Comparative Analysis of Sulfation Roasting-Water Leaching Process for Recovery of NdFeB and CeFeB Wastes AITranslate
Abstract AITranslate
A separate CeO2phase appears in the oxidized material of CeFeB waste and changes its valence state during the sulfation roasting process,which differs from NdFeB waste.Therefore,this paper conducted a comparative analysis of the sulfation roasting process of the oxidized materials of these two wastes.The research results show that the highest sulfation rates of the oxidized materials of NdFeB and CeFeB wastes are 91.7%and 96.1%,respectively.The sulfation process of the former mainly occurs in the medium-temperature roasting stage,while that of the latter mainly occurs in the low-temperature infiltration stage with the generation of an intermediate Ce(SO4)2in the medium-temperature roasting stage.The final products of sulfation roasting for both are Fe2O3and RE2(SO4)3.Their high-temperature roasted materials have an loose structure with uneven pore size,and most of the rare earth-rich phases are encapsulated by the non-rare earth phases.Apart from CeO2,the roasting mechanism of the CeFeB waste is consistent with that of the NdFeB waste:rare earth oxides and Fe2O3reacts with sulfuric acid to generate water-soluble rare earth sulfates and Fe2(SO4)3;Fe2SO43is decomposed into Fe2O3and SO3at high temperature,and SO3further reacts with unreacted rare earth oxides to generate rare earth sulfates.CeO2reacts with sulfuric acid to form Ce(SO42at first,which is then decomposed into Ce2(SO4)3.The SO3generated during the decomposition process further reacts with CeO2to generate water-soluble Ce2(SO4)3.
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Basic Information:
DOI：
Chinese Library Classification Number:TM273[一般工业技术—材料科学与工程]
Citation Information:
A separate CeO2phase appears in the oxidized material of CeFeB waste and changes its valence state during the sulfation roasting process,which differs from NdFeB waste.Therefore,this paper conducted a comparative analysis of the sulfation roasting process of the oxidized materials of these two wastes.The research results show that the highest sulfation rates of the oxidized materials of NdFeB and CeFeB wastes are 91.7%and 96.1%,respectively.The sulfation process of the former mainly occurs in the medium-temperature roasting stage,while that of the latter mainly occurs in the low-temperature infiltration stage with the generation of an intermediate Ce(SO4)2in the medium-temperature roasting stage.The final products of sulfation roasting for both are Fe2O3and RE2(SO4)3.Their high-temperature roasted materials have an loose structure with uneven pore size,and most of the rare earth-rich phases are encapsulated by the non-rare earth phases.Apart from CeO2,the roasting mechanism of the CeFeB waste is consistent with that of the NdFeB waste:rare earth oxides and Fe2O3reacts with sulfuric acid to generate water-soluble rare earth sulfates and Fe2(SO4)3;Fe2SO43is decomposed into Fe2O3and SO3at high temperature,and SO3further reacts with unreacted rare earth oxides to generate rare earth sulfates.CeO2reacts with sulfuric acid to form Ce(SO42at first,which is then decomposed into Ce2(SO4)3.The SO3generated during the decomposition process further reacts with CeO2to generate water-soluble Ce2(SO4)3.
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| GB/T 7714-2015 | [1] DENG Yong-chun, YUAN Lu, LI Yu-hang, et al. Comparative Analysis of Sulfation Roasting-Water Leaching Process for Recovery of NdFeB and CeFeB Wastes[J]. Rare Metals and Cemented Carbides, 2023(4): 1-7. |
| MLA | [1] DENG Yong-chun, et al., "Comparative Analysis of Sulfation Roasting-Water Leaching Process for Recovery of NdFeB and CeFeB Wastes." Rare Metals and Cemented Carbides, no. 4, 2023, pp. 1-7. |
| APA | [1] DENG Yong-chun, YUAN Lu, LI Yu-hang, XIN Wen-bin, JIANG Yin-ju, & WANG Liang. (2023). Comparative Analysis of Sulfation Roasting-Water Leaching Process for Recovery of NdFeB and CeFeB Wastes. Rare Metals and Cemented Carbides(4), 1-7. |
| IEEE | [1] DENG Yong-chun, YUAN Lu, LI Yu-hang, XIN Wen-bin, JIANG Yin-ju, and WANG Liang, "Comparative Analysis of Sulfation Roasting-Water Leaching Process for Recovery of NdFeB and CeFeB Wastes," Rare Metals and Cemented Carbides, no. 4, pp. 1-7, 2023. keywords: {NdFeB;CeFeB;waste recovery;sulfation roasting;water leaching;roasting mechanism} |