00000ctm a22000004i 4500 UP-99796217612829764 Buklod 20230215105418.0 m |o d | ta 180823s xx d r |||| u| (iLib)UPD-00367512417 DENGII rda eng DMLUC LG 996 2018 E653 S37 Sapitan, Jhomee Fe F. author. Recovery of rare-earth metals (yttrium and europium) from waste computer monitor backlight utilizing NaCL in the leaching process a dissertation by Jhomee Fe (Jaja) F. Sapitan ; Florencio C. Ballesteros Jr., dissertation adviser ; Sergio C. Capareda, dissertation co-adviser. Quezon City College of Engineering, University of the Philippines Diliman 2018. xiv, 80 leaves illustrations (some color) 28 cm text rdacontent unmediated rdamedia volume rdacarrier Thesis (Doctor of Philosophy in Environmental Engineering)--University of the Philippines Diliman June 2018. F - no patentable invention or creation, not for personal publication and no confidential information. Yes - available to the general public. With continuous demand due to shift in clean energy technologies and projected growth in power and transportation sectors across the globe, and limited resources, finding for secondary sources of this critical raw material is timely and essential. Among the extensively studied secondary sources include recovering REMS from waste lamp phosphors and batteries. However, there is still no separation and purification process on recovery of REMS from LCD backlights. This paper aimed to develop a hydrometallurgical process that recover rare-earth metals from waste computer monitor backlights utilizing NaCl in the leaching process. The series of treatment proven effective in rare-earth metal recovery are leaching, precipitation and calcination. In leaching, the highest efficiency was achieved when the parameters used were HC1:NaC1 = 1:1, solid to liquid = 10g/ml, chloride ions molarity = 0.5M and stirring rate = 300 rpm. With this condition, 97.3508% of yttrium is recovered while for 81.2311% for europium. Furthermore, the kinetic model representing the leaching of Y and Eu are surface chemical reaction control and product layer diffusion control, respectively. The REM in the liquid lixiviant is recovered through precipitation using NaCO3. Subsequently, the precipitate was calcined at 1123K to further remove impurities. From the initial 1.20% Y in the powdered backlight, it was recovered and purified to 66.29% as yttrium oxide. This was further confirmed by the diffraction peaks from XRD analysis. Electronic waste Recycling. Rare earth metals. Leaching. Ballesteros, Florencio C. Jr. adviser. Capareda, Sergio C. co-adviser. Thesis FI UP UPD DENG-II LG 996 2018 E653 S37 Thesis