废荧光粉回收处理技术

含汞废灯管经干式处理可回收荧光粉,近年来灯用荧光粉价格高涨以及其中含有稀土元素,其回收倍受重视.但回收荧光粉其发光强度较新荧光粉低落,本研究探讨可行之回收技术以提升纯度与强度.在提升回收纯度部分,改良式管端切除与纯化技术,回收荧光粉纯度由95.94%提升至99.61%.在提升发光强度部分,使用丙酮清洗,回收荧光粉其发光强度提升29.9%;回收卤磷酸盐荧光粉以醋酸溶液清洗,则发光强度提升19%,而回收三波长荧光粉发光强度提升15%;固态反应法技术,卤磷酸盐荧光粉发光强度提升41%,而回收三波长荧光粉提升12%;水热反应法实验,卤磷酸盐荧光粉发光强度提升54%,而回收三波长荧光粉提升19%.经本研究发现,使用水热反应法处理回收荧光粉,其提升卤磷酸盐及三波长荧光粉之发光强度效果最为显著.

Recycling and treatment technology of waste fluorescent powder

Using dry processing to treat the waste mercury lamps can recycle fluorescent powder.In recent years,the price of lamp fluorescent powder has been rising and since the fluorescent powder contains rare earth elements;its recovery has attracted significant attention.The luminous intensity of recovered fluorescent powder is lower than new ones.This study will discuss how to enhance the purity and luminous intensity with available recycling technologies.To enhance the recovery of purity,using modified tube end resection and purification technologies can increase the purity from 95.94% to 99.61%.To enhance luminous intensity,cleaning recycled fluorescent powder with acetone can increase luminous intensity by 29.9%.By using acetic acid to clean,the luminous intensity of recycled halophosphate fluorescent powder increased by 19%,and recycled three-wavelength fluorescent powder increased by 15%.By using solid state reaction method,the luminous intensity of recycled halophosphate fluorescent powder increased by 41%,and recycled three-wavelength fluorescent powder increased by 12%.By using hydrothermal method,the luminous intensity of recycled halophosphate fluorescent powder increased by 54%,and recycled three-wavelength fluorescent powder increased by 19%.The results of this study,using the hydrothermal method to treat the recovered fluorescent powder has the most pronounced effect of the luminous intensity.