PEUYEUMISASI SAMPAH AS REDUCTANT FOR IRON EXTRACTION OF LATERITE NICKEL ORE LEACHING RESIDUE

• Main Author: Syahendra Sitanggang, Nefri
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/82697
• Institution: Institut Teknologi Bandung

Indonesia is the country with the highest nickel metal mining production in the world. The high number of national nickel production leads to greater nickel leaching residue generated. In addition, household waste in Indonesia is increasing in number every year. Nickel leach residue and household waste have problems related to land requirements and negative impacts on the surrounding environment. Therefore, an effective utilization method is needed in order to reduce the negative impacts arising from nickel leach residues and household waste in Indonesia. This research aims to study the ability of peuyeumisasi sampah (PS) as an alternative reductant in the iron extraction process from nickel leach residue. In this study, nickel leaching residue came from the step-temperature acid leaching (STAL) process owned by PT Hydrotech Metal Indonesia. Meanwhile, the peuyeumisasi sampah was taken from the waste at ITB Ganesha. A series of experiments included the preparation of nickel leaching residue, making peuyeumisasi sampah, initial characterization of nickel leaching residue samples and peuyeumisasi sampah, making nickel leaching residue briquettes with variations in the addition of PS 0%, 20%, and 30%, laboratory scale experiments and analysis of reduction results. Experiments in a muffle furnace was carried out with initial temperature variations of 700°C, 800°C, 900°C, and 1000°C to a final isothermal temperature of 1450°C with a total reduction time of 105 minutes, 95 minutes, 85 minutes, and 75 minutes and a heating rate of 10°C/minute. To analyze the effect of each parameter, the weight of the samples was calculated. The reduced metal was weighed to determine its weight. The reduced metal and slag were then characterized using Scanning Electron Microscope-Energy Dispersive Spectroscopy (SEM-EDS) to determine the elemental and oxide content. The experimental results show that metals are not formed in 0% PS and 30% PS briquettes with an initial reduction temperature of 1000°C. Increasing the initial reduction temperature tends to decrease the weight of metal produced. Increasing the proportion of PS tends to increase the weight of reduced metal and the percent recovery of chromium and decrease the percent recovery of iron and nickel. In this experiment, the iron recovery percentage ranged from 79 .31-95 .3 %, nickel recovery percentage ranged from 72.62-99.99%, and chromium recovery percentage ranged from 3.82-30.39%. Meanwhile, the lowest sulfur content was obtained in the metal in the 20% PS briquette with an initial reduction temperature of 800°C, which was 0.08%.