A facile process to optimize performance of regenerated Nd-Fe-B sintered magnets: Chemo-selective dissolution washing - 文章详情页

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EI Scopus

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In　this　work,　the　recycled　Nd-Fe-B　powders　and　regenerated　Nd-Fe-B　sintered　magnets　with　low　impurity　content　were　successfully　prepared　from　Nd-Fe-B　magnet　sludge　via　reduction　diffusion　(RD)　method　followed　by　a　chemo-selective　dissolution　washing　process.　The　chemo-selective　dissolution　effect　of　various　solution　(deionized　water,　dilute　acetic　acid　solution,　NH4Cl-methanol　solution)　was　evaluated　by　impurity　content　and　magnetic　properties　of　the　recycled　Nd-Fe-B　powder.　The　NH4Cl-methanol　solution　can　selectively　remove　impurities　with　minimal　damage　to　the　magnetic　phase.　Besides,　the　optimal　NH4Cl　concentration　and　liquid-to-solid　ratio　were　investigated.　As　a　consequence,　the　contents　of　Ca,　O,　and　H　after　optimal　washing　process　are　reduced　to　0.07　wt%,　0.31　wt%　and　0.22　wt%,　respectively.　Hence,　M3　T　is　increased　to　146.72　emu/g,　which　is　33%　higher　than　that　of　the　initial　sludge.　Then,　the　regenerated　Nd-Fe-B　sintered　magnets　with　properties　of　Br　=　11.66　kG,　Hcj　=　16.49　kOe,　and　(BH)m　=　31.78　MGOe　were　successfully　prepared　by　mixing　with　40　wt%　Nd4Fe14B　alloy　powders.　Compared　with　the　corresponding　regenerated　magnets　washed　with　deionized　water,　the　remanence　and　coercivity　are　increased　by　18%　and　59%,　respectively.　©　2022　Chinese　Society　of　Rare　Earths

关键词：

Recycling Chlorine compounds Deionized water Rare earths Sintering Powders Washing Magnetic properties Methanol Iron alloys Dissolution Neodymium alloys

作者机构：

[ 1 ] [Xu, Haibo]College of Materials Science & Engineering, Key Lab of Advanced Functional Materials, Beijing University of Technology, Beijing; 100124, China
[ 2 ] [Xu, Haibo]Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou; 341119, China
[ 3 ] [Lu, Qingmei]College of Materials Science & Engineering, Key Lab of Advanced Functional Materials, Beijing University of Technology, Beijing; 100124, China
[ 4 ] [Yu, Lichao]College of Materials Science & Engineering, Key Lab of Advanced Functional Materials, Beijing University of Technology, Beijing; 100124, China
[ 5 ] [Cong, Liying]College of Materials Science & Engineering, Key Lab of Advanced Functional Materials, Beijing University of Technology, Beijing; 100124, China
[ 6 ] [Tian, Haowen]College of Materials Science & Engineering, Key Lab of Advanced Functional Materials, Beijing University of Technology, Beijing; 100124, China
[ 7 ] [Liu, Weiqiang]College of Materials Science & Engineering, Key Lab of Advanced Functional Materials, Beijing University of Technology, Beijing; 100124, China
[ 8 ] [Liu, Weiqiang]State Key Laboratory of Rare Earth Permanent Magnetic Materials, Hefei; 231500, China
[ 9 ] [Liu, Youhao]State Key Laboratory of Rare Earth Permanent Magnetic Materials, Hefei; 231500, China
[ 10 ] [Liu, Youhao]Earth-Panda Advanced Magnetic Materials Co., Ltd., Hefei; 231500, China
[ 11 ] [Wang, Yunqiao]Beijing Zhong Ke San Huan Research, Beijing; 102200, China
[ 12 ] [Chen, Jingwu]State Key Laboratory of Rare Earth Permanent Magnetic Materials, Hefei; 231500, China
[ 13 ] [Chen, Jingwu]Earth-Panda Advanced Magnetic Materials Co., Ltd., Hefei; 231500, China
[ 14 ] [Yi, Xiaofei]State Key Laboratory of Rare Earth Permanent Magnetic Materials, Hefei; 231500, China
[ 15 ] [Yi, Xiaofei]Earth-Panda Advanced Magnetic Materials Co., Ltd., Hefei; 231500, China
[ 16 ] [Wu, Qiong]College of Materials Science & Engineering, Key Lab of Advanced Functional Materials, Beijing University of Technology, Beijing; 100124, China
[ 17 ] [Yue, Ming]College of Materials Science & Engineering, Key Lab of Advanced Functional Materials, Beijing University of Technology, Beijing; 100124, China
[ 18 ] [Yue, Ming]State Key Laboratory of Rare Earth Permanent Magnetic Materials, Hefei; 231500, China

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