STUDI BIOLEACHING LOGAM TANAH JARANG DARI RED MUD TAYAN, KALIMANTAN BARAT DENGAN MENGGUNAKAN JAMUR PENICILLIUM SP.

• Main Author: Akbar Sighab, Muhammad
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/69185
• Institution: Institut Teknologi Bandung

Bauxite residue or red mud is an alkaline waste from the Bayer process. The need to process red mud is because red mud contains a lot of radioactive elements and is very alkaline so that it can cause various damage to the environment. In addition, red mud contains a complex of oxides of aluminum, iron, titanium, silicon and other valuable components that can be extracted. In this case, biohydrometallurgy is an environmentally friendly approach and requires low energy and costs. In this study, experiments will be conducted on the leaching of rare earth elements (REE) from red mud in Tayan, West Kalimantan. This study begins with the process of comminution, sieving, and sampling. Then, samples of -100# +120#, -120# +140#, -140# +200#, and -200# +270# were analyzed using XRD, XRF, and FTIR. Furthermore, fungal screening was carried out using Aspergillus sp., Penicillium sp., and Rhizopus sp. to obtain the optimum fungus for leaching rare earth elements from red mud. The variations carried out in this study are the bioleaching methods, carbon sources, pulp density, and red mud particle size. Bioleaching was carried out using a gyratory shaker at a constant speed (180 rpm) at room temperature (25 °C) for six days, then samples were taken with a span of 24 hours to be analyzed using ICP-MS. In addition, residual bioleaching results were analyzed using XRD, SEM, and FTIR. The results of ore characterization showed that the dominant oxides in red mud before the bioleaching process were Fe2O3, Al2O3, CaO, dan SiO2. Furthermore, the fungus that produces the highest extraction value was Penicillium sp. with a total rare earth elements extraction value of 9.02 % and the elements with the highest extraction values were Tb (17.35 %), Yb (15.53 %), and Er (7.99 %). In the variation of the bioleaching method, the highest extraction value was obtained using the direct bioleaching method with a total rare earth elements extraction value of 9.12 % and the elements with the highest extraction values were Yb (33.79 %), Tb (13.70 %) and Tm (8.90 %). Moreover, carbon source that produces the highest extraction value was corn starch with a total rare earth elements extraction value of 3.56 % and the elements with the highest extraction value were Yb (7.31 %), Tb (5.66 %), and Tm (4.21 %). In the variation of particle size and pulp density, the highest extraction value was obtained using pulp density of 2 % and particle size of -140# +200# with a total rare earth elements extraction value of 8.35 % and the element with the highest extraction value was Lu (38.46 %), Yb (17.86 %), and Tm (9.87 %).