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首页> 外文期刊>Separation and Purification Technology >Feasibility of an efficient recovery of rare earth-activated phosphors from waste fluorescent lamps through dense-medium centrifugation
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Feasibility of an efficient recovery of rare earth-activated phosphors from waste fluorescent lamps through dense-medium centrifugation

机译：通过密集介质离心从废荧光灯中有效回收稀土活化磷的可行性

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摘要

Experiments were carried out with waste phosphors collected during the recycling of end-of-life fluorescent lamps to obtain a highly enriched phosphors product as starting material for the better extraction of rare earth elements.The aim of this work was therefore to separate low-density calcium halo-phosphate phosphors from high-density rare earth-activated phosphors through dense-medium centrifugation (with di-iodomethane as organic dense-medium).The feasibility of the process and the conditions for a good separation (higher Newton's efficiency) appear to be a function of the rotation speed of the centrifugal separator,the pulp concentration and the adsorption of a surfactant (sodium oleate,NaOl) during the pre-treatment stage.The effect of the centrifugation time was less pronounced.Through this study,a sink product assaying 48.61% of rare earth-activated phosphors could be recovered from waste phosphor materials pre-treated with 5 x 10~(-5) mol/dm~3 of sodium oleate (NaOl) surfactant.The Newton's efficiency and recovery of the separation were 0.84 and 97.34%,respectively.The process feasibility was reinforced by the possibility to recover,through laboratory batch tests,more than 99.8% of the di-iodomethane (CH_2I_2).
机译：使用报废的荧光灯回收过程中收集的废磷光体进行了实验，以获得高浓度的磷光体产品作为更好地萃取稀土元素的原料，因此这项工作的目的是分离低密度的磷光体。高密度稀土活化磷光体通过中等密度离心（以二碘甲烷作为有机高密度介质）从卤代磷酸钙磷光体中发现。该方法的可行性和良好分离条件（牛顿效率更高）看来与离心分离机的转速，预处理过程中纸浆浓度和表面活性剂（油酸钠，NaOl）的吸附有关。离心时间的影响不太明显。产品分析可从用5 x 10〜（-5）mol / dm〜3油酸钠（NaOl）表面处理剂预处理的废磷光粉材料中回收48.61％的稀土活化磷光粉nt。牛顿分离效率和回收率分别为0.84和97.34％。通过实验室分批测试回收99.8％以上的二碘甲烷（CH_2I_2）的可能性，增强了工艺可行性。

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