00000ctm a22000004i 4500 UP-99796217612222143 Buklod 20230215105418.0 m |o d | ta 160905s xx d r |||| u| (iLib)UPD-00259706615 DENGII rda eng DMLUC LG 993.5 2016 M55 C37 Capistrano, Milbert M. author. Effect of tris(catecholato) silicate (TCS) ion concentration in silica carrier microencapsulation (SCME) treatment of Toledo pyrite concentrate for the suppression of pyrite oxidation thesis by Milbert M. Capistrano, Lorenzo T. Cayaban, Joshua Miguel D. Lopez ; Juan Fidel Calaywan, Russell Roy Palmejar, advisers. Quezon City College of Engineering, University of the Philippines Diliman 2016. iii, 41 leaves color illustrations 28 cm text rdacontent unmediated rdamedia volume rdacarrier Thesis (B.S. Mining Engineering)--University of the Philippines Diliman April 2016. Acid mine drainage is produced when pyrite interacts with water and oxygen. This study investigates the suppression of pyrite oxidation by silica carrier microencapsulation technique (SCME). In SCME, catechol (C₆H₆O₂) was used as an organic carrier to introduce silica particles on to the surface of pyrite particles, foming a protective coating. To test the suppression of pyrite oxidation, accelerated weathering was performed to 20 g pyrite treated with 0 mM, 0.5 mM, 1 mM, 5 mM, 10 mM and 50 mM tris (catecholato) silicate (TCS) solution. The parameters observed were pH and electrical conductivity over a period of 5 days and the final Fe concentration. Statistical analysis of pH, EC and Fe concentration using one-way ANOVA with blocking and Dunnett's t-test showed that differences between the control, 0.5 mM, and 1 mM treatments are found to be insignificant: 5 mM, 10 mM, and 50 mM treatments has a direct correlation between pH and TCS concentration, and inverse correlations between EC and Fe concentration, and TCS concentration. SEM-EDX analysis also shows buildup of silica on pyrite surface. It can be concluded that SCME at 5, 10 and 50 mM treatments reduced pyrite oxidation of a 20g pyrite sample. Acid mine drainage. Pyrites Oxidation. Microencapsulation. Cayaban, Lorenzo T. author. Lopez, Joshua Miguel D. author. Calaywan, Juan Fidel B. adviser. Palmejar, Russell Roy adviser. Thesis FI UP UPD DENG-II LG 993.5 2016 M55 C37 Thesis