A kind of recovery method of rare earth in acid-dissolved slag of NdFeB waste
A recovery method and NdFeB technology are applied in the field of rare earth recovery from NdFeB waste acid slag, which can solve the problems of waste of resources, rising costs, and inability to fully recover rare earth elements.
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Embodiment 1
[0039] (1) 1.5t of NdFeB waste acid-dissolved slag (0.54% rare earth content measured by plasma spectrometry), 8m of tap water 3 and a mass concentration of 31% hydrochloric acid 0.1m 3 Mix and wash once at 95°C for 8 hours under stirring; add lime water to adjust the pH value to 4-4.5, and press filter to obtain the primary filtrate and primary filter residue; the rare earth content in the primary filter residue is 0.45%; the primary filtrate and the extraction material liquid mixed to extract rare earth salts;
[0040] (2) The primary filter residue obtained in the step (1) is mixed with water according to the solid-to-liquid ratio of 1000kg: 8m 3 Mixing, under the condition of stirring, carry out secondary water washing at 80 ℃ for 4h; then pressure filtration; obtain secondary filtrate and secondary filter residue; secondary filtrate is refluxed to step (1) as a washing agent for primary water washing; adopt plasma spectrometry The rare earth content in the secondary fil...
Embodiment 2
[0043] (1) 1.5t of NdFeB waste acid-dissolved slag (0.37% rare earth content measured by plasma spectrometry), 7m of tap water 3 and a mass concentration of 31% hydrochloric acid 0.1m 3 Mix and wash once at 95°C for 5 hours under stirring conditions; add lime water to adjust the pH value to 4-4.5, press filter to obtain the primary filtrate and primary filter residue; the rare earth content in the primary filter residue is 0.34%; the primary filtrate and the extraction material liquid mixed to extract rare earth salts;
[0044] (2) The primary filter residue obtained in the step (1) is mixed with water according to the solid-to-liquid ratio of 1000kg: 8m 3 Mixing, under the condition of stirring, carry out secondary water washing at 80 ℃ for 2h; then press filter; obtain secondary filtrate and secondary filter residue; secondary filtrate is refluxed to step (1) as the washing agent for primary water washing; adopt plasma spectrometry The rare earth content in the secondary f...
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