Basic Sulfate Precipitation of Zirconium from Sulfuric Acid Leach Solution
H<sub>2</sub>SO<sub>4</sub> was ensured to be the best candidate for Zr leaching from the eudialyte. The resulting sulfuric leach solution consisted of Zr(IV), Nb(V), Hf(IV), Al(III), and Fe(III). It was found that ordinary metal hydroxide precipitation was not feasible for o...
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MDPI AG
2020-08-01
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| author | Yiqian Ma Srecko Stopic Xuewen Wang Kerstin Forsberg Bernd Friedrich |
| author_facet | Yiqian Ma Srecko Stopic Xuewen Wang Kerstin Forsberg Bernd Friedrich |
| author_sort | Yiqian Ma |
| collection | DOAJ |
| description | H<sub>2</sub>SO<sub>4</sub> was ensured to be the best candidate for Zr leaching from the eudialyte. The resulting sulfuric leach solution consisted of Zr(IV), Nb(V), Hf(IV), Al(III), and Fe(III). It was found that ordinary metal hydroxide precipitation was not feasible for obtaining a relatively pure product due to the co-precipitation of Al(III) and Fe(III). In this reported study, a basic zirconium sulfate precipitation method was investigated to recover Zr from a sulfuric acid leach solution of a eudialyte residue after rare earth elements extraction. Nb precipitated preferentially by adjusting the pH of the solution to around 1.0. After partial removal of SO<sub>4</sub><sup>2−</sup> by adding 120 g of CaCl<sub>2</sub> per 1L solution, a basic zirconium sulfate precipitate was obtained by adjusting the pH to ~1.6 and maintaining the solution at 75 °C for 60 min. Under the optimum conditions, the loss of Zr during the SO<sub>4</sub><sup>2</sup><sup>−</sup> removal step was only 0.11%, and the yield in the basic zirconium sulfate precipitation step was 96.18%. The precipitate contained 33.77% Zr and 0.59% Hf with low concentrations of Fe and Al. It was found that a high-quality product of ZrO<sub>2</sub> could be obtained from the basic sulfate precipitate. |
| first_indexed | 2024-03-10T17:30:49Z |
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| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T17:30:49Z |
| publishDate | 2020-08-01 |
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| series | Metals |
| spelling | doaj.art-97878f64a5e74986a22738d8579b3bdb2023-11-20T10:02:31ZengMDPI AGMetals2075-47012020-08-01108109910.3390/met10081099Basic Sulfate Precipitation of Zirconium from Sulfuric Acid Leach SolutionYiqian Ma0Srecko Stopic1Xuewen Wang2Kerstin Forsberg3Bernd Friedrich4Institute of Process Metallurgy and Metal Recycling (IME), RWTH Aachen University, Intzestraße 3, 52056 Aachen, GermanyInstitute of Process Metallurgy and Metal Recycling (IME), RWTH Aachen University, Intzestraße 3, 52056 Aachen, GermanySchool of Metallurgy and Environment, Central South University, Lushan South Road 932, Changsha 410083, ChinaDepartment of Chemical Engineering, KTH Royal Institute of Technology, Teknikringen 42, 11428 Stockholm, SwedenInstitute of Process Metallurgy and Metal Recycling (IME), RWTH Aachen University, Intzestraße 3, 52056 Aachen, GermanyH<sub>2</sub>SO<sub>4</sub> was ensured to be the best candidate for Zr leaching from the eudialyte. The resulting sulfuric leach solution consisted of Zr(IV), Nb(V), Hf(IV), Al(III), and Fe(III). It was found that ordinary metal hydroxide precipitation was not feasible for obtaining a relatively pure product due to the co-precipitation of Al(III) and Fe(III). In this reported study, a basic zirconium sulfate precipitation method was investigated to recover Zr from a sulfuric acid leach solution of a eudialyte residue after rare earth elements extraction. Nb precipitated preferentially by adjusting the pH of the solution to around 1.0. After partial removal of SO<sub>4</sub><sup>2−</sup> by adding 120 g of CaCl<sub>2</sub> per 1L solution, a basic zirconium sulfate precipitate was obtained by adjusting the pH to ~1.6 and maintaining the solution at 75 °C for 60 min. Under the optimum conditions, the loss of Zr during the SO<sub>4</sub><sup>2</sup><sup>−</sup> removal step was only 0.11%, and the yield in the basic zirconium sulfate precipitation step was 96.18%. The precipitate contained 33.77% Zr and 0.59% Hf with low concentrations of Fe and Al. It was found that a high-quality product of ZrO<sub>2</sub> could be obtained from the basic sulfate precipitate.https://www.mdpi.com/2075-4701/10/8/1099zirconiumeudialytehydrometallurgybasic sulfate precipitation |
| spellingShingle | Yiqian Ma Srecko Stopic Xuewen Wang Kerstin Forsberg Bernd Friedrich Basic Sulfate Precipitation of Zirconium from Sulfuric Acid Leach Solution Metals zirconium eudialyte hydrometallurgy basic sulfate precipitation |
| title | Basic Sulfate Precipitation of Zirconium from Sulfuric Acid Leach Solution |
| title_full | Basic Sulfate Precipitation of Zirconium from Sulfuric Acid Leach Solution |
| title_fullStr | Basic Sulfate Precipitation of Zirconium from Sulfuric Acid Leach Solution |
| title_full_unstemmed | Basic Sulfate Precipitation of Zirconium from Sulfuric Acid Leach Solution |
| title_short | Basic Sulfate Precipitation of Zirconium from Sulfuric Acid Leach Solution |
| title_sort | basic sulfate precipitation of zirconium from sulfuric acid leach solution |
| topic | zirconium eudialyte hydrometallurgy basic sulfate precipitation |
| url | https://www.mdpi.com/2075-4701/10/8/1099 |
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