CPC C01F 17/13 (2020.01) [C01F 17/282 (2020.01); C01G 31/003 (2013.01); C22B 3/42 (2013.01); C22B 34/225 (2013.01); C22B 61/00 (2013.01); C01P 2006/80 (2013.01)] | 16 Claims |
1. A selective recovery method of vanadium and cesium from a waste sulfuric acid vanadium catalyst containing vanadium, cesium, iron, silica, aluminum, potassium, sodium, calcium and titanium by a hydrometallurgical method including water leaching, solid-liquid separation, vanadium solvent extraction, vanadium selective stripping and cesium alum production, the selective recovery method comprising the steps of:
(a-1) crushing and pulverizing a waste sulfuric acid vanadium catalyst;
(a-2) water-leaching the crushed and pulverized waste sulfuric acid vanadium catalyst and then solid-liquid separating to prepare a waste sulfuric acid vanadium water leachate containing vanadium and cesium in a cationic state;
(a-3) adding an organic solvent as a cation exchange extractant to the waste sulfuric acid vanadium water leachate containing vanadium and cesium in the cationic state to obtain a vanadium organic extract from which vanadium is solvent-extracted and a raffinate aqueous solution remaining after the solvent extraction of vanadium;
(a-4) preparing a vanadium aqueous solution by adding an alkali aqueous solution to the vanadium organic extract to selectively strip vanadium; and
(a-5) selectively recovering cesium from cesium alum precipitated by adding and reacting an aluminum compound to the raffinate aqueous solution obtained after the vanadium solvent extraction and cooling a mixture.
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