EKSTRAKSI LOGAM TANAH JARANG DARI FLY ASH HASIL PEMBAKARAN BATUBARA DI PLTU SURALAYA DENGAN METODE BIOLEACHING.

• Main Author: T Lumbantobing, Sarinah
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/68598
• Institution: Institut Teknologi Bandung

Currently, the use of rare earth metals is on the rise in various fields, such as the medical field, the renewable energy field, and the advanced technology field. Industrial waste is one of the focuses of research to find alternative sources of rare carth metals that have economic potential. In this study, the extraction of rare carth metals from industrial waste in the form of coal combustion fly ash from Suralaya power plant, Banten was studied by bioleaching method using Alicyclobacillus Jerrooxydans strain SKC / SSA-2 bacteria and Alieyclobacillus sp. strain SKC-23 bacteria in liguid medium Fe broth. A series of experiments were carried out to determine which bacteria can live in an environment that contains a lot of fly ash and is able to dissolve rare earth metal elements present in fly ash. The experiments were carried out with several parameters that were varied, such as variations in fly ash size, percent solid fly ash, medium pH, and the addition of pyrite and measurements of rare carth metal content in bioleaching solution with analisa ICP-MS as well as measuring the Eh and pH values of the leaching solution for 7 days. The results of the characterization of fly ash show that fly ash is dominated by oxides such as SiO2, AbO3, and Fe2O3, with the content of rare carth metal elements that dominate the most is the ce element with a content of 100.4 ppm. Furthermore, in the experiment of bacterial cell adaptation for 3 days of incubation period, bioleaching performance and growth of bacteria Alicyclobacillus ferrooxydans and Alicyclobacillus sp. was the best, where the most optimal bacterial growth time was selected at 50 hours. The highest rare carth metal extraction for fly ash size variation was 16.82”6 Gd obtained in leaching with size (-37 ym #25 ym) within 7 days of leaching where the highest percent of total extraction was found in the roughest size (-88 um “74 jum), where 0.844 of the total REE was successfully dissolved (2,835 mg REE per kg fly ash). For experiments with solid percent variation, the best rare carth metal element extraction was lu element at 28.095, with a total dissolved REE of0.73”4o (as much as 2.4 mg per kgof fly ash) at 599 solid. Experiments using medium plus H2SO4 showed smaller extraction results than experiments using a medium without the addition of H2SO4. Meanwhile, in experiments with the addition of pyrite, it produced a higher percent of extraction than experiments without the addition of pyrite, where the highest percent of extraction was in experiments with the addition of 3 g/l of pyrite which succeeded in extracting Gd metal as much as 41.10Y4o, with the highest percent of extraction obtained at 0.754 (2.53 mg REE per kg of fly ash).