MINERAL WASTE STABILIZATION THROUGH GEOPOLIMERIZATION

• Main Author: Bryan Cheon, Jonathan
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/48119
• Institution: Institut Teknologi Bandung

Indonesia as a developing country with an economic growth of 5.07% is currently intensifying its infrastructure and industrial development. Infrastructure development has problems in the Portland cement industry which contributes in producing CO2 emission of a total 5% from total global CO2 emission. Industries cause a serious problem in the environment, especially mineral industry in Indonesia which has a lot of hazardous and toxic waste. Therefore, a solution for environmentally friendly construction material is needed in infrastructure and industrial development. The stabilization process of hazardous and toxic waste can be done by making construction materials through geopolymerization reaction of alumina-silicate materials that have the potential to replace the use of Portland cement. The purpose of this study is to study he stabilization of mineral waste aims to reduce the content of dissolved chromium heavy metals in the landfilling process. Mineral waste stabilization intents to reduce the the potential of toxic and hazardous waste content. The aim of this study is to determine the effectiveness of geopolymerization in stabilizing mineral waste, optimum compressive strength of the resulting geopolymer, and geopolymer characteristics of compressive strength and stabilization of mineral waste. The raw materials used in this study are fly ash and slag. The raw material preparation phase consists of grinding and sieving of each mineral waste and XRF analysis to determine the chemical composition of raw materials. Geopolymer paste is formed by mixing precursor and sand with activator solution of NaOH and water glass (Na2SiO3) and then stored at curing temperature of 60oC for 24 hours in the oven. The results showed that geopolymers with coal fly ash precursors could reach optimum compressive strength of 34.32 MPa and chromium immobilization at 0.3005 mg/L. XRD and SEM-EDS tests on various geopolymer samples show the characteristics of the geopolymerization reaction.