Floatability of rare earth phosphors from waste fluorescent lamps
Floatability of rare earth phosphors from waste fluorescent lamps
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DOI：
10.1016/j.minpro.2005.05.002
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发表时间：
2005-12-01
影响因子：
--
通讯作者：
Tsunekawa, M
中科院分区：
文献类型：
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作者：
Hirajima, T;Bissombolo, A;Tsunekawa, M
进行Zeta电位测量以确定磷光体材料的电状态，在此基础上，可以进行浮选在从废荧光灯中回收细粒（d50 < 13 gm）稀土磷光体中使用的可行性研究。用白色（卤代磷酸钙）、红色、绿色和蓝色（稀土）磷光体的纯样品进行测试，它们的混合物的比例为17：1：1：1，并且用实际的废磷光体材料进行测试。考察了在不同pH范围内，阳离子捕收剂（十二烷基乙酸铵）和阴离子捕收剂（十二烷基硫酸钠和油酸钠）对物料可浮性的影响，以及分散剂Na 2SiO 3对分离性能的影响。该工艺应用于实际废弃的废荧光粉，在两阶段分离方案中，DAA和SDS浮选的沉降产物分别含有17.7-23.8%和21.5-25.9%的稀土荧光粉。DAA和SDS浮选回收率分别为70-90%和66-82%，牛顿效率分别为0.26-0.37和0.18-0.20。(c)2005 Elsevier B. V.保留所有权利。
Zeta-potential measurements were made to determine the electric state of phosphor materials on the basis of which a feasibility study could be performed for the use of flotation in the recovery of fine (d50 < 13 gm) rare earth phosphors from waste fluorescent lamps. Tests were carried out with pure specimens of white (calcium halo-phosphate), red, green and blue (rare earth) phosphors, with a 17: 1 : 1 : I ratio of their mixture, and with actual waste phosphor materials. The effects of a cationic (dodecyl ammonium acetate, DAA) and two anionic (sodium dodecyl sulfate (SDS) and sodium oleate (NaOl)) collectors on the floatability of materials, as well as that of Na2SiO3 dispersant on the separation characteristics, were investigated at different pH ranges. The process, applied to actual discarded waste phosphors gave, in a two-stage separation scheme, sink products assaying 17.7-23.8% and 21.5-25.9% rare earth phosphors for DAA and SDS flotation, respectively. The recovery and Newton's efficiency were about 70-90% and 0.26-0.37, 66-82% and 0.18-0.20, respectively for DAA and SDS flotation. (c) 2005 Elsevier B.V. All rights reserved.