-68 wt%, preferably 50-68 wt%, and more preferably 60-68 wt%. The proper content of rare earth oxide REO is beneficial to reducing the roasting temperature and improving the leaching rate. In certain embodiments, the rare earth concentrate is a monazite and fluorocarbon cerium mixed rare earth concentrate containing 60-68 wt% of rare earth oxide REO. This can further improve the leaching rate.
The leaching steps of the invention comprise: and directly leaching the cooled roasting product by using an acid solution, wherein the leaching rate of the rare earth metal is more than 95%. The temperature of the roasted product is too high, and the temperature needs to be reduced, and the temperature can be naturally reduced or controlled. And cooling the roasted product to room temperature. By "directly" it is meant that the cooled calcine is not subjected to physical or chemical treatment to change the properties of the material, but not to limit the change in the spatial or overall shape of the calcine. According to one embodiment of the invention, the cooled roasted product is not crushed and is directly leached by an acidic solution. Examples of the pulverization treatment include, but are not limited to, grinding and the like.
In the present invention, the acidic solution may be selected from an aqueous sulfuric acid solution, an aqueous hydrochloric acid solution, and the like; preferably 0.5 to 10mol/L sulfuric acid aqueous solution. The concentration of the sulfuric acid aqueous solution may be 1 to 8mol/L, preferably 3 to 5 mol/L. This is advantageous for improving the leaching rate of rare earth metals.
In the invention, the roasted product after being cooled is dissolved in the acid solution, so that a rare earth metal salt solution with the pH value of 4-5 is formed. This gives a pure rare earth salt solution.
Example 1
100kg of monazite and fluorine carbon cerium mixed rare earth concentrate (REO content 65 wt%) and 150kg of magnesium chloride hexahydrate (MgCl)2Rare earth concentrate 0.70:1), heating to 580 ℃ in a muffle furnace, preserving heat, reacting for 1.0 hour to obtain a roasted product, cooling to room temperature, leaching with 3mol/L sulfuric acid, wherein the leaching rate of rare earth is 98.8 percent. The roasted product is powdery, and no molten phase is generated in the roasting process.
Example 2
100kg of monazite-fluorocarbon-cerium mixed rare earth concentrate (REO content 60 wt.%) was mixed with 180kg of magnesium chloride hexahydrate (MgCl)2Heating rare earth concentrate to 580 ℃ in a muffle furnace, preserving heat, reacting for 1.5 hours to obtain a roasted product, cooling to room temperature, leaching by using 3mol/L sulfuric acid, wherein the leaching rate of rare earth is 95.6%. The roasted product is powdery, and no molten phase is generated in the roasting process.
Example 3
100kg of rare earth fluorocarbon cerium concentrate (REO content 42 wt.%) was mixed with 50kg of magnesium chloride hexahydrate (MgCl)2Heating rare earth concentrate to 480 ℃ in a muffle furnace, preserving heat, reacting for 1.5 hours to obtain a roasted product, cooling to room temperature, leaching by using 3mol/L sulfuric acid, wherein the leaching rate of rare earth is 95.5%. The roasted product is powdery, and no molten phase is generated in the roasting process.
Comparative example 1
100kg of monazite-fluorocarbon-cerium mixed rare earth concentrate (REO content 50 wt.%) was mixed with 200kg of magnesium chloride hexahydrate (MgCl)2Heating the rare earth concentrate to 680 ℃ in a muffle furnace, preserving heat, reacting for 1.5 hours to obtain a roasted product, cooling to room temperature, leaching with 3mol/L sulfuric acid, wherein the leaching rate of the rare earth is 92.6%.
Comparative example 2
100kg of monazite rare earth concentrate (REO content 50 wt.%) was mixed with 260kg of magnesium chloride hexahydrate (MgCl)2Heating rare earth concentrate 1.2:1) in a muffle furnace to 700 ℃, preserving heat and reacting for 1.5 hours to obtain a roasted product, cooling to room temperature, leaching with 3mol/L sulfuric acid, wherein the leaching rate of rare earth is 88.3%.
The present invention is not limited to the above-described embodiments, and any variations, modifications, and substitutions which may occur to those skilled in the art may be made without departing from the spirit of the invention.
Claims (10)
1. The method for treating the rare earth concentrate is characterized by comprising the following steps of:
(1) mixing magnesium chloride with rare earth concentrate, and then roasting under the air condition to form a roasted product; wherein the weight ratio of the magnesium chloride to the rare earth concentrate is 0.5-1.9: 1, and MgCl in the magnesium chloride2The weight ratio of the rare earth concentrate to the rare earth concentrate is 0.23-0.9: 1, the roasting temperature is 460-580 ℃, and the roasting time is 30-200 minutes;
(2) and directly leaching the cooled roasting product by using an acid solution, wherein the leaching rate of the rare earth metal is more than 95%.
2. The method according to claim 1, wherein the weight ratio of the magnesium chloride to the rare earth concentrate is 1.0-1.8: 1, and MgCl is contained in the magnesium chloride2The weight ratio of the rare earth concentrate to the rare earth concentrate is 0.6-0.9: 1, and the roasting temperature is 500-580 ℃.
3. The method according to claim 1, wherein the weight ratio of the magnesium chloride to the rare earth concentrate is 1.5-1.8: 1, and MgCl is contained in the magnesium chloride2The weight ratio of the rare earth concentrate to the rare earth concentrate is 0.7-0.85: 1, and the roasting temperature is 560-580 ℃.
4. The process according to claim 1, characterized in that the chloride of magnesium is magnesium chloride hexahydrate.
5. The method of claim 1, wherein the rare earth concentrate is selected from one or more of monazite rare earth concentrate, fluorocarbon cerium rare earth concentrate, and monazite and fluorocarbon cerium mixed rare earth concentrate.
6. The method of claim 1, wherein the rare earth concentrate is a monazite and fluorocarbon cerium mixed rare earth concentrate.
7. The method according to claim 6, wherein the rare earth oxide REO content in the rare earth concentrate is 60-68 wt%.
8. The method according to any one of claims 1 to 7, wherein the cooled roasted product is leached directly with an acidic solution without being crushed.
9. The method according to claim 8, wherein the acidic solution is selected from an aqueous solution of sulfuric acid having a concentration of 0.5 to 10 mol/L.
10. The method according to claim 8, wherein the roasted product after being cooled is dissolved in the acidic solution, so as to form a rare earth metal salt solution with a pH of 4-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810960213.7A CN109136538B (en) | 2018-08-22 | 2018-08-22 | Method for treating rare earth concentrate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810960213.7A CN109136538B (en) | 2018-08-22 | 2018-08-22 | Method for treating rare earth concentrate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109136538A CN109136538A (en) | 2019-01-04 |
| CN109136538B true CN109136538B (en) | 2020-03-10 |
Family
ID=64790656
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810960213.7A Active CN109136538B (en) | 2018-08-22 | 2018-08-22 | Method for treating rare earth concentrate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109136538B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114480835B (en) * | 2022-01-28 | 2023-12-12 | 包头稀土研究院 | Method for decomposing mixed rare earth concentrate and use of composition |
| CN114480888A (en) * | 2022-01-28 | 2022-05-13 | 包头稀土研究院 | Method for improving rare earth recovery rate of bastnaesite |
| CN114836637B (en) * | 2022-05-20 | 2023-11-24 | 全南县新资源稀土有限责任公司 | Rare earth oxide acid-soluble grouping method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1049692C (en) * | 1997-12-26 | 2000-02-23 | 清华大学 | Method for extracting mixed rare earth oxide by salmiac roasting black weathering slime |
| CN1084301C (en) * | 1999-04-29 | 2002-05-08 | 清华大学 | Method for recovering rare earth carbonate by bastnaesite decomposition through ammonium chloride baking process |
| CN1164773C (en) * | 2001-08-28 | 2004-09-01 | 东北大学 | Roasting decomposition process of mengite-RE concentrate and mengite-mixed bastnaesite RE concentrate |
| CN103882222B (en) * | 2014-04-16 | 2015-11-04 | 江西理工大学 | Red soil nickel ore chloride salt baking extracts the method for nickel cobalt |
-
2018
- 2018-08-22 CN CN201810960213.7A patent/CN109136538B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109136538A (en) | 2019-01-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109517974B (en) | Smelting method for comprehensively recovering rare earth and fluorine from bastnaesite | |
| CN109136538B (en) | Method for treating rare earth concentrate | |
| CN113652560B (en) | Method for efficiently recovering rare earth from rare earth molten salt waste residues | |
| CN104263909B (en) | Process for recovering nickel, cobalt and iron from nickel oxide ores by virtue of roasting and water leaching | |
| WO2014154182A1 (en) | Method for converting and decomposing bastnaesite rare earth ore by calcinating same with calcium compound and masking agent | |
| CN106978531B (en) | The method that soda acid joint decomposes mixed rare earth concentrate | |
| CN109593974B (en) | Method for extracting lithium from lithium ore | |
| CN112981146A (en) | Method for recovering rare earth molten salt electrolytic slag through fluorine fixation transformation roasting | |
| CN114620752B (en) | Pretreatment method of secondary aluminum ash, water purifying agent and application | |
| CN104232882A (en) | Technology for recovering nickel, cobalt and iron from nickel oxide ores through high-temperature chlorinating volatilization | |
| EP3526353B1 (en) | Process for the preparation of a concentrate of metals, rare metals and rare earth metals from residues of alumina production by bayer process or from materials with a chemical composition similar to said residues, and refinement of the concentrate so obtained | |
| CN114074949B (en) | Catalytic dissociation method for fluoride in waste material of electrolytic tank | |
| CN108118143B (en) | Method for preparing lithium carbonate by extracting lithium from lepidolite through two-stage chlorination roasting-alkali liquor leaching method | |
| CN107935033B (en) | A kind of technique that titanium-containing blast furnace slag prepares titanium white raw material | |
| CN111647751B (en) | Method for enriching platinum group metals from automobile waste catalyst | |
| AU641593B2 (en) | Oxalate salt roasting of vanadium bearing concentrates | |
| CN110453093A (en) | A kind of method of Ti-containing slag Selectively leaching titanium | |
| CN106746402B (en) | Method for treating arsenic-removing sludge | |
| CN112981122B (en) | Method for recovering sodium and vanadium in sodium-modified vanadium extraction tailings | |
| CN113862494B (en) | Preparation method of titanium-rich material and preparation method of titanium tetrachloride | |
| CN111534661B (en) | High-magnesium vanadium slag pretreatment method based on magnesium roasting | |
| CN114314635A (en) | Method for extracting rare earth and recovering fluorine from bastnaesite high-grade leaching residue | |
| GB2238528A (en) | Selectively recovering lead, zinc and calcium from insoluble oxides or salts | |
| KR101746979B1 (en) | Counteragent regeneration for nickel hydrometallurgy | |
| US2163466A (en) | Process for the extraction of alkali hydrates or carbonates and of aluminum hydroxide from the double silicates of alkali and alumina |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |