CN116790918A - Method for recycling scandium from P204 extraction nickel cobalt empty organic phase - Google Patents
Method for recycling scandium from P204 extraction nickel cobalt empty organic phase Download PDFInfo
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- CN116790918A CN116790918A CN202310617408.2A CN202310617408A CN116790918A CN 116790918 A CN116790918 A CN 116790918A CN 202310617408 A CN202310617408 A CN 202310617408A CN 116790918 A CN116790918 A CN 116790918A
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- 229910052706 scandium Inorganic materials 0.000 title claims abstract description 122
- SIXSYDAISGFNSX-UHFFFAOYSA-N scandium atom Chemical compound [Sc] SIXSYDAISGFNSX-UHFFFAOYSA-N 0.000 title claims abstract description 122
- 238000000605 extraction Methods 0.000 title claims abstract description 86
- 239000012074 organic phase Substances 0.000 title claims abstract description 64
- QXZUUHYBWMWJHK-UHFFFAOYSA-N [Co].[Ni] Chemical compound [Co].[Ni] QXZUUHYBWMWJHK-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000004064 recycling Methods 0.000 title claims abstract description 13
- 239000002244 precipitate Substances 0.000 claims abstract description 22
- HYXGAEYDKFCVMU-UHFFFAOYSA-N scandium oxide Chemical compound O=[Sc]O[Sc]=O HYXGAEYDKFCVMU-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000001914 filtration Methods 0.000 claims abstract description 11
- 230000001376 precipitating effect Effects 0.000 claims abstract description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 57
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 39
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 36
- 239000003513 alkali Substances 0.000 claims description 29
- 235000006408 oxalic acid Nutrition 0.000 claims description 13
- 238000001556 precipitation Methods 0.000 claims description 8
- 239000012535 impurity Substances 0.000 abstract description 21
- 230000000694 effects Effects 0.000 abstract description 14
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 11
- 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 description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 230000001276 controlling effect Effects 0.000 description 8
- 238000002386 leaching Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 229910052759 nickel Inorganic materials 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 238000003556 assay Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 238000007127 saponification reaction Methods 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- 238000004090 dissolution Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910021654 trace metal Inorganic materials 0.000 description 2
- OCKGFTQIICXDQW-ZEQRLZLVSA-N 5-[(1r)-1-hydroxy-2-[4-[(2r)-2-hydroxy-2-(4-methyl-1-oxo-3h-2-benzofuran-5-yl)ethyl]piperazin-1-yl]ethyl]-4-methyl-3h-2-benzofuran-1-one Chemical compound C1=C2C(=O)OCC2=C(C)C([C@@H](O)CN2CCN(CC2)C[C@H](O)C2=CC=C3C(=O)OCC3=C2C)=C1 OCKGFTQIICXDQW-ZEQRLZLVSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- UUCGKVQSSPTLOY-UHFFFAOYSA-J cobalt(2+);nickel(2+);tetrahydroxide Chemical compound [OH-].[OH-].[OH-].[OH-].[Co+2].[Ni+2] UUCGKVQSSPTLOY-UHFFFAOYSA-J 0.000 description 1
- 229910052598 goethite Inorganic materials 0.000 description 1
- 239000000413 hydrolysate Substances 0.000 description 1
- AEIXRCIKZIZYPM-UHFFFAOYSA-M hydroxy(oxo)iron Chemical compound [O][Fe]O AEIXRCIKZIZYPM-UHFFFAOYSA-M 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910001710 laterite Inorganic materials 0.000 description 1
- 239000011504 laterite Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The application discloses a method for recycling scandium from a P204 extraction nickel cobalt empty organic phase, which comprises the following steps: s1: carrying out back extraction on the P204 extracted nickel cobalt empty organic phase to obtain a precipitate; s2: dissolving the precipitate obtained in the step S1, and filtering to obtain scandium-containing solution; s3: scandium extraction and back extraction are carried out on the scandium-containing solution, so as to obtain a purified scandium-containing solution; s4: precipitating the purified scandium-containing solution to obtain scandium precipitate; s5: and burning the scandium precipitate to obtain scandium oxide. The method for recycling scandium from the P204 extraction nickel cobalt empty organic phase provided by the application can fully recycle scandium in the P204 extraction nickel cobalt empty organic phase, and simultaneously can ensure that the P204 extractant in the P204 extraction nickel cobalt empty organic phase has the effect of purifying and removing impurities, thereby increasing the activity of the P204 extractant and improving the processing capacity of the P204 extractant.
Description
Technical Field
The application relates to the technical field of valuable metal recovery, in particular to a method for recovering scandium from a P204 extraction nickel cobalt empty organic phase.
Background
At present, laterite-nickel ore is a main raw material for extracting metallic nickel at home and abroad, and is a large-scale oxidation type ore deposit, so that the laterite-nickel ore is rich in nickel and cobalt resources and contains trace scandium, and is mainly accompanied in goethite and bauxite of the laterite-nickel ore. Therefore, scandium is also enriched to a certain extent in the high-pressure acid leaching wet smelting process of the laterite-nickel ore. In the production practice process, laterite nickel ore is preprocessed into nickel cobalt hydroxide intermediate products serving as raw materials through a high-pressure acid leaching mode, nickel cobalt leaching liquid is prepared through an acid leaching process, and then P204 extractant is used for purifying and removing impurities of the nickel cobalt leaching liquid. Sc in the leaching solution is extracted into an organic phase together with impurity elements such as Ca, zn, fe and the like in the extraction and impurity removal process, ca, zn, fe and the like can be reversely reduced from the organic phase in the back extraction process, but Sc is not paid attention to due to the fact that the content of the Sc is low and is about 0.02-0.03 g/L, the enrichment degree of Sc in the organic phase is higher and higher along with the improvement of productivity, the P204 extraction amount is occupied, the impurity extraction rate and the extraction effect are reduced, and valuable metal scandium cannot be fully recovered.
Disclosure of Invention
The application aims to solve the problems that Sc in the prior art is high in enrichment degree in an organic phase, P204 extraction amount is occupied, and Sc cannot be fully recovered, and provides a method for recovering scandium from a P204 extraction nickel cobalt empty organic phase.
A method for recycling scandium from a P204 extraction nickel cobalt empty organic phase comprises the following steps:
s1: carrying out back extraction on the P204 extracted nickel cobalt empty organic phase to obtain a precipitate;
s2: dissolving the precipitate obtained in the step S1, and filtering to obtain scandium-containing solution;
s3: scandium extraction and back extraction are carried out on the scandium-containing solution, so as to obtain a purified scandium-containing solution;
s4: precipitating the purified scandium-containing solution to obtain scandium precipitate;
s5: and burning the scandium precipitate to obtain scandium oxide.
Further, scandium content in the P204 extraction nickel cobalt empty organic phase is not lower than 0.5g/L.
Further, in the step S1, the P204 extraction nickel cobalt empty organic phase is subjected to alkali stripping.
In the step S1, the non-load organic phase of the nickel-cobalt extracted by the P204 is subjected to sodium hydroxide stripping, wherein the concentration of the sodium hydroxide is 9.5-10.5 mol/L, the O/A of the sodium hydroxide stripping is 10-15:1, and the temperature of the sodium hydroxide stripping is 65-75 ℃.
Further, in S2, 100 to 200g/L of sulfuric acid is used to dissolve the precipitate obtained in S1.
Further, the pH of the solution after the sulfuric acid is dissolved is controlled to be 2-3.
Further, in the step S3, the scandium extraction extractant is one, two or three of P204, TBP or C272, and the O/A of scandium extraction is 1:3-5.
Further, in the step S3, the back-extracted extractant is one, two or three of P204, TBP or C272, and the back-extracted O/A is 2-3:1.
Further, in the step S4, an oxalic acid solution is adopted to precipitate the purified scandium-containing solution, the mass concentration of the oxalic acid solution is 10-15%, and the precipitation temperature is 60-80 ℃.
Further, in the step S5, the burning is performed at the temperature of 800-900 ℃ for 3-5 hours.
The method for recycling scandium from the P204 extraction nickel cobalt empty organic phase provided by the application can fully recycle scandium in the P204 extraction nickel cobalt empty organic phase, and simultaneously can ensure that the P204 extractant in the P204 extraction nickel cobalt empty organic phase has the effect of purifying and removing impurities, thereby increasing the activity of the P204 extractant and improving the processing capacity of the P204 extractant.
Detailed Description
A method for recycling scandium from a P204 extraction nickel cobalt empty organic phase comprises the following steps:
s1: carrying out back extraction on the P204 extracted nickel cobalt empty organic phase to obtain a precipitate;
s2: dissolving the precipitate obtained in the step S1, and filtering to obtain scandium-containing solution;
s3: scandium extraction and back extraction are carried out on the scandium-containing solution, so as to obtain a purified scandium-containing solution;
s4: precipitating the purified scandium-containing solution to obtain scandium precipitate;
s5: and burning the scandium precipitate to obtain scandium oxide.
In the embodiment, the research shows that after the P204 is used for extracting and removing impurities from the nickel leaching solution, trace metal scandium still enriched in the empty organic phase is not reversely extracted completely, so that the use effect and activity of the extractant are affected. Meanwhile, with the increase of the treatment capacity, the scandium in the empty organic phase is continuously enriched, and valuable metals are wasted without being recovered. According to the embodiment of the application, through carrying out alkali back extraction, alkali cake dissolution and filtration, scandium extraction and back extraction and scandium precipitation and scandium firing precipitation on the P204 nickel cobalt no-load organic phase, scandium in the empty organic phase is fully recovered, and meanwhile, the P204 extractant in the P204 nickel cobalt no-load organic phase can be purified and impurity-removed, so that the activity of the P204 extractant is increased, and the treatment capacity of the P204 extractant is improved.
Further, scandium content in the P204 extraction nickel cobalt empty organic phase is not lower than 0.5g/L.
In the embodiment, the research shows that after the P204 is used for extracting and removing impurities from the nickel cobalt leaching solution, trace metal scandium still enriched in the empty organic phase is not reversely extracted completely, so that the use effect and activity of the extractant are affected. Meanwhile, with the increase of the treatment capacity, the metal scandium in the empty organic phase can be continuously enriched by more than 0.5g/L, and valuable metal scandium can be wasted due to the fact that the metal scandium is not recycled.
Further, in the step S1, the P204 extraction nickel cobalt empty organic phase is subjected to alkali stripping. In the step S1, the P204 nickel cobalt extraction no-load organic phase is subjected to sodium hydroxide stripping, the concentration of sodium hydroxide is 9.5-10.5 mol/L, the O/A of the sodium hydroxide stripping is 10-15:1, and the temperature of the sodium hydroxide stripping is 65-75 ℃.
In this example, the alkali stripping reaction is carried out in an extraction tank, and impurities such as scandium and a small amount of iron in the organic phase precipitate in the form of an alkali cake. The concentration of sodium hydroxide is 9.5-10.5 mol/L, the stripping O/A is 10-15:1, and the stripping temperature is 65-75 ℃ in consideration of factors such as equipment use conditions and the like.
Further, in S2, 100 to 200g/L of sulfuric acid is used to dissolve the precipitate obtained in S1. Controlling the pH value of the solution after the sulfuric acid is dissolved to be 2-3.
In this example, sulfuric acid is used to dissolve the precipitate of the alkali cake obtained in S1, and any acid that can dissolve the alkali cake can be used, and sulfuric acid is preferred in this example because sulfuric acid is more compatible with the extractant P204, TBP or C272. The concentration of sulfuric acid is 100-200 g/L, alkali cake can be completely dissolved, the pH value of the solution is further controlled to be 2-3, the solution is filtered after the alkali cake is dissolved, and hydrolysate of impurities such as Fe can be filtered out, so that impurities can be removed to the greatest extent.
Further, in the step S3, the scandium extraction extractant is one, two or three of P204, TBP or C272, and the O/A of scandium extraction is 1:3-5.
In this embodiment, scandium extraction is performed to remove impurities from scandium-containing solution, thereby obtaining scandium oxide with higher purity. The extractant is scandium extraction reagent P204, TBP or C272, and the efficient extraction is realized by controlling the O/A, and the scandium and impurity separation effect is good.
Further, in the step S3, the back-extracted extractant is one, two or three of P204, TBP or C272, and the back-extracted O/A is 2-3:1.
In this embodiment, the stripping is also performed to remove impurities from the scandium-containing solution, thereby obtaining scandium oxide with higher purity. The extractant is scandium extraction reagent P204, TBP or C272, and the extraction is performed efficiently by controlling the back extraction O/A, and the scandium and impurity separation effect is good.
Further, in the step S4, an oxalic acid solution is adopted to precipitate the purified scandium-containing solution, the mass concentration of the oxalic acid solution is 10-15%, and the precipitation temperature is 60-80 ℃. In the step S5, the burning is carried out at the temperature of 800-900 ℃ for 3-5 hours.
In the embodiment, the scandium-containing solution is precipitated by oxalic acid, the high-quality concentration of oxalic acid is controlled to be 10-15%, the high temperature of precipitation is controlled to be 60-80 ℃, the granularity of scandium oxalate is large, and the impurity separation effect is good.
Example 1A method for recovering scandium from a P204 extraction Nickel cobalt empty organic phase
A method for recycling scandium from a P204 extraction nickel cobalt empty organic phase comprises the following steps:
s1: 120L of P204 extracted nickel cobalt empty organic phase and 10L of 10N sodium hydroxide are taken, and compared with O: a=12:1, the temperature is controlled at 70 ℃, stirring is carried out for 30min, the reaction is stopped, the organic saponification rate is 65%, and an alkali cake is obtained, and the alkali cake is analyzed by an assay, wherein the Sc content is 5.24%, and the Fe content is 2.53%.
S2: dissolving the alkali cake with 150g/L sulfuric acid solution, controlling the pH of the solution to be 2.5, and filtering to obtain scandium-containing solution.
S3: using a P204 and TBP mixed extractant, scandium-containing solutions were prepared according to O: a=1:4 scandium extraction, O: back extraction was performed at a=2.5:1 to obtain a purified scandium-containing solution.
S4: and heating the purified scandium-containing solution to 70 ℃ in a water bath, and adding oxalic acid solution with the concentration of 12.5% to precipitate to obtain scandium oxalate.
S5: scandium oxalate is washed and then put into a muffle furnace to be burnt for 3 hours at 800 ℃ to obtain scandium oxide with the purity of 99 percent.
Example 2A method for recovering scandium from a P204 extract nickel cobalt empty organic phase
A method for recycling scandium from a P204 extraction nickel cobalt empty organic phase comprises the following steps:
s1: 85L of P204 extracted nickel-cobalt empty organic phase and 8.5L of sodium hydroxide with the concentration of 9.5N are taken, and compared with O: a=10:1, the temperature is controlled at 65 ℃, stirring is carried out for 30min, the standing is carried out, the organic saponification rate is 63.5%, and an alkali cake is obtained, and the content of Sc is 5.13% and the content of Fe is 2.25% through assay analysis.
S2: dissolving the alkali cake with 100g/L sulfuric acid solution, controlling the pH of the solution to be 3, and filtering to obtain scandium-containing solution.
S3: using a P204 and TBP mixed extractant, scandium-containing solutions were prepared according to O: a=1:3 scandium extraction, O: and (3) carrying out back extraction on the solution A=2:1 to obtain a scandium-containing solution after purification.
S4: and heating the purified scandium-containing solution to 60 ℃ in a water bath, and adding an oxalic acid solution with the concentration of 10% to precipitate to obtain scandium oxalate.
S5: scandium oxalate is washed and then put into a muffle furnace to be burnt for 5 hours at 900 ℃ to obtain scandium oxide with 99% purity.
Example 3A method for recovering scandium from a P204 extraction Nickel cobalt empty organic phase
A method for recycling scandium from a P204 extraction nickel cobalt empty organic phase comprises the following steps:
s1: 120L of P204 extracted nickel cobalt empty organic phase and 8.0L of 10.5N sodium hydroxide are taken, and compared with O: a=15:1, the temperature is controlled at 75 ℃, stirring is carried out for 30min, the reaction is stopped, the organic saponification rate is 66.9%, and an alkali cake is obtained, and the content of Sc is 4.98% and the content of Fe is 2.10% through assay analysis.
S2: dissolving the alkali cake with 200g/L sulfuric acid solution, controlling the pH of the solution to be 2, and filtering to obtain scandium-containing solution.
S3: using a P204 and TBP mixed extractant, scandium-containing solutions were prepared according to O: a=1:5 scandium extraction, O: and (3) carrying out back extraction on the solution A=3:1 to obtain a scandium-containing solution after purification.
S4: and heating the purified scandium-containing solution to 80 ℃ in a water bath, and adding an oxalic acid solution with the concentration of 15% to precipitate to obtain scandium oxalate.
S5: scandium oxalate is washed and then put into a muffle furnace to be burnt for 3 hours at 800 ℃ to obtain scandium oxide with the purity of 99 percent.
In the method for recovering scandium from the P204 extraction nickel cobalt empty organic phase in embodiments 1-3, scandium oxide with purity up to 99% is obtained through alkali back extraction, alkali cake dissolution and filtration, scandium extraction and back extraction of scandium-containing solution, scandium precipitation and scandium firing precipitation.
Comparative example 1 method for recovering scandium from P204 extract nickel cobalt empty organic phase
A method for recycling scandium from a P204 extraction nickel cobalt empty organic phase comprises the following steps:
s1: 120L of P204 extracted nickel cobalt empty organic phase and 10L of 10N sodium hydroxide are taken, and compared with O: a=12:1, the temperature is controlled at 70 ℃, stirring is carried out for 30min, the reaction is stopped, the organic saponification rate is 65%, and an alkali cake is obtained, and the alkali cake is analyzed by an assay, wherein the Sc content is 5.24%, and the Fe content is 2.53%.
S2: dissolving the alkali cake with 150g/L sulfuric acid solution, controlling the pH of the solution to be 2.5, and filtering to obtain scandium-containing solution.
S3: and heating the purified scandium-containing solution to 70 ℃ in a water bath, and adding oxalic acid solution with the concentration of 12.5% to precipitate to obtain scandium oxalate.
S4: scandium oxalate is washed and then put into a muffle furnace to be burned for 3 hours at 800 ℃ to obtain scandium oxide with purity lower than 90%, and the scandium oxide is visually observed to be pale yellow or pale yellow and is higher in impurity.
Comparative example 1 differs from example 1 in that: the scandium-containing solution obtained in step 2 was not subjected to scandium extraction and back extraction, and as shown in the result of comparative example 1, although the impurities were removed by sodium hydroxide back extraction and sulfuric acid dissolution of the alkali cake, the impurity content was still relatively high, scandium oxide could not be directly extracted, and further impurity removal treatment was required.
Comparative example 2 method for recovering scandium from P204 extract nickel cobalt empty organic phase
A method for recycling scandium from a P204 extraction nickel cobalt empty organic phase comprises the following steps:
s1: 120L of P204 extracted nickel cobalt empty organic phase and 10L of 10N sodium hydroxide are taken, and compared with O: a=12:1, the temperature is controlled at 70 ℃, stirring is carried out for 30min, the reaction is stopped, the organic saponification rate is 65%, and an alkali cake is obtained, and the alkali cake is analyzed by an assay, wherein the Sc content is 5.24%, and the Fe content is 2.53%.
S2: dissolving the alkali cake with 150g/L sulfuric acid solution, controlling the pH of the solution to be 1.0, and filtering to obtain scandium-containing solution.
S3: using a P204 and TBP mixed extractant, scandium-containing solutions were prepared according to O: a=1:4 scandium extraction, O: back extraction was performed at a=2.5:1 to obtain a purified scandium-containing solution.
S4: and heating the purified scandium-containing solution to 70 ℃ in a water bath, and adding oxalic acid solution with the concentration of 12.5% to precipitate to obtain scandium oxalate.
S5: scandium oxalate is washed and then put into a muffle furnace to be burnt for 3 hours at 800 ℃ to obtain scandium oxide with 92% purity.
Comparative example 2 differs from example 1 in that: in step S2, the pH of the solution is controlled to 1. The scandium oxide obtained in comparative example 2 was 92% pure and low in purity. From the results of comparative example 2, it is seen that dissolution of the alkali cake precipitate obtained by S1 with sulfuric acid, which is not adjusted to a suitable pH, results in low purity of the final scandium oxide; the pH value of the sulfuric acid dissolved alkali cake solution is regulated to be 2-3, so that the deep impurity removal effect can be achieved.
It will be readily appreciated by those skilled in the art that the above advantageous ways can be freely combined and superimposed without conflict. The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the application. The foregoing is merely a preferred embodiment of the present application, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present application, and these modifications and variations should also be regarded as the scope of the application.
Claims (10)
1. A method for recycling scandium from a P204 extraction nickel cobalt empty organic phase, which is characterized in that: the specific method comprises the following steps:
s1: carrying out back extraction on the P204 extracted nickel cobalt empty organic phase to obtain a precipitate;
s2: dissolving the precipitate obtained in the step S1, and filtering to obtain scandium-containing solution;
s3: scandium extraction and back extraction are carried out on the scandium-containing solution, so as to obtain a purified scandium-containing solution;
s4: precipitating the purified scandium-containing solution to obtain scandium precipitate;
s5: and burning the scandium precipitate to obtain scandium oxide.
2. The method for recovering scandium from P204 extraction nickel cobalt empty organic phase according to claim 1, wherein: scandium content in the P204 extracted nickel-cobalt empty organic phase is not less than 0.5g/L.
3. The method for recovering scandium from P204 extraction nickel cobalt empty organic phase according to claim 1, wherein: in the step S1, the P204 extracted nickel cobalt empty organic phase is subjected to alkali back extraction.
4. A process for recovering scandium from a P204 extraction nickel cobalt empty organic phase according to claim 3, wherein: in the step S1, the P204 nickel cobalt extraction no-load organic phase is subjected to sodium hydroxide stripping, the concentration of sodium hydroxide is 9.5-10.5 mol/L, the O/A of the sodium hydroxide stripping is 10-15:1, and the temperature of the sodium hydroxide stripping is 65-75 ℃.
5. The method for recovering scandium from P204 extraction nickel cobalt empty organic phase according to claim 1, wherein: in the step S2, 100-200 g/L sulfuric acid is used for dissolving the precipitate obtained in the step S1.
6. The method for recovering scandium from P204 extraction nickel cobalt empty organic phase according to claim 5 wherein: controlling the pH value of the solution after the sulfuric acid is dissolved to be 2-3.
7. The method for recovering scandium from P204 extraction nickel cobalt empty organic phase according to claim 1, wherein: in the step S3, the scandium extraction extractant is one, two or three of P204, TBP or C272, and the O/A of scandium extraction is 1:3-5.
8. The method for recovering scandium from P204 extraction nickel cobalt empty organic phase according to claim 1, wherein: in the step S3, the back-extracted extractant is one, two or three of P204, TBP or C272, and the back-extracted O/A is 2-3:1.
9. The method for recovering scandium from P204 extraction nickel cobalt empty organic phase according to claim 1, wherein: in the step S4, the purified scandium-containing solution is precipitated by adopting oxalic acid solution, the mass concentration of the oxalic acid solution is 10-15%, and the precipitation temperature is 60-80 ℃.
10. The method for recovering scandium from P204 extraction nickel cobalt empty organic phase according to claim 8, wherein: in the step S5, the burning is carried out at the temperature of 800-900 ℃ for 3-5 hours.
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