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首页> 美国政府科技报告 >Hydrometallurgical Recovery of Critical Metals from Hardface Alloy Grinding Waste: A Laboratory Study
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Hydrometallurgical Recovery of Critical Metals from Hardface Alloy Grinding Waste: A Laboratory Study

机译：从硬面合金研磨废料中湿法冶金回收关键金属：实验室研究

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Research was conducted to improve technology for the recovery of critical metals from hardface alloy grinding waste, a form of superalloy scrap. The report describes a hydrometallurgical process that demonstrated on a laboratory scale that 79% of the chromium, 97% of the cobalt, 99% of the manganese, 99% of the nickel, and 90% of the tungsten could be recovered in chemical form from hardface alloy grinding waste. The process involved deoiling the grinding waste, followed by chloride-based dissolution of the deoiled material. A high-grade calcium tungstate (CaWO4) product was recovered from the resultant leach residue by caustic leaching and precipitation. Iron, cobalt, manganese, and nickel chlorides were sequentially recovered from the leach liquor by solvent extraction. Amine extractants were used to extract the iron, cobalt, and manganese; decanal oxime was used to extract the nickel. Market-grade cobalt chloride (CoCl2), manganese chloride (MnCl2), and nickel chloride (NiCl2) products could be produced directly from the resultant strip liquors. The final raffinate was a relatively pure chromic chloride (CrCl3) solution that compared favorably with commercial solutions.

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