Method for recovering rare earth from waste rare earth luminescent material
A rare earth luminescent, waste technology, applied in the direction of luminescent materials, lamp/lamp material recycling, electronic waste recycling, etc., can solve problems such as mercury pollution, removal of Al impurity elements, etc., to solve environmental pollution, high recovery rate, protection The effect of the environment
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[0054] Example 1
[0055] Discarded fluorescent lamps and CRT monitors are disassembled and broken, and mercury vapor is collected under negative pressure. The concentration of waste phosphor is 20 wt % Acetone solution for cleaning, using 0.8g / L potassium permanganate for oxidative mercury removal for 4h, zinc sulfide addition of 0.8g / L cleaning solution, precipitation of Hg by sulfurization 2+ , Finally, the residual mercury in the phosphor is removed by activated carbon.
[0056] Mix the cleaned waste rare earth luminescent material with alkali (NaOH) and stir evenly, add water according to the mass ratio of 1:6 and stir evenly, then the alkali fusion product obtained after alkali fusion at 800°C for 1 hour, wash with secondary deionized water Removal of remaining NaOH and part of NaAlO 2 Obtain rare earth-containing insoluble matter. Use 6mol / L hydrochloric acid for acid hydrolysis at 70°C for 2 hours, the solid-liquid ratio of insoluble matter to hydrochloric acid is 1:10, t...
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[0063] Example 2
[0064] Discarded fluorescent lamps and CRT monitors are disassembled and broken, and mercury vapor is collected under negative pressure. The concentration of used phosphor is 30 wt % Acetone solution is cleaned, and the concentration of 1g / L potassium permanganate is used for oxidative mercury removal for 5 hours to remove residual mercury in the phosphor.
[0065] Mix the cleaned waste rare earth luminescent material with alkali (KOH) and stir evenly, add water according to the mass ratio of 1:10 and stir evenly, and then the alkali fusion product obtained after alkali fusion at 1000 ℃ for 3 hours, wash with secondary deionized water Removal of remaining KOH and part of KAlO 2 Obtain rare earth-containing insoluble matter. Use 8mol / L hydrochloric acid for acid hydrolysis at 60°C for 4 hours, the solid-liquid ratio of insoluble matter to hydrochloric acid is 1:3, the acid hydrolysis solution is adjusted to pH 4 with ammonia water, and 5 is added wt % PAC floccu...
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[0072] Example 3
[0073] Discarded fluorescent lamps and CRT monitors are disassembled and broken, and mercury vapor is collected under negative pressure. The concentration of used phosphor is 10 wt % Acetone solution is cleaned, and the concentration of 0.2g / L potassium permanganate is used for oxidative mercury removal for 0.5h to remove residual mercury in the phosphor.
[0074] Mix the cleaned waste rare earth luminescent materials with alkali (NaOH) and stir evenly, add water according to the mass ratio of 1:2 and stir evenly, then alkali fusion at 1200℃ for 5 hours to obtain the alkali fusion product, wash with secondary deionized water Removal of remaining NaOH and part of NaAlO 2 Obtain rare earth-containing insoluble matter. Use 3mol / L hydrochloric acid for acid hydrolysis at 80℃ for 6 hours, the solid-liquid ratio of insoluble matter to hydrochloric acid is 1:5, the acid hydrolysis solution is adjusted to pH 5 with ammonia water, and 2 is added wt % PAC flocculant to r...
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