CN114314632A - Method for purifying refined scandium oxide - Google Patents
Method for purifying refined scandium oxide Download PDFInfo
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- CN114314632A CN114314632A CN202111674277.9A CN202111674277A CN114314632A CN 114314632 A CN114314632 A CN 114314632A CN 202111674277 A CN202111674277 A CN 202111674277A CN 114314632 A CN114314632 A CN 114314632A
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- scandium
- scandium oxide
- refined
- impurities
- precipitate
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- HYXGAEYDKFCVMU-UHFFFAOYSA-N scandium oxide Chemical compound O=[Sc]O[Sc]=O HYXGAEYDKFCVMU-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 54
- 239000002244 precipitate Substances 0.000 claims abstract description 35
- 239000012535 impurity Substances 0.000 claims abstract description 26
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 19
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 15
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 13
- 239000010936 titanium Substances 0.000 claims abstract description 13
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 12
- 150000007524 organic acids Chemical class 0.000 claims abstract description 11
- 238000006460 hydrolysis reaction Methods 0.000 claims abstract description 10
- 230000007062 hydrolysis Effects 0.000 claims abstract description 9
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims abstract description 5
- 229910052751 metal Inorganic materials 0.000 claims abstract description 5
- 239000002184 metal Substances 0.000 claims abstract description 5
- 239000002253 acid Substances 0.000 claims abstract description 4
- 230000001376 precipitating effect Effects 0.000 claims abstract description 4
- 238000000926 separation method Methods 0.000 claims abstract description 3
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 21
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 20
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 15
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 15
- LQPWUWOODZHKKW-UHFFFAOYSA-K scandium(3+);trihydroxide Chemical compound [OH-].[OH-].[OH-].[Sc+3] LQPWUWOODZHKKW-UHFFFAOYSA-K 0.000 claims description 15
- 238000005406 washing Methods 0.000 claims description 13
- 238000001556 precipitation Methods 0.000 claims description 12
- OMMFSGNJZPSNEH-UHFFFAOYSA-H oxalate;scandium(3+) Chemical compound [Sc+3].[Sc+3].[O-]C(=O)C([O-])=O.[O-]C(=O)C([O-])=O.[O-]C(=O)C([O-])=O OMMFSGNJZPSNEH-UHFFFAOYSA-H 0.000 claims description 10
- 229910052706 scandium Inorganic materials 0.000 claims description 10
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 9
- 239000000706 filtrate Substances 0.000 claims description 9
- SIXSYDAISGFNSX-UHFFFAOYSA-N scandium atom Chemical compound [Sc] SIXSYDAISGFNSX-UHFFFAOYSA-N 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 8
- 229910004369 ThO2 Inorganic materials 0.000 claims description 8
- 229910008253 Zr2O3 Inorganic materials 0.000 claims description 8
- 229910052681 coesite Inorganic materials 0.000 claims description 8
- 229910052906 cristobalite Inorganic materials 0.000 claims description 8
- 230000001590 oxidative effect Effects 0.000 claims description 8
- 150000002910 rare earth metals Chemical class 0.000 claims description 8
- 239000000377 silicon dioxide Substances 0.000 claims description 8
- 229910052682 stishovite Inorganic materials 0.000 claims description 8
- 229910052905 tridymite Inorganic materials 0.000 claims description 8
- QBYIENPQHBMVBV-HFEGYEGKSA-N (2R)-2-hydroxy-2-phenylacetic acid Chemical compound O[C@@H](C(O)=O)c1ccccc1.O[C@@H](C(O)=O)c1ccccc1 QBYIENPQHBMVBV-HFEGYEGKSA-N 0.000 claims description 7
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 7
- 235000006408 oxalic acid Nutrition 0.000 claims description 7
- IWYDHOAUDWTVEP-UHFFFAOYSA-N R-2-phenyl-2-hydroxyacetic acid Natural products OC(=O)C(O)C1=CC=CC=C1 IWYDHOAUDWTVEP-UHFFFAOYSA-N 0.000 claims description 6
- 229960002510 mandelic acid Drugs 0.000 claims description 6
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 6
- 239000007832 Na2SO4 Substances 0.000 claims description 5
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical group [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000012153 distilled water Substances 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- -1 organic acid salt Chemical class 0.000 claims description 4
- 150000003839 salts Chemical class 0.000 claims description 4
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 3
- HJGMWXTVGKLUAQ-UHFFFAOYSA-N oxygen(2-);scandium(3+) Chemical compound [O-2].[O-2].[O-2].[Sc+3].[Sc+3] HJGMWXTVGKLUAQ-UHFFFAOYSA-N 0.000 claims description 3
- 239000007800 oxidant agent Substances 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 239000003153 chemical reaction reagent Substances 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000000047 product Substances 0.000 description 5
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000542 Sc alloy Inorganic materials 0.000 description 1
- 241000968352 Scandia <hydrozoan> Species 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 150000003325 scandium Chemical class 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention provides a method for purifying refined scandium oxide, which comprises the following steps: and (3) taking a metal solution obtained after the coarse scandium oxide is dissolved in acid, adjusting the pH value, adding sulfate and organic acid, precipitating impurities in the coarse scandium oxide, and realizing the separation of the impurities in the coarse scandium oxide, wherein the impurities at least comprise one of titanium, zirconium and rare earth elements. The invention can precipitate titanium, zirconium and rare earth elements by utilizing the hydrolysis process, thereby achieving the effect of removing impurities, and the adopted chemical reagents are common chemical reagents and have low price.
Description
Technical Field
The invention belongs to the field of metal processing, and particularly relates to a method for purifying refined scandium oxide.
Background
Scandium oxide, as one of the more important products in scandium products, can be used for producing metal scandium, different scandium salts and various scandium alloys. However, the coarse scandium oxide contains a large amount of impurities such as titanium, zirconium, rare earth elements, iron, etc., and if the coarse scandium oxide is directly used, the performance of subsequent products is deteriorated. Therefore, the crude scandium oxide needs to be purified. The refined scandium oxide generally refers to national standard 3N scandium oxide and national standard 4N scandium oxide, especially to national standard 4N scandium oxide, and is a mainstream product in the market of the refined scandium oxide at present. The traditional method for purifying coarse scandium oxide to fine scandium oxide simply needs to use pure hydrochloric acid for dissolution, and adopts substances such as N235, P350 and the like to remove impurities in sequence, so that high-purity scandium oxide is obtained.
Disclosure of Invention
The invention provides a method for purifying refined scandium oxide, which can effectively remove titanium, zirconium and rare earth elements and has simple operation.
The invention provides a method for purifying refined scandium oxide, which comprises the following steps: and (3) taking a metal solution obtained after the coarse scandium oxide is dissolved in acid, adjusting the pH value, adding sulfate and organic acid, precipitating impurities in the coarse scandium oxide, and realizing the separation of the impurities in the coarse scandium oxide, wherein the impurities at least comprise one of titanium, zirconium and rare earth elements.
Further, the method specifically comprises:
s1 acidolysis process: dissolving crude scandium oxide with hydrochloric acid to form a solution;
s2 hydrolysis process: adjusting the pH to 2 and adding Na2SO4And mandelic acid, filtering;
s3 precipitation and water washing process: adjusting the pH of the filtrate in the hydrolysis process to form scandium hydroxide precipitate, filtering and washing;
s4 oxidative precipitation process: dissolving the washed solid with hydrochloric acid, adding an oxidant, heating, adding an organic acid capable of forming a precipitate with scandium into the solution to form an organic acid salt of scandium, and drying and roasting to obtain the high-purity scandium oxide.
Further, Sc in the crude scandium oxide2O3Not less than 95%, and the coarse scandium oxide at least contains Fe2O3、Zr2O3、TiO2、SiO2、CaO、Na2O、ThO2And rare earth impurities.
Further, the crude scandia contains Fe2O3 200-400ppm、Zr2O3 900-1100ppm、TiO2 1900-2100ppm、SiO2 400-600ppm、CaO 400-600ppm、Na2O 400-600ppm、ThO290-110ppm, and 900-.
Further, the impurities comprise titanium, zirconium and rare earth elements, and the organic acid is an organic acid capable of forming double salt precipitates with zirconium.
Further, the organic acid is mandelic acid, and the sulfate is Na2SO4。
Further, the S3 precipitation water washing process comprises the following steps: adding pure ammonia water into the filtrate until scandium hydroxide precipitate is formed, and removing the filtrate to obtain scandium hydroxide precipitate; washing scandium hydroxide precipitate with 40-80 deg.C distilled water, wherein the pH value of the washed raffinate is not less than 7.5.
Further, the S4 oxidation precipitation process includes: dissolving the washed scandium hydroxide precipitate with hydrochloric acid, controlling the pH value to be less than or equal to 2, adding hydrogen peroxide, and heating to 60 ℃ until no obvious Fe exists2+Adding excessive oxalic acid to form scandium oxalate precipitate; extracting scandium oxalate precipitate, and washing with oxalic acid solution; and obtaining the washed scandium oxalate precipitate, and roasting to obtain the high-purity scandium oxide.
The invention also discloses the refined scandium oxide, and the refined scandium oxide is prepared by the method.
Further, the refined scandium oxide contains Fe2O3≤10ppm、Zr2O3≤30ppm、TiO2≤50ppm、SiO2≤20ppm、CaO≤30ppm、Na2O≤10ppm、ThO2Less than or equal to 10ppm and less than or equal to 100ppm of rare earth impurities.
Compared with the prior art, the method can precipitate the titanium, the zirconium and the rare earth elements by utilizing the hydrolysis process so as to achieve the effect of impurity removal, and the adopted chemical reagents are common chemical reagents and have low price.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.
Examples
The method for purifying the refined scandium oxide comprises the following steps:
s1 acidolysis process: mixing crude scandium oxide (Sc)2O3Not less than 95 percent) is dissolved by analytically pure hydrochloric acid to obtain a solution;
s2 hydrolysis process: adding analytically pure NaOH to the solution, adjusting the pH to 2, adding a certain amount of analytically pure Na2SO4(1.2-2.5 times of molar weight of zirconium element, 2 times of the molar weight of the zirconium element in the embodiment of the invention) and mandelic acid (2.5-5 times of the molar weight of rare earth element, 4 times of the molar weight of the rare earth element in the embodiment of the invention) to perform hydrolysis reaction, filtering the precipitate, and collecting filtrate;
s3 precipitation and water washing process: precipitating the filtrate with analytically pure ammonia water (adjusting pH value to 9), and removing the filtrate to obtain scandium hydroxide precipitate; washing scandium hydroxide precipitate with appropriate amount of 60 deg.C hot distilled water (0.01-10 times of weight of scandium hydroxide, in the embodiment of the invention, 0.1 times of distilled water) to keep pH value of the washed raffinate at 7.5 or more;
s4 oxidative precipitation process: dissolving the washed scandium hydroxide precipitate with analytically pure hydrochloric acid, adjusting the pH value to be less than or equal to 2, adding a proper amount of hydrogen peroxide (1.2-3 times of the molar amount of the iron element, in the embodiment of the invention, 1.5 times of the molar amount of the iron element), heating to 60 ℃ → adding excessive analytically pure oxalic acid (2.5 times of the molar amount of the scandium element) to precipitate scandium oxalate; spin-drying the scandium oxalate precipitate by using a centrifugal machine, and continuously washing once by using an oxalic acid solution; and (4) drying the scandium oxalate precipitate, and roasting to obtain high-purity scandium oxide.
Wherein, the adopted coarse scandium oxide of the embodiment of the invention has Sc2O3 more than or equal to 95 percent, which contains a large amount of impurities, and the content of Fe is determined to be2O3About 300ppm, Zr2O3About 1000ppm, TiO2About 2000ppm, SiO2About 500ppm CaO, about 500ppm Na2O about 500ppm, ThO2About 100ppm, about 1000ppm rare earth impurities, etc
The refined scandium oxide generally refers to national standard 3N scandium oxide and national standard 4N scandium oxide, particularly the national standard 4N scandium oxide, is a mainstream product in the current market of the refined scandium oxide, and the refined scandium oxide obtained by the embodiment of the invention conforms to the national standard 4N scandium oxide through detection, namely the refined scandium oxide contains Fe2O3≤10ppm、Zr2O3≤30ppm、TiO2≤50ppm、SiO2≤20ppm、CaO≤30ppm、Na2O≤10ppm、ThO2Less than or equal to 10ppm and less than or equal to 100ppm of rare earth impurities.
Compared with the traditional production method, the embodiment of the invention has the following advantages:
1. compared with the traditional scandium oxide purification method, the method has fewer steps and is easy to expand the yield scale;
2. the method adopts a pure chemical method, compared with the prior art, the method avoids the use of oxygen-containing organic matters (P350) and nitrogen-containing organic matters (N235), and the adopted organic matters mainly form precipitates, so that the method is convenient to collect, reduces the environmental protection treatment cost and is more environment-friendly;
3. in the traditional method, P350 and N235 are both expensive extracting agents, the production method has high cost, particularly the price of P350 reaches 35 ten thousand yuan/ton, and the chemical reagents adopted by the method are all common chemical reagents and are low in price;
4. the method adds a certain amount of analytically pure Na in the hydrolysis process2SO4A certain amount of mandelic acid can make titanium, zirconium and rare earth impurities form precipitates in a targeted manner, thereby achieving the purpose of removing the impurities; hydrolyzing titanium at pH 2 to produce metatitanic acid precipitate; zirconium and mandelic acid form a double salt precipitate; rare earth impurities and sodium sulfate form double salt precipitates, scandium ions and sodium sulfate only form a very small amount of precipitates, and most scandium still exists in the solution in the form of ions, so that the effect of removing various impurities in one step is achieved;
5. in the process of oxidative precipitation, dissolving the washed scandium hydroxide precipitate with analytically pure hydrochloric acid, controlling the pH value to be less than or equal to 2, adding a proper amount of hydrogen peroxide, oxidizing incompletely removed Fe2+ into Fe3+, and utilizing a complex formed by oxalic acid and Fe3+ to avoid precipitation so as to achieve the purpose of separating scandium oxalate; meanwhile, the residual titanium ions and hydrogen peroxide form a non-precipitated complex, so that the aim of separating titanium from scandium is fulfilled;
6. compared with the traditional method, the method has the advantages that the used reagents are cheap and the cost is lower, the cost of raw materials required by the traditional method for purifying scandium oxide is about 560 yuan/kg (namely the cost required by purifying one kilogram of scandium oxide), and the cost of the raw materials required by the method for purifying scandium oxide is about 180 yuan/kg.
Finally, it should be noted that the above-mentioned embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above-mentioned embodiments, it should be understood by those skilled in the art that the modifications and equivalents of the specific embodiments of the present invention can be made by those skilled in the art after reading the present specification, but these modifications and variations do not depart from the scope of the claims of the present application.
Claims (10)
1. A method for purifying refined scandium oxide, the method comprising a hydrolysis process: and (3) taking a metal solution obtained after the coarse scandium oxide is dissolved in acid, adjusting the pH value, adding sulfate and organic acid, precipitating impurities in the coarse scandium oxide, and realizing the separation of the impurities in the coarse scandium oxide, wherein the impurities at least comprise one of titanium, zirconium and rare earth elements.
2. The method for purifying refined scandium oxide according to claim 1, wherein the method specifically includes:
s1 acidolysis process: dissolving crude scandium oxide with hydrochloric acid to form a solution;
s2 hydrolysis process: adjusting the pH to 2 and adding Na2SO4And mandelic acid, filtering;
s3 precipitation and water washing process: adjusting the pH of the filtrate in the hydrolysis process to form scandium hydroxide precipitate, filtering and washing;
s4 oxidative precipitation process: dissolving the washed solid with hydrochloric acid, adding an oxidant, heating, adding an organic acid capable of forming a precipitate with scandium into the solution to form an organic acid salt of scandium, and drying and roasting to obtain the high-purity scandium oxide.
3. The method of purifying refined scandium oxide as claimed in claim 1, wherein Sc in said crude scandium oxide2O3Not less than 95%, and the coarse scandium oxide at least contains Fe2O3、Zr2O3、TiO2、SiO2、CaO、Na2O、ThO2And rare earth impurities.
4. The method of purifying refined scandium oxide according to claim 3, wherein the crude scandium oxide contains Fe2O3 200-400ppm、Zr2O3 900-1100ppm、TiO2 1900-2100ppm、SiO2 400-600ppm、CaO 400-600ppm、Na2O 400-600ppm、ThO290-110ppm, and 900-.
5. The method of purifying refined scandium oxide according to claim 1, wherein the impurities include titanium, zirconium, rare earth elements, and the organic acid is an organic acid capable of forming a double salt precipitate with zirconium.
6. The method of claim 5, wherein the organic acid is mandelic acid and the sulfate is Na2SO4。
7. The method for purifying refined scandium oxide according to claim 2, wherein the S3 precipitation water washing process includes: adding pure ammonia water into the filtrate until scandium hydroxide precipitate is formed, and removing the filtrate to obtain scandium hydroxide precipitate; washing scandium hydroxide precipitate with 40-80 deg.C distilled water, wherein the pH value of the washed raffinate is not less than 7.5.
8. The method for purifying refined scandium oxide according to claim 2, wherein the S4 oxidative precipitation process includes: dissolving the washed scandium hydroxide precipitate with hydrochloric acid, controlling the pH value to be less than or equal to 2, adding hydrogen peroxide, and heating to 60 ℃ until no obvious Fe exists2+Adding excessive oxalic acid to form scandium oxalate precipitate; extracting scandium oxalate precipitate, and washing with oxalic acid solution; and obtaining the washed scandium oxalate precipitate, and roasting to obtain the high-purity scandium oxide.
9. A refined scandium oxide, which is produced by the method according to any one of claims 1 to 8.
10. The method of purifying refined scandium oxide according to claim 1, wherein the refined scandium oxide contains Fe2O3≤10ppm、Zr2O3≤30ppm、TiO2≤50ppm、SiO2≤20ppm、CaO≤30ppm、Na2O≤10ppm、ThO2Less than or equal to 10ppm, and less than or equal to 100ppm of rare earth impurities。
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| CN202111674277.9A CN114314632A (en) | 2021-12-31 | 2021-12-31 | Method for purifying refined scandium oxide |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102863004A (en) * | 2011-07-05 | 2013-01-09 | 北京有色金属研究总院 | Purification and preparation method of high-purity scandium oxide |
| CN106629809A (en) * | 2016-12-20 | 2017-05-10 | 攀枝花市精研科技有限公司 | Method for purifying coarse scandium oxide |
| US20170321301A1 (en) * | 2014-11-26 | 2017-11-09 | Sumitomo Metal Mining Co., Ltd. | Method for recovering high-purity scandium |
| CN113307298A (en) * | 2021-07-08 | 2021-08-27 | 湖南金坤新材料有限公司 | Method for producing high-purity scandium oxide from scandium oxide concentrate |
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- 2021-12-31 CN CN202111674277.9A patent/CN114314632A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102863004A (en) * | 2011-07-05 | 2013-01-09 | 北京有色金属研究总院 | Purification and preparation method of high-purity scandium oxide |
| US20170321301A1 (en) * | 2014-11-26 | 2017-11-09 | Sumitomo Metal Mining Co., Ltd. | Method for recovering high-purity scandium |
| CN106629809A (en) * | 2016-12-20 | 2017-05-10 | 攀枝花市精研科技有限公司 | Method for purifying coarse scandium oxide |
| CN113307298A (en) * | 2021-07-08 | 2021-08-27 | 湖南金坤新材料有限公司 | Method for producing high-purity scandium oxide from scandium oxide concentrate |
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Application publication date: 20220412 |